帮我写一段I2C一主多从机 读写控制 C语言程序

好的，下面是一个简单的示例程序，演示了如何使用I2C进行一主多从机的读写控制：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/i2c-dev.h>

#define I2C_BUS "/dev/i2c-1"
#define I2C_SLAVE_ADDR1 0x50
#define I2C_SLAVE_ADDR2 0x51

int main()
{
    int fd;
    uint8_t data1[] = {0x01, 0x02, 0x03, 0x04};
    uint8_t data2[] = {0x05, 0x06, 0x07, 0x08};
    uint8_t read_data1[4];
    uint8_t read_data2[4];

    // 打开I2C总线
    fd = open(I2C_BUS, O_RDWR);
    if (fd < 0) {
        perror("Failed to open I2C bus");
        exit(1);
    }

    // 设置从机地址1
    if (ioctl(fd, I2C_SLAVE, I2C_SLAVE_ADDR1) < 0) {
        perror("Failed to set I2C slave address1");
        exit(1);
    }

    // 写入数据到从机1
    if (write(fd, data1, sizeof(data1)) != sizeof(data1)) {
        perror("Failed to write data to I2C slave1");
        exit(1);
    }

    // 读取从机1返回的数据
    if (read(fd, read_data1, sizeof(read_data1)) != sizeof(read_data1)) {
        perror("Failed to read data from I2C slave1");
        exit(1);
    }

    // 设置从机地址2
    if (ioctl(fd, I2C_SLAVE, I2C_SLAVE_ADDR2) < 0) {
        perror("Failed to set I2C slave address2");
        exit(1);
    }

    // 写入数据到从机2
    if (write(fd, data2, sizeof(data2)) != sizeof(data2)) {
        perror("Failed to write data to I2C slave2");
        exit(1);
    }

    // 读取从机2返回的数据
    if (read(fd, read_data2, sizeof(read_data2)) != sizeof(read_data2)) {
        perror("Failed to read data from I2C slave2");
        exit(1);
    }

    // 关闭I2C总线
    close(fd);

    // 打印读取到的数据
    printf("Read data from I2C slave1: ");
    for (int i = 0; i < sizeof(read_data1); i++) {
        printf("%02x ", read_data1[i]);
    }
    printf("\n");

    printf("Read data from I2C slave2: ");
    for (int i = 0; i < sizeof(read_data2); i++) {
        printf("%02x ", read_data2[i]);
    }
    printf("\n");

    return 0;
}

在上面的示例程序中，我们打开I2C总线并设置从机地址1，然后写入数据到从机1，并读取从机1返回的数据。接着，我们设置从机地址2，写入数据到从机2，并读取从机2返回的数据。最后，我们关闭I2C总线并打印读取到的数据。