esp32-c3 IIC连续发送数据代码

以下是ESP32-C3的IIC连续发送数据的代码示例：

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2c.h"

#define I2C_MASTER_SCL_IO           27          /*!< GPIO number for I2C master clock */
#define I2C_MASTER_SDA_IO           26          /*!< GPIO number for I2C master data  */
#define I2C_MASTER_NUM              I2C_NUM_0   /*!< I2C port number for master dev */
#define I2C_MASTER_TX_BUF_DISABLE   0           /*!< I2C master do not need buffer */
#define I2C_MASTER_RX_BUF_DISABLE   0           /*!< I2C master do not need buffer */
#define I2C_MASTER_FREQ_HZ          100000      /*!< I2C master clock frequency */

#define I2C_SLAVE_ADDR              0x68        /*!< ESP32-C3 I2C slave address */
#define I2C_SLAVE_WRITE_BIT         0           /*!< I2C slave write bit */
#define I2C_SLAVE_ACK_CHECK_EN      1           /*!< I2C slave ack check enable */
#define I2C_SLAVE_ACK_CHECK_DIS     0           /*!< I2C slave ack check disable */
#define I2C_SLAVE_ACK_VAL           0           /*!< I2C slave ack value */
#define I2C_SLAVE_NACK_VAL          1           /*!< I2C slave nack value */

/**
 * @brief I2C master initialization
 */
static esp_err_t i2c_master_init(void)
{
    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,
        },
    };
    return i2c_param_config(I2C_MASTER_NUM, &conf) == ESP_OK ? i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0) : ESP_FAIL;
}

/**
 * @brief I2C slave initialization
 */
static esp_err_t i2c_slave_init(void)
{
    i2c_config_t conf = {
        .mode = I2C_MODE_SLAVE,
        .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,
        .slave = {
            .addr_10bit_en = 0,
            .slave_addr = I2C_SLAVE_ADDR,
        },
    };
    return i2c_param_config(I2C_MASTER_NUM, &conf) == ESP_OK ? i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0) : ESP_FAIL;
}

/**
 * @brief I2C master continuous send data task
 */
static void i2c_master_task(void *arg)
{
    uint8_t data[2] = {0x01, 0x02};
    while (1) {
        esp_err_t ret;
        i2c_cmd_handle_t cmd = i2c_cmd_link_create();
        i2c_master_start(cmd);
        i2c_master_write_byte(cmd, (I2C_SLAVE_ADDR << 1) | I2C_SLAVE_WRITE_BIT, I2C_SLAVE_ACK_CHECK_EN);
        i2c_master_write(cmd, data, 2, I2C_SLAVE_ACK_CHECK_EN);
        i2c_master_stop(cmd);
        ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
        i2c_cmd_link_delete(cmd);
        if (ret == ESP_OK) {
            printf("I2C Master send data success\n");
        } else {
            printf("I2C Master send data failed\n");
        }
        vTaskDelay(1000 / portTICK_RATE_MS);
    }
}

/**
 * @brief I2C slave receive data task
 */
static void i2c_slave_task(void *arg)
{
    i2c_slave_set_addr(I2C_MASTER_NUM, I2C_SLAVE_ADDR);
    i2c_cmd_handle_t cmd;
    while (1) {
        cmd = i2c_cmd_link_create();
        i2c_master_start(cmd);
        i2c_master_write_byte(cmd, (I2C_SLAVE_ADDR << 1) | I2C_SLAVE_WRITE_BIT, I2C_SLAVE_ACK_CHECK_EN);
        i2c_master_stop(cmd);
        esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
        i2c_cmd_link_delete(cmd);
        if (ret != ESP_OK) {
            printf("I2C Slave receive data failed\n");
        }
        vTaskDelay(1000 / portTICK_RATE_MS);
    }
}

void app_main()
{
    i2c_master_init();
    i2c_slave_init();
    xTaskCreate(i2c_master_task, "i2c_master_task", 2048, NULL, 10, NULL);
    xTaskCreate(i2c_slave_task, "i2c_slave_task", 2048, NULL, 10, NULL);
}

在该示例中，I2C主任务通过`i2c_master_write`函数向I2C从设备连续发送2个字节的数据。I2C从任务在循环中等待I2C主设备发送数据。当I2C主设备发送数据时，I2C从设备会通过`i2c_master_start`函数开始接收数据。

如果I2C主设备成功发送数据，则会在串行监视器中看到"I2C主发送数据成功"的消息。如果I2C从设备成功接收数据，则会在串行监视器中看到"I2C从接收数据成功"的消息。