With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

ayavilevich — Mon, 09 Aug 2021 18:09:20 GMT

Hey,

Thanks, this is what I was looking for.

By adding

&uart0 {
	compatible = "nordic,nrf-uart";
};

(note, must not have space)

to a "nrf52840dk_nrf52840.overlay" file in the project I was able to change the driver for uart0.

Unfortunately this didn't have an effect of changing power consumption like I expected based on other discussions. I will check further.

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

Heidi — Fri, 06 Aug 2021 13:57:45 GMT

Oh, I see.

Looks like this is set by checking the DeviceTree. So you will need to an overlay file and change the uart0 node so that the compatible property is "nordic,nrf-uart", instead of "nordic,nrf-uarte".

So add a file <board_name.overlay> with the contents:

&uart0 {
	compatible = "nordic, nrf-uart";
};

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

ayavilevich — Wed, 04 Aug 2021 07:24:47 GMT

Hi, if I add CONFIG_SERIAL=n to the prj.conf file then it will disable serial/uart for the project. This is not what I am asking about.

What I am trying to do is not to disable serial but make a configuration such that CONFIG_UART_0_NRF_UARTE=n and CONFIG_UART_0_NRF_UART=y (which are not user-configurable entries).

And so that I am using the code in https://github.com/nrfconnect/sdk-zephyr/blob/master/drivers/serial/uart_nrfx_uart.c rather than in https://github.com/nrfconnect/sdk-zephyr/blob/master/drivers/serial/uart_nrfx_uarte.c .

The reason why I am looking to do that is because of power consumption. More information here: https://devzone.nordicsemi.com/f/nordic-q-a/47578/nrf52832-uart-power-consumption .

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

Heidi — Tue, 03 Aug 2021 11:20:16 GMT

Hi! Håkon is on vacation so I will be taking over this case.

UART with easyDMA is dependent on CONFIG_SERIAL which is enabled in the board folder of the nRF52 devices.

So to configure UART without, just disable this config by adding CONFIG_SERIAL=n to the prj.conf file of your application.

Best regards,

Heidi

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

ayavilevich — Tue, 27 Jul 2021 15:30:59 GMT

This is for nRF52 series. What are the changes that one can make to to configure UART without easyDMA when using NCS on the nRF52?

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

Hakon — Tue, 27 Jul 2021 12:11:27 GMT

What board do you build for. UART without easyDMA is not available on the nRF9160 or nRF5340. It is however available on the nRF52 chips.

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

ayavilevich — Wed, 21 Jul 2021 13:04:49 GMT

Replace where? The reference says "(No prompt – not directly user assignable.)" about these config options.

RE: With nRF Connect SDK, how to I change uart0 to "nRF UART without EasyDMA"?

Hakon — Wed, 21 Jul 2021 11:39:29 GMT

Hello,

you can try replacing CONFIG_UART_0_NRF_UARTE with CONFIG_UART_0_NRF_UART.