uart0 setting in device tree

RE: uart0 setting in device tree

Einarh — Tue, 19 Apr 2022 09:04:42 GMT

What do the uart nodes in your zephyr.dts look like now?

Have you tried enabling uart1 and using that instead of swapping around on the pin settings to use the same pins?

Best regards,

Einar

RE: uart0 setting in device tree

Vassilis — Fri, 08 Apr 2022 10:20:29 GMT

I have included the following overlay to root the uart0 signals to where uart1 signals normally are.

&uart0 {
tx-pin = < 0x1 >;
rx-pin = < 0x0 >;
rts-pin = < 0xe >;
cts-pin = < 0xf >;
};

&uart1 {
tx-pin = < 0x1d >;
rx-pin = < 0x1c >;
rts-pin = < 0x1b >;
cts-pin = < 0x1a >;
};

I indeed stopped receiving from VCOM0 as expected, (VCOM1 now only outputs the bootloader messages) but I am not receiving anything from VCOM2 that uart1 is normally connected as I would expect.. Any ideas?

RE: uart0 setting in device tree

Einarh — Mon, 04 Apr 2022 15:04:08 GMT

You can also create the overlay file yourself in the Segger environment, but yes I would recommend giving VS Code a try.

RE: uart0 setting in device tree

Vassilis — Mon, 04 Apr 2022 14:58:14 GMT

Thanks, I am using the Segger environment that's why I was not familiar with the tool.

It looks like I should give VS Code a try

RE: uart0 setting in device tree

Einarh — Mon, 04 Apr 2022 14:52:41 GMT

Yes, this will create a devicetree overlay file for you containing the new values you set.

RE: uart0 setting in device tree

Sevn — Mon, 04 Apr 2022 14:50:02 GMT

If you're in vscode, you should go to the nordic environment, there you will see, above actions, the device tree. open the "busses" folder, then open the uart folder of the uart you desire to use. You can see a few settings there. If you click the pensil, you will be able to edit your desired setting.

RE: uart0 setting in device tree

Einarh — Mon, 04 Apr 2022 14:38:48 GMT

Hello!

zephyr.dts is generated when you build your project, which is why changing it has no effect.

You can see how this file is generated and learn more about the Zephyr devicetree here.

In order to overwrite these values you can include a devicetree overlay file in your project.

Best regards,

Einar

RE: uart0 setting in device tree

Vassilis — Mon, 04 Apr 2022 14:29:30 GMT

Thanks for the quick answer,

by the "by clicking the pen icon next to the pinnumbers", it looks like you are referring to an editing tool which one is it?

RE: uart0 setting in device tree

Sevn — Mon, 04 Apr 2022 14:20:28 GMT

Hello,

I walked into this problem once.

You can change the pins with an overlay by clicking the pen icon next to the pinnumbers in the devicetree. You also need uart1 instead of uart0 if I remember correctly.