S3C6410 按键控制LED应用程序 ---源代码

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <sys/ioctl.h>#define ON 0#define OFF 1int k_fd;int l_fd;int led_status[4] = {1,1,1,1};void change_led_status(int num,int status){led_status[num] = status;}void send_cmd(int num){int ret;if(led_status[num] == ON){ret = ioctl(l_fd,(num+1)*10 + OFF);if(ret < 0){printf("send cmd error!\n");return;}led_status[num] = OFF;}else{ret = ioctl(l_fd,(num+1)*10 + ON);if(ret < 0)                {                        printf("send cmd error!\n");                        return;                }                led_status[num] = ON;}return;}int choose_key(char *tmp){int i;int num;num = -1;for(i = 0; i < 6; i++){if(tmp[i] == '1')  num = i;}return num;}int ctrl_led(int led_key_num){switch(led_key_num){case 0:send_cmd(led_key_num);return 0;case 1: send_cmd(led_key_num);return 1;case 2:send_cmd(led_key_num);return 2;case 3:send_cmd(led_key_num);return 3;case 4:return 4;default:return -1;}}int main(int argc,char ** argv){int count;int num;int ret;//char key[6] = {'0','0','0','0','0','0'};k_fd = open("/dev/keys",0);if(k_fd < 0){printf("open keys dev error!\n");return -1;}l_fd = open("/dev/leds",0);if(l_fd < 0){printf("open leds dev error!\n");return -1;}while(1){char current_keys[6];count = read(k_fd,current_keys,sizeof(current_keys[0])*6);if(count < 0){perror("read keys:");}//printf("read bytes is :%d\n",count);/*if(read(fd,current_keys,sizeof current_keys) != sizeof current_keys){perror("read buttons:");//exit(1);}*///printf("%s\n",current_keys);num = choose_key(current_keys);if(num < 0){continue;}ret = ctrl_led(num);if(ret == 4){sleep(1);break;}}close(k_fd);close(l_fd);return 0;}