How do you control the GPIO pins on an STM32MP1?

[msche.1]

Is micro python an option?

[Olivier GALLIEN]

Hi @msche.1​ ,

There's already several posts addressing this question.

I found for you How to code to control GPIO from python (st.com)

Don't hesitate to browse this community and the stm32mpu wiki.

Hope it help,

Olivier

[msche.1]

Thanks for the link, I have found that exact post, but I didn't find a way to figure out the mapping from (gpiochipX, line) to PIN. Do you know where I can find this mapping?

[Kevin HUBER · Accepted solution]

Hello @msche.1​ ,

As explained on the wiki you can displays information and controls the gpiochip line with "gpiodetect", "gpioinfo", "gpioget", etc: https://wiki.st.com/stm32mpu/wiki/How_to_control_a_GPIO_in_userspace

The mapping of the GPIO is available in the datasheet, from page 93:

https://www.st.com/resource/en/datasheet/stm32mp157c.pdf

If you want the information of pin PA8 for example, you can first do a:

root@stm32mp1:~# gpiodetect
gpiochip0 [GPIOA] (16 lines)
gpiochip1 [GPIOB] (16 lines)
gpiochip2 [GPIOC] (16 lines)
gpiochip3 [GPIOD] (16 lines)
gpiochip4 [GPIOE] (16 lines)
gpiochip5 [GPIOF] (16 lines)
gpiochip6 [GPIOG] (16 lines)
gpiochip7 [GPIOH] (16 lines)
gpiochip8 [GPIOI] (16 lines)
gpiochip9 [GPIOZ] (16 lines)

You see that GPIOA is gpiochip0:

Then you can use:

root@stm32mp1:~# gpioget gpiochip0 8
0

Same thing with gpioset.

Regards,

Kevin

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