请大家帮我看下，为什么在LCD上没法显示呢，谢谢了
/*showbmp.c
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
typedef struct
{
char cfType; /* 文件类型, 必须为 "BM" (0x4D42) */
char cfSize; /* 文件的大小(字节) */
char cfReserved; /* 保留, 必须为 0 */
char cfoffBits; /* 位图阵列相对于文件头的偏移量(字节) */
} BITMAPFILEHEADER; /* 文件头结构 */
typedef struct
{
char ciSize; /* size of BITMAPINFOHEADER */
char ciWidth; /* 位图宽度(像素) */
char ciHeight; /* 位图高度(像素) */
char ciPlanes; /* 目标设备的位平面数, 必须置为1 */
char ciBitCount; /* 每个像素的位数, 1,4,8或24 */
char ciCompress; /* 位图阵列的压缩方法,0=不压缩 */
char ciSizeImage; /* 图像大小(字节) */
char ciXPelsPerMeter;/* 目标设备水平每米像素个数 */
char ciYPelsPerMeter;/* 目标设备垂直每米像素个数 */
char ciClrUsed; /* 位图实际使用的颜色表的颜色数 */
char ciClrImportant; /* 重要颜色索引的个数 */
} BITMAPINFOHEADER; /* 位图信息头结构 */
typedef struct
{
char rgbBlue;
char rgbGreen;
char rgbRed;
char rgbReserved;
} RGBQUAD;
BITMAPFILEHEADER FileHead;
BITMAPINFOHEADER InfoHead;
RGBQUAD rgbquad;
char *fbp = 0;
int xres = 0;
int yres = 0;
int bits_per_pixel = 0;
intshow_bmp( char *bmpfile );
long chartolong( char * string, int length );
/******************************************************************************
*
******************************************************************************/
int main(int argc, char *argv[] )
{
int fbfd = 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long int screensize = 0;
// Open the file for reading and writing
fbfd = open("/dev/fb0", O_RDWR);
if (!fbfd)
{
printf("Error cannot open framebuffer device.\n");
exit(1);
}
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo))
{
printf("Error reading fixed information.\n");
exit(2);
}
// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo))
{
printf("Error reading variable information.\n");
exit(3);
}
printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel );
xres = vinfo.xres;
yres = vinfo.yres;
bits_per_pixel = vinfo.bits_per_pixel;
// Figure out the size of the screen in bytes
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
// Map the device to memory
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,
fbfd, 0);
if ((int)fbp == -1)
{
printf("Error failed to map framebuffer device to memory.\n");
exit(4);
}
show_bmp( argv );
munmap(fbp, screensize);
close(fbfd);
return 0;
}
/******************************************************************************
*
******************************************************************************/
int show_bmp( char *bmpfile )
{
FILE *fp;
int rc;
int ciBitCount, ciWidth, ciHeight;
int line_x, line_y;
long int location = 0, BytesPerLine = 0;
char tmp;
/* 打开位图文件 */
fp = fopen( bmpfile, "rb" );
if (fp == NULL)
{
return( -1 );
}
/* 读取位图文件头 */
rc = fread( &FileHead, sizeof(BITMAPFILEHEADER), 1, fp );
if ( rc != 1)
{
fclose( fp );
return( -2 );
}
/* 判断位图的类型 */
if (memcmp(FileHead.cfType, "BM", 2) != 0)
{
fclose( fp );
return( -3 );
}
/* 读取位图信息头 */
rc = fread( (char *)&InfoHead, sizeof(BITMAPINFOHEADER),1, fp );
if ( rc != 1)
{
fclose( fp );
return( -4 );
}
ciWidth = (int) chartolong( InfoHead.ciWidth, 4 );
ciHeight = (int) chartolong( InfoHead.ciHeight, 4 );
ciBitCount =(int) chartolong( InfoHead.ciBitCount, 4 );
line_x = line_y = 0;
/*
while(!feof( fp ))
{
rc = fread( (char *)&rgbquad,sizeof(RGBQUAD), 1,fp );
if ( rc != 1)
{
break;
}
location = line_x * bits_per_pixel / 8 + (ciHeight - line_y - 1) * xres * bits_per_pixel / 8;
*(fbp + location) = rgbquad.rgbBlue;
*(fbp + location + 1) = rgbquad.rgbGreen;
*(fbp + location + 2) = rgbquad.rgbRed;
*(fbp + location + 3) = rgbquad.rgbReserved;
line_x++;
if ( line_x == ( ciWidth - 1 ))
{
line_x = 0;
line_y++;
}
}
*/
BytesPerLine = (ciWidth * ciBitCount + 31) / 32 * 4;
while(!feof( fp ))
{
rc = fread( tmp, BytesPerLine, 1,fp );
if (rc != 1 )
{
break;
}
location = (ciHeight - line_y - 1) * xres * bits_per_pixel / 8;
memcpy( (fbp + location) , tmp, BytesPerLine );
line_y++;
}
fclose( fp );
return( 0 );
}
/******************************************************************************
*
******************************************************************************/
long chartolong( char * string, int length )
{
long number;
if (length <= 4)
{
memset( &number, 0x00, sizeof(long));
memcpy( &number, string, length );
}
return( number );
}
首先我的FRAMEBUFFER是可以使用的，我曾经在编程实现过全屏蓝色的，我要显示的16位的，240*320的BMP图片，程序是可以编译通过的，但不知道为什么显示不出图片来，请大家帮我看下，我哪里出现错误了呢，谢谢了
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