Add a test case that ensures that uart_rx_enable() can be successfully
called after RX is disabled with uart_rx_disable() and also when it is
disabled automatically after the provided RX buffer is filled up.
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
Check for proper driver behaviour if timeout for uart_rx_enable or
uart_tx is set to K_FOREVER.
Signed-off-by: Mieszko Mierunski <mieszko.mierunski@nordicsemi.no>
Added tests for async UART API and test configuration for
nrf52840_pca10056 board.
For tests to work, RX and TX pins have to be connected together
and second UART is needed to output results to console.
Signed-off-by: Mieszko Mierunski <mieszko.mierunski@nordicsemi.no>
