137 lines
4.9 KiB
C
137 lines
4.9 KiB
C
/* Uart Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_system.h"
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#include "nvs_flash.h"
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#include "driver/uart.h"
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#include "freertos/queue.h"
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#include "esp_log.h"
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#include "soc/uart_struct.h"
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static const char *TAG = "uart_events";
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/**
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* This example shows how to use the UART driver to handle special UART events.
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*
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* It also reads data from UART0 directly, and echoes it to console.
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*
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* - port: UART0
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* - rx buffer: on
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* - tx buffer: on
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* - flow control: off
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* - event queue: on
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* - pin assignment: txd(default), rxd(default)
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*/
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#define EX_UART_NUM UART_NUM_0
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#define BUF_SIZE (1024)
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static QueueHandle_t uart0_queue;
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static void uart_event_task(void *pvParameters)
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{
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uart_event_t event;
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size_t buffered_size;
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uint8_t* dtmp = (uint8_t*) malloc(BUF_SIZE);
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for(;;) {
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//Waiting for UART event.
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if(xQueueReceive(uart0_queue, (void * )&event, (portTickType)portMAX_DELAY)) {
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ESP_LOGI(TAG, "uart[%d] event:", EX_UART_NUM);
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switch(event.type) {
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//Event of UART receving data
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/*We'd better handler data event fast, there would be much more data events than
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other types of events. If we take too much time on data event, the queue might
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be full.
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in this example, we don't process data in event, but read data outside.*/
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case UART_DATA:
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uart_get_buffered_data_len(EX_UART_NUM, &buffered_size);
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ESP_LOGI(TAG, "data, len: %d; buffered len: %d", event.size, buffered_size);
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break;
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//Event of HW FIFO overflow detected
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case UART_FIFO_OVF:
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ESP_LOGI(TAG, "hw fifo overflow\n");
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//If fifo overflow happened, you should consider adding flow control for your application.
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//We can read data out out the buffer, or directly flush the rx buffer.
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uart_flush(EX_UART_NUM);
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break;
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//Event of UART ring buffer full
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case UART_BUFFER_FULL:
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ESP_LOGI(TAG, "ring buffer full\n");
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//If buffer full happened, you should consider encreasing your buffer size
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//We can read data out out the buffer, or directly flush the rx buffer.
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uart_flush(EX_UART_NUM);
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break;
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//Event of UART RX break detected
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case UART_BREAK:
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ESP_LOGI(TAG, "uart rx break\n");
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break;
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//Event of UART parity check error
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case UART_PARITY_ERR:
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ESP_LOGI(TAG, "uart parity error\n");
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break;
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//Event of UART frame error
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case UART_FRAME_ERR:
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ESP_LOGI(TAG, "uart frame error\n");
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break;
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//UART_PATTERN_DET
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case UART_PATTERN_DET:
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ESP_LOGI(TAG, "uart pattern detected\n");
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break;
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//Others
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default:
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ESP_LOGI(TAG, "uart event type: %d\n", event.type);
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break;
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}
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}
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}
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free(dtmp);
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dtmp = NULL;
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vTaskDelete(NULL);
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}
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/* Configure the UART events example */
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void app_main()
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{
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uart_config_t uart_config = {
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.baud_rate = 115200,
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.data_bits = UART_DATA_8_BITS,
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.parity = UART_PARITY_DISABLE,
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.stop_bits = UART_STOP_BITS_1,
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.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
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.rx_flow_ctrl_thresh = 122,
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};
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//Set UART parameters
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uart_param_config(EX_UART_NUM, &uart_config);
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//Set UART log level
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esp_log_level_set(TAG, ESP_LOG_INFO);
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//Install UART driver, and get the queue.
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uart_driver_install(EX_UART_NUM, BUF_SIZE * 2, BUF_SIZE * 2, 10, &uart0_queue, 0);
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//Set UART pins (using UART0 default pins ie no changes.)
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uart_set_pin(EX_UART_NUM, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
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//Set uart pattern detect function.
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uart_enable_pattern_det_intr(EX_UART_NUM, '+', 3, 10000, 10, 10);
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//Create a task to handler UART event from ISR
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xTaskCreate(uart_event_task, "uart_event_task", 2048, NULL, 12, NULL);
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//process data
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uint8_t* data = (uint8_t*) malloc(BUF_SIZE);
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do {
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int len = uart_read_bytes(EX_UART_NUM, data, BUF_SIZE, 100 / portTICK_RATE_MS);
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if(len > 0) {
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ESP_LOGI(TAG, "uart read : %d", len);
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uart_write_bytes(EX_UART_NUM, (const char*)data, len);
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}
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} while(1);
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}
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