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drivers: nrf: Flush RX fifo in UARTE Async API.

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After RX is disabled during receiving, some bytes are received to
internal fifo. To not interfere with further transactions fifo has to be
flushed.

Signed-off-by: Mieszko Mierunski <mieszko.mierunski@nordicsemi.no>
This commit is contained in:
Mieszko Mierunski 2020-02-21 12:31:51 +01:00 • committed by Ioannis Glaropoulos
commit 0278f9bc72
1 changed files with 17 additions and 2 deletions
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19
drivers/serial/uart_nrfx_uarte.c
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@ -712,6 +712,15 @@ static void endrx_isr(struct device *dev)
NRF_UARTE_Type *uarte = get_uarte_instance(dev);
if (!data->async->rx_enabled) {
if (data->async->rx_buf == NULL) {
/* This condition can occur only after triggering
* FLUSHRX task.
*/
struct uart_event evt = {
.type = UART_RX_DISABLED,
};
user_callback(dev, &evt);
}
return;
}
@ -783,9 +792,15 @@ static void rxto_isr(struct device *dev)
user_callback(dev, &evt);
data->async->rx_next_buf = NULL;
}
evt.type = UART_RX_DISABLED;
user_callback(dev, &evt);
/* Flushing RX fifo requires buffer bigger than 4 bytes to empty fifo */
static u8_t flush_buf[5];
nrf_uarte_rx_buffer_set(get_uarte_instance(dev), flush_buf, 5);
/* Final part of handling RXTO event is in ENDRX interrupt handler.
* ENDRX is generated as a result of FLUSHRX task.
*/
nrf_uarte_task_trigger(get_uarte_instance(dev), NRF_UARTE_TASK_FLUSHRX);
}
static void txstopped_isr(struct device *dev)