本文主要是介绍CJ202二氧化碳传感器的数据ESP32解析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
CJ202传感器
esp32上的完整代码
主要有 驱动配置、数据解析
代码
app_uart.h
#ifndef _APP_UART_H_
#define _APP_UART_H_void uart_init(void (*post_co2)(char*, double));
int sendData(const char* data, int len);
void rx_task(void *arg);
void uart_intr_handler(void *arg);void (*fn_post_co2)(char*, double);extern int uart_read_value;#endif
app_uart.c
#include "app_uart.h"#include "driver/gpio.h"
#include "driver/uart.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "sdkconfig.h"
#include "string.h"
#include <math.h>const int RX_BUF_SIZE = 128;#define TXD_PIN (GPIO_NUM_13)
#define RXD_PIN (GPIO_NUM_15)#define UART_LOG_TAG "uart"int uart_read_value = 10;/*** 初始化串口*/
void uart_init(void (*fp)(char *, double)) {fn_post_co2 = fp;// 安装驱动,发送缓冲区设置为空uart_driver_install(UART_NUM_1, RX_BUF_SIZE * 2, 0, 0, NULL, 0);const uart_config_t uart_config = {.baud_rate = 9600,// .baud_rate = 256000,.data_bits = UART_DATA_8_BITS,.parity = UART_PARITY_DISABLE,.stop_bits = UART_STOP_BITS_1,.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,.rx_flow_ctrl_thresh = 122,.source_clk = UART_SCLK_APB,};// 设置参数uart_param_config(UART_NUM_1, &uart_config);// // 中断模式// uart_isr_register(UART_NUM_1, uart_intr_handler, NULL, ESP_INTR_FLAG_IRAM,// NULL); 设置引脚uart_set_pin(UART_NUM_1, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE,UART_PIN_NO_CHANGE);// 循环读取数值xTaskCreate(rx_task, "uart_rx_task", 1024 * 2, NULL, configMAX_PRIORITIES,NULL);
}/*** 发送数据*/
int sendData(const char *data, int len) {const int txBytes = uart_write_bytes(UART_NUM_1, data, len);ESP_LOGI(UART_LOG_TAG, "Wrote %d bytes: %s", txBytes, data);return txBytes;
}/*** 接收数据任务*/
void rx_task(void *arg) {uint8_t header[] = {0x42, 0x4D};int header_len = sizeof(header);int one_frame_len = 16;static const char *RX_TASK_TAG = "RX_TASK";esp_log_level_set(RX_TASK_TAG, ESP_LOG_INFO);uint8_t *data = (uint8_t *)malloc(RX_BUF_SIZE + 1);while (1) {int header_start_index = -1;int rxBytes =uart_read_bytes(UART_NUM_1, data, RX_BUF_SIZE, 1000 / portTICK_RATE_MS);// 数据是否够长if (rxBytes < one_frame_len) {continue;}// 找到起始位for (int i = 0; i < rxBytes - header_len; i++) {if (memcmp(&data[i], header, header_len) == 0) {header_start_index = i;break;}}if (header_start_index < 0) {continue;}// 数据是否还够长if (rxBytes - header_start_index < one_frame_len) {continue;}uint8_t sum = 0;for (int i = 0; i < one_frame_len - 1; i++) {int index = header_start_index + i;sum += data[index];}int last = header_start_index + 15;ESP_LOGD(UART_LOG_TAG, "check sum:%02X-%d, byte15:%02X-%d, is equal: %d",sum, sum, data[last], data[last], sum == data[last]);for (int i = 0; i < one_frame_len; i++) {if (i > 0 && i % 5 == 0) {printf(" ");}int index = header_start_index + i;printf("%02X", data[index]);}int value =((int)data[header_start_index + 6] << 8) + data[header_start_index + 7];printf("; %02X %02X value: %d \n", data[header_start_index + 6],data[header_start_index + 7], value);uart_read_value = value;if (sum == data[last] && fn_post_co2 != NULL) {(*fn_post_co2)("co2", value);}// vTaskDelay(3000 / portTICK_PERIOD_MS);vTaskDelay(1);}free(data);
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