NRF_LOG_INFO and printf does not work

Question

Hello, 
 I am trying to print things from my board. I would like to go with NRF_LOG_INFO. I have the modules enabled, included the essential libraries, including the c files, but it does not work. 
 
 uint32_t err_code = NRF_LOG_INIT(NULL);
 APP_ERROR_CHECK(err_code);

 NRF_LOG_DEFAULT_BACKENDS_INIT();
	NRF_LOG_INFO("Hi!");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();
	
 //gpio_init();
	pin_init();
	NRF_LOG_INFO("Pin Init OK?");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();
	
	comp_init();
	NRF_LOG_INFO("COMP Init OK?");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS();
	
	NRF_LOG_INFO("Ready...");
	NRF_LOG_FLUSH();
	NRF_LOG_PROCESS(); 
 I am using NRF52DK with SDK v14.20. I use PuTTY and have connected to the correct virtual COM port with the correct configuration. 
 Is there anything I may be missing? 
 Thank you in advance.

Winz · Accepted Answer

Okay, i fixed it. 
 Reading this thread, it shows that there's a bug in SDK 11, which still present on SDK 14. 
 TL;DR: 
 1. Don't use app_uart . Use app_fifo and app_uart_fifo instead. 
 2. add "#include "app_fifo.h" " 
 3. add this in sdk_config.h: 
 // <q> APP_FIFO_ENABLED - app_fifo - Software FIFO implementation
 

#ifndef APP_FIFO_ENABLED
#define APP_FIFO_ENABLED 1
#endif 
 
 I hope this thread will be #1 on Google so other developers won't face this problem like I did. 
 I'm removing my project file and converting this thread to public

NRF_LOG_INFO and printf does not work

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