液晶显示BMP图片的路径如何设置？

只看该作者 · 2019-11-28 12:28

使用STM32的例程，可以显示图片，把图片换成其它BMP图片，修改Lcd_show_bmp(0, 0,&quot;/tupian.bmp&quot;);，并把图片放到SD卡，液晶不能显示图片，那么图片的路径是如何设置的？
void Lcd_show_bmp(unsigned short int x, unsigned short int y,unsigned char *pic_name)
{
      int i, j, k;
      int width, height, l_width;
      BYTE red,green,blue;
      BITMAPFILEHEADER bitHead;
      BITMAPINFOHEADER bitInfoHead;
      WORD fileType;

      unsigned int read_num;
      unsigned char tmp_name[20];
      sprintf((char*)tmp_name,&quot;0:%s&quot;,pic_name);

      f_mount(0, &bmpfs[0]);
      BMP_DEBUG_PRINTF(&quot;file mount ok \r\n&quot;);
      bmpres = f_open( &bmpfsrc , (char *)tmp_name, FA_OPEN_EXISTING | FA_READ);
      if(bmpres == FR_OK)
      {
            BMP_DEBUG_PRINTF(&quot;Open file success\r\n&quot;);
            f_read(&bmpfsrc,&fileType,sizeof(WORD),&read_num);
            if(fileType != 0x4d42)
            {
                     BMP_DEBUG_PRINTF(&quot;file is not .bmp file!\r\n&quot;);
                     return;
            }
            else
            {
                     BMP_DEBUG_PRINTF(&quot;Ok this is .bmp file\r\n&quot;);
            }
            f_read(&bmpfsrc,&bitHead,sizeof(tagBITMAPFILEHEADER),&read_num);
            showBmpHead(&bitHead);
            f_read(&bmpfsrc,&bitInfoHead,sizeof(BITMAPINFOHEADER),&read_num);
            showBmpInforHead(&bitInfoHead);
      }
      else
      {
            BMP_DEBUG_PRINTF(&quot;file open fail!\r\n&quot;);
            return;
      }
      width = bitInfoHead.biWidth;
      height = bitInfoHead.biHeight;
      l_width = WIDTHBYTES(width* bitInfoHead.biBitCount);
      if(l_width > 960)
      {
            BMP_DEBUG_PRINTF(&quot;\n SORRY, PIC IS TOO BIG (<=320)\n&quot;);
            return;
      }
      Lcd_GramScan( 3 );
      LCD_OpenWindow(x, y, width, height);
      /* 判断是否是24bit真彩色图 */
      if(bitInfoHead.biBitCount >= 24)
      {
            for(i=0;i< height; i++)
            {
                     /* 读取一行bmp的数据到数组pColorData里面 */
                     #if 0
                              for(j=0; j< l_width; j++)
                              {
                                    f_read(&bmpfsrc,pColorData+j,1,&read_num);
                              }
                     #elif 1
                              f_read(&bmpfsrc,pColorData,l_width/2,&read_num);
                              f_read(&bmpfsrc,pColorData+l_width/2,l_width/2,&read_num);
                     #else
                              f_read(&bmpfsrc,pColorData,l_width,&read_num);
                     #endif

                     for(j=0; j<width; j++)                                                                                           //一行有效信息
                     {
                              k = j*3;                                                                                                                                        //一行中第K个像素的起点
                              red = pColorData[k+2];
                              green = pColorData[k+1];
                              blue =       pColorData[k];
                              LCD_WR_Data(RGB24TORGB16(red,green,blue)); //写入LCD-GRAM
                     }
            }
      }
      else
      {
            BMP_DEBUG_PRINTF(&quot;SORRY, THIS PIC IS NOT A 24BITS REAL COLOR&quot;);
            return ;
      }
      f_close(&bmpfsrc);
}

液晶显示BMP图片的路径如何设置？

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