raspberrypi/gpio/light.c

/*
 * 设置PIN脚为1或0电位(电压)
 *
 */

#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <linux/type.h>
#include <ctype.h>


static int is_num(char *str)
{
    int i, len;
    for (i = 0, len = strlen(str); i < len; i++) {
        if (isdigit(str[i]) == 0) {
            printf("不是数字\n");
           return 1;
        }
    }

    return 0;
}

int main(int argc, char *argv[])
{
    if (argc != 3) {
        printf("Parameter error.\n");
        exit(1);
    }
    
    if (is_num(argv[1]) == 1) {
        printf("Parameter error, parameter 1 is PIN pin value\n");
        exit(1);
    }
    
    if (is_num(argv[2]) == 1) {
        printf("Parameter error, parameter 2 is true or false\n");
        exit(1);
    }

    int pin = atol(argv[1]);
    wiringPiSetup();

    pinMode(pin, OUTPUT);
    if (atol(argv[2]) == 1) {
        digitalWrite(pin, HIGH);
    }
    if (atol(argv[2]) == 0) {
        digitalWrite(pin, LOW);
    }
    return atol(argv[2]);
}