Baud Rate change within program

RE: Baud Rate change within program

Jørgen Holmefjord — Wed, 21 Sep 2022 08:31:10 GMT

Hi,

Here is the modified sample I used for testing: devzone.nordicsemi.com/.../echo_5F00_bot_5F00_19200.zip

I moved the changing of baud rate earlier in the application, so now all UART TX/RX will use 19200 baud rate.

Best regards,
Jørgen

RE: Baud Rate change within program

Tharak — Mon, 19 Sep 2022 12:48:48 GMT

Hi Jorgen,

Please share your zip file then i can know where it is wrong

RE: Baud Rate change within program

Tharak — Fri, 16 Sep 2022 09:29:30 GMT

Hi Jorgen,

1. Still i tried 100 of time its only taking default 115200 only

2. I changed 9600 38400 57600 but its taking default

3. i am wondering its working for you its not working for me

4. i am using bl653_dvk board ncs v2.0.0 and west command and for flashing using tera term

5. I attaching build/zephyr/zephyr.dts screenshot

RE: Baud Rate change within program

Jørgen Holmefjord — Fri, 16 Sep 2022 08:59:11 GMT

[quote user="Tharak"]4. When i use your code and changed baud rate from 1000000 to 19200 its wont work [/quote]

What is not working? I tested it on my end and it works fine here.

[quote user="Tharak"]5. i think my problem you understood and i checked in build/zephyr/zephyr.dts file its showing 115200 baud rate [/quote]

This is expected, as the config from the devicetree will be used for initializing the UART. The updated baud rate will first take effect after you have run the code I provided.

RE: Baud Rate change within program

Tharak — Fri, 16 Sep 2022 06:59:37 GMT

Hi Jorgen,

1. I tried the code after print_uart statement

2. I didnt got anny errors thats fine

3. But my ulitimate goal is i need to print the statement in 19200 baud rate

4. When i use your code and changed baud rate from 1000000 to 19200 its wont work

5. i think my problem you understood and i checked in build/zephyr/zephyr.dts file its showing 115200 baud rate

RE: Baud Rate change within program

Jørgen Holmefjord — Thu, 15 Sep 2022 07:51:28 GMT

[quote user="Tharak"]1. When i paste this code in echo bot as you say at starting point [/quote]

I did not say that I pasted the code at the starting point of the sample, I said I used the sample as a starting point for adding this code.

[quote user="Tharak"]2. I got so many errors please check from your side and rectify the errors [/quote]

I did run the code at my end, and it is working properly (I used nRF Connect SDK v2.0.0). Put the code after this line.

If you get any errors, you need to post the errors here if you want me to help you resolve them.

RE: Baud Rate change within program

Tharak — Thu, 15 Sep 2022 05:40:43 GMT

Hi Jorgen,

Thank you for this code

1. When i paste this code in echo bot as you say at starting point

2. I got so many errors please check from your side and rectify the errors

RE: Baud Rate change within program

Jørgen Holmefjord — Wed, 14 Sep 2022 13:33:44 GMT

Using the echo_bot sample as a starting point, you can do something like this:

struct uart_config uart_config_current;

if(uart_config_get(uart_dev, &uart_config_current) != 0)
{
	printk("uart_config_get() returned error");
}

uart_config_current.baudrate = 1000000;

if(uart_configure(uart_dev, &uart_config_current) != 0)
{
	printk("uart_configure() returned error");
}
else
{
	printk("UART baudrate changed successfully");
}

If you then run a serial terminal at 1M baudrate, it should output some "garbage" (from the initial output at 115200 baudrate) and then print "UART baudrate changed successfully".

RE: Baud Rate change within program

Tharak — Wed, 14 Sep 2022 12:58:17 GMT

Hi Jorgen,

1.Sorry for telling i am little bit confused about api uart_configure and all

2. My Suggestion is could you provide a example with example code if possible

RE: Baud Rate change within program

Jørgen Holmefjord — Wed, 14 Sep 2022 12:51:47 GMT

Hi,

You can try the API uart_configure() to change the baudrate. You can get the current config using uart_config_get(), store this in a uart_config struct, change the baud rate in this struct, and set the config again.

Best regards,
Jørgen