esp32/i2c_sh3x33/main/i2c_simple_main.c

#include <stdio.h>
#include "esp_log.h"
#include "driver/i2c.h"
#include "i2c_sht3x.h" 

static const char *TAG = "i2c-sht3x";//"i2c-simple-example";

#define I2C_MASTER_SCL_IO           GPIO_NUM_14//CONFIG_I2C_MASTER_SCL      /*!< GPIO number used for I2C master clock */
#define I2C_MASTER_SDA_IO           GPIO_NUM_4//CONFIG_I2C_MASTER_SDA      /*!< GPIO number used for I2C master data  */
#define I2C_MASTER_NUM              0                          /*!< I2C master i2c port number, the number of i2c peripheral interfaces available will depend on the chip */
#define I2C_MASTER_FREQ_HZ          400000                     /*!< I2C master clock frequency */
#define I2C_MASTER_TX_BUF_DISABLE   0                          /*!< I2C master doesn't need buffer */
#define I2C_MASTER_RX_BUF_DISABLE   0                          /*!< I2C master doesn't need buffer */
#define I2C_MASTER_TIMEOUT_MS       1000

/**
 * @brief i2c master initialization
 */
static esp_err_t i2c_master_init(void)
{
    int i2c_master_port = I2C_MASTER_NUM;

    i2c_config_t conf = {
        .mode = I2C_MODE_MASTER,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .sda_pullup_en = GPIO_PULLUP_ENABLE,
        .scl_pullup_en = GPIO_PULLUP_ENABLE,
        .master.clk_speed = I2C_MASTER_FREQ_HZ,
    };

    i2c_param_config(i2c_master_port, &conf);

    return i2c_driver_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
}

// i2c_sht3x_task 任务。初始化 SHT3x工作于周期测量模式，获取环境温湿度数据
void i2c_sht3x_task(void* arg)
{
    // 配置I2C0-主机模式，400K，指定 SCL-14，SDA-4
    i2c_master_init();

    uint8_t recv_dat[6] = {0};
    float temperature = 0.0;
    float humidity = 0.0;

    ESP_LOGI(TAG, "esp32 sht3x project starting ……");
    
    sht3x_reset(); // 复位SHT3X
    if(sht3x_init() == ESP_OK) // 初始化SHT3X(周期测量模式)
        ESP_LOGI(TAG, "sht3x init ok.\n");
    else
        ESP_LOGE(TAG, "sht3x init fail.\n");
    vTaskDelay(1000 / portTICK_PERIOD_MS); //延时1s 等待SHT3X传感器内部采样完成

    for (;;)
    {
        if(sht3x_read_th_raw_dat(recv_dat) == ESP_OK) // 从SHT3X读取一次数据（周期测量模式下）
        {
            // 将SHT3X接收的6个字节数据进行CRC校验，并转换为温度值和湿度值
            if(sht3x_dat2float(recv_dat, &temperature, &humidity) == 0)
            {
                ESP_LOGI(TAG, "temperature = %.2f ℃,humidity = %.2f %%RH", temperature, humidity);
            }
            else
            {
                ESP_LOGE(TAG, "crc check fail.\n");
            }
        }
        else
        {
            ESP_LOGE(TAG, "read data from sht3x fail.\n");
        }

        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

void app_main(void)
{
    // 创建 i2c_sht3x_task 任务。初始化 SHT30工作于周期测量模式，获取环境温湿度数据
    xTaskCreate(i2c_sht3x_task, "i2c_sht3x_task", 2048, NULL, 3, NULL);
}