Changing UART TX and RX pins during Zephyr runtime with nrfx

[morerook]

Hello,

I have three devices that use UART, connected to an nRF52832 that I'm using NCS 1.6.0 to program. Since the nRF52832 only has one UART module and Zephyr has no native capability to change the pins, I was hoping to get some guidance in how can I combine nrfx to modify the tx and rx pins while using Zephyr to control the UART.

void change_pins(uint8_t tx, uint8_t rx) {
    NRF_UARTE0->PSEL.TXD = tx;
    NRF_UARTE0->PSEL.RXD = rx;
}

Would this be sufficient to switch the pins or is other configuration required?

[Sigurd]

Hi,

morerook said:

Would this be sufficient to switch the pins or is other configuration required?

You would e.g. need to disable the UART, configure the pins, and then enable the UART again for it to work.

See e.g. this post: https://devzone.nordicsemi.com/f/nordic-q-a/77308/change-pinmux-at-runtime

morerook said:

Zephyr has no native capability to change the pins

Correct. You would need to use the nrfx API directly for this. This sample here might be useful: https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/boards/nrf/nrfx_prs

[zaman_turja_solshare]

Hi morerook , i was working on same thing, i got the disable thing but how did you changed the pin and reenabled it ?