GPIO Interrupts on STM32MP1

NPal.2 · ‎2021-07-20

Hi,

I am trying to interface a rotary encoder to A7 on STM32MP1.

I was able to get the CubeMx COnfiguration done and got the device tree file generated.

Also looked into this document:

https://wiki.st.com/stm32mpu/wiki/Interrupt_overview#pinctrl_irqchip

However i could not understand simply how do i detect interrupt has happened and take decision over it?

How are interrupt handler for this needs to be written?

PatrickF · ‎2021-07-20

Did you check the SDK environment (needed to run a script each time a new console is open), see https://wiki.st.com/stm32mpu/wiki/Install_the_SDK#Start_the_SDK_up ?

Regards.

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PatrickF · ‎2021-07-20

Hi,

did you have a look to https://wiki.st.com/stm32mpu/wiki/IIO_overview#How_to_use_the_framework

and https://wiki.st.com/stm32mpu/wiki/How_to_use_the_IIO_user_space_interface#How_to_use_the_quadrature_encoder_with_the_sysfs_interface

Regards.

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NPal.2 · ‎2021-07-20

Hi @PatrickF . Thanks for your reply.

I am trying this procedure. But in due course while trying to compile the dts file while following this procedure i get error:

npal@npal-noccarc:~/STMDTB/kernel/kernel-sources$ make stm32mp157c-rotaryencoder-mx.dtb LOADADDR=0xC2000040 O="$PWD/../build"
make[1]: Entering directory '/home/npal/STMDTB/kernel/build'
make[1]: *** No rule to make target 'stm32mp157c-rotaryencoder-mx.dtb'.  Stop.
make[1]: Leaving directory '/home/npal/STMDTB/kernel/build'
make: *** [Makefile:185: __sub-make] Error 2

I tried adding this manually to Makefile too. But not luck. Any suggestions?

PatrickF · ‎2021-07-20

Did you check the SDK environment (needed to run a script each time a new console is open), see https://wiki.st.com/stm32mpu/wiki/Install_the_SDK#Start_the_SDK_up ?

Regards.

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NPal.2 · ‎2021-07-21

hI @PatrickF : Thanks for pointing that out. Looks like it exits cleanly but not dtbs is generated. Am i missing something here ? I cannot see any dtb files generated in arch/arm/dts folder. post using alternate command make dtbs as well.