/**************************************************************** Institue of Automation,Chinese Academy of Sciences* Beijing Hyesco Embedded System Co.,Ltd.* www.hyesco.com* File Name: * Description: PC14、PC15 Control* Author: ***************************************************************/#include <stdio.h>#include <string.h>#include <malloc.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <signal.h>#define	DTime	50static void Delay(int);int main(void){	int fd,count;	int i=100;  unsigned long rgcon;		//以可讀、寫的方式打開設備文件	if((fd=open("/dev/led",O_RDWR))==-1)		{			perror("open error");			exit(1);		}		//循環i次	while(i--)		{    printf("Beeper and BKlight\r\n");	    		    //PC14、PC15均置為1		rgcon = 0x1 << 15 | 0x1 << 14;    if((count=write(fd,(char *)&rgcon,4))!=4)			{			perror("write1 error");			exit(1);			}		Delay(DTime);		//PC14、PC15均清0    rgcon = 0;    if((count=write(fd,(char *)&rgcon,4))!=4)        {               	perror("write1 error");          exit(1);        }    Delay(DTime);    }                	//關閉設備文件		close(fd);	return 0;}static void Delay(int x){	int i,j,k;	for(i=0;i<x;i++)		for(j=0;j<0xff;j++)			for(k=0;k<0xff;k++);}