STM32C011J4M - issue with pin overlapp

[engeneering_sockpuppet]

Hello to whom this might concern,

I was recently experimenting with STM32C011J4M for a small hobby project (I am trying to fit into a about coin size) and want to comunnicate with other chip over I2C. Due the size of the package I cannot use debugging to find core of the issue, so I used multimeter and legs 4 to 7 as signal outputs. 

I let CubeMx to generate signal configuration and try to use PA8 as output signal (overlaping with PA11[PA9]). The resulting behavior is that the physical leg 4 is stuck on 1.2V and output is not detectable. If I leave PA11 set as analog-nopull, but remove PA11 from 'HAL_SYSCFG_SetPinBinding' the output becomes readable.

From rading on the other pins, I can see, that the communication doesn't work. The I2C is also on overlaping pins (default generation put the pins on PC14[leg 1] and PB6[leg8], which also overlaps with programming connections). I try to communicate with lp5817 and am wondering, if I should also remove pins PB7, PA14 and PC15 form 'HAL_SYSCFG_SetPinBinding' for communication to start working, or if I should look for the mistake somewhere else?

Thank you for the response in advance and best regards,

Martin

[drakeshawn · Accepted solution]

Fix CubeMX by removing all the pin overlaps and using only valid STM32C011J4M I2C pins, then regenerate code don’t manually edit SYSCFG.

[engeneering_sockpuppet]

Thanks for the response, but I am unsure, where in the cubeMX do I do that. I attached ioc file, which generated me the non-working code. I touched only parts, I'll need to use, but this led to non-working behaviour described above.

[engeneering_sockpuppet]

In the end I needed to change gpio.c, for all to work.