Baud Rate change within program

[Tharak]

Hi Nordic,

1.I am running  (C:\ncs\v2.1.0-rc2\zephyr\samples\drivers\uart\echo_bot) but i need to change baud rate within program

2. I Can Change my baud rate using overlay file

3. But I dont want overlay file i need to make changes within program

[Jørgen Holmefjord]

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

[Jørgen Holmefjord]

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".

[Tharak]

Hi Jorgen,

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

[Jørgen Holmefjord]

Hi,

Here is the modified sample I used for testing: echo_bot_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