APP_UART_FIFO_ERROR

[Sawada]

The size of the FIFO is sufficient.
The value is extracted from the FIFO after being received by the UART.
Repeat UART reception.

APP_UART_FIFO_ERROR occurs in the above process.

Is there a case where APP_UART_FIFO_ERROR occurs when the "RX" FIFO is not over capacity?

[Susheel Nuguru]

Is there a case where APP_UART_FIFO_ERROR occurs when the "RX" FIFO is not over capacity?

Not sure how you are verifying that the FIFO is not over capacity, but it would be nice to see the code context of where this error is happening. Or you could increase the size of the FIFO and see if that could solve your application problem. In SDK15.3\examples\ble_peripheral\ble_app_uart example you can see that the APP_FIFO is initialized with the given buffer sizes. Try to increase it in your application.

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);