uart0 TX RX pin

RE: uart0 TX RX pin

Øivind — Tue, 23 Nov 2021 11:18:50 GMT

That should be possible, but you will have to also modify nrf5340_cpunet_reset.c. Commenting out this code may be enough:

In addition to disabling the uart0 node on the network core.

RE: uart0 TX RX pin

Jason — Mon, 22 Nov 2021 02:38:35 GMT

Hi Øivind,

Thanks for your quick response.

One more question. Is it possible to disable the UART on the network core, so that we can use these pins for other peripherals?

RE: uart0 TX RX pin

Øivind — Fri, 19 Nov 2021 13:52:59 GMT

Hi,

I would recommend that you use other pins if that is possible.

Pin 32 and 33 correspond to P1.00 and P1.01. These are used for the UART on the network core, and this can not be changed from the application folder.

If you are certain that you modify these pins, you will have to modify two files in in the board files folder: zephyr/boards/arm/nrf5340dk_nrf5340/
The first file is nrf5340_cpunet_reset.c.
Here you need to modify the two lines marked in red below to use different pins. They are set as 0 and 1, and the port (marked in blue) is set to 1, this translates to P1.00 and P1.01.

The second file is nrf5340dk_nrf5340_cpunet.dts.
Here you need to modify the uart0 node to use the same pins you selected in nrf5340_cpunet_reset.c.