LCD—TFT屏显示位图问题

wesleo · 发表于 2011-12-10 15:41:41

小弟最近做一个bmp位图的简单显示程序，先用软件把24位的bmp位图转成数组，然后把图像数据区数据按三字节读出，获得bmp的BGR数据，然后编写算法转成5:6:5适合lcd显示的16位数据，下载后，发现图像水平方向出现两幅一样的图，垂直方向不能完全显示，以下为24位真彩数据转换5:6:5的代码：
void ili9320_DrawPicture(u16 StartX,u16 StartY,u16 EndX,u16 EndY,u16 *pic)
{
      u32 i, total;
      u16 data1,data2,data3;
      u16 data4;
      u16 *picturepointer = pic;
      u16 x,y;
      u16 R,G,B;
      u16 color;
      x=StartX;
      y=StartY;
      total = (EndX - StartX + 1)*(EndY - StartY + 1 );
       for (i=0;i<total/2;i++)
      {
           data1 = *picturepointer;
           data2 = *(picturepointer + 1);
           data3 = *(picturepointer + 2);           /* RGB24转换为RGB565 */
          /* 红色r占5为屏蔽低三位绿色g占6为屏蔽低两位   蓝色b占5为屏蔽低三位 */
          data3 = data1 & (~(0x07));
          data2 = data2 & (~(0x03));
          data1 = data3 & (~(0x7));
          R = (unsigned short)data3 << 8;
          G = (unsigned short)data2 << 3;
          B = (unsigned short)data1 >> 3;
          color = R | G | B;
          ili9320_SetPoint(x,y,color);
         x++;
          if(x>EndX)
              {
                 y++;
                 x=StartX;
              }
          picturepointer += 3;
     }
}
请问各位高手，这是什么问题了，ili9320_SetPoint(x,y,color)为画点和颜色的函数，没有问题。为什么图片不能正常显示