Ble_app_uart stuck during the high speed uart transmission

[Small_Bubble]

Hi All

Now I am testing the example code \examples\ble_peripheral\ble_app_uart with Nordic nRF Connect app on smart phone. i do a limit change in function uart_event_handle, it shows  as below 

case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;
            if(index > 1)
            {
              NRF_LOG_DEBUG("Ready to send data over BLE NUS");
              NRF_LOG_HEXDUMP_DEBUG(data_array, index);
               index=2;
                do
                  {
                      uint16_t length = (uint16_t)index;
                      transdata[0]=0x31;
                      transdata[1]=0x32;
                      err_code = ble_nus_data_send(&m_nus, transdata,  &length, m_conn_handle);
                      
                     // err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
                      if ((err_code != NRF_ERROR_INVALID_STATE) &&
                          (err_code != NRF_ERROR_RESOURCES) &&
                          (err_code != NRF_ERROR_NOT_FOUND))
                      {
                          APP_ERROR_CHECK(err_code);
                      }

                  } while (err_code == NRF_ERROR_RESOURCES);
              index = 0;
            }        
            break;

 

the code will upload 0x31 & 0x32 when it receive any message from uart.

i do the test like below:

i keep to send message to the evaluation board by UART.

in the very beginning, i set the time interval as 100ms and there is no any issue.  the  nRF Connect app can receive the message.

but after i change time interval to 10ms, the nRF Connect app only can receive two or three message from evaluation board then it will disconnect.

after i debugging the code it will show as below:

 

My question is  why the example is stuck when i change the UART sending time interval into 10ms

[ox00]

Hi,

Are you using application_timer or nrf_delay ? Because i have problem using application_timer it will stuck and data transmisson is not complete. If I am using nrf_delay there is no problem. I sent about 244bytes  50ms x 20 times.  The receiving data is not in order. Or you can check the source code of mine doing.

https://github.com/zawawimanja/UART_RX_TX_nRF52840

[Vidar Berg]

Hi,

Please select the "Debug" target from the drop-down menu before you start debugging, see screendump below. That should result in a more detailed crash log. The screenshot you posted shows that it's coming from the uart callback, but not what the error code is.