/**
* Begin asynchronous RX transfer (enable interrupt for data collecting)
* The used buffer is specified in the serial object, rx_buff
*
* @param obj The serial object
* @param rx The buffer for sending
* @param rx_length The number of words to transmit
* @param rx_width The bit width of buffer word
* @param handler The serial handler
* @param event The logical OR of events to be registered
* @param handler The serial handler
* @param char_match A character in range 0-254 to be matched
* @param hint A suggestion for how to use DMA with this transfer
*/
void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint)
{
// TODO: DMA usage is currently ignored
(void) hint;
/* Sanity check arguments */
MBED_ASSERT(obj);
MBED_ASSERT(rx != (void*)0);
MBED_ASSERT(rx_width == 8); // support only 8b width
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
serial_enable_event(obj, SERIAL_EVENT_RX_ALL, 0);
serial_enable_event(obj, event, 1);
// set CharMatch
obj->char_match = char_match;
serial_rx_buffer_set(obj, rx, rx_length, rx_width);
IRQn_Type irq_n = serial_get_irq_n(obj);
NVIC_ClearPendingIRQ(irq_n);
NVIC_DisableIRQ(irq_n);
NVIC_SetPriority(irq_n, 0);
NVIC_SetVector(irq_n, (uint32_t)handler);
NVIC_EnableIRQ(irq_n);
// following HAL function will enable the RXNE interrupt + error interrupts
HAL_UART_Receive_IT(huart, (uint8_t*)rx, rx_length);
}
void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint)
{
/* Sanity check arguments */
MBED_ASSERT(obj);
MBED_ASSERT(rx != (void*)0);
serial_rx_enable_event(obj, SERIAL_EVENT_RX_ALL, false);
serial_rx_enable_event(obj, event, true);
serial_set_char_match(obj, char_match);
serial_rx_buffer_set(obj, rx, rx_length, rx_width);
NVIC_ClearPendingIRQ(get_serial_irq_num(obj));
NVIC_DisableIRQ(get_serial_irq_num(obj));
NVIC_SetVector(get_serial_irq_num(obj), (uint32_t)handler);
NVIC_EnableIRQ(get_serial_irq_num(obj));
if (pUSART_S(obj)) {
_USART(obj).INTENSET.reg = SERCOM_USART_INTFLAG_RXC;
}
return;
}
