嵌入式开发板显示汉字

最近一直在做PXA270开发板做实验。。现将显示汉字的程序，整理一下。

首先有汉字库这个东西，这个东西类似一个二维数组，有94行，94列。行号叫区号，列号叫位号。这样可以有94x94个汉字。每一个汉字可以由区号+位号来得到。因为94化成二进制数要7位，所以要表示一个汉字就得14位。这样的编码就叫做区位码。所以区位码是14位。然而大家都知道一个汉字是由两个字节表示的。是16位。多了两位。由16位表示编码方式叫内码。内码与区位码的换算方式如下:

        区号=内码第一个字节-A1H

        位号=内码第二个字节-A1H

那么汉字的点阵的起始位置=(区号x94+位号)x点阵的字节数

有了上面的知识，来看开发板显示汉字的实例

1:下载汉字库hzk16

2:安装ascii.lib库

3：源码如下

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "ascii.lib"
#define SYS_BLACK  0x00000000
#define SYS_WHITE  0xffffffff
file *hzkfile=null;
unsigned char * chsTxt = "青梅不爱竹马";
short x,y;
short i;
unsigned char bufferTxt[2];
typedef unsigned long ColorType;
ColorType color = SYS_WHITE;

void DrawCharCHS(int x, int y, unsigned char c[2], ColorType color);

void fb_Text_16x16(int x, int y, unsigned char * dotCodes, ColorType color);

void fb_PutPixel(short x, short y, ColorType color/*, int xorm */);

void main()
{
 hzkFile = fopen("./hz16", "rb");
 x = 10, y = 40;
 for (i = 0; i < strlen(chsTxt); i += 2)
 {
  bufferTxt[0] = chsTxt[i];
  bufferTxt[1] = chsTxt[i + 1];
  DrawCharCHS(x, y, bufferTxt, color);
  x += 16;
 }
 fclose(hzkFile);
}
void DrawCharCHS(int x, int y, unsigned char c[2], ColorType color)
{
 unsigned char codes[32];
 short i;
 unsigned char ch, cl;
 unsigned long offset;

 if (hzkFile == NULL)
 {
  printf("No Chinese Character Library opened.\n");

  exit(1);
 }

 ch = c[0];
 cl = c[1];

 offset = ((ch - 0xa1) * 94L + (cl - 0xa1)) * 32L;

 fseek(hzkFile, offset, SEEK_SET);//通过区位号找到汉字
 fread(codes, 32, 1, hzkFile); 

 fb_Text_16x16(x, y, codes, color);
}

void fb_Text_16x16(int x, int y, unsigned char * dotCodes, ColorType color)
{
 int i, j, k;

 if (x < 0 || x >= SCREEN_WIDTH ||
  y < 0 || y >= SCREEN_HEIGHT)
 {
#ifdef ERR_DEBUG
  printf("DEBUG_INFO: Pixel out of screen range.\n");
  printf("DEBUG_INFO: x = %d, y = %d\n", x, y);
#endif
  return;
 }

 if (dotCodes == NULL)
 {
#ifdef ERR_DEBUG
  printf("DEBUG_INFO: Dot codes NULL.\n");
#endif
  return;
 }

 for(i = 0; i < 16; i++)
 {
  for (j = 0; j < 2; j++)
  {
   x += 8 * ( j + 1);

   for (k = 0; k < 8; k++)
   {
    x--;

    if ((dotCodes[2 * i + j] >> k) & 0x1)
    {
     fb_PutPixel(x, y, color);
    }
   }
  }

  x -= 8;
  ++y;
 }

 return;
}

void fb_PutPixel(short x, short y, ColorType color/*, int xorm */)
{
 void * currPoint;
   
 if (x < 0 || x >= SCREEN_WIDTH ||
  y < 0 || y >= SCREEN_HEIGHT)
 {
#ifdef ERR_DEBUG
  printf("DEBUG_INFO: Pixel out of screen range.\n");
  printf("DEBUG_INFO: x = %d, y = %d\n", x, y);
#endif
  return;
 }

 // Calculate address of specified point
 currPoint = (ByteType *)frame_base + y * LINE_SIZE + x * PIXEL_SIZE;

#ifdef DEBUG
  printf("DEBUG_INFO: x = %d, y= %d, currPoint = 0x%x\n", x, y, currPoint);
#endif

 switch (BPP)
 {
  case 8:
   *((ByteType *)currPoint) = (color & 0xff);
   break;
   
  case 16:
   *((WordType *)currPoint) = (color & 0xffff);
   break;
 }
 
 return;
}