UART on nRF52833 DK

[Siddharth Venkatesh]

Hi 

How do you transmit using UART on segger. Up until now I have been using the debug console and the NRF_LOG_INFO command to send information from the DK to my computer.

I found out that if somehow I had used NRF_LOG_INFO command to print strings it would also communicate through the COM port.

However, I want to use a better method to achieve this. Could I use printf and still transmit the code. I tried using the code from the UART program in examples/peripherals/uart in the SDK. Unfortunately I could not get it to work. 

Could you just show me the code I could use. 

Thanks a lot 

[Jørgen Holmefjord]

Hi,

In order to use printf to transmit data over UART, you need to include the Retarget layer for stdio functions.

Add the source file components\libraries\uart\retarget.c to your project, and enable retargeting in your sdk_config.h file:

// <q> RETARGET_ENABLED  - retarget - Retargeting stdio functions

#ifndef RETARGET_ENABLED
#define RETARGET_ENABLED 1
#endif

Best regards,
Jørgen

[Siddharth Venkatesh]

Hi 

Does this work for transferring data through the com ports. I tried it and it stopped outputting on the debug console but, it did not show up on the COM7 I was monitoring on my pc. 

Thanks

[Jørgen Holmefjord]

You need to initialize the UART library as well, similar to the UART peripheral example. The retarget functionality use app_uart_put/get functions for stdio retargeting.