Random RXLoss and RSSI drop | ExpressLRS Community | Page 1

vernal hound Apr 15, 2024, 7:53 PM

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I recently bought a Happymodel Crux35 and have had an issue where at complete random, I'll get RXLoss and my RSSI will drop to -130. I don't regain connection until I replug in the battery. I also get occasional Telemetry loss, but it comes back immediately. Radio is TX12 MKII with built-in ELRS. I've tried updating BF to no avail.

signal imp Apr 15, 2024, 7:55 PM

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What receiver?

vernal hound Apr 15, 2024, 7:57 PM

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Crazyf411 built in UART ELRS reciever

signal imp Apr 15, 2024, 7:59 PM

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Post a CLI dump and the output of status

vernal hound Apr 15, 2024, 8:00 PM

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I'm at work, I will in a few hours, thank you!

vernal hound Apr 15, 2024, 11:11 PM

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Here is the dump and status outputs

📎 status.txt 📎 dump.txt

signal imp Apr 15, 2024, 11:15 PM

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vernal hound Here is the dump and status outputs

CPU usage is quite high, even with a 4k PID loop and DShot 300. Save a diff and flash Betaflight 4.4.3 or 4.5

vernal hound Apr 15, 2024, 11:26 PM

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Flashed 4.4.3, CPU load in BF sits at 31%. Is that better?

signal imp Apr 15, 2024, 11:27 PM

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Yes, you were at 60% before

vernal hound Apr 15, 2024, 11:28 PM

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Upon loading the old backup, my CPU load sits at 60% again

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Is there anything that could be eating at it?

signal imp Apr 15, 2024, 11:32 PM

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Type tasks in the CLI twice, and post the output from the second time

vernal hound Apr 15, 2024, 11:33 PM

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📎 tasks.txt

signal imp Apr 15, 2024, 11:35 PM

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vernal hound

Just PID and filter, that's normal

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Reflash the receiver via Betaflight Passthrough

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What ELRS version and regulatory domain are you using?

vernal hound Apr 16, 2024, 12:05 AM

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3.0.1, ISM

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Should I update to 3.3.2?

signal imp Apr 16, 2024, 12:10 AM

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Yes

vernal hound Apr 16, 2024, 12:37 AM

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Whenever I put my FC into DFU mode to flash it, it doesn't show up as a COM port, instead as a USB device

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signal imp Apr 16, 2024, 12:40 AM

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vernal hound Whenever I put my FC into DFU mode to flash it, it doesn't show up as a COM port...

That is normal

vernal hound Apr 16, 2024, 12:40 AM

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I can't select it as a device in ELRS Configurator though

signal imp Apr 16, 2024, 12:42 AM

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DFU mode is only for updating Betaflight

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Follow the flashing guide to update your receiver: https://www.expresslrs.org/quick-start/receivers/hmep2400/#via-passthrough

Happymodel EP - ExpressLRS

ExpressLRS aims to provide the best completely open, high refresh radio control link while maintaining a maximum achievable range at that rate with low latency. Vast support of hardware in both 900 MHz and 2.4 GHz frequencies.

vernal hound Apr 16, 2024, 12:50 AM

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BF Passthrough kept erroring out, so I updated both my receiver and transmitter to 3.3.2 through wifi. However, Betaflight isn't getting anything in the reciever tab, despite rx and tx being bound

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my reciever serial rx is on

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signal imp Apr 16, 2024, 12:57 AM

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vernal hound BF Passthrough kept erroring out, so I updated both my receiver and transmitter ...

What error? Post the !log

warm roostBOT Apr 16, 2024, 12:57 AM

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See the following image to save a log file from the configurator

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https://cdn.discordapp.com/attachments/798006228450017290/1025339571979960340/LogSaveToFile.jpg

vernal hound Apr 16, 2024, 12:59 AM

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Before I updated to 3.3.2 it'd hang on connecting before erroring out, but when I try to reflash I get this

📎 ExpressLRSBuildLog_20240416005858458.txt

signal imp Apr 16, 2024, 1:03 AM

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vernal hound Before I updated to 3.3.2 it'd hang on connecting before erroring out, but when ...

This says you don't have a port set to SerialRX on the ports tab in Betaflight

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Try flashing via Passthrough again

vernal hound Apr 16, 2024, 1:05 AM

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signal imp This says you don't have a port set to SerialRX on the ports tab in Betaflight

Yeah, I turned it off on accident. Still erorring out trying to flash via passthrough, but now I get this:

📎 ExpressLRSBuildLog_20240416010528149.txt

signal imp Apr 16, 2024, 1:06 AM

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Show a clear photo of your FC

vernal hound Apr 16, 2024, 1:13 AM

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signal imp Apr 16, 2024, 1:21 AM

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vernal hound

Disable Telemetry in Betaflight, unplug USB, hold down boot button, plug in USB, open Betaflight, click "exit DFU mode", close Betaflight, click flash in ELRS Configurator

vernal hound Apr 16, 2024, 1:30 AM

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no change, same timeout error

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I may add that, in trying to fix this error before, this (BF not getting anything from the reciever) has happened before, but frankly it fixed itself after throwing myself at it enough and I don't know what I did ¯_(ツ)_/¯

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Thank you for your help, though

vernal hound Apr 16, 2024, 2:13 AM

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Update, I reflashed BF 4.2.2 it's communicating with BF again

vernal hound Apr 16, 2024, 6:32 PM

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RXLOSS still happens.

signal imp Apr 16, 2024, 6:34 PM

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Have you reflashed the receiver?

vernal hound Apr 16, 2024, 6:35 PM

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yes

signal imp Apr 16, 2024, 6:35 PM

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Can you show the flashing log?

signal imp Apr 16, 2024, 6:36 PM

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vernal hound Update, I reflashed BF 4.2.2 it's communicating with BF again

4.4.2?

vernal hound Apr 16, 2024, 6:37 PM

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Betaflight.

vernal hound Apr 16, 2024, 6:37 PM

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signal imp 4.4.2?

yes, sorry

vernal hound Apr 16, 2024, 6:37 PM

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signal imp Can you show the flashing log?

Don't have it anymore, I can reflash if needed

signal imp Apr 16, 2024, 6:38 PM

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Please do

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Try this: Flash via Betafight passthrough with "erase before flash" checked

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It should fail, post the log

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Then flash again without "erase before flash" checked

vernal hound Apr 16, 2024, 6:40 PM

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with it checked

📎 eraselog.txt

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without

📎 noeraselog.txt

signal imp Apr 16, 2024, 6:40 PM

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No CLI available. Already in passthrough mode?, If this fails reboot FC and try again!

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Unplug everything, plug in USB, and try again

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ELRS Configurator can't talk to Betaflight

vernal hound Apr 16, 2024, 6:41 PM

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📎 newerror.txt

signal imp Apr 16, 2024, 6:42 PM

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vernal hound

It flashed successfully yesterday?

vernal hound Apr 16, 2024, 6:42 PM

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Through wifi, yes

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not through passthrough. It's never worked through passthrough

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always get the same timing out-type error

signal imp Apr 16, 2024, 6:43 PM

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If you can't reflash via Passthrough that suggests a wiring problem between the FC and receiver

vernal hound Apr 16, 2024, 6:44 PM

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But it's an AIO?

signal imp Apr 16, 2024, 6:45 PM

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Yes, show the other side of the FC

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Do you have any shorts in this area?

vernal hound Apr 16, 2024, 6:49 PM

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signal imp Do you have any shorts in this area?

VIN and 5V are awfully close, I can reflow it, but besides that not that I can tell

signal imp Apr 16, 2024, 6:49 PM

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Show a clear photo of the FC

vernal hound Apr 16, 2024, 6:49 PM

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Mhm, gimme a moment

signal imp Apr 16, 2024, 6:52 PM

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Is there solder on the u.fl?

vernal hound Apr 16, 2024, 6:54 PM

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signal imp Is there solder on the u.fl?

No, it was some sort of adhesive from the factory. I've picked some it off bu some remains

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signal imp Apr 16, 2024, 6:56 PM

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vernal hound

This side looks fine

signal imp Apr 16, 2024, 6:56 PM

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vernal hound

It's ok, if they were shorted you wouldn't have video

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I don't see anything obviously wrong. I'm leaning towards a hardware issue.

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If you have a !ftdi adapter you can reflash using that

warm roostBOT Apr 16, 2024, 6:57 PM

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Here are some examples of FTDI (USB-UART) adapters that can be used to flash ELRS hardware:
https://a.co/d/6irgzsO
https://www.racedayquads.com/products/betafpv-expresslrs-recovery-dongle

signal imp Apr 16, 2024, 6:57 PM

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Use the ER/ET pads as described on the product page: https://www.happymodel.cn/index.php/2023/02/07/happymodel-crazyf411-elrs-aio-4in1-flight-controller-built-in-uart-2-4g-elrs-and-20a-esc-for-toothpick/

Happymodel

Jason

Happymodel CrazyF411 ELRS AIO 4in1 Flight controller built-in UART ...

*”ET” and “ER” pads are used for communication with ESP8285, you can connect “TX” of FTDI tool to “ET” pad and connect “RX” of FTDI tool to “ER” pad for upgrade onboard UART ELRS receiver firmware. Need to short connect “+5V” and “E5” pads before that. The CrazyF411 ELRS flight controller comes with integrated UART…

vernal hound Apr 16, 2024, 6:58 PM

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What's the issue flashing over wifi?

signal imp Apr 16, 2024, 6:58 PM

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If the problem is a corrupted flash partition on the receiver, flashing via WiFi will not overwrite it

vernal hound Apr 16, 2024, 7:01 PM

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So next course of action is to get a FTDI dongle?

signal imp Apr 16, 2024, 7:02 PM

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You tried the recovery flash procedure?

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Unplug USB, hold down the receiver boot button, plug in USB, and flash?

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Failing that, I would try via FTDI. They're like $6

vernal hound Apr 16, 2024, 7:03 PM

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signal imp Unplug USB, hold down the receiver boot button, plug in USB, and flash?

yeah got the same error iirc

vernal hound Apr 16, 2024, 7:03 PM

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signal imp Failing that, I would try via FTDI. They're like $6

okay, thank you!

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I'll give recovery flashing again as the button is hard to press and I may have not done it correctly

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Booted it into recovery mode (solid green LED) and same error still, oh well.
Would there be any way to use a RPI pico or similar for an RFDI device, or do I have to bite the bullet and just buy something like the betafpv one

signal imp Apr 16, 2024, 7:10 PM

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Just get a FTDI adapter

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they are cheap

vernal hound Apr 16, 2024, 7:11 PM

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Alright, ty!

vernal hound Apr 17, 2024, 1:53 AM

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I have a serial-to-usb adapter, which from what I can tell is no different to any FTDI device online. upon seeing the serial output after bridging +5v and E5, it's complete nonsense.

signal imp Apr 17, 2024, 1:53 AM

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Follow the instructions to flash via UART

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Put the receiver into bootloader mode first

vernal hound Apr 17, 2024, 2:19 AM

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Consistently times out trying to flash, serial console doesn't show anything while in bootloader mode

signal imp Apr 17, 2024, 2:19 AM

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Show your wiring and the !log

warm roostBOT Apr 17, 2024, 2:19 AM

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See the following image to save a log file from the configurator

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https://cdn.discordapp.com/attachments/798006228450017290/1025339571979960340/LogSaveToFile.jpg

vernal hound Apr 17, 2024, 2:24 AM

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Red is RX, Brown is TX. I've also tried reversing them to no avail

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📎 ExpressLRSBuildLog_20240417022224929.txt

signal imp Apr 17, 2024, 2:46 AM

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Use soldered connections

vernal hound Apr 17, 2024, 3:47 AM

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Still the same result.

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not the greatest soldering job, but nothing is shorting out.

vernal hound Apr 17, 2024, 11:03 PM

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Is the consenous to buy a new board, or?

vernal hound Apr 18, 2024, 1:15 AM

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Betaflight is still recieving connection to the ELRS module despite the pads being bridged.

vernal hound Apr 18, 2024, 2:03 AM

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tried a different usb to serial adapter, no change still

#Random RXLoss and RSSI drop