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NRF52 clear UART FIFO

Hi,

I am using nrf52-DK (First Version in the moment) and need to test UART interface. I use the example from the blue-nus example from the SDK which is working fine. I have only some problems by correct usage of FIFO buffer which is overflowing all the time (if I am calling app_uart_put (...) more the 256 times). How can i clear this buffer?

Thank you and best regards, Nils