fl2440——Platform

/********************************************************************************* * Copyright: (C) 2017 TangBin<tangbinmvp@gmail.com> * All rights reserved. * * Filename: button.c * Description: This file * * Version: 1.0.0(04/04/2017) * Author: TangBin <tangbinmvp@gmail.com> * ChangeLog: 1, Release initial version on "04/04/2017 11:51:41 AM" * ********************************************************************************/ #include"plat_ioctl.h" #include<stdio.h> #include<stdlib.h> #include<fcntl.h> #include<unistd.h> #include<sys/ioctl.h> #include<sys/time.h> #include<errno.h> #define PLATDRV_MAGIC 0x60 #define LED_OFF _IO (PLATDRV_MAGIC, 0x18) #define LED_ON _IO (PLATDRV_MAGIC, 0x19) #define KEY1 0x1 #define KEY2 0x2 #define KEY3 0x4 #define KEY4 0x8 /******************************************************************************** * Description: * Input Args: * Output Args: * Return Value: ********************************************************************************/ int main (int argc, char **argv) { int fd_button; int fd_led; int status; int retval; fd_set rfds; fd_button =open("/dev/button",O_RDWR); if(fd_button <0) goto err1; fd_led =open("/dev/led",O_RDWR); if(fd_led <0) goto err2; FD_ZERO(&rfds); FD_SET(fd_button,&rfds); for(;;) { retval =select(fd_button+1,&rfds,NULL,NULL,NULL); if(retval <0) { printf("error!%s\n",strerror(errno)); break; } else if(retval ==0) continue; else { if(FD_ISSET(fd_button,&rfds) >0) { read(fd_button, &status, sizeof(status)); } } if(status &KEY1) { ioctl(fd_led, LED_ON, 0); printf("led0 on\n"); sleep(2); ioctl(fd_led, LED_OFF, 0); } if(status &KEY2) { ioctl(fd_led, LED_ON, 1); printf("led1 on\n"); sleep(2); ioctl(fd_led, LED_OFF, 1); } if(status &KEY3) { ioctl(fd_led, LED_ON, 2); printf("led2 on\n"); sleep(2); ioctl(fd_led, LED_OFF, 2); } if(status &KEY4) { ioctl(fd_led, LED_ON, 3); printf("led3 on\n"); sleep(2); ioctl(fd_led, LED_OFF, 3); } } close(fd_button); close(fd_led); err1: perror("open device buttons error!"); close(fd_button); err2: perror("open device leds error!"); close(fd_led); return 0; } /* ----- End of main() ----- */

./a.out 之后，按下对应的按键，LED灯就会亮2s，再灭掉。