topic Re: imx93 | setting LPUART baudrate in i.MX Processors

imx93 | setting LPUART baudrate

sbmd_1234 — Thu, 05 Dec 2024 09:19:11 GMT

Hi,

I have configured the LPUART2 configuration in the dts file and I am also getting the ttyLP1 file created successfully, but I want to change its baud rate.

It is currently set to BR 9600 but I want to change it to 115200 how can I do this?

LOGS:
root@imx93-11x11-lpddr4x-evk:~# stty -F /dev/ttyLP1
speed 9600 baud; line = 0;
-brkint -imaxbel

Thanks.

Re: imx93 | setting LPUART baudrate

Chavira — Thu, 05 Dec 2024 15:02:25 GMT

Hi @sbmd_1234!
Thank you for contacting NXP Support!

You can use the next command to set the baudrate to 115200:

stty -F /dev/ttyLP1 115200

Best Regards!

Chavira

Re: imx93 | setting LPUART baudrate

sbmd_1234 — Thu, 05 Dec 2024 15:55:45 GMT

Hi @Chavira,

I don't want to do it manually using any user space command I want to configure it as by default baud rate. After boot, the baud rate should be 115200.

Thanks.

Re: imx93 | setting LPUART baudrate

Chavira — Thu, 05 Dec 2024 16:11:38 GMT

Hi @sbmd_1234!

Try adding the property current-speed = <115200>; to your device tree.

If that doesn't work please let me know.

Best Regards!

Chavira

Re: imx93 | setting LPUART baudrate

sbmd_1234 — Thu, 05 Dec 2024 16:19:49 GMT

Hi,

Already tried adding this in dts but that didn't work. Please tell me any alternate solution for this.

Thanks.

Re: imx93 | setting LPUART baudrate

Chavira — Thu, 05 Dec 2024 16:42:58 GMT

Hi @sbmd_1234!

I will be go deeper into it, the configuration can be done in device tree.

The fastest solution for this problem can be solved creating a service.

Create the service:

nano /etc/systemd/system/LPUART_CONFIG.service

Save the next content in the file:

[Unit] Description="LPUART CONFIG" [Service] ExecStart=stty -F /dev/ttyLP1 115200 [Install] WantedBy=multi-user.target

Enable the script in the startup/boot sequence following the
command:

systemctl enable LPUART_CONFIG.service

and reboot.

After that every time the LPUART should be configured in the correct baudrate.

Best Regards!

Chavira

Re: imx93 | setting LPUART baudrate

Chavira — Thu, 05 Dec 2024 17:10:23 GMT

Hi @sbmd_1234!

Follow the instructions that I provide.

I implemented the service and it works by my side.

Re: imx93 | setting LPUART baudrate

sbmd_1234 — Thu, 05 Dec 2024 17:34:08 GMT

Thanks for your support!

I will check by my side also and let you know.

meanwhile please let me know if this could be done through the device tree file also.

Re: imx93 | setting LPUART baudrate

sbmd_1234 — Mon, 09 Dec 2024 06:29:09 GMT

Hi

Thanks the service worked for me.

If It is also possible to change the baudrate from device tree then please let me know.

Thanks for your support!!