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]

Taron said:

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

What data are you missing, is it only the Carriage return(\r) and line feed (\n) as shown in your first post? Also, do you see the same with different terminal emulators (putty, Tera Term, Real term, etc)?

[Taron]

data is not important, every data is same. I used Application(Smart phone) -(ble)- nrf52832 -(uart)- stm32F4. 

[Vidar Berg]

I see. So, you would need to verify through debugging that the STM is sending data as expected and that the nRF is receiving all the data being sent. You can monitor the UART events by logging them in the UART callback (logging over RTT is enabled by default).

[Taron]

Yes i know it. So i did debugging STM and nRF(RTT) and Application. Application just send correct data. but sometimes nRF recieve wrong data. like 0x01 0x02 0x03 0x04 0x05 0x01 0x02 0x03 0x04 0x05 0x01 0x02 0x03 0x04 0x05 0x06 \r\n. I already check the signal with oscilloscope. oscilloscope data is correct.

[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.