potent coral
I'm trying to get the ADC to return somewhat plausible values, but they don't change at all. I've attached the current config.
VBat is on PC5, IBat is on PA5. I can use either ADC1 or ADC2 for those.
Symptom: Both values are stuck at unreasonable values, BF configurator shows 13.2 V and 24.8 A when powered from USB. VBat doesn't change when I short the battery pads (should report close to zero) or when I apply 5 V to the positive battery pad.
my DMA OPT might be wrong, trying with 9
nope, something else might be missing
velvet hinge
Can you post the output of dma show and a full CLI dump?
potent coral
@velvet hinge sorry for the delay. I don't know why.
# dma show
Currently active DMA:
--------------------
DMA1 Stream 0: DSHOT_BITBANG 3
DMA1 Stream 1: SPI_SDO 3
DMA1 Stream 2: SPI_SDI 3
DMA1 Stream 3: SPI_SDO 4
DMA1 Stream 4: SPI_SDI 4
DMA1 Stream 5: FREE
DMA1 Stream 6: FREE
DMA1 Stream 7: FREE
DMA2 Stream 0: FREE
DMA2 Stream 1: FREE
DMA2 Stream 2: FREE
DMA2 Stream 3: FREE
DMA2 Stream 4: FREE
DMA2 Stream 5: FREE
DMA2 Stream 6: FREE
DMA2 Stream 7: FREE
dry rover
https://github.com/crteensy/yolo-chonker/blob/main/ultimateFC.pdf
We need to address:
// #define ADC_VBAT_PIN
// #define ADC_RSSI_PIN
// #define ADC_EXTERNAL1_PIN
Also we need to define:
//TODO Timer mapping
//TODO DMA options
Also probably need ADC1 or ADC3
#define ADC1_DMA_OPT ???
velvet hinge
Yeah, ADC DMA isn't being assigned
potent coral
Yeah, ADC DMA isn't being assigned
is that done via ADC1_DMA_OPT ?
velvet hinge
is that done via ADC1_DMA_OPT ?
Yes. You can also try:dma ADC 1 0 in the CLI and see if that works.
potent coral
Yes. You can also try:`dma ADC 1 0` in the CLI and see if that works.
# dma ADC 1: changed from NONE to 0
Currently active DMA:
--------------------
DMA1 Stream 0: DSHOT_BITBANG 3
DMA1 Stream 1: SPI_SDO 3
DMA1 Stream 2: SPI_SDI 3
DMA1 Stream 3: SPI_SDO 4
DMA1 Stream 4: SPI_SDI 4
DMA1 Stream 5: FREE
DMA1 Stream 6: FREE
DMA1 Stream 7: FREE
DMA2 Stream 0: FREE
DMA2 Stream 1: FREE
DMA2 Stream 2: FREE
DMA2 Stream 3: FREE
DMA2 Stream 4: FREE
DMA2 Stream 5: FREE
DMA2 Stream 6: FREE
DMA2 Stream 7: FREE```Did you save?
potent coral
of course not
velvet hinge
😅
potent coral
Currently active DMA:
--------------------
DMA1 Stream 0: ADC 1
DMA1 Stream 1: DSHOT_BITBANG 3
DMA1 Stream 2: SPI_SDO 3
DMA1 Stream 3: SPI_SDI 3
DMA1 Stream 4: SPI_SDO 4
DMA1 Stream 5: SPI_SDI 4
DMA1 Stream 6: FREE
DMA1 Stream 7: FREE
DMA2 Stream 0: FREE
DMA2 Stream 1: FREE
DMA2 Stream 2: FREE
DMA2 Stream 3: FREE
DMA2 Stream 4: FREE
DMA2 Stream 5: FREE
DMA2 Stream 6: FREE
DMA2 Stream 7: FREE
shorting the battery pads still doesn't pull the indicated voltage towards zero. it's stuck at 27.01 V
velvet hinge
What voltage do you measure on pins A05 and C05?
potent coral
I can't do that right now - but if it's electrically ok then those should measure 0V. I'll give you those values as soon as i can
or at least the value in BF should change a bit when I apply a small voltage to the battery input pad
velvet hinge
Is the current sense pad broken out, or is this an AIO?
potent coral
the Yolo is an AIO
that's why I sent out chonkers (dev FCs without anything really fixed), the guys can do everything with those
velvet hinge
For the heck of it, can you enter this in the CLI also:
dma ADC 3 8
set adc_device = 3
save```It looks like the H7 has some internal sensors (temp, Vref) that use ADCs also but I haven't looked deeper
The above is just assigning DMA to all of the ADC channels, and moving the curr and vbat adcs to channel 3
Just cribbing from hydra's H7RF target
velvet hinge
If you apply voltage does it go up?
potent coral
I think I should set that up properly before I do something really bad
but I saw the indicated value change when I reset the MCU
so something is happening indeed
velvet hinge
If you change the resource mappings for resource ADC_BATT 1 and resource ADC_CURR 1 to different pins how much do the values change? Do they change on reboot? ie I'm wondering if the pins are NC/floating
potent coral
I set the pin for ADC_BATT to the USB voltage sensing pin. after reboot, I see the indicated voltage rise to a final value of 61.91 V
the scaling is wrong for that, of course
I need to sleep, fighting a light pneumonia. only took my doctor 1.5 weeks to figure that out...
potent coral
I am
good night! I'll attach some more stuff tomorrow so that we have a better chance at debugging VBat
potent coral
There we go
@velvet hinge @dry rover
supplied by a bench PSU, set to 7 V with a 0,2 A current limit. current drawn: 100 mA (a bit much!?)
the voltage I can measure at the voltage divider is 0.63 V (1/11th of the supply voltage, consistent with a 10k/1k divider)
reported voltage is wrong and does not change when I set the PSU to, say, 10 V
I also notice an inconsistency between the number of cells reported in the configurator's top bar and in the "Power & Battery" tab
what I also find surprising is that "mAh used" doesn't increase from zero despite the rather high calculated current of almost 328 A
it should be through the roof already
reported voltage doesn't change after switching off the bench PSU
sidenote: I can't measure the voltage directly at the MCU (smaller circle, top right), because it's a BGA. I measured at the divider/filter cap (bottom)
potent coral
Has anyone tried anything with their chonker?
potent coral
@round spade this is the forum thread
round spade
Yo!
Hi! I dont' have much context for what's going wrong, but H7s use an (almost?) identical ADC peripheral as other STM32s. Steps are in the RM. Here's the register-level code I use:
https://github.com/David-OConnor/stm32-hal/blob/main/src/adc.rs
In particular, see section 28.4.16
Highlights: To setup, Enable the RCC periph clock, enable advregen, perform a calibration per the RM (This is a little involved), and set the appropriate config settings like differential if applicable, continuous mode etc, eg in the CFGR register
Set up the SEQR register as required for multi-channel sequences
To do a one-shot reading, set up the sequence, then set the ADSTART bit in the CR register. Wait until EOS is clear. Then read the DR register for the result
See the RM for details on timer triggers and DMA
I would start with a simple program that sets up the ADC in one-shot mode, and takes a single channel reading, and see if it makes sense adn matches a voltmeter
Then start DMA, sequences etc
potent coral
I think this should all be done in BF already because the H735 shares a RM with the 730 (which seems to work)
round spade
Concur
