display_hz.c

基于arm2410的一个简单的液晶屏驱动

#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <string.h>

int fd1;
void *address;

int
init_file (void)
{

  fd1 = open ("hzk16.bin", O_RDWR);

  if (fd1 < 0)
    {
      perror ("open() error");
      return -1;
    }

  address = mmap (NULL, 256 * 1024, PROT_READ, MAP_SHARED, fd1, 0);
  if (address == MAP_FAILED)
    {
      perror ("munmap() error=");
    }
}

int
close_file (void)
{
  if (munmap (address, 256 * 1024) < 0)
    {
      perror ("munmap() error");
    }

  close (fd1);
}

void
get_buf (unsigned char *hanzi, char *buf)
{

  unsigned long offset = ((hanzi[0] - 0xA1) * 94 + (hanzi[1] - 0xA1)) * 32L;

  memcpy (buf, address + offset, 32);
}

int
get_bit (unsigned char a, int bit)
{
  return (a & (1 << bit));
}

void
display_buf (unsigned char *buf)
{
  int i, j;
  unsigned char a1, a2;

  for (i = 0;i < 32; i++)
  {
	printf ("0x%02x ,",buf[i]);
  	if (i%8==7)printf ("\n");
  }

  for (i = 0; i < 32; i += 2)
    {
      a1 = buf[i];
      a2 = buf[i + 1];

      printf ("\n");
      for (j = 7; j >= 0; j--)
	{
	  if (get_bit (a1, j))
	    printf ("1");
	  else
	    printf (" ");
	}
      for (j = 7; j >= 0; j--)
	{
	  if (get_bit (a2, j))
	    printf ("1");
	  else
	    printf (" ");
	}

    }

}


int
main (void)
{
  char buf[32];

  //1.) open hzk.bin file
  init_file ();

  //2.) get hanzi font
  get_buf ("啊", buf);

  //3.) display a hanzi
  display_buf (buf);

  //4.) exit all
  close_file ();
}

//啊你好