flashled.c

Six objects here: The document you re reading & its Chinese version Set of "HWDesign" includes

#include <stdio.h>
#include "usb-mn-ioctls.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <asm/types.h>

int main(int argc, char* argv[])
{
  if(argc!=4) {
    printf("flashLED usage: flashLED <delay-time> <turn-times> <LEDnum>\n");
    printf("\tdelay-time:enter zero to get 0.5sec delay\n");
    printf("\tturn-times:enter zero flash for ever,enter one flash one time\n");
    printf("\tLEDnum:0->1st LED; LEDnum:1->2nd LED; LEDnum:A->both of them\n");
    
    exit(-1);
  }
  /* argv[1] means the time of delay(0 means 0.5s)
   * argv[2] means the times of turn
   * argv[3] means which LED U want to operate on
   */

  int fd=open("/dev/MiniNurse",O_WRONLY);
  if (fd<0) {
    printf("canNOT open Device.\n");
    exit(-1);
  }

  int delay = *argv[1]-48;
  delay = (delay==0) ? .5 : delay;
  int turn = *argv[2]-48;

  printf("turn:%d\n",turn);
  
  __u16 LEDnum;

  switch (*argv[3]) {
    case '0':
      LEDnum = 0x04;    
      break;
    case '1':
      LEDnum = 0x08;
      break;
    case 'A':
      LEDnum = 0x0C;
      break;
    
  default:
    printf("arg:%c to this cmd is error!\n",*argv[3]);    
    exit(-1);
    
  }

   do {
     //ioctl(fd,MN_LEDoff,LEDnum);
     ioctl(fd,MN_LEDon,LEDnum);
     sleep(delay);
     ioctl(fd,MN_LEDoff,LEDnum);
     sleep(delay);
     turn--;     
   } while(turn);

   ioctl(fd,MN_LEDoff,0x0C);
   close(fd);
   return 0;
}