#include <stdio.h>
#include <time.h>

FILE *tgt;

void dot(int b)
{
  char c=b?0xff:0x00;
  fputc(c,tgt); fputc(c,tgt); fputc(c,tgt); fputc(0,tgt);
}

int main()
{
  struct timespec time1, time2;
  int temp,i,j,m=0;
  tgt=fopen("/dev/fb0","wb");
  for(j=0; j<8; ++j)
  {
    fseek(tgt, j*4*1024, 0);
    for(i=0; i<11; ++i)
      dot(0);
  }
  while (1)
  {
    clock_gettime(CLOCK_REALTIME, &time1);
    fseek(tgt, 0*4*1024, 0);
    j=(time1.tv_sec/100)%10;
    for(i=0; i<10; ++i)
      dot(i<=j);
    fseek(tgt, 1*4*1024, 0);
    j=(time1.tv_sec/10)%10;
    for(i=0; i<10; ++i)
      dot(i<=j);
    fseek(tgt, 2*4*1024, 0);
    j=(time1.tv_sec)%10;
    for(i=0; i<10; ++i)
      dot(i<=j);
    fseek(tgt, 4*4*1024, 0);
    j=(time1.tv_nsec/100000000)%10;
    for(i=0; i<10; ++i)
      dot(i<=j);
    fseek(tgt, 5*4*1024, 0);
    j=(time1.tv_nsec/10000000)%10;
    for(i=0; i<10; ++i)
      dot(i<=j);
    fseek(tgt, 6*4*1024, 0);
    j=(time1.tv_nsec/1000000)%10;
    for(i=0; i<10; ++i)
      dot(i<=j);
    clock_gettime(CLOCK_REALTIME, &time2);
    j=1000000000*(time2.tv_sec-time1.tv_sec)+(time2.tv_nsec-time1.tv_nsec);
    if (j>m)
    {
      printf("%ld\n",m=j);
    }
  }
  return 0;
}