RTT not appearing in modified ble_app_uart example

Question

Hello, 
 I have been developing software on the ble_app_uart example in Segger Embedded Studio with sdk 17.0.2. The example has RTT enabled but I noticed when I try to use RTT in my modified version that no RTT shows up in the debugging window. I added various libraries and changed the config file, but did not remove anything or turn off anything in the config file from the example. I wasn't sure how to troubleshoot this and was wondering what potential problems might be interfering with RTT outputs in the debugging terminal. Here is my main() code, I can add more if necessary. 
 
 int main(void)
{
 bool erase_bonds;
 ret_code_t rc;

 // Initialize.
 twi_init();
 uart_init();
 log_init();
 timers_init();
 buttons_leds_init(&erase_bonds);
 power_management_init();
 ble_stack_init();
 gap_params_init();
 gatt_init();
 services_init();
 advertising_init();
 conn_params_init();


 /* Register first to receive an event when initialization is complete. */
 (void) fds_register(fds_evt_handler);


 rc = fds_init();
 APP_ERROR_CHECK(rc);

 /* Wait for fds to initialize. */
 wait_for_fds_ready();

 // Start execution.
 printf("
UART started.
");



 //turn on LED3 while on and not in sleep mode
 nrf_gpio_cfg_output(LED2);
 nrf_gpio_pin_clear(LED2);

 NRF_LOG_INFO("Debug logging for UART over RTT started.");



 //button press waits for a button press event or times out and goes to sleep mode if no button press is received in 15 seconds
 
 
 buttonPress(); 

 nrf_delay_ms(100);

 advertising_start(); 

 //advertise for 15 seconds then try to send the data
 nrf_delay_ms(5000);

 //SendTime sends the entire memory, should add a condition to make sure that it's connected to BLE, potentially only send new entries etc.
 SendTime(); 

 //wait 5 seconds after sending the data before entering sleep mode, just here to give time to read in devtools for debugging
 nrf_delay_ms(5000);

 sleep_mode_enter_wakeup_enabled();
 
 


 // Enter main loop.
 for (;;)
 {
 idle_state_handle();
 }
}

Simonr · Accepted Answer

Hi Jake 
 It took a minute to get the device up and running due to the paths you mentioned, but it was easy enough to remedy on my end when I knew. However, I had some trouble building due to this function in your main.c: 
 
 switch(writeBool) 
 { 
 case 0 : 
 snprintf(intermediate, sizeof(intermediate), "S: %x:%x:%d %x/%x/%x", rx_data[2], rx_data[1], rx_data[0], rx_data[5], rx_data[4], rx_data[6]);
 break;

 case 1 : 
 snprintf(intermediate, sizeof(intermediate), "E: %x:%x:%d %x/%x/%x", rx_data[2], rx_data[1], rx_data[0], rx_data[5], rx_data[4], rx_data[6]);
 break;

 default :
 break;
 } 
 First off, I get a warning because the switch condition has a boolean value, and tit seems like the snprintf functions are interfering with the way SEGGER_RTT_Syscalls_SES.c does RTT. If I commented this function out and set the RETARGET_ENABLED define in sdk_config.h to 0 on my end, RTT seems to work fine in the RTT Viewer, as it prints the wake up process every few seconds: 
 
 I think you need to rework this function as it seems to be the culprit to why the RTT viewer doesn't work. Please note that I didn't get the example running while using this function, so what changes did you make to other files, like the SEGGER_RTT_Syscalls_SES.c to get it to run on your end? 
 Best regards, 
 Simon

RTT not appearing in modified ble_app_uart example

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