IIC设备驱动程序（九）————用户态直接访问IIC设备

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参考上一个微博：IIC设备驱动程序（八）————dev-interface

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include "i2c-dev.h"/* i2c_usr_test </dev/i2c-0> <dev_addr> r addr * i2c_usr_test </dev/i2c-0> <dev_addr> w addr val */void print_usage(char *file){    printf("%s </dev/i2c-0> <dev_addr> r addr\n", file);    printf("%s </dev/i2c-0> <dev_addr> w addr val\n", file);}int main(int argc, char **argv){    int fd;    unsigned char addr, data;    int dev_addr;    if ((argc != 5) && (argc != 6))    {        print_usage(argv[0]);        return -1;    }    fd = open(argv[1], O_RDWR);    if (fd < 0)    {        printf("can't open %s\n", argv[1]);        return -1;    }    dev_addr = strtoul(argv[2], NULL, 0);    if (ioctl(fd, I2C_SLAVE, dev_addr) < 0)    {            /* ERROR HANDLING; you can check errno to see what went wrong */            printf("set addr error!\n");        return -1;    }    if (strcmp(argv[3], "r") == 0)    {        addr = strtoul(argv[4], NULL, 0);        data = i2c_smbus_read_word_data(fd, addr);        printf("data: %c, %d, 0x%2x\n", data, data, data);    }    else if ((strcmp(argv[3], "w") == 0) && (argc == 6))    {        addr = strtoul(argv[4], NULL, 0);        data = strtoul(argv[5], NULL, 0);        i2c_smbus_write_byte_data(fd, addr, data);          }    else    {        print_usage(argv[0]);        return -1;    }    return 0;}

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