/** * 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; }