Arduino Help | Rust Programming Language Community | Page 5

coral geyser Aug 3, 2022, 6:21 AM

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Then explore more

wary cloak Aug 3, 2022, 6:21 AM

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But well that's more or less my plan of I'mma learn this then that then I will he comfortable enough to stop jumping from languages

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And actually do something

coral geyser Aug 3, 2022, 6:22 AM

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nothing wrong with that (as long as you are not neglecting other things)

wary cloak Aug 3, 2022, 6:23 AM

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Tho I liked studying electronics to some extent and I seem to have a thing for embedded systems, low level

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I mean I feel so excited to buy the raspberry Pi pico for some reason

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But also seeing the app made in rust and so thought hey maybe this is fun but I have to learn other stuff before

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There's no project in particular I feel like doing

coral geyser Aug 3, 2022, 6:24 AM

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wary cloak Tho I liked studying electronics to some extent and I seem to have a thing for e...

Embedded is very fun. That's why I am a computer engineer. Mixing electronics and software is just ferrisChefKiss

wary cloak Aug 3, 2022, 6:24 AM

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And if we speaking of embedded projects

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I can't afford them.

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I saw a nixie tubes clock project and thought

coral geyser Aug 3, 2022, 6:24 AM

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wary cloak I can't afford them.

yeah, that's the downside sadly

wary cloak Aug 3, 2022, 6:25 AM

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Yeah it would be really cool to do that

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And then he started listing prices

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And well

coral geyser Aug 3, 2022, 6:26 AM

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wary cloak There's no project in particular I feel like doing

My go to project for people without projects is a NES emulator

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2 reactions: Thats to complicated, that sounds interesting

wary cloak Aug 3, 2022, 6:26 AM

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coral geyser Embedded is very fun. That's why I am a computer engineer. Mixing electronics an...

Here I will do engineer in systems or smth like that because it's the only career that has programming I know aside from computer scientists but I think maybe cs it's not what I want to do so

wary cloak Aug 3, 2022, 6:26 AM

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coral geyser 2 reactions: Thats to complicated, that sounds interesting

I never played the nes so .. .

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I wanted before to do a WhatsApp bot

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But know I wouldn't have use for it

coral geyser Aug 3, 2022, 6:27 AM

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wary cloak I never played the nes so .. .

Emulators are fun because it's electronics, but in software

wary cloak Aug 3, 2022, 6:29 AM

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Well tomorrow we could talk also about stuff like that I would really like to say I wanna program this and focus on that so I get good I use what I learn and not that far in the future I would know enough to do it alone or even earn money from it

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I way wanna try doing apps or webs with rust and I think tauri or dino that made my backend web assembly idk

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I really need to know HTML css and js

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Tho I heard css it's a enormous pain

coral geyser Aug 3, 2022, 6:30 AM

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coral geyser My go to project for people without projects is a NES emulator

custom!{Jsr, {Absolute, cpu, 
    _0, cpu.read_next(),
    _1, {cpu.store_to_temp(); cpu.read_from(cpu.stack())},
    _2, {
        cpu.write_to(cpu.stack(), (((cpu.internal.pc + 1) >> 8) & 0xFF) as u8);
        cpu.internal.s = cpu.internal.s.wrapping_sub(1);
    }, 
    _3, {
        cpu.write_to(cpu.stack(), ((cpu.internal.pc + 1) & 0xFF) as u8);
        cpu.internal.s = cpu.internal.s.wrapping_sub(1);
    },
    _4, cpu.read_next(),
    _5, {
        cpu.fetch_next_from(cpu.calc_address())
    }
}}

My really bad macro for my NES emulator that is half put together ferrisballSweat

coral geyser Aug 3, 2022, 6:30 AM

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wary cloak Tho I heard css it's a enormous pain

it can be, depends on what you are doing

wary cloak Aug 3, 2022, 6:31 AM

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I want to use rust in the other stuff

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It would be could if I had something I said

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Hey it wouod come in handy

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Or smth

coral geyser Aug 3, 2022, 6:31 AM

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yep

wary cloak Aug 3, 2022, 6:31 AM

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As I said idk like programming a bot

coral geyser Aug 3, 2022, 6:31 AM

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Its 12:31 ferrisballSweat

wary cloak Aug 3, 2022, 6:32 AM

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Pff

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It's 3:32 and I have school (?

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I will go to sleep because I should've some hours ago

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I will mention that

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We are really close to the

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First milestone

coral geyser Aug 3, 2022, 6:33 AM

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Sleep!

wary cloak Aug 3, 2022, 6:33 AM

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That is getting the base functionality of the project and getting to last component in the current state of the project (it isn't like there will be much more)

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Lcd is just left two stuff

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And the other two stuff as I stated it should be easy

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Actually maybe

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When we get to the keyboard (tomorrow I hope)

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Take me to process of finding the library in crate. Io

coral geyser Aug 3, 2022, 6:34 AM

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(I love how Lux keeps popping into the discussion but doesn't say anything ferrisHmm )

wary cloak Aug 3, 2022, 6:34 AM

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Lux: ferrogus

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Ah and idk if you plc I guess you likely do

old mango Aug 3, 2022, 6:35 AM

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Nah i was gonna give some impressions of webdev in rust but i am slow to type and the discussion moved too quickly

wary cloak Aug 3, 2022, 6:36 AM

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I also loved that when I saw it and did ladder, I enjoyed ladder reaaaally much and I thought of landing a first job in an offer I saw of looking for technician in electronics, no experience, desired c/c++ knowledge and they were a plc company or I would basically work with them idk

wary cloak Aug 3, 2022, 6:37 AM

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old mango Nah i was gonna give some impressions of webdev in rust but i am slow to type an...

Say it, tho I know nothing of web development yet(?

coral geyser Aug 3, 2022, 6:37 AM

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wary cloak Ah and idk if you plc I guess you likely do

plc?

wary cloak Aug 3, 2022, 6:37 AM

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coral geyser plc?

Tomorrow we gotta talk about it(?

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Now it's too late to right my usual Bible

coral geyser Aug 3, 2022, 6:38 AM

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Sleep 💤

wary cloak Aug 3, 2022, 6:39 AM

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After lux impression ima go sleep

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Well since I will only have 4 hours of sleep I better go now and read it tomorrow- anyways no one else writes here, guten natch

old mango Aug 3, 2022, 6:46 AM

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rust is strong as a server language, with a lot of powerful library/framework options
on the client side, it's not quite as mature yet; if you're using it to do heavy lifting for computing it's good, or if you're using it for a game that's decently supported; if you're using it for UI (e.g. (v)DOM manipulation), then there are usable options (yew is the big one here, afaict), but said options aren't at the point where they're production-ready yet.
Another note, that may or may not be relevant depending on your prior experiences/expectations, is that rust's compile times mean that your iteration cycle (how long it takes to change code -> compile code -> see results -> repeat) is limited to the speed at which your project compiles, which can be painful as project size grows, especially for lower-spec computers, compared to for example javascript, php, python, whatevs, that are interpreted (although js build tools are a whole hassle of their own)
Anyway, that's my little spiel; not sure if anything there is useful but just explore! what you're interested in

old mango Aug 3, 2022, 6:47 AM

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wary cloak Well since I will only have 4 hours of sleep I better go now and read it tomorro...

Oh my days, sleep!

wary cloak Aug 3, 2022, 5:17 PM

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@coral geyser it didn't work :(

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Idk why

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I don't know what link.exe it's and where it may be

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Ans gat of visual c++ option maybe is something we forgot the fact the rust needed some tool fr c++ or smth like that

wary cloak Aug 3, 2022, 9:30 PM

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PS C:\Users\Taller03> cd
PS C:\Users\Taller03> cd D:\
PS D:\> cd rust_toolchain
PS D:\rust_toolchain> .\busybox.exe ash setup_rust_arduino.sh
Directory of rust toolchain: D:/rust_toolchain
Starting configured ash shell, run 'exit' to exit the shell.
D:/rust_toolchain $ cd ..
D:/ $ cd rust_lcd
D:/rust_lcd $ cargo check
   Compiling compiler_builtins v0.1.73
   Compiling core v0.0.0 (D:\rust_toolchain\.rustup\toolchains\nightly-2022-06-13-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core)
   Compiling proc-macro2 v1.0.42
   Compiling rustversion v1.0.8
   Compiling quote v1.0.20
   Compiling unicode-ident v1.0.2
   Compiling semver-parser v0.7.0
   Compiling syn v1.0.98
error: linker `link.exe` not found
  |
  = note: program not found

note: the msvc targets depend on the msvc linker but `link.exe` was not found

note: please ensure that VS 2013, VS 2015, VS 2017, VS 2019 or VS 2022 was installed with the Visual C++ option

error: could not compile `proc-macro2` due to previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `compiler_builtins` due to previous error
error: could not compile `quote` due to previous error
error: could not compile `syn` due to previous error
error: could not compile `rustversion` due to previous error
D:/rust_lcd $

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Just in case

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I copied the error to text

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I'm finally home btw

coral geyser Aug 3, 2022, 9:31 PM

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Oh, the proc macros needed to be recompiled. I forgot about those ones

wary cloak Aug 3, 2022, 9:31 PM

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Well after me having tea time and all

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Based on this error

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We can now make it work

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Tho this was a borrowed pendrive, now I kinda have one that can be mine so

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I will do that all over but knowing what to do so anyways I want to do it to this one that already has the other stuff

coral geyser Aug 3, 2022, 9:38 PM

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What you will need is a copy of cygwin with gcc on the USB drive. That will replace the Microsoft build tools

wary cloak Aug 3, 2022, 9:39 PM

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.. .

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We better see it with the computer then and all because no clue

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But does this have to do with C++ built tools?

coral geyser Aug 3, 2022, 9:40 PM

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wary cloak But does this have to do with C++ built tools?

Yeah, when rustc is compiling code there can be proc macros that are compiled and run during the compilation. It failed because it couldn't build those proc macros

wary cloak Aug 3, 2022, 10:08 PM

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In some minutes I'm available to do it if you are

wary cloak Aug 3, 2022, 10:44 PM

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Ok I'm back @coral geyser are you?

wary cloak Aug 4, 2022, 7:39 PM

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I have good news about the project, it finally has a Max limit

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Up until know I would finish doing what I was supposed to do and he will tell ok how about this know

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now*

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But now, finally there's a limit when I do up until a point and it's finally done

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And it isn't that far away

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After RFID, two sensors which I could guess they are easy to work with and it's done

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And finally I can move on do other stuff without a time limit or stuff

wary cloak Aug 4, 2022, 9:51 PM

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@coral geyser are you available? Or later ofc also

coral geyser Aug 4, 2022, 9:58 PM

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wary cloak <@332239026893357058> are you available? Or later ofc also

Yeah I have some time

wary cloak Aug 4, 2022, 9:58 PM

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Today i have again the python class

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Today we finally use vs code

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Well anyways so

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The idea is the following

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We add what's missing to the usb

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But more so because so I know what I need there

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Because actually I have to move all again to another pendrive but, I would know the steps so I wouod do it alone when I need to

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And then we'll finish the lcd

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And if my chance the lcd didn't took long go to the matricial keyboard

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Well I'mma go to the bathroom and turn on the computer

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Ok done

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And I plugged in the usb

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What's left to get to the USB?

coral geyser Aug 4, 2022, 10:14 PM

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wary cloak What's left to get to the USB?

Download https://www.cygwin.com/ we will use it to get a replacement for link.exe

wary cloak Aug 4, 2022, 10:15 PM

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Sure

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But where did my computer got it from(?

coral geyser Aug 4, 2022, 10:15 PM

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wary cloak But where did my computer got it from(?

When you installed rust you had to install the Microsoft build tools right?

wary cloak Aug 4, 2022, 10:16 PM

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Ah yeah Likely

coral geyser Aug 4, 2022, 10:16 PM

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Its in that

wary cloak Aug 4, 2022, 10:16 PM

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Where (?

coral geyser Aug 4, 2022, 10:16 PM

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But that one requires admin privileges to install

wary cloak Aug 4, 2022, 10:16 PM

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Oh

coral geyser Aug 4, 2022, 10:17 PM

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wary cloak

Installing Cygwin: setup-x86_64.exe

wary cloak Aug 4, 2022, 10:17 PM

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So then I go to downloads and get it to the usb?

coral geyser Aug 4, 2022, 10:18 PM

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Yeah

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Then once it is on the USB run it

wary cloak Aug 4, 2022, 10:19 PM

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There or in tool chain?

coral geyser Aug 4, 2022, 10:19 PM

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wary cloak There or in tool chain?

There is fine

wary cloak Aug 4, 2022, 10:19 PM

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So it click on it run it?

coral geyser Aug 4, 2022, 10:19 PM

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Yep

wary cloak Aug 4, 2022, 10:20 PM

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Sure that will do it to the usb and not my computer only?

coral geyser Aug 4, 2022, 10:20 PM

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wary cloak Sure that will do it to the usb and not my computer only?

When the install window pops up you will be able to set where to install it to

wary cloak Aug 4, 2022, 10:20 PM

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That one?

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Because I only clicked yes-

coral geyser Aug 4, 2022, 10:21 PM

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Click yes, then you should get another window

wary cloak Aug 4, 2022, 10:21 PM

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Yes I did

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There?

coral geyser Aug 4, 2022, 10:22 PM

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wary cloak Aug 4, 2022, 10:22 PM

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Next?

coral geyser Aug 4, 2022, 10:23 PM

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set it up like this

wary cloak Aug 4, 2022, 10:24 PM

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So F instead of C, eliminate 64 and just mr

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me*

coral geyser Aug 4, 2022, 10:24 PM

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yep, F should be the letter of the USB drive

wary cloak Aug 4, 2022, 10:24 PM

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I think it's C tho

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Because I remember I had to copy the path once

coral geyser Aug 4, 2022, 10:25 PM

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C should be your main hard drive

wary cloak Aug 4, 2022, 10:25 PM

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Let me do it again just in case

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Ah it wasn't C but D

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D:\

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I do that one?

coral geyser Aug 4, 2022, 10:26 PM

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yep

wary cloak Aug 4, 2022, 10:26 PM

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Next?

coral geyser Aug 4, 2022, 10:27 PM

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don't forget to add the folder name cygwin to the end

wary cloak Aug 4, 2022, 10:27 PM

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D:\Cygwin?

coral geyser Aug 4, 2022, 10:27 PM

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yep

wary cloak Aug 4, 2022, 10:28 PM

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coral geyser don't forget to add the folder name cygwin to the end

oh without capital?

coral geyser Aug 4, 2022, 10:28 PM

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it shouldn't matter

wary cloak Aug 4, 2022, 10:28 PM

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coral geyser Aug 4, 2022, 10:29 PM

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wary cloak Aug 4, 2022, 10:29 PM

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coral geyser Aug 4, 2022, 10:30 PM

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oh, wait. pause we may not need to do this one second to let me check

wary cloak Aug 4, 2022, 10:30 PM

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Ok

wary cloak Aug 4, 2022, 10:46 PM

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in the meantime I'm suspending the equipment, just in case

coral geyser Aug 4, 2022, 11:13 PM

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Alright I think I figured out how to do it

wary cloak Aug 4, 2022, 11:26 PM

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Oh

wary cloak Aug 4, 2022, 11:26 PM

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coral geyser Alright I think I figured out how to do it

How?

coral geyser Aug 4, 2022, 11:31 PM

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ferrisSob why!?!?!?

wary cloak Aug 4, 2022, 11:32 PM

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Sometimes it just doesn't feel like importing(?

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But

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Do I back on what I was doing and delete all that just now?

coral geyser Aug 4, 2022, 11:39 PM

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coral geyser <:ferrisSob:586979927430135818> why!?!?!?

I have no idea how to fix this error

wary cloak Aug 4, 2022, 11:39 PM

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Maybe we could ask for help?

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We have time until Wednesday maybe we should give it a rest and go back to the code for now since we have almost a week if not

coral geyser Aug 4, 2022, 11:42 PM

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... i think maybe ... I figured it out

wary cloak Aug 4, 2022, 11:42 PM

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Tho it's a shame we can't properly test it

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Because last time we supposedly did but, it has to be on another computer definitively

coral geyser Aug 4, 2022, 11:43 PM

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it did the thing

wary cloak Aug 4, 2022, 11:43 PM

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Perfect

coral geyser Aug 4, 2022, 11:43 PM

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https://book.avr-rust.com/003.2-note-about-rust-build-std-flag.html

A note about the required Rust -Z build-std=<CRATE,> flag - The AVR...

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I had the options wrong on the core rebuild

wary cloak Aug 4, 2022, 11:44 PM

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Oh I need to go to eat and not so late after go to class tho in the middle or maybe during it we could do it

wary cloak Aug 4, 2022, 11:44 PM

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coral geyser https://book.avr-rust.com/003.2-note-about-rust-build-std-flag.html

I download this..?

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Leave me the steps just in case (!

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(? *

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Hope to see you real soon

coral geyser Aug 4, 2022, 11:44 PM

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wary cloak I download this..?

nah, we need to change a few config files

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first, we edit rust_toolchain/.rustup/settings.toml to be

default_host_triple = "x86_64-pc-windows-gnu"
default_toolchain = "nightly-2022-06-13-x86_64-pc-windows-gnu"
profile = "minimal"
version = "12"

[overrides]

this will switch to the gnu toolchain which doesn't need the link.exe

wary cloak Aug 4, 2022, 11:47 PM

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So link.exe wasn't actually needed?

coral geyser Aug 4, 2022, 11:47 PM

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wary cloak So link.exe wasn't actually needed?

the default toolchain msvc uses link.exe, the gnu one uses it's own

coral geyser Aug 4, 2022, 11:49 PM

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coral geyser first, we edit rust_toolchain/.rustup/settings.toml to be ```toml default_host_t...

then we run cargo check and it should just work

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Though we will probably need to move around some of the files to get the toolchain to actually install

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oh, we do need to change PATH in the rust_toolchain/setup_rust_arduino.sh to

export PATH="$dir_path/.cargo/bin:$dir_path/avr/bin:$dir_path/.rustup/toolchains/nightly-2022-06-13-x86_64-pc-windows-gnu/bin"

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and delete rust_toolchain/.cargo/bin/cargo.exe

wary cloak Aug 5, 2022, 12:13 AM

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Ah...

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I understood too little so we will have to go through this slowly-

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My class it's like 7 minutes away but

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What would be the first step?

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I already deleted

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That thing we were doing

wary cloak Aug 5, 2022, 12:26 AM

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coral geyser first, we edit rust_toolchain/.rustup/settings.toml to be ```toml default_host_t...

There's not toml settings

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What it didn't took a picture

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There

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Pendrive tool chain, rust up but the other isn't there

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Oh..

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Ik

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It's settings just that it's a .toml but windows doesn't say it, right?

coral geyser Aug 5, 2022, 12:29 AM

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wary cloak It's settings just that it's a .toml but windows doesn't say it, right?

yeah

wary cloak Aug 5, 2022, 12:30 AM

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#

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PS C:\Users\fuchi> cargo check
error: could not find Cargo.toml in C:\Users\fuchi or any parent directory
PS C:\Users\fuchi>

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Cargo check failed

coral geyser Aug 5, 2022, 12:32 AM

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wary cloak PS C:\Users\fuchi> cargo check error: could not find `Cargo.toml` in `C:\Users\f...

you need to run it inside of the shell setup_rust_arduino.sh makes

wary cloak Aug 5, 2022, 12:32 AM

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..

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How (?

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Oh so

wary cloak Aug 5, 2022, 12:33 AM

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wary cloak

I still do this

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But the cargo check is run somewhere else

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Right?

coral geyser Aug 5, 2022, 12:35 AM

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busybox.exe ash setup_rust_arduino.sh

wary cloak Aug 5, 2022, 12:35 AM

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If I stop talking at any moment the class just started in two hour maximum I'm back

wary cloak Aug 5, 2022, 12:35 AM

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coral geyser busybox.exe ash setup_rust_arduino.sh

Oh so I do that and run cargo check on the script you did?

coral geyser Aug 5, 2022, 12:37 AM

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yep

wary cloak Aug 5, 2022, 12:40 AM

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And that would be the last step or we so something later?

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Idk why I already feel nostalgic about "rust_beginners" (?

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Tho I still belong there ig

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I hope to in the future be the one that helps newcomers there

coral geyser Aug 5, 2022, 12:54 AM

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wary cloak And that would be the last step or we so something later?

That depends on if it works or not

wary cloak Aug 5, 2022, 12:58 AM

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Right

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After the class I'll try it or in the middle of the break

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Btw I was kinda thinking..

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If I'm still doing that function on the lcd

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I mean

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The Arduino one needed it

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To be more tidy

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This one is as God damn tidy and encapsulated as it can get so, does it needed?

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I would just add a new state and function to execute in that state

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Tho

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I we still in that function have to print stuff with the lcd manually, but isn't it that much of a problem really?

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And also a function that just calls another and anything else seems useless

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Idk

wary cloak Aug 5, 2022, 2:48 AM

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Class is over

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I'm doing the thing now

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Taking it's time.

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Oh yes

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Errors

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Ofc

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Maybe just maybe

wary cloak Aug 5, 2022, 3:02 AM

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coral geyser oh, we do need to change `PATH` in the rust_toolchain/setup_rust_arduino.sh to `...

It's because I didn't do this

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Because I didn't understand

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Let me see if I understand

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Delete this?

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And then

coral geyser Aug 5, 2022, 3:05 AM

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wary cloak

yeah delete that

wary cloak Aug 5, 2022, 3:05 AM

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Run that?

coral geyser Aug 5, 2022, 3:06 AM

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wary cloak

put it in the setup_rust_arduino.sh script

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you can open it in vscode

wary cloak Aug 5, 2022, 3:07 AM

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coral geyser put it in the setup_rust_arduino.sh script

How?

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Cd into it or smth?

coral geyser Aug 5, 2022, 3:08 AM

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wary cloak How?

open vscode, go to file -> open, browse to the usb drive then rust_toolchain then open the setup_rust_arduino.sh file

wary cloak Aug 5, 2022, 3:10 AM

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wary cloak Aug 5, 2022, 3:10 AM

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coral geyser oh, we do need to change `PATH` in the rust_toolchain/setup_rust_arduino.sh to `...

I delete all that and copy this?

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Oh or I change only

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export PATH="$dir_path/.cargo/bin:$dir_path/avr/bin"

wary cloak Aug 5, 2022, 3:13 AM

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coral geyser oh, we do need to change `PATH` in the rust_toolchain/setup_rust_arduino.sh to `...

To that

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Like that?

coral geyser Aug 5, 2022, 3:16 AM

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wary cloak

yep

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make sure to save it

wary cloak Aug 5, 2022, 3:17 AM

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Now finally cargo build?

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In the PowerShell again

coral geyser Aug 5, 2022, 3:17 AM

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now open a new instance of setup_rust_arduino.sh (either exit and then rerun the command, or run it in a new powershell)

wary cloak Aug 5, 2022, 3:17 AM

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Let me see if I understood

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Close powers shell, open it and run again cargo build?

coral geyser Aug 5, 2022, 3:19 AM

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open a new powershell in the rust_toolchain folder. then run busybox.exe ash setup_rust_arduino.sh then cd ../[project]

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then cargo --version --verbose

wary cloak Aug 5, 2022, 3:20 AM

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With project you mean cd. . And then cd rust_lcd(?

coral geyser Aug 5, 2022, 3:22 AM

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wary cloak With project you mean cd. . And then cd rust_lcd(?

yes

wary cloak Aug 5, 2022, 3:22 AM

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coral geyser Aug 5, 2022, 3:23 AM

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wary cloak

okay now do a cargo check

wary cloak Aug 5, 2022, 3:23 AM

#

Taking it's time

#

In the meantime

#

In class

#

I got REALLY

#

Frustrated

#

We finally use vs code

#

I created a folder in documentos next thw the rust one

#

Open it and create files to do the exercises and so

#

But constantly got errors of no such file or directory

#

I don't even know

#

How I got the first to work

#

Python aprobados.py

#

But the other exercise

#

That was in a new folder and I needed to create a module an import it

#

To another file and use it

#

I had this error again

#

I just can't fix it the code works if I use the button run it works

#

But I shouldn't have too

#

Also if I do a little part specification it works

#

And I really want to fix that so I can keep track of the class and actually I have an exercise to do

#

I will show you the screen shot of say the layout

#

The error

#

And what's the minimum I need to write in order for it to work

#

And thanks to that frustration I didn't pay full attention to the class -

#

It's just when I get left behind I didn't understand something prior or I couldn't do it because my pc is slow as fuck or stuff

#

I get really hugely frustrated and I close myself to keep on

#

Because I have like this idk

#

Perfectionism or idk the need to do things in order so if I didn't do something before I won't do the thing is after it infuriates me a whole lot

#

And when I'm like that every little things just gets me even worse like my slow computer that didn't help to try and fix the issue

#

#

the scene crime

#

PS C:\Users\fuchi\OneDrive\Documentos\codigos_python> py primer_modulo.py

C:\Users\fuchi\AppData\Local\Programs\Python\Python310\python.exe: can’t open file ‘C:\\Users\\fuchi\\OneDrive\\Documentos\\codigos_python\\primer_modulo.py’: [Errno 2] No such file or directory

#

the clue (error)

#

The annoying unsatisfying solution

#

python Primer_modulo\primer_modulo.py

#

To see if you know what was going on

#

Ignoring why the other one before this one didn't work because since I fixed with dark magic there's nothing else I can do about it

#

Ah btw going back to the other stuff

#

coral geyser Aug 5, 2022, 3:34 AM

#

wary cloak

you aren't' in the right directory

coral geyser Aug 5, 2022, 3:35 AM

#

wary cloak

So looks like it works

wary cloak Aug 5, 2022, 3:35 AM

#

coral geyser you aren't' in the right directory

How do I fix it?

coral geyser Aug 5, 2022, 3:35 AM

#

wary cloak How do I fix it?

cd Primer_modulo

wary cloak Aug 5, 2022, 3:35 AM

#

Ok

#

Now I did that but

#

It fails anyways

#

Let me try to

#

Copy paste it here

#

..

#

Dark magic

#

It worked

#

Well..

#

Well that's it

#

I remove the usb now?

coral geyser Aug 5, 2022, 3:37 AM

#

wary cloak I remove the usb now?

I it should work on other computers now

#

I hope

wary cloak Aug 5, 2022, 3:37 AM

#

Me too

#

There's no way to know until the day arrives

coral geyser Aug 5, 2022, 3:38 AM

#

On the bright side of things I finally got my gentoo working again

#

It only took like a week?

wary cloak Aug 5, 2022, 3:38 AM

#

That's really good

coral geyser Aug 5, 2022, 3:38 AM

#

So more code?

#

or we good for today?

wary cloak Aug 5, 2022, 3:39 AM

#

More code

#

I want your opinion about this

wary cloak Aug 5, 2022, 3:39 AM

#

wary cloak Btw I was kinda thinking..

.

coral geyser Aug 5, 2022, 3:40 AM

#

wary cloak .

which function was this? the one that let you print and align stuff?

wary cloak Aug 5, 2022, 3:40 AM

#

I think it would be nice and maybe slightly useful but maybe so unnecessary idk, the context on why, when and where I did that function and where I'm standing it's waaaaay different

wary cloak Aug 5, 2022, 3:41 AM

#

coral geyser which function was this? the one that let you print and align stuff?

It printed, told me if it was too long, could automatically center stuff or I could chose where it would start and also with the empty const and all I avoided some annoyences when calling it

coral geyser Aug 5, 2022, 3:41 AM

#

yeah, I think you should move to more functionality at this point with like the key pad

wary cloak Aug 5, 2022, 3:42 AM

#

struct PrintOptions {

  String toPrint;

  int pos;

};

 

const PrintOptions empty = {"", 0};

 

 

void imprimirFila(byte posY, byte posX, String fila){

  if(fila != ""){

    byte caracteres_restantes = 20 - fila.length();

 

    if(caracteres_restantes<0){

      lcd.print("muy largo 1");

    }

  byte posicionX = posX == 'c'? (caracteres_restantes/2) : posX;

  lcd.setCursor(posicionX,posY);

  lcd.print(fila);

 

  }

}

 

void imprimir(PrintOptions fila1 = empty, PrintOptions fila2 = empty, PrintOptions fila3 = empty, PrintOptions fila4 = empty) {

  imprimirFila(0, fila1.pos, fila1.toPrint);

  imprimirFila(1, fila2.pos, fila2.toPrint);

  imprimirFila(2, fila3.pos, fila3.toPrint);

  imprimirFila(3, fila4.pos, fila4.toPrint);

}

 

Ejemplos:

 

do{

    imprimir(

    { "Elija una bebida",  'c' },

    { "1-Fernet con Coca",  0  },

    { "2-Sex on the beach", 0  },

    { "3-Agua",             0  }

    );

 

do{

    imprimir(

    { "Elija una bebida",  'c' },

    { "1-Fernet con Coca",  0  },

    { "2-Sex on the beach", 0  },

    { "3-Agua",             0  }

    );

 

 

imprimir(

    empty,

    { "preparando...", 'c'}

    );

coral geyser Aug 5, 2022, 3:42 AM

#

you can come back if you find you need it

wary cloak Aug 5, 2022, 3:42 AM

#

This one

#

Well then if we aren't doing it there's one last thing I want from this project

#

It's to fully understand it and the only part I don't is the lcd module

#

Sorry

#

I2C module

coral geyser Aug 5, 2022, 3:43 AM

#

Can you paste each section you want to discuss?

wary cloak Aug 5, 2022, 3:43 AM

#

//! Doc for module
use embedded_hal::blocking::i2c::Write;
use lcd::{Delay, Hardware};

const ADDRESS: u8 = 0x27;


///Este Struct representa las conexiones del LCD 
pub struct LcdConnection {
    dev: arduino_hal::I2c,
    data: u8,
}


impl LcdConnection {
 ///Crea una nueva instancia del Struct LcdConnection 
 ///reciviendo el Struct como parametro y seteando mediante datos del datasheet
 ///que la backlight se prenda
    pub fn new(dev: arduino_hal::I2c) -> Self {
        Self {
            dev,
            data: 0b0000_1000, // backlight prendida por default
        }
    }


    ///Funcion que setea los bits del
    ///circuito I2C para controlar los
    /// cables del LCD
    fn set_bit(&mut self, offset: u8, bit: bool) {
        if bit {
            self.data |= 1 << offset;
        } else {
            self.data &= !(1 << offset);
        }
    }
}

impl Hardware for LcdConnection {
    fn rs(&mut self, bit: bool) {
        self.set_bit(0, bit);
    }

    fn enable(&mut self, bit: bool) {
        self.set_bit(2, bit);
    }

    fn data(&mut self, bits: u8) {
        assert!(bits & 0xF0 == 0, "Modo de 4-bits requerido");
        self.data = (self.data & 0x0F) | (bits << 4);
    }

    fn apply(&mut self) {
        self.dev.write(ADDRESS, &[self.data]).unwrap();
    }
}

impl Delay for LcdConnection {
    fn delay_us(&mut self, delay_usec: u32) {
        arduino_hal::delay_us(delay_usec);
    }
}

#

I brought it all just in case

coral geyser Aug 5, 2022, 3:44 AM

#

that works

wary cloak Aug 5, 2022, 3:44 AM

#

Let's see..

#

Well first some needes use statements I ain't questioning because in any case compiler will tell me add this use statement so

#

Needed*

#

The const address we declared it because we needed and adress to write to in the write function and I knew which one was it

#

Now, a public structure called lcd connection that represents lcd connections, what is dev and what is data?

coral geyser Aug 5, 2022, 3:47 AM

#

wary cloak Now, a public structure called lcd connection that represents lcd connections, w...

dev is the i2c device to use for the communication

#

and data is the current state of the data to send

wary cloak Aug 5, 2022, 3:47 AM

#

Remember me what was exactly the device? I remember I had struggle to understand it before

coral geyser Aug 5, 2022, 3:48 AM

#

the data is of the form

Data3 Data2 Data1 Data0 BackLight Enable Unused Reset
    7     6     5     4         3      2      1     0

wary cloak Aug 5, 2022, 3:48 AM

#

Oh so the lcd connections indeed, the 8 wires it would normally have, data

#

And the i2c device I connected it to?

coral geyser Aug 5, 2022, 3:49 AM

#

wary cloak Remember me what was exactly the device? I remember I had struggle to understand...

The arduino_hal:I2c is the i2c device inside the mega

#

It knows how to talk i2c

#

It will talk i2c to the address you tell it reading/writing data to the remote device

coral geyser Aug 5, 2022, 3:50 AM

#

wary cloak Oh so the lcd connections indeed, the 8 wires it would normally have, data

The circuit board on the back of the lcd takes these bits (on/off) and directly sets the wires going to the lcd board

wary cloak Aug 5, 2022, 3:51 AM

#

So then in the new function I set the data so the back light it's always turn on, and in dev I send the i2c instance which had as information the speed of communication, the two pins that were used for the I2c protocol one input for receiving the data and one output to display and TWI which I don't remember what is, what was it!

#

? *

coral geyser Aug 5, 2022, 3:52 AM

#

wary cloak So then in the new function I set the data so the back light it's always turn on...

TWI is Two Wire Interface, or i2c. It's the name of the device on the Mega chip

wary cloak Aug 5, 2022, 3:52 AM

#

Oh ok

#

Then there's this function

#

Set bit

#

Here I do have no clue

#

What's offset

#

What would be bit and why is it a boolean

#

What are the idea else conditions

#

if else*

#

The only thing that makes sense to me is the mutable reference to self as parameter

coral geyser Aug 5, 2022, 3:56 AM

#

?eval ```rust
#[derive(Debug)]
struct Demo {
data: u8
}

impl Demo {
fn set_bit(&mut self, offset: u8, bit: bool) {
if bit {
self.data |= 1 << offset;
} else {
self.data &= !(1 << offset);
}
}
}

let mut x = Demo { data: 0 };
x.set_bit(3, true);
dbg!(&x);
println!("{:08b}", x.data);

robust mountainBOT Aug 5, 2022, 3:56 AM

#

[src/main.rs:19] &x = Demo {
    data: 8,
}

00001000
()

coral geyser Aug 5, 2022, 3:57 AM

#

there we go

#

see how bit index 3 is now a 1

wary cloak Aug 5, 2022, 3:57 AM

#

It starts counting in 0?

coral geyser Aug 5, 2022, 3:57 AM

#

offset is the bit to change, bit is the value to set it to (true=1, false=0)

coral geyser Aug 5, 2022, 3:57 AM

#

wary cloak It starts counting in 0?

yep

coral geyser Aug 5, 2022, 3:57 AM

#

coral geyser the data is of the form ``` Data3 Data2 Data1 Data0 BackLight Enable Unused Rese...

its the same indexes as these

wary cloak Aug 5, 2022, 3:58 AM

#

And what about that

#

|= &= << offset

coral geyser Aug 5, 2022, 3:59 AM

#

The first one is

data = 0000_0000 | (2^offset)

which is

data = 0000_0000 | 0000_0100

#

|= is the assignment or operator and << is the shift left

#

<< also is times by 2 for each time you do it

wary cloak Aug 5, 2022, 4:00 AM

#

So..

#

Self.data

#

Is by default 0000_0000

#

|= makes an or operation

#

And offset? I didn't understand the explanation earlier

coral geyser Aug 5, 2022, 4:01 AM

#

x << y is "the bits of x shifted left by y number of bits"

wary cloak Aug 5, 2022, 4:02 AM

#

I guess the or is to force a one with offset and and so it's a 0 and what is asking is if bit is true or false tho idk when would be in each state

coral geyser Aug 5, 2022, 4:02 AM

#

wary cloak I guess the or is to force a one with offset and and so it's a 0 and what is ask...

yeah the or will make sure the one bit we selected is set without changing anything else

wary cloak Aug 5, 2022, 4:03 AM

#

Offset would be the bit selected then?

#

Of the 8

coral geyser Aug 5, 2022, 4:03 AM

#

yep

wary cloak Aug 5, 2022, 4:03 AM

#

And why is there a need to do the 1 <<?

coral geyser Aug 5, 2022, 4:04 AM

#

because we need the value where a bit is set at the offset position

#

for example offset 3 is 0000_0011 in binary

#

which is not what we want

#

so we do 2 * 2 * 2 = 8 = 0000_1000

wary cloak Aug 5, 2022, 4:05 AM

#

Mmm..

coral geyser Aug 5, 2022, 4:06 AM

#

my math got away from me there

wary cloak Aug 5, 2022, 4:06 AM

#

I don't get at all why 1 << makes power of two whatever the number of offset is

#

Because wouldn't it read like

wary cloak Aug 5, 2022, 4:07 AM

#

coral geyser `x << y` is "the bits of x shifted left by y number of bits"

The bits of 1 (it's just a 1) shifted left by offset number of bits

#

Mmm..

#

Oh

#

I think I get it

#

so

#

It would be like

#

I have 00000001

coral geyser Aug 5, 2022, 4:07 AM

#

?eval mode=release ```rust
println!("{:08b}", 0b0110_1001_u8);
println!("{:08b}", 0b0110_1001_u8 << 3);
println!("{:08b}", 0b0110_1001_u8 * 2 * 2 * 2);

robust mountainBOT Aug 5, 2022, 4:07 AM

#

wary cloak Aug 5, 2022, 4:07 AM

#

And the offset will move it base on what offeset is

#

So if offset 3

#

That 1

#

Will move to the left 3 spaces

#

Is that?

coral geyser Aug 5, 2022, 4:08 AM

#

wary cloak Will move to the left 3 spaces

yep

#

which in binary each shift is a times by 2

wary cloak Aug 5, 2022, 4:09 AM

#

why do we have to do an or operation to the the self.data, so self.data stores that at the end?

coral geyser Aug 5, 2022, 4:10 AM

#

coral geyser ?eval mode=release ```rust println!("{:08b}", 0b0110_1001_u8); println!("{:08b}"...

as seen here ^ (the times by 2)

coral geyser Aug 5, 2022, 4:10 AM

#

wary cloak why do we have to do an or operation to the the self.data, so self.data stores t...

if we didn't we would loose the state of all the other bits

wary cloak Aug 5, 2022, 4:10 AM

#

So it's to not overwrite?

coral geyser Aug 5, 2022, 4:10 AM

#

yep

#

x | 0 = x

#

x | 1 = 1

wary cloak Aug 5, 2022, 4:11 AM

#

By doing an or all that was 0 and changed to 1

#

Would be 1

#

But what was 1 would stay

#

Now, could you explain to me what we do in the else case?

coral geyser Aug 5, 2022, 4:11 AM

#

yep

#

we do the same but we invert the mask (thats what the 1 << offset) is called

wary cloak Aug 5, 2022, 4:12 AM

#

Why is there a not in 1 << offset

coral geyser Aug 5, 2022, 4:12 AM

#

?eval mode=release ```rust
println!("{:08b}", !(1u8 << 3));

robust mountainBOT Aug 5, 2022, 4:12 AM

#

11110111
()

coral geyser Aug 5, 2022, 4:13 AM

#

wary cloak Why is there a not in 1 << offset

we flip all the bits to the opposite then and with data

#

which is
x & 0 = 0
x & 1 = x

#

so we only set one bit to 0 and keep the rest as they were

wary cloak Aug 5, 2022, 4:14 AM

#

I think to understand best first I need to know

#

When would bit be true and when false

#

So I know what I want to do in else so I can the understand how to

coral geyser Aug 5, 2022, 4:15 AM

#

wary cloak When would bit be true and when false

say for example you wanted to turn off the backlight

#

which is bit 3

#

how would you take self.data=0b1011_1010 and disable the backlight bit?

wary cloak Aug 5, 2022, 4:15 AM

#

Mmm

#

Wait

#

Didn't you say bit 3

#

Oh

#

Nothing

#

Well I would need to set bit 3 to 0 and only bit 3

coral geyser Aug 5, 2022, 4:16 AM

#

and you have the operations, +, -, *, /, >>, <<, |, &, ^, !

#

but no data[3] = 1 thats not allowed

wary cloak Aug 5, 2022, 4:17 AM

#

Ah wait

#

Let me see..

#

So in the else case

#

Since you said

#

Bit 3

#

Offset would be 3

#

So the result of 1 << offset

#

Would be

#

00001000

#

But then

#

You invert it

#

11110111

#

And then to self data

#

Do an and

#

And since that's the only 0 bit

#

That bit would be set to 0

#

And the others would remain the same

#

Got it

coral geyser Aug 5, 2022, 4:18 AM

#

exactly

wary cloak Aug 5, 2022, 4:19 AM

#

And bit is true when I want to send an order to set a bit and false when I send an order to turn off a bit?

coral geyser Aug 5, 2022, 4:19 AM

#

yep

wary cloak Aug 5, 2022, 4:19 AM

#

Ok best

#

Next*

#

Hardware is a trait?

coral geyser Aug 5, 2022, 4:20 AM

#

Yep

wary cloak Aug 5, 2022, 4:20 AM

#

Mm..

#

Let's go through the first two that seems easier

#

because both take a mutable reference to self and bit to call self.set_bit

#

Oh

#

I guess those are reset and enable

#

So you are passing as argument offset the bit they are and well bit

coral geyser Aug 5, 2022, 4:21 AM

#

yep

wary cloak Aug 5, 2022, 4:21 AM

#

Why have a function for rs and enable?

coral geyser Aug 5, 2022, 4:22 AM

#

That's what the lcd crate will call when it needs to do those operations

wary cloak Aug 5, 2022, 4:22 AM

#

And what's exactly reseted and enabled? It's a turn on turn off or what is it?

coral geyser Aug 5, 2022, 4:23 AM

#

Reset, resets the lcd back to it's default state, and enable enable/disables it showing anything

wary cloak Aug 5, 2022, 4:23 AM

#

Oh ok

#

Then a tricky one

#

Data

#

Mutable reference to self obvious

#

What would be bits? The eight controllable bits of the lcd?

coral geyser Aug 5, 2022, 4:24 AM

#

wary cloak What would be bits? The eight controllable bits of the lcd?

Its 4 bits of data

#

stored in the lower half of the byte

wary cloak Aug 5, 2022, 4:24 AM

#

What does those 4 bits do?

coral geyser Aug 5, 2022, 4:25 AM

#

the lcd crate uses them to talk to the lcd controller (the chip that actually controls the display pixels)

wary cloak Aug 5, 2022, 4:26 AM

#

fn data(&mut self, bits: u8) {
        assert!(bits & 0xF0 == 0, "Modo de 4-bits requerido");
        self.data = (self.data & 0x0F) | (bits << 4);
    }

#

They are a part of the 8 bits that control the lcd or

#

Another set of bits

coral geyser Aug 5, 2022, 4:27 AM

#

wary cloak ```rust fn data(&mut self, bits: u8) { assert!(bits & 0xF0 == 0, "Modo d...

so here bits is of the form

0 0 0 0 data3 data2 data1 data0

#

https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller is the way the 4 bits are used if you are curios

wary cloak Aug 5, 2022, 4:28 AM

#

So I guess he uses assert because he wants you panic if its not using four bits but less or more idk

coral geyser Aug 5, 2022, 4:29 AM

#

wary cloak So I guess he uses assert because he wants you panic if its not using four bits ...

yep, the lcd crate can also do 8 wire mode

wary cloak Aug 5, 2022, 4:29 AM

#

Idk how an and operantion would be equal to string, thanks even weirder

coral geyser Aug 5, 2022, 4:30 AM

#

bits & 0xF0 == 0 is true if the 4 high bits are 0s

wary cloak Aug 5, 2022, 4:30 AM

#

And how is true equal to 4 bit mode required (?

wary cloak Aug 5, 2022, 4:30 AM

#

coral geyser bits & 0xF0 == 0 is true if the 4 high bits are 0s

The ones we pass in?

coral geyser Aug 5, 2022, 4:31 AM

#

?eval ```rust
dbg!(0b1000_0000_u8 & 0xF0 == 0);
dbg!(0b0010_0100_u8 & 0xF0 == 0);
dbg!(0b0000_0100_u8 & 0xF0 == 0);
dbg!(0b0000_0101_u8 & 0xF0 == 0);

robust mountainBOT Aug 5, 2022, 4:31 AM

#

[src/main.rs:2] 0b1000_0000_u8 & 0xF0 == 0 = false
[src/main.rs:3] 0b0010_0100_u8 & 0xF0 == 0 = false
[src/main.rs:4] 0b0000_0100_u8 & 0xF0 == 0 = true
[src/main.rs:5] 0b0000_0101_u8 & 0xF0 == 0 = true

()

coral geyser Aug 5, 2022, 4:31 AM

#

wary cloak The ones we pass in?

yep

wary cloak Aug 5, 2022, 4:31 AM

#

wary cloak And how is true equal to 4 bit mode required (?

.

#

Ah wait

#

This isn't asserteq

#

What did assert only?

coral geyser Aug 5, 2022, 4:32 AM

#

?eval assert!(false, "hello from the error");

robust mountainBOT Aug 5, 2022, 4:32 AM

#

thread 'main' panicked at 'hello from the error', src/main.rs:2:1
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

wary cloak Aug 5, 2022, 4:32 AM

#

Ah

#

So

#

If the condition as first argument isn't meant it prints that

coral geyser Aug 5, 2022, 4:32 AM

#

yep

wary cloak Aug 5, 2022, 4:32 AM

#

And what happens below?

coral geyser Aug 5, 2022, 4:33 AM

#

so we have this data coming from the lcd crate

0 0 0 0 data3 data2 data1 data0

#

but we need to send it like this

Data3 Data2 Data1 Data0 BackLight Enable Unused Reset
    7     6     5     4         3      2      1     0

#

so we need to get the 4 bits of data into self.data but shifted over 4 spaces

wary cloak Aug 5, 2022, 4:35 AM

#

self.data & 0x0F what would be for? Make sure the other bits, backlight and so are 0?

#

Because self.data

#

Is already 00000000

#

Or is it making sure in case something had been turned on before doing this idk

coral geyser Aug 5, 2022, 4:36 AM

#

wary cloak self.data & 0x0F what would be for? Make sure the other bits, backlight and so a...

x & 0x0F is x & 0000_1111 which forces the 4 high bits to be 0

wary cloak Aug 5, 2022, 4:37 AM

#

The high bits being the ones we don't control?

coral geyser Aug 5, 2022, 4:37 AM

#

because there may have been data previously in self.data from the lcd crate

coral geyser Aug 5, 2022, 4:37 AM

#

wary cloak The high bits being the ones we don't control?

they are the once where we want to put the data the lcd crate gave us

wary cloak Aug 5, 2022, 4:37 AM

#

So first we make sure data.self is 000000

coral geyser Aug 5, 2022, 4:38 AM

#

0000_abcd where the state of a, b, c, d is unknown

wary cloak Aug 5, 2022, 4:39 AM

#

And then we move the bits to the left to have it as we want them ig

#

And why the or?

#

Because anyways

#

It's 0000000

coral geyser Aug 5, 2022, 4:40 AM

#

wary cloak And why the or?

The or merges the two values together

#

0000_abcd | xyzw_0000 = xyzw_abcd

wary cloak Aug 5, 2022, 4:40 AM

#

The self.data guaranteed to be 0 and the bits moved even if they are all 0 something significant happen ig

#

So now the bits we sent are in another position and self.data whatever it was it's now 0000000

coral geyser Aug 5, 2022, 4:41 AM

#

okay here I will give an example

#

So we have self.data = 0101_1001 where the backlight is on the display is enabled and we have some data from the last time the lcd crate talked with the controller

#

the lcd crate now wants to send the data 0000_1101 to the lcd how do we do that?

wary cloak Aug 5, 2022, 4:43 AM

#

1101 are the bits we send as arguments?

#

The position I mean

#

Because when we sent them they have to be 0000

coral geyser Aug 5, 2022, 4:44 AM

#

wary cloak Because when we sent them they have to be 0000

lets assume we have been running the code for a while

wary cloak Aug 5, 2022, 4:44 AM

#

But doesn't the function panic if we don't send 0000?

coral geyser Aug 5, 2022, 4:45 AM

#

wary cloak But doesn't the function panic if we don't send 0000?

we did send it 0000 : 0000_1101

wary cloak Aug 5, 2022, 4:45 AM

#

ferrisWhat

#

But

#

Below

#

We move then to the left

#

But they are already

#

All the way to the left

coral geyser Aug 5, 2022, 4:45 AM

#

0000_1101 << 4 = 1101_0000

wary cloak Aug 5, 2022, 4:46 AM

#

Btw this data bits are the ones that actually print stuff?

coral geyser Aug 5, 2022, 4:46 AM

#

wary cloak Btw this data bits are the ones that actually print stuff?

yeah

wary cloak Aug 5, 2022, 4:47 AM

#

And why we need to move them and have it that way?

coral geyser Aug 5, 2022, 4:48 AM

#

coral geyser the data is of the form ``` Data3 Data2 Data1 Data0 BackLight Enable Unused Rese...

because we need to send this type of data over the i2c

wary cloak Aug 5, 2022, 4:49 AM

#

So the data the lcd normally sends and the one that the I2C expects it's different so we need to say "translate" The message from the lcd way to the i2c way and that's what this function does by switching the high and low bits?

coral geyser Aug 5, 2022, 4:49 AM

#

yep

wary cloak Aug 5, 2022, 4:50 AM

#

Ok you can finish your example now that I Know this

coral geyser Aug 5, 2022, 4:50 AM

#

wary cloak Ok you can finish your example now that I Know this

you are suppose to finish it ferrisHmm

wary cloak Aug 5, 2022, 4:50 AM

#

gopherballSweat

#

Well let's see..

#

Self.data is 0101_1001 and the bits I send are 0000, I want 0000_1101

#

It passes the assert statement

#

So first

#

Self.data goes from 0101_1001 to 0 because of the and 0x0F the 1001 changes the 0000 and the 0101 changes to 0 because I set those bits in the function

#

Then I have bits which is 0000 because it has two

#

And it goes to the left 4 spaces

#

Tho I will see before doing this 00000000 and after 00000000

#

It's now in the idiomatic way of the i2c

#

Thing is..

#

I never see it

coral geyser Aug 5, 2022, 4:54 AM

#

What we want to end up with is: 1101_1001

wary cloak Aug 5, 2022, 4:54 AM

#

Being other than 0

#

Because we said the and makes sure self.data is 0

#

And bits has to be 0

#

So this always end up in 0

coral geyser Aug 5, 2022, 4:55 AM

#

wary cloak Because we said the and makes sure self.data is 0

makes sure part of it is 0

wary cloak Aug 5, 2022, 4:56 AM

#

But

#

The other bits

#

Mmm

#

Mmm....

#

So

#

Basically

#

With write or whatever

#

I write

#

1001_000

#

0000*

#

But for the i2c what I want is

#

0000_1001

#

And this moves them

#

Ok I got it

coral geyser Aug 5, 2022, 4:57 AM

#

no we already have the 1001 part where it should be

wary cloak Aug 5, 2022, 4:57 AM

#

What.. -

coral geyser Aug 5, 2022, 4:57 AM

#

Okay let me say it again

wary cloak Aug 5, 2022, 4:57 AM

#

I was making another quick example-

coral geyser Aug 5, 2022, 4:58 AM

#

self.data = 0101_1001

#

bits = 0000_1101

#

we want 1101_1001

wary cloak Aug 5, 2022, 4:58 AM

#

wary cloak I was making another quick example-

Where the lcd wrote 1001_0000 so for the i2c I want 0000_1001 and call this function for that (?

coral geyser Aug 5, 2022, 4:58 AM

#

wary cloak Where the lcd wrote 1001_0000 so for the i2c I want 0000_1001 and call this func...

no

coral geyser Aug 5, 2022, 4:58 AM

#

wary cloak Where the lcd wrote 1001_0000 so for the i2c I want 0000_1001 and call this func...

that would fail the assert

wary cloak Aug 5, 2022, 4:59 AM

#

God damn it's so complicated..

#

But If those are the bits to actually write

#

Why would they always be 0

#

Mmm oh

#

Mmm..

coral geyser Aug 5, 2022, 4:59 AM

#

wary cloak Why would they always be 0

the bits variable is 0000_abcd because that is what the lcd crate gives us

wary cloak Aug 5, 2022, 5:00 AM

#

We just pass that in to move the lcd message but they are not linked to the actual value of those bits in the byte?

wary cloak Aug 5, 2022, 5:00 AM

#

coral geyser bits = 0000_1101

How are bits that tho

#

If we can send only 4

coral geyser Aug 5, 2022, 5:02 AM

#

wary cloak If we can send only 4

the lcd crate gives them to us in the low four bits

0 0 0 0 _ a b c d
7 6 5 4   3 2 1 0

wary cloak Aug 5, 2022, 5:02 AM

#

Let's see..

#

So..

#

The lcd operates with 8 bits.

#

Which are

wary cloak Aug 5, 2022, 5:03 AM

#

coral geyser the lcd crate gives them to us in the low four bits ``` 0 0 0 0 _ a b c d 7 6 5 ...

In this format the 7,6,5,4 the usual

#

Without the i2c we happily write to it

#

But since the creator of i2c hates humanity

#

The i2c doesn't directly understand what the lcd gives him raw

#

And the delicate one will only understand it in a backwards order so instead for 7,6,5 and so he wants 0,1,2,3

#

Up until that point is good?

coral geyser Aug 5, 2022, 5:05 AM

#

wary cloak And the delicate one will only understand it in a backwards order so instead for...

not backwards, shifted over

#

a b c d _ bl rs 0 en

wary cloak Aug 5, 2022, 5:07 AM

#

Could you do the comparison above what the lcd naturally does and below what i2c expects?

coral geyser Aug 5, 2022, 5:09 AM

#

0 0 0 0 _  a  b c  d --- lcd crate
a b c d _ bl rs 0 en --- i2c

wary cloak Aug 5, 2022, 5:10 AM

#

why above there isn't bl rs and that?

coral geyser Aug 5, 2022, 5:10 AM

#

wary cloak why above there isn't bl rs and that?

because those are set by the other methods in Hardware

wary cloak Aug 5, 2022, 5:10 AM

#

Oh ok

#

The bits we pass to represent abcd ?

#

To the function we pass bits

#

4 onky

#

Only*

#

Either they represent something

coral geyser Aug 5, 2022, 5:12 AM

#

wary cloak To the function we pass bits

the lcd crate passes them to us

wary cloak Aug 5, 2022, 5:12 AM

#

Or nothing but they are merely used

wary cloak Aug 5, 2022, 5:13 AM

#

coral geyser the lcd crate passes them to us

So those bits would be the ones that are 0000 so the program makes sure they are the correct bits? (Tho idk why wouldn't they)

coral geyser Aug 5, 2022, 5:13 AM

#

wary cloak So those bits would be the ones that are 0000 so the program makes sure they are...

no they aren't 0000

wary cloak Aug 5, 2022, 5:14 AM

#

Tho it's weird they are always 0 like it isn't ever enable or with backlight on

coral geyser Aug 5, 2022, 5:14 AM

#

they are the a,b,c,d bits

wary cloak Aug 5, 2022, 5:14 AM

#

coral geyser no they aren't 0000

But if we don't pass in 0000 the program panics

coral geyser Aug 5, 2022, 5:14 AM

#

wary cloak But if we don't pass in 0000 the program panics

oh, yeah lcd will never pass in data to those

wary cloak Aug 5, 2022, 5:14 AM

#

so abdc will have nothing in them?

coral geyser Aug 5, 2022, 5:15 AM

#

wait, what have you been interpreting "_" as in those things above?

coral geyser Aug 5, 2022, 5:15 AM

#

coral geyser ``` 0 0 0 0 _ a b c d --- lcd crate a b c d _ bl rs 0 en --- i2c ```

^

wary cloak Aug 5, 2022, 5:16 AM

#

I think I am just unable to understand this and I better should give it up

#

Because it's nice to know and allow but if it literally it's just for the sake of it to understand it and I waste a lot of time I better stop

#

I'll just leave that that function changes the lcd format to something the i2c knows how to read

coral geyser Aug 5, 2022, 5:18 AM

#

wary cloak I'll just leave that that function changes the lcd format to something the i2c k...

I have failed you ferrisSob

wary cloak Aug 5, 2022, 5:18 AM

#

No no, I'm just dumb(?

#

Idk why I couldn't understand it maybe I'm too asleep but I don't think is that, it's just weird maybe we would need a black board and a lot of patience

coral geyser Aug 5, 2022, 5:19 AM

#

yeah ferrisWeary

wary cloak Aug 5, 2022, 5:20 AM

#

I guess apply finally does the writting accesing to dev which is the I2C the adress to write to(adress of what?) And the data that got from the function data that the i2c can't act upon and it can fail so unwrap

#

More or less that ig

#

And well delay it's just so it know how to delay

#

It heavily calls my attention how lcd crate is calling all this created by us but it's too deep

#

So we now officially finished the lcd

#

Sadly it's too late to do more

#

But let's speak a slight bit of the matricial keyboard

coral geyser Aug 5, 2022, 5:28 AM

#

okay

wary cloak Aug 5, 2022, 5:28 AM

#

As I showed you

#

The code I made for it working alone with the library is the following

#

#include <Keypad.h>

const byte FILAS = 4;
const byte COLUMNAS = 4;

const char keys[FILAS][COLUMNAS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

const byte pinColumnas[COLUMNAS] = {22, 23, 24, 25};
const byte pinFilas[FILAS] = {26, 27, 28, 29};

Keypad keypad(makeKeymap(keys), pinFilas, pinColumnas, FILAS, COLUMNAS);

void setup() {

  Serial.begin(9600);

}

void loop() {

  char key = keypad.getKey();

  if (key != NO_KEY) {
    Serial.println(key);
  }
  
  
}

#

The setup it needs it's the number of columns and rows, the matrix with it's keys, what pins are used for rows and which for columns and then finally create and object from keypad class with all that data and the call to makeKeyMap to turn the matrix into string

#

After that

#

You just use it.

#

In the project

#

The only thing I did

#

Was call wait for key to block the program and return the key pressed

#

In our lcd programm

#

We would only need to

#

Get rid of read_char and replace it for the equivalent in the matricial keyboard

#

That's it

#

But ofc first we are first gonna do a small project to test it, if we can get what key was pressed, get it to block, see if there's a wait for key like function

#

And well then create another project when we merge the two tho as I said.

#

It should be like

#

Really fast

#

And then we could do the last step to finish the base functionality which is to toggle the pins where the relays lay an x amount of time depending on the intensity x pretty easy

#

One last thing I would like that this time we look together for the library I go to crates.io and you tell me how to look for it, how to know if it's good and so, so I learn that

#

A well that's the plan

#

If there was no kibr

#

Library*

#

I have a code to detect the key pressed without library

#

#include <stdio.h>

struct Key {

  byte id;
  char name[5];

};

const struct Key ONE   = {0b10001000, "1"};
const struct Key TWO   = {0b10000100, "2"};
const struct Key THREE = {0b10000010, "3"};
const struct Key KEY_A = {0b10000001, "A"};

const struct Key FOUR  = {0b01001000, "4"};
const struct Key FIVE  = {0b01000100, "5"};
const struct Key SIX   = {0b01000010, "6"};
const struct Key KEY_B = {0b01000001, "B"};

const struct Key SEVEN = {0b00101000, "7"};
const struct Key EIGHT = {0b00100100, "8"};
const struct Key NINE  = {0b00100010, "9"};
const struct Key KEY_C = {0b00100001, "C"};

const struct Key ASTRK = {0b00011000, "*"};
const struct Key ZERO  = {0b00010100, "0"};
const struct Key HASH  = {0b00010010, "#"};
const struct Key KEY_D = {0b00010001, "D"};

#define COLUMNAS 4
#define FILAS 4

const struct Key KEYPAD[FILAS][COLUMNAS] = {
  { ONE, TWO, THREE, KEY_A },
  { FOUR, FIVE, SIX, KEY_B },
  { SEVEN, EIGHT, NINE, KEY_C },
  { ASTRK, ZERO, HASH, KEY_D }
};

void setup() {
  DDRA = 0x0F;
  Serial.begin(9600);
}

void loop() {

  PORTA = 0b00001000;

  for (byte columna = 0; columna < COLUMNAS; columna++) {
    
    
    for (byte fila = 0; fila < FILAS; fila++) {
      
      if (PINA == KEYPAD[fila][columna].id) {
        char imprimir[25];
        sprintf(imprimir, "Se presionó la tecla %s", KEYPAD[fila][columna].name);
        Serial.println(imprimir);
        delay(200);
      }

    }

    PORTA >>= 1;
    
  }

}

#

This one

#

So well I think tomorrow we could actually do that I just said so in the weekend finally the real deal would begin

#

Rfid

#

Once we are done with the rfid it's basically done

#

Because sensors aren't that complicated

#

I'm a bit worried but interested on how is it gonna be(?

#

I please hope it ain't that hard and it doesn't take that long

coral geyser Aug 5, 2022, 5:40 AM

#

we will see ferrisHmm

wary cloak Aug 5, 2022, 5:40 AM

#

I will pray, that would be mean we wouldn't be that far way from finishing this

#

Oh and

#

In some days I'm getting my raspberry Pi pico

#

So after the project I would want to be like prepared for it

#

Install the abstraction for this one

#

Be able to use that Arduino ide

#

And install whatever I need for micro python

#

I would guess all my Arduino code would work so I don't have to re learn or anything

#

Micro python since I know python idk if I would need to know specifically that also idk if I'm really gonna use it instead of Arduino IDE or rust

#

Now..

#

I would like to program it with rust

#

But there's a set amount of times I'm re writing a project

#

And two times seems like somewhat of a waste of time

#

Even though I would really like for my project to instead of being in a Chinese Arduino board in c++ be in raspberry Pi in rust but

#

I really don't want to do all over again even tho I want to learn how to use rust in the raspberry pi pico

#

But there's nothing else I can do so I would kinda just have it there

#

That's the Shame with embedded systems I won't be able to learn because there's nothing I can program

#

But in any case just help me with the installation of the Hal and that's it

#

In the worst case scenario at least I already know Arduino and could learn micro python

wary cloak Aug 5, 2022, 5:46 AM

#

wary cloak And two times seems like somewhat of a waste of time

Unless the same code we did works maybe with reaaaally slight changes in that case, microcontroller change

#

But idk, I hope

#

Because I don't want to learn 80 ways of doing the same like I'm always re learning

#

And that would make sooo easy the transition to raspberry Pi

#

I can already program it an Arduino ide like in Arduino board only that I have two extra possibilities of plain C++ and micro python if I get that much into python but I would like that I'm also able to program it in rust, because rust+raspberry Pi pico sound reaaaally powerful

wary cloak Aug 5, 2022, 7:16 PM

#

Back home

wary cloak Aug 5, 2022, 9:53 PM

#

@coral geyser are you present?

coral geyser Aug 5, 2022, 9:56 PM

#

yep

wary cloak Aug 5, 2022, 9:57 PM

#

Because in some minutes I'm turning the pc on

#

So..

#

How do I go to crates.io, just type it and it's the first?

coral geyser Aug 5, 2022, 10:14 PM

#

yep

wary cloak Aug 5, 2022, 10:15 PM

#

How intuitive is it to navigate in?

#

I had close to zero experiences searching for libraries

#

Ok I'm in

#

Do I search it as keyboard? Keypad?

coral geyser Aug 5, 2022, 10:24 PM

#

wary cloak Do I search it as keyboard? Keypad?

yep

wary cloak Aug 5, 2022, 10:25 PM

#

Which of the two-

coral geyser Aug 5, 2022, 10:25 PM

#

wary cloak Which of the two-

try both

wary cloak Aug 5, 2022, 10:25 PM

#

Ok let's see

#

#

Mmm

#

Idk what would be platform agnostic

#

The second one says embedded hal and had been updated at least 1 year and not 4

#

The ones below seems like nothing to do

coral geyser Aug 5, 2022, 10:27 PM

#

"A crate for reading a 3X4 keypad with embedded-hal"

wary cloak Aug 5, 2022, 10:28 PM

#

wary cloak Aug 5, 2022, 10:28 PM

#

coral geyser "A crate for reading a 3X4 keypad with embedded-hal"

Mine's 4x4 tho

#

Wait let me check

#

Yes 4x4

coral geyser Aug 5, 2022, 10:29 PM

#

and keypad is 4 years old

wary cloak Aug 5, 2022, 10:29 PM

#

coral geyser Aug 5, 2022, 10:29 PM

#

which means it probably wont work nicely with your new embedded-hal

wary cloak Aug 5, 2022, 10:30 PM

#

It seems that keypad was the correct word

#

Why not have dependencies for something as normal as a matricial keyboard

#

They barely had for an lcd, the ecosystem for embedded rn is really small it seems

coral geyser Aug 5, 2022, 10:31 PM

#

Apparently, no one has needed it/wants to take the time to maintain a public one

wary cloak Aug 5, 2022, 10:31 PM

#

What do we do? Program it without library?

coral geyser Aug 5, 2022, 10:32 PM

#

looks like it

wary cloak Aug 5, 2022, 10:33 PM

#

Only two libraries one even tho updated 1 year ago(which is still quite some time) but for a another keyboard and also way less downloads than the other that's really old

wary cloak Aug 5, 2022, 10:33 PM

#

coral geyser looks like it

What a bad Possition-

#

It's a shame that rust a low level system programming has such an small embedded ecosystem when compared to the web development one for example

#

So I go out of crates.io and create the new project?

coral geyser Aug 5, 2022, 10:34 PM

#

wary cloak It's a shame that rust a low level system programming has such an small embedded...

We need more people

coral geyser Aug 5, 2022, 10:35 PM

#

wary cloak It's a shame that rust a low level system programming has such an small embedded...

maybe I will roll it into sketchbook

#

and the lcd stuff to

wary cloak Aug 5, 2022, 10:35 PM

#

coral geyser maybe I will roll it into sketchbook

A library for a matricial 4x4 keyboard?

coral geyser Aug 5, 2022, 10:35 PM

#

wary cloak A library for a matricial 4x4 keyboard?

My sketchbook crate is designed to mimic arduino programming

wary cloak Aug 5, 2022, 10:35 PM

#

coral geyser and the lcd stuff to

You plan to do a library with all you learnt?

#

You can ask me the code we made if you don't have it when you need it

coral geyser Aug 5, 2022, 10:42 PM

#

coral geyser maybe I will roll it into sketchbook

hmm I actually just finished redoing some of the traits in it. Maybe I should try it out on the arduino now

wary cloak Aug 5, 2022, 10:43 PM

#

The lcd?

#

Or ypu mean

#

Sketch in general

#

Btw I already made the project

coral geyser Aug 5, 2022, 10:43 PM

#

sketchbook

#

I haven't tried it on arduinos yet

wary cloak Aug 5, 2022, 10:44 PM

#

#

I created serial too because

#

We will need it at the very least to print to the terminal what key we got

#

First we should be able to tell the key that was pressed and after that make it a blocking function just like the Arduino's version waitForKey

#

Since we are using no library we can base in this code I have already sent where I detect the key pressed, do in a more beautiful rusty way ofc

#

I don't remember that well how it worked but you know C and Arduino so I don't have to explain (?

#

#include <stdio.h>

struct Key {

  byte id;
  char name[5];

};

const struct Key ONE   = {0b10001000, "1"};
const struct Key TWO   = {0b10000100, "2"};
const struct Key THREE = {0b10000010, "3"};
const struct Key KEY_A = {0b10000001, "A"};

const struct Key FOUR  = {0b01001000, "4"};
const struct Key FIVE  = {0b01000100, "5"};
const struct Key SIX   = {0b01000010, "6"};
const struct Key KEY_B = {0b01000001, "B"};

const struct Key SEVEN = {0b00101000, "7"};
const struct Key EIGHT = {0b00100100, "8"};
const struct Key NINE  = {0b00100010, "9"};
const struct Key KEY_C = {0b00100001, "C"};

const struct Key ASTRK = {0b00011000, "*"};
const struct Key ZERO  = {0b00010100, "0"};
const struct Key HASH  = {0b00010010, "#"};
const struct Key KEY_D = {0b00010001, "D"};

#define COLUMNAS 4
#define FILAS 4

const struct Key KEYPAD[FILAS][COLUMNAS] = {
  { ONE, TWO, THREE, KEY_A },
  { FOUR, FIVE, SIX, KEY_B },
  { SEVEN, EIGHT, NINE, KEY_C },
  { ASTRK, ZERO, HASH, KEY_D }
};

void setup() {
  DDRA = 0x0F;
  Serial.begin(9600);
}

void loop() {

  PORTA = 0b00001000;

  for (byte columna = 0; columna < COLUMNAS; columna++) {
    
    
    for (byte fila = 0; fila < FILAS; fila++) {
      
      if (PINA == KEYPAD[fila][columna].id) {
        char imprimir[25];
        sprintf(imprimir, "Se presionó la tecla %s", KEYPAD[fila][columna].name);
        Serial.println(imprimir);
        delay(200);
      }

    }

    PORTA >>= 1;
    
  }

}

#

But let me remember or try to explain how this worked

#

So I created a Struct Key that represents each key, one field is for say the ASCII name the character and the other for the combination of binary needed to be that number and create const instances of that struct to have all the possible keys instanciated

#

And I make a define for columns and rows, instead of just using 4, 2 two times, for reading purposes and that also makes the code more flexible to change here the number of columns and rows in each time I use it

#

In the setup I set the portA of the MEGA so I have the least significant bits as outputs and the rest as inputs

#

Because rows were inputs and columns outputs, i don't remember if it's that way of backwards tho but you get the idea of what I'm doing

#

And I'm also initializing the serial communication

#

Now here is where it gets tricky to remember...

#

I remember the base logic of

#

Moving the 1 in each column and see if it matches another 1

#

Because rows would be all 0 until someone presses it and made a 1

#

But columns I say what they are

#

And what's convenient is to move a 1 a column at a time

#

And then I know which key it is, surely you know how a matricial keyboard works anyways, but it's to say yeah that for loops are doing that, now let me see if I remember how..

#

Ah yes I kinda forgot to mention I also did a matrix for the matricial keyboard

#

Oh ok

#

I think of remember now, more or less

#

So first I initialize PORTA to 00001000

#

That one and the right 0 to that are the columns I control and move the bit around to ask

#

My inputs

#

As a programmer ofc

#

The output is the guy pressing down the button

#

So first I initiate a for loop for each column means it will run four times asking in each one of them, and then at the end of that for loop I move the 1 to the other column to keep asking what's inside

#

Now going one level deeper into the for loop

#

I have a for loop that will ask for each of the rows in the current column

#

And inside that for loop is where the comparing occurs

#

I ask if the current bits of the PORTA match with the id (bit combination needed and see that thanks to the for loops I ask in an specific could and row, to ask for an specific combination until it matches) in the keypad matrix which is of the type key, if it does I declare a char array to print it to the screen , and call sprintf to copy that string to imprimir and the I print it to serial monitor and add a delay, if it doesn't match I ask for the next row until I run out of them and ask for the next column and it's set of rows

#

Phew

#

Took me a little bit but I remember how it worked

#

How is it, could you understand my old code?

coral geyser Aug 5, 2022, 11:04 PM

#

yep

wary cloak Aug 5, 2022, 11:06 PM

#

Well should we replicate that or you know of a better way to do it?

#

I mean surely in rust there's a better way than in C fashion

coral geyser Aug 5, 2022, 11:09 PM

#

wary cloak I mean surely in rust there's a better way than in C fashion

We could do the same thing were we directly write to the registers, but I would recommend we do it manually with each pin

wary cloak Aug 5, 2022, 11:09 PM

#

To the registers?

coral geyser Aug 5, 2022, 11:11 PM

#

PORTA, ...

wary cloak Aug 5, 2022, 11:11 PM

#

I mean I just sayed hey key one this is your bit combination and then you know moved in the matrix with the column and rows variables and the for loop then asked if the PORTA matched that then the other

#

Oh

#

Why? Isn't it more comfortable that way? Because if not we would have to make 8 questions but for each possible key

#

Like if this pin is 0 and this one is 1 and that one is also 1 and the other is also 0 ..

#

And so

coral geyser Aug 5, 2022, 11:12 PM

#

We loose the type safety rust provides

wary cloak Aug 5, 2022, 11:13 PM

#

Doesn't embedded hal has a safe way of doing that , is that operation by definition unsafe? Why?

#

And it's worth being a lot more verbose?

coral geyser Aug 5, 2022, 11:14 PM

#

The operation is unsafe because it changes the state of the pins and the mode of the pins

wary cloak Aug 5, 2022, 11:14 PM

#

Btw sorry I'm going to shop I'm back in 5 minutes it's close

coral geyser Aug 5, 2022, 11:14 PM

#

wary cloak And it's worth being a lot more verbose?

This question could go either way. We can do either

wary cloak Aug 5, 2022, 11:15 PM

#

coral geyser The operation is unsafe because it changes the state of the pins and the mode of...

No because there's one for the state of the pins and another for the bit in the pins, in setup I change only once the state because it doesn't need to be changed again and the I just once write the starting combination, move only that bit and ask for the whole port instead of every bit in all 8 pins seems so much verbose and unnecessary work tho idk how it would be

#

DDRA sets inputs and outputs and PINA is for read/write

coral geyser Aug 5, 2022, 11:16 PM

#

wary cloak No because there's one for the state of the pins and another for the bit in the ...

yeah, it's unsafe from a type perspective

#

because you bypass the types which is fine to do, if you do it right

wary cloak Aug 5, 2022, 11:17 PM

#

You mean I can write a 1 to an output which I shouldn't be able to set a 1 to?

#

I would guess is that

coral geyser Aug 5, 2022, 11:17 PM

#

wary cloak ```rust #include <stdio.h> struct Key { byte id; char name[5]; }; const ...

Also if a remember the avr register defaults correctly this can cause a short circuit if you press 2 buttons at once

wary cloak Aug 5, 2022, 11:33 PM

#

I'm back

wary cloak Aug 5, 2022, 11:34 PM

#

coral geyser Also if a remember the avr register defaults correctly this can cause a short ci...

Well I didn't have to think about multi pressing at the time, but I read it was one of the features of the library

#

Tho what matters now is if we choose the register or individual pins way

#

The thing that concerns me when working with individual pins for things like that is that I know I'm writing +80 lines of could that could be sum up

#

It just seems like so much extra work, that makes me doubt

coral geyser Aug 5, 2022, 11:42 PM

#

you get to choose 🤷‍♂️

wary cloak Aug 5, 2022, 11:43 PM

#

Tell me, am I right or it isn't that bad?

#

Maybe I'm exaggerating the downside

coral geyser Aug 5, 2022, 11:44 PM

#

individual pins: Rust's type system will help you but will be more verbose,
using PORTA, ... : probably shorter code, but you will have to interact with unsafe Rust

wary cloak Aug 5, 2022, 11:45 PM

#

I mean having experience with unsafe rust would be interesting but maybe is too much for a begginer

#

What would you do? Isn't it kind of our objective to avoid verbose options?

coral geyser Aug 5, 2022, 11:46 PM

#

I would use individual pins, unless there were other constraints. My default is always no unsafe unless necessary

wary cloak Aug 5, 2022, 11:47 PM

#

Could we maybe build our own safe PORTA alternative and that? Like a struct or smth?

coral geyser Aug 5, 2022, 11:47 PM

#

we could

#

definitely

wary cloak Aug 5, 2022, 11:47 PM

#

Should we?

coral geyser Aug 5, 2022, 11:48 PM

#

I would just make a Keypad struct that handles the keypad

wary cloak Aug 5, 2022, 11:48 PM

#

Well ig

#

Ok shall we finally start

coral geyser Aug 5, 2022, 11:50 PM

#

whenever, I am just working on sketchbook on the side

wary cloak Aug 5, 2022, 11:50 PM

#

I mean, what would be the first step, create a Keypad module?

coral geyser Aug 5, 2022, 11:51 PM

#

wary cloak I mean, what would be the first step, create a Keypad module?

that would be a good first step

wary cloak Aug 5, 2022, 11:51 PM

#

Done

#

Now what? Create the Keypad Display that will do all the work just like in the original library we had a Keypad class which from we would create a keypad object with crucial information in it's constructor?

coral geyser Aug 5, 2022, 11:53 PM

#

do we need a Display struct in this version of the project?

wary cloak Aug 5, 2022, 11:53 PM

#

Sorry

#

Keypad attic

#

Struct*

coral geyser Aug 5, 2022, 11:53 PM

#

oh, yeah

#

make a Keypad struct

#

what do you think the data in the struct will be?

wary cloak Aug 5, 2022, 11:54 PM

#

Mmmm

#

Well let's see

#

The information that the library needed to function was

#

The number of columns and rows, which pins went for each, the matrix that was converted to a string with makeKeyMap..

#

Tho those were parameters in the constructor

#

In my Basically C code I had the bit combination and the ASCII character, the matrix and number of Columns and Rows were also needed

coral geyser Aug 5, 2022, 11:57 PM

#

can we make the assumption that we will only be working with a 4x4 keypad for this project?

wary cloak Aug 5, 2022, 11:58 PM

#

Ofc tho I needed them in my C code to iterate and because it was readable, the original library no clue

#

I mean I can just iterate four times but it is easier to say I'm iterating over the columns and each row of them

#

Which takes btw

#

Is there a define here?

#

Because it makes things so readable and sometimes comfortable to change a value in just one place and not all

coral geyser Aug 6, 2022, 12:00 AM

#

wary cloak Because it makes things so readable and sometimes comfortable to change a value ...

We can do better

wary cloak Aug 6, 2022, 12:01 AM

#

That means it doesn't exist(?

coral geyser Aug 6, 2022, 12:01 AM

#

cols: [T; 4],
...
for col in cols {
  // col is T
}

coral geyser Aug 6, 2022, 12:01 AM

#

wary cloak That means it doesn't exist(?

Not in the same way in rust they would be const COL_NUM: usize = 4;

wary cloak Aug 6, 2022, 12:02 AM

#

Well so what would be the struct fields?

coral geyser Aug 6, 2022, 12:05 AM

#

wary cloak The number of columns and rows, which pins went for each, the matrix that was co...

try adding these as fields see how far you get

wary cloak Aug 6, 2022, 12:06 AM

#

What would be the type of a matrix?

coral geyser Aug 6, 2022, 12:07 AM

#

[[T; X]; Y]

#

T being the value to store, X and Y are the sizes

wary cloak Aug 6, 2022, 12:17 AM

#

Eh..

#

I didn't understand at all

#

Ik that a matrix is an array of array

#

So is an array with two [][]

#

And the two of them hold intergers for the index

#

At the type of an array at least in see is int* or char* an so

wary cloak Aug 6, 2022, 12:18 AM

#

coral geyser `[[T; X]; Y]`

I don't understand at all this

coral geyser Aug 6, 2022, 12:20 AM

#

?eval ```rust
let x: [[i32; 3]; 2] = [
[1, 2, 3],
[4, 5, 6],
];

dbg!(x);

robust mountainBOT Aug 6, 2022, 12:20 AM

#

[src/main.rs:7] x = [
    [
        1,
        2,
        3,
    ],
    [
        4,
        5,
        6,
    ],
]

()

wary cloak Aug 6, 2022, 12:20 AM

#

#

What?

coral geyser Aug 6, 2022, 12:20 AM

#

[T; N] is an array

coral geyser Aug 6, 2022, 12:20 AM

#

wary cloak

struct shouldn't be capital

wary cloak Aug 6, 2022, 12:20 AM

#

Why ;?

coral geyser Aug 6, 2022, 12:21 AM

#

?eval ```rust
Struct A;

robust mountainBOT Aug 6, 2022, 12:21 AM

#

error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `A`
 --> src/main.rs:2:8
  |
2 | Struct A;
  |        ^ expected one of 8 possible tokens

coral geyser Aug 6, 2022, 12:21 AM

#

?eval ```rust
struct A;

robust mountainBOT Aug 6, 2022, 12:21 AM

#

()

wary cloak Aug 6, 2022, 12:21 AM

#

So we have [[]] as an array of arrays in the first array we need it's size [[]Y]

#

And in the second we also need it's size

#

Like any array

coral geyser Aug 6, 2022, 12:22 AM

#

yep

wary cloak Aug 6, 2022, 12:22 AM

#

[[X]Y]

#

First off

#

Why the separation with ;

coral geyser Aug 6, 2022, 12:23 AM

#

wary cloak Why the separation with ;

its just how the syntax is

wary cloak Aug 6, 2022, 12:24 AM

#

To separate elements in an array or what?

coral geyser Aug 6, 2022, 12:25 AM

#

wary cloak To separate elements in an array or what?

?eval ```rust
let x = [1, 2, 3];
let y = [0; 3];
let z: [i32; 3] = [1, 2, 3];
dbg!(x, y, z);

robust mountainBOT Aug 6, 2022, 12:25 AM

#

[src/main.rs:5] x = [
    1,
    2,
    3,
]
[src/main.rs:5] y = [
    0,
    0,
    0,
]
[src/main.rs:5] z = [
    1,
    2,
    3,
]

()

coral geyser Aug 6, 2022, 12:26 AM

#

[A; B] is read as "array of A with length B"

#

in type position A is a type

#

in expression position A is a value

wary cloak Aug 6, 2022, 12:26 AM

#

Why the first array has generic type and Y doesn't have a generic type?

#

And also why a generic type if we know we are storing ASCII

coral geyser Aug 6, 2022, 12:27 AM

#

wary cloak Why the first array has generic type and Y doesn't have a generic type?

In a nesting [[T; X]; Y] the outer array (of size Y) has a element type of [T; X]

wary cloak Aug 6, 2022, 12:27 AM

#

Oooh

#

I see it makes sense

coral geyser Aug 6, 2022, 12:27 AM

#

wary cloak And also why a generic type if we know we are storing ASCII

It's for explanation, you should fill it in with whatever you need

wary cloak Aug 6, 2022, 12:28 AM

#

We leave it as T or know that I know I type char there?

coral geyser Aug 6, 2022, 12:28 AM

#

wary cloak We leave it as T or know that I know I type char there?

what do you want?

#

you get to pick

wary cloak Aug 6, 2022, 12:29 AM

#

Well a char because it can't be anyother value

#

so this would be th struct

#

struct Keypad {
    columns: u8,
    rows: u8,
    pins: u8,
    matrix: [[char; X]; Y]
}

#

Is it fine that way?

coral geyser Aug 6, 2022, 12:29 AM

#

should X and Y be actual values also?

wary cloak Aug 6, 2022, 12:30 AM

#

Well we know this a 4x4 matrix

#

The size is know and won't change

#

this is a*

#

So maybe we could instead of X and Y just do 4

#

Or do the define like syntax to make it more readable

#

I guess X and Y would be fields if I needed to know what kind of matricial keyboard is

#

Like the other library that takes it as parameters

coral geyser Aug 6, 2022, 12:33 AM

#

try out what you think is best for the moment

wary cloak Aug 6, 2022, 12:34 AM

#

Mmmm

#

It would be like lying to pass as parameters X and Y

#

Because I would be saying

#

Hey pass as parameters which keyboard is it

#

When it will only accept one answer

#

So to avoid mistakes or just being tidy

#

If it can only be one thing then why ask what it is

#

So we should set it to be only a 4x4 to work for this project as you suggested

#

If we are in the mood later and make it generic that would be cool

#

Anyways I'm having dinner, coming back soom

#

Soon*

wary cloak Aug 6, 2022, 1:07 AM

#

I'm back

#

So

#

Should the signature change to?

#

struct Keypad {
    columns: u8,
    rows: u8,
    pins: u8,
    matrix: [[char; 4]; 4]
}

old mango Aug 6, 2022, 1:09 AM

#

Looks abt right to this occasional observer

wary cloak Aug 6, 2022, 1:09 AM

#

Thanks for the appreciation

#

Mmm well having the structure..

#

Wait now that I think about it..

#

What would columns and rows store?

#

The number of them? Which I said why that wouldn't make sense

#

Or the pins associated with them

#

Then in that case

#

Pins is not necessary

#

But rather a bit combination maybe

#

Like in my c code

#

I could also have a separate struct for a key that could be inside this Keypad struct also that could manage that..

#

Ok I will leave it here so I don't forget

#

Since rows and columns are default information

#

The fields should be what pins are the ones for rows and columns so, maybe change the name?

#

Also get rid of pins field

#

And create the same struct key that contains the name meaning the ASCII character, and the id being the bit combination needed, and the key struct would also be inside the keypad struct or something similar

coral geyser Aug 6, 2022, 1:42 AM

#

Where are we putting the pins that the Keypad struct will control?

wary cloak Aug 6, 2022, 1:43 AM

#

In the columns and row fields because it's important to know, because the columns we have to move the bit with 1 and in rows we needed to check if it was pressed

#

But maybe change the name to column_pins
row_pins

coral geyser Aug 6, 2022, 1:44 AM

#

wary cloak In the columns and row fields because it's important to know, because the column...

I mean where are we storing the things that lets us change the pin's state

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