question about STM32MP157C-DK2

[zqizh.1]

Hi,

My test kit is STM32MP157C-DK2 and kenerl version is 5.10.10.

I tried to monitor falling edge event on PD.1, with command "gpiomon --falling-edge gpiochip3 1".

It is faile and and the log in the attachment.

Then I disable "hdmi-transmitter@39" in "stm32mp15xx-dkx.dtsi" and comiple it again and replace file in the OS, Then executing command "gpiomon --falling-edge gpiochip3 1" will work correctly.

Please advise why PIN PG.1 interrupt configuration will affect PIN PD.1 interrupt configuration.

Thanks,

QiZhang

[PatrickF · Accepted solution]

Hi,

this is due to EXTI constrain on muxing from pins,

See https://wiki.st.com/stm32mpu/wiki/EXTI_internal_peripheral

"Up to 16 GPIO pins can be configured as external interrupts: for each index between 0 and 15, one EXTI can be selected among all banks (EXTI<index> = GPIO<one_bank><index>)."

or Reference Manual

Regards.

[PatrickF]

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