Change pinmux at runtime?

[Morten Sabinsky]

Hi

I am developing a Zephyr application on a nRF52840.

Is it possible to runtime change pinmux. Eg. I have set rx/tx for an uart to p1.8, p1.9 and want them to be changed to p1.10, p1.11 at a later stage? (Is new to Zephyr and nRF)

I have been digging though the Zephyr code base and suspect that it is nor possible?

/Morten

[Håkon Alseth]

Hi Morten,

 

Unfortunately, its not possible to change this run-time using the zephyr serial driver, but you can do this manually by writing to the NRF_UARTEx registers. This is how you shut down the peripheral:

https://devzone.nordicsemi.com/f/nordic-q-a/68599/zephyr-nrf52840-device-crashes-when-turning-off-uart-with-device_set_power_state-uart-device_pm_off_state-null-null/281533#281533

 

Enabling it (do note that .ENABLE is 8 for UART mode! https://infocenter.nordicsemi.com/topic/ps_nrf9160/uarte.html?cp=2_0_0_5_18_8_39#register.ENABLE) is basically starting the tasks that you stopped.

 

Kind regards,

Håkon

 

[Morten Sabinsky]

Hi Håkon

Thanks it seems to work. 

/Morten