Problem on using the nrf_uart no NRF_DRV_UART_EVT_RX_DONE event

[mcau1]

I am trying to use the UART for a custom version of the DFU. I have it transmitting no problem, but I never get the RX_DONE event. I cannot see any reason and I have looked through the queries with the same issues. I am using SDK 15 and S132.

Thank you.

[Vidar Berg]

Hello,

Please try to inspect the UARTE registers if you have not already to see if it looks as expected. E.g., if the received amount (RXD.AMOUNT) is zero, correct pin numbers, etc.

Peripheral register view from Segger Embedded Studio:

[mcau1]

I solved this issue. The problem was I expected the RX event due to characters recieved in the serial port (this is standard on almost every driver or implementation of any Uart on embedded systems. However with this driver not only does a buffer need to be assigned but it also requires a count of characters.

I added the line.

nrf_drv_uart_rx(&my_uart, &m_rx_byte, 1);

The other issue was I found other people with a similar problem who identified issues with the library.

In the end my fault. 

Thank you.

[Vidar Berg]

Thanks for reporting back. Glad to hear that you were able to resolve it.  As you noted, the application is responsible for providing the DMA buffer(s) when you use the UARTE (driver doc)