I would like to knew why the GPIO-Pin PA11 is on high level while the Board boots. I configured the Pin Muxing with CubeMx and Loaded the Device tree for the Kernel in the boot directory and synced it. I configured the pin as a PWM pin.

[PGeuc.2036]

When I run my M4 Application every thing is working fine. But while the Board boots until i start the M4 remoteproc the pin is on high level. How can I set the pins reset(boot) configuration to low? I'am using the developer package.

[PatrickF]

High level sound like the default value of TIM1_CH4 until the TIM1 registers are configured. So you see this level as soon as Linux parse the Device Tree and configure the PA11 AFMUX to TIM1_CH4.

Then when your M4 application setup TIM1 registers, the TIM1_CH4 is set at the expected level.

Don't know if this could be avoided.

[PatrickF]

Hi,

this could probably be overcome using the method described here : https://wiki.st.com/stm32mpu/wiki/How_to_configure_system_resources

You should disable the related TIM1 setting in Linux and add your own code for GPIO PA11 AFMUX setting using HAL after the TIMx configuration.