Garbage byte receiving in ble_app_interactive example.

[tni]

I am testing UART between PCA10040(nrf52832) and Raspberry Pi 4. I connect TX/RX/GND 3 lines between RPI4 and PCA10040.

On host RPI4 side, my test app send 1 byte to 32 byte text data on every 100ms. The text dada ends with 0x0a.

On client side, I use RF5_SDK_17.1/examples/ble_central_and_peripheral/experimental/ble_app_interactive example.

I add received byte verifying code in cli_uart_read(), nrt_cli_uart.c

Byte send test is success on 1 byte to 25 byte.

When receiving 26 bytes text, the example's uart_event_handler() is called with NRF_DRV_UART_EVT_ERROR.

After that, receiving byte become garbage.

Same test with nRF5_SDK_17.1/examples/peripheral/uart was success, 1 bytes to 128 bytes.

If you know a way to fix this garbage data, please let me know.

Thanks,

[Jared]

Hi,

1. The specific reason for your error is specified in the error register. Add this line in the event handler to see what error is causing this. 
2. You could also try to increase the RX buffer by adjusting the 4th parameter of NRF_CLI_UART_DEF()

regards

Jared 

[toruish]

I modified main.c with _rx_buf_size=32 on NRF_CLI_UART_DEF().

I add 100ms sleep on each 32 byte sending on host side code.

Then all data are correctly sent and received.

Thanks

[Jared]

Perfect, 

Good that you were able to solve it. 

regards

Jared