Added low power configuration to testcase.yaml. In this mode
UARTE is disabled when RX and TX is not used.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
Added gpio_loopback to indicate that test requires pins to be
shorten. This allows to filter out tests on setup which does
not have pin setup.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
Added test which is calling uart_poll_out from various contexts and
asynchronous/interrupt driven API. Test is validating that calls
can be preempted at any moment and no data is lost.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>