How to Drive LED on the STM32MP157C-Dk2 by STLinux Shell ?

[Sisyphus38]

Hello,

I am completely newby on embedded linux stuffs.

Can any one tell me how to drive any available LED on the STM32MP157C-Dk2 board by using the linux shell commands.

Unfortunatelly i did not find the information on the wiki stm32mcu.

Thank you by advance.

[PatrickF]

Hello,

maybe this will help : https://community.st.com/s/article/FAQ-STM32MP1-How-to-get-initialized-a-generic-GPIO-to-control-a-LED-with-a-pull-up-pull-down

Regards.

[Sisyphus38]

Hello Patrick,

Thank you for your answer.

This sounds like developping driver module on linux.

I hoped that some leds where already available for driving from the stlinux shell on this STM32MP157C-Dk2 plateforme.

Now, lets take this readings !

Regards.

[Paul1]

STM32 Education = https://www.st.com/content/st_com/en/support/learning/stm32-education.html Many Sections & Styles

ST Getting Started = https://wiki.st.com/stm32mcu/wiki/STM32StepByStep:STM32_step_by_step_overview

ST Development Zone = https://wiki.st.com/stm32mcu/wiki/Development_zone

I recommend the set of tutorials under education for the STM32 series you have selected (F4, L4, H7...), they seem to be a bit more complete than the others.

You will see many references to examples in this path, but I found those to mostly be pre-STM32CubeMX

• C:\Users\<user>\STM32Cube\Repository

Paul

[Sisyphus38]

Thank you Paul for this usefull informations. I dive into them.

Regards

[Sisyphus38]

Hello,

https://github.com/brgl/libgpiod/blob/master/README

A "new" libgpiod library is installed in the stlinux kernel. ( Apparently Sysfs is deprecated).

In my case of the STM32MP157C-Dk2 the lib woks well. example

-"gpiodetect" gives all available GPIOx ports

-"gpioinfo gpiochip7" gives all pins and the config states

-"gpioset gpiochip7 7=1" makes the LED7 Orange ON.

- "gpioget gpiochip0 14" gives the state of the user button USER1.

Regards

[Olivier GALLIEN]

Hi @Sisyphus38​ ,

I confirm your finding.

You may have find all information in wiki page https://wiki.st.com/stm32mpu/wiki/How_to_control_a_GPIO_in_userspace

And in an already provided exemple in /usr/local/Linux-A7-examples/GPIO/leds on your target.

Olivier