ble_app_uart example sending ble data is not work

[Taron]

i use ble_app_uart example code.

i have some problem that sometimes MCU can send data to application. but sometimes MCU can't..

ex) Success : 0x01 0x02 0x03 0x04 0x05 \r\n

                       0x01 0x02 0x03 0x04 0x05 \r\n

                       0x01 0x02 0x03 0x04 0x05 \r\n

     Fail :          0x01 0x02 0x03 0x04 0x05 0x01 0x02 0x03 0x04 0x05 0x01 0x02 0x03 0x04 0x05 0x06 \r\n

After I sent packet and have some delay, i send next packet. but sometimes sent data continuously.

Please answer to me.

Thanks

[Vidar Berg]

Hello,

I need more information to understand the problem and the issue you're facing. Are you using the original sample as-is to relay data received from the UART interface? 

Best regards,

Vidar

[Taron]

yes, exactly. I used original sample(ble_app_uart) and sometimes nrf52832 recieved relay data from the UART interface. not everytime.  

[Vidar Berg]

Are you logging the UART error events (APP_UART_COMMUNICATION_ERROR & APP_UART_FIFO_ERROR), and are any of these events raised when you are missing the data? Also, it is still not clear what data you are missing, is it only the  Carriage return(\r) and line feed (\n)?

[Taron]

Actually this problem is not missing data, The problem is that data receive in all at once.

No events occur, when nRF receive invalid data. it just works normally.

[Vidar Berg]

So the missing '\n' and '\r' character are as expected?

[Taron]

Actually no. there is no missing data. nRF receive all data. this problem is only that data receive in all at once.

[Vidar Berg]

Taron said:

ex) Success : 0x01 0x02 0x03 0x04 0x05 \r\n

                       0x01 0x02 0x03 0x04 0x05 \r\n

                       0x01 0x02 0x03 0x04 0x05 \r\n

     Fail :          0x01 0x02 0x03 0x04 0x05 0x01 0x02 0x03 0x04 0x05 0x01 0x02 0x03 0x04 0x05 0x06 \r\n

How should I interpret this then? I can't help troubleshoot without a clear description of the problem. Note  that the app uart library on the nRF only uses 1-byte DMA receive buffers so it cannot receive multiple bytes at a time.