nRF Uart v2.0 not Receiving

[Nick]

I am using the eval board, sdk v5.2.0, s110 v5.0 and a galaxy nexus with the UART Nordic app. I have not been able to receive any data on the android end. After

void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)

is called i turn toggle an led. I can verifty that when i type something in my android device that it receives the message because the led will toggle. However i never get any messages back.

Much Thanks,

Nick

[Vidar Berg]

Hi, are you using a terminal on your computer to pick up the data received by your board? There is no automatic echoing implemented in ble_app_uart, so it does in other words not respond to received strings via ble. There is a startup message on the board, but it is only sent over the UART when the application starts.

Assuming that you didn't use a terminal. What you need to do is opening the corresponding com port in a terminal with 38400 baud rate and 1 stop bit.

Best regards,

Vidar

Edit: Code snippet to echo rx data to tx

void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
  {  
      uint32_t err_code;
      /*Echo incoming data*/
      err_code = ble_nus_send_string(&m_nus, p_data, length);

      //err_code = ble_nus_send_string(&m_nus, p_data, length);
      
      if (err_code != NRF_ERROR_INVALID_STATE)
         {
              APP_ERROR_CHECK(err_code);
         }
   }

[Vidar Berg]

There are unfortunately no examples that do all this, but it should however be quite easy to add this functionality in the existing example. I have edited my answer with a code snippet that enables echoing of received strings. You could change the echoing to send your debug information instead. Although, if you only want to test the functioning of your sensors it sounds like it would be faster to just use a J-link debugger instead?