在硬件平台： STM32 +SSD1963+4.3TFT(TP)+TFcard 实现了将显示数据存储为bmp文件的应用。
TFT应用为RGB565格式的16位色显示480*272分辨率，bmp文件RGB565格式的位图很多软件打不开，大部分是只支持RGB555的。因此做了两种类型 的代码。bmp文件存储在TF卡，以下代码已通过调试。
- #define LCD_READ_BUFFER_SIZE 2048//1024
- #define FILE_HEADER_SIZE 0x36//0x3E//0x36
- #define RGB565_FILE_HEADER_SIZE 0x46//0x3E//0x36
- uint8_t LCDReadDataBuffer[LCD_READ_BUFFER_SIZE];//[WAVEFRAMEBUFFERSIZE+1];
- const char bmpname[21][11]={"DSO01.bmp","DSO02.bmp","DSO03.bmp","DSO04.bmp","DSO05.bmp","DSO06.bmp","DSO07.bmp","DSO08.bmp","DSO09.bmp","DSO10.bmp","DSO11.bmp","DSO12.bmp","DSO13.bmp","DSO14.bmp","DSO15.bmp","DSO16.bmp","DSO17.bmp","DSO18.bmp","DSO19.bmp","DSO20.bmp","DSO21.bmp"};
- #ifdef RGB565_FILE
- const char BmpHeaderRGB565[RGB565_FILE_HEADER_SIZE]={
- //file header
- 0x42,0x4D, //0x00~0x01,type"BM"
- 0x48,0xFC,0x03,0x00, //0x02~0x05,file size:16bit:480x2(RGB565)x272+0x36+2(result need Divisible by 4)
- 0x00,0x00,0x00,0x00, //0x06~0x09,reserved 0x00
- 0x46,0x00,0x00,0x00, //0x0A~0x0D,bmp data offset
- 0x38,0x00,0x00,0x00, //0x0E~0x11,bmp header size
- 0xE0,0x01,0x00,0x00, //0x12~0x15,width:480
- 0x10,0x01,0x00,0x00, //0x16~0x19,height:272
- 0x01,0x00, //0x1A~0x1B,planes:always"1"
- //information header
- 0x10,0x00, //0x1C~0x1D,bits per pixel:16bits;
- 0x03,0x00,0x00,0x00, //0x1E~0x21,compression:no
- 0x02,0xFC,0x03,0x00, //0x22~0x25,bmp data size:480*2(R5G6B5)*272+2(result need Divisible by 4)
- 0x00,0x00,0x00,0x00, //0x26~0x29,HResolution
- 0x00,0x00,0x00,0x00, //0x2A~0x2D,VResolution
- 0x00,0x00,0x00,0x00, //0x2E~0x31,colors
- 0x00,0x00,0x00,0x00, //0x32~0x35,important
- //Palettte: RGB565
- ///*
- 0x00,0xF8,0x00, //0x36~0x38,Blue mask:& 0xF800)>>8
- 0x00,0xE0,0x07, //0x39~0x3B,Green mask:& 0x07E0)>>3
- 0x00,0x00,0x1F, //0x3C~0x3E,Red mask:& 0x001F)<<3;
- 0x00,0x00,0x00, //0x3F~0x41,Alpha
- 0x00,0x00,0x00,0x00, //0x42~0x45,reserved
- //*/
- };
- #else //RGB555 bmp file
- const char BmpHeader[FILE_HEADER_SIZE]={
- //file header
- 0x42,0x4D, //0x00~0x01,type"BM"
- 0x38,0xFC,0x03,0x00, //0x02~0x05,file size:16bit:480x2(RGB565)x272+0x36+2(result need Divisible by 4)
- 0x00,0x00,0x00,0x00, //0x06~0x09,reserved 0x00
- 0x36,0x00,0x00,0x00, //0x0A~0x0D,bmp data offset
- 0x28,0x00,0x00,0x00, //0x0E~0x11,bmp header size
- 0xE0,0x01,0x00,0x00, //0x12~0x15,width:480
- 0x10,0x01,0x00,0x00, //0x16~0x19,height:272
- 0x01,0x00, //0x1A~0x1B,planes:always"1"
- //information header
- 0x10,0x00, //0x1C~0x1D,bits per pixel:16bits;
- 0x00,0x00,0x00,0x00, //0x1E~0x21,compression:no
- 0x02,0xFC,0x03,0x00, //0x22~0x25,bmp data size:480*2(R5G6B5)*272+2(result need Divisible by 4)
- 0x00,0x00,0x00,0x00, //0x26~0x29,HResolution
- 0x00,0x00,0x00,0x00, //0x2A~0x2D,VResolution
- 0x00,0x00,0x00,0x00, //0x2E~0x31,colors
- 0x00,0x00,0x00,0x00, //0x32~0x35,important
- //Palettte: RGB555 :no
- };
- #endif
- void LCDReadLine(u16 x,u16 y)
- {
- u32 i;
- u16 colordata;
- //u8 Rdata,Gdata;
- u8 Bdata;
-
- LcdSetArea(x,y,FRAMEBUFFER_COL-1,y);
- WriteCommand(0x2E);
- for(i = 0; i
- {
- colordata=ReadData();//LSB first
- #ifdef RGB565_FILE
- LCDReadDataBuffer[i*2]=(uint8_t)colordata;//LSB first
- LCDReadDataBuffer[i*2+1]=(uint8_t)(colordata>>8);//LSB first
- #else//RGB565==>RGB555
- //Rdata=(uint8_t)(colordata>>11);//mask:0xF800
- //Gdata=(uint8_t)((colordata&0x07E0)>>5);//mask:0x07E0
- Bdata=(uint8_t)(colordata&0x001F);//mask:0x001F
- LCDReadDataBuffer[i*2]=(uint8_t)(((colordata>>1)&0x03E0)|Bdata);//LSB first
- LCDReadDataBuffer[i*2+1]=(uint8_t)(colordata>>9);//LSB first
- #endif
-
- }
- }
- /*******************************************************************************
- LcdSaveBmp: 保存当前屏幕显示图像为BMP格式 输入：文件编号 返回值：0x00=成功
- *******************************************************************************/
- u8 LCDSaveBmp(u8 FileNum)
- {
- FIL bmpfile;
- UINT bw;
-
- FATFS fs;
- FRESULT res;
- u16 x=0, y=0;
- u8 fileend[]={0x00,0x00,0x00,0x00};
-
- // u8 testbuffer[]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
- // u8 i, j, k;
-
- if(FileNum>20) //max filenum:21
- {
- FileNum=0x00;
- }
- //open file to write
- res = f_mount(0, &fs);
- res = f_open(&bmpfile, bmpname[FileNum], FA_OPEN_EXISTING | FA_WRITE); //open picture file
- if(res != FR_OK)
- {
- res = f_open(&bmpfile, bmpname[FileNum], FA_CREATE_ALWAYS| FA_WRITE); //open picture file
- }
- if(res != FR_OK)
- {
- return res;
- }
-
- //header//FILE_HEADER_SIZE//BmpHeader
- // f_write(fil, &c, 1, &bw); /* Write a byte to the file */
- #ifdef RGB565_FILE
- res = f_write(&bmpfile,BmpHeaderRGB565,RGB565_FILE_HEADER_SIZE,&bw);
- if( res != FR_OK )
- {
- return res;
- }
- #else
- res = f_write(&bmpfile,BmpHeader,FILE_HEADER_SIZE,&bw);
- if( res != FR_OK )
- {
- return res;
- }
- #endif
- //
- // 0x0036; //data RGB555
- // 0x0046; //data RGB565
- for(y=0; y<272; y++)
- {
- x=0;
- //LCDReadBuffer(x,y,480*2);//line 480*2//480*RGB
- LCDReadLine(x,(271-y));//read data to LCDReadDataBuffer
- res = f_write(&bmpfile,LCDReadDataBuffer,480*2,&bw);
- if( res != FR_OK )
- {
- return res;
- }
- }
- f_write(&bmpfile,fileend, 2, &bw); /* Write bytes to the file */
- //read test
- // res = f_lseek(&bmpfile, bmpfile.fsize); /* Move to end of the file to append data */
- // res = f_lseek(&bmpfile, 0);/* Put file header */
- /*
- f_close(&bmpfile);
- f_open(&bmpfile, bmpname[FileNum], FA_OPEN_EXISTING | FA_READ);
- f_read(&bmpfile,LCDReadDataBuffer,LCD_READ_BUFFER_SIZE,&bw);
- */
- //close open file
- f_close(&bmpfile);
- f_mount(0, NULL);
- return FR_OK;
-
- }
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