Problem with retarget.c

Question

Hi 
 I'm using PCA10028. it has nrf51422 with softdevice s110. For getting printf in console I'm using 'app_uart.c with FIFO' and 'retarget.c'. When i try to print something I'm getting only the first character in console. 
 printf("starting");
printf("TWI initialized 
");
 
 If I'm printing the above I will get output as 
 
 sT 
 
 I tried to edit the function fputc(int ch, FILE * p_file) in retarget.c as below, 
 UNUSED_PARAMETER(p_file);

// UNUSED_VARIABLE(app_uart_put((uint8_t)ch));
	
while(app_uart_put((uint8_t)ch) != NRF_SUCCESS);
 
return ch;
 
 Then I'm getting the output on the console correctily.
But I'm using an app_timer in the program. When this timer expires one handler will be called. Inside this handler I'm using printf. When it starts printing it gets stuck at 
 while(app_uart_put((uint8_t)ch) != NRF_SUCCESS);
 
 This app_uart_put((uint8_t)ch) never returns NRF_SUCCESS and keeps on iterating. 
 Please help me...

MartinBL · Accepted Answer

The function declarations in app_uart.h are valid for the functions defined in app_uart_fifo.c so you are simply supposed to use app_uart.h combined with app_uart_fifo.c instead of app_uart.c. There is no app_uart_fifo. h required.