linux iic write

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

#define I2C_BUS "/dev/i2c-1"
#define DEVICE_ADDRESS 0x50

int main() {
    int file;
    char *bus = I2C_BUS;

    if ((file = open(bus, O_RDWR)) < 0) {
        perror("Failed to open the i2c bus");
        return 1;
    }

    if (ioctl(file, I2C_SLAVE, DEVICE_ADDRESS) < 0) {
        perror("Failed to acquire bus access and/or talk to slave");
        return 1;
    }

    char data[] = {0x01, 0x02, 0x03};
    if (write(file, data, sizeof(data)) != sizeof(data)) {
        perror("Failed to write to the i2c bus");
        return 1;
    }

    close(file);
    return 0;
}

gcc -o i2c_write i2c_write.c -li2c
sudo ./i2c_write