ESP32 Forum

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static void IRAM_ATTR uart_intr_handle(void *arg)
{
  uint16_t rx_fifo_len, status;
  uint16_t i=0;
  
  status = UART0.int_st.val; // read UART interrupt Status
  rx_fifo_len = UART0.status.rxfifo_cnt; // read number of bytes in UART buffer
  
  while(rx_fifo_len)
  {
   rxbuf[i++] = UART0.fifo.rw_byte; // read all bytes
   rx_fifo_len--;
  }

 // after reading bytes from buffer clear UART interrupt status
 uart_clear_intr_status(EX_UART_NUM, UART_RXFIFO_FULL_INT_CLR|UART_RXFIFO_TOUT_INT_CLR);

// a test code or debug code to indicate UART receives successfully,
// you can redirect received byte as echo also
 uart_write_bytes(EX_UART_NUM, (const char*) "RX Done", 7);
}

Code: Select all

void app_main()
{
	wifi_init_sta();
	vTaskDelay(10000 / portTICK_RATE_MS);
    	esp_log_level_set(uart_tag, ESP_LOG_INFO);
	uart_config_t uart_config = {
		.baud_rate = 9600,
		.data_bits = UART_DATA_8_BITS,
		.parity = UART_PARITY_DISABLE,
		.stop_bits = UART_STOP_BITS_1,
		.flow_ctrl = UART_HW_FLOWCTRL_DISABLE
	};

	ESP_ERROR_CHECK(uart_param_config(EX_UART_NUM, &uart_config));

	//Set UART log level
	esp_log_level_set(uart_tag, ESP_LOG_INFO);

	//Set UART pins (using UART0 default pins ie no changes.)
	ESP_ERROR_CHECK(uart_set_pin(EX_UART_NUM_2, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));

	//Install UART driver, and get the queue.
	ESP_ERROR_CHECK(uart_driver_install(EX_UART_NUM, BUF_SIZE * 2, 0, 0, NULL, 0));

	// release the pre registered UART handler/subroutine
	ESP_ERROR_CHECK(uart_isr_free(EX_UART_NUM));

	// register new UART subroutine
	ESP_ERROR_CHECK(uart_isr_register(EX_UART_NUM,uart_intr_handle, NULL, ESP_INTR_FLAG_IRAM, &handle_console));

	// enable RX interrupt
	ESP_ERROR_CHECK(uart_enable_rx_intr(EX_UART_NUM));
}