There is a new discovery (successful) on using the PB8 pin of STM32G431CBT6 as I2C

bigbat

There is a new discovery (successful) on using the PB8 pin of STM32G431CBT6 as I2C [Copy link]

"The PB8-BOOT0 pin of my board STM32G431CBT6 is designed to connect to the AT24C08 device, but PB8 defaults to the BOOT0 function. I used STM32CubeMX to generate the program, but it does not work properly. Even if I2C is not used as GPIO output, it does not work. I did the same experiment as @damiaa in the forum, and the results are: no matter how the PB8 status is set in the program, PB8 is 0, which is GND. In order to make the system work, my system PB8 uses tool software to set nSWBOOT0=0, BOOT0=0; only in this way can my board work, otherwise the program cannot be burned. I would like to ask for guidance from all the experts. If anyone can contact ST engineers, please give feedback to the original manufacturer. Thank you very much!"

I found today that I can work if I change the settings of STM32CubeMX to the following.

damiaa

Thanks for sharing

wangerxian

Will it work properly if it is set to hardware IIC?

bigbat

wangerxian posted on 2022-12-14 10:19 Can it work normally if it is set to hardware IIC?

There are also OB settings, BOOT0 = 0; swBOOT0 = 0;

秦天qintian0303

It's really okay. I try not to touch this kind of pins. Don't take risks.

taxi12139

Enthusiastic reply, like, and support, just for points, come on

bigbat

Qintianqintian0303 posted on 2022-12-14 11:30 It's really good. I try not to touch this kind of pins. I don't take risks.

If I had enough pins, I wouldn't touch them.

starcat123

So, the key is to configure the pins to "high speed mode"?

freebsder

It’s better not to touch these feet, because if something goes wrong, all you can do is cry.

bigbat

freebsder posted on 2022-12-29 15:00 It’s better not to touch these feet. Once something goes wrong, all you can do is cry.

There is no other solution, or you can just replace the chip. There are only so many pins, so it might be better to use it as GPIO.