ledshow2.c

来自「一个在linux下的驱动程序的例子」· C语言 代码 · 共 41 行

#include "stdio.h"
#include "sys/types.h"
#include "sys/ioctl.h"
#include "stdlib.h"
#include "termios.h"
#include "sys/stat.h"
#include "fcntl.h"
#include "sys/time.h"

unsigned char ledtab[]={0x0e,0x0d,0x0b,0x07};


int main(void)
{int pb_dev,m,len,i;
	
   
  len=1;
  pb_dev=open("/dev/io_pb",O_RDWR);
 if(pb_dev<0)
 {
  printf("can't open device\n");
  return(0);
 }

   printf("led test show. press ctrl+c to exit  \n");
	 
	
	while(1)
	{
		
	for(i=0;i<4;i++)
	{
		m=write(pb_dev,&ledtab[i],len);
		usleep(50000);
	}
	}
        close(pb_dev);
	return 0;

}