static void rx_byte(NRF_UART_Type * p_uart, uart_control_block_t * p_cb)
{
if (!p_cb->rx_buffer_length)
{
nrf_uart_event_clear(p_uart, NRF_UART_EVENT_RXDRDY);
// Byte received when buffer is not set - data lost.
(void) nrf_uart_rxd_get(p_uart);
return;
}
nrf_uart_event_clear(p_uart, NRF_UART_EVENT_RXDRDY);
p_cb->p_rx_buffer[p_cb->rx_counter] = nrf_uart_rxd_get(p_uart);
p_cb->rx_counter++;
}
static int uart_nrfx_poll_in(struct device *dev, unsigned char *c)
{
if (!nrf_uart_event_check(NRF_UART0, NRF_UART_EVENT_RXDRDY)) {
return -1;
}
/* Clear the interrupt */
nrf_uart_event_clear(NRF_UART0, NRF_UART_EVENT_RXDRDY);
/* got a character */
*c = nrf_uart_rxd_get(NRF_UART0);
return 0;
}
/** Interrupt driven FIFO read function */
static int uart_nrfx_fifo_read(struct device *dev,
u8_t *rx_data,
const int size)
{
u8_t num_rx = 0;
while ((size - num_rx > 0) &&
nrf_uart_event_check(NRF_UART0, NRF_UART_EVENT_RXDRDY)) {
/* Clear the interrupt */
nrf_uart_event_clear(NRF_UART0, NRF_UART_EVENT_RXDRDY);
/* Receive a character */
rx_data[num_rx++] = (u8_t)nrf_uart_rxd_get(NRF_UART0);
}
return num_rx;
}
/**
* Interrupt handler of UART0 peripherial.
*/
void UARTE0_UART0_IRQHandler(void)
{
// Check if any error has been detected.
if (nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_ERROR))
{
// Clear error event and ignore erronous byte in RXD register.
nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_ERROR);
nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_RXDRDY);
}
else if (nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_RXDRDY))
{
// Clear RXDRDY event.
nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_RXDRDY);
// Read byte from the UART buffer.
uint8_t byte = nrf_uart_rxd_get(UART_INSTANCE);
if (!isRxBufferFull())
{
sReceiveBuffer[sReceiveHead] = byte;
sReceiveHead = (sReceiveHead + 1) % UART_RX_BUFFER_SIZE;
otSysEventSignalPending();
}
}
if (nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_TXDRDY))
{
// Clear TXDRDY event.
nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_TXDRDY);
// Send any more bytes if available or call application about TX done.
if (sTransmitLength)
{
nrf_uart_txd_set(UART_INSTANCE, *sTransmitBuffer++);
sTransmitLength--;
}
else
{
sTransmitDone = true;
nrf_uart_task_trigger(UART_INSTANCE, NRF_UART_TASK_STOPTX);
otSysEventSignalPending();
}
}
}
static int _uart_getc(struct rt_serial_device *serial)
{
int ch = -1;
UART_CFG_T *instance = working_cfg;
RT_ASSERT(serial != RT_NULL);
if (serial->parent.user_data != RT_NULL)
{
instance = (UART_CFG_T*)serial->parent.user_data;
}
if (nrf_uart_event_check(instance->uart.reg.p_uart, NRF_UART_EVENT_RXDRDY))
{
nrf_uart_event_clear(instance->uart.reg.p_uart, NRF_UART_EVENT_RXDRDY);
ch = (int)(nrf_uart_rxd_get(instance->uart.reg.p_uart));
}
return ch;
}
