FT_Hal_Utils.cpp

00001 #include "FT_Platform.h"
00002 #include "mbed.h"
00003 
00004 /* function to load jpg file from filesystem */
00005 /* return 0 if jpg is ok                     */
00006 /* return x_size and y_size of jpg           */
00007 
00008 int FT800::Load_jpg(char* filename, ft_int16_t* x_size, ft_int16_t* y_size)
00009 {
00010     unsigned char pbuff[8291];
00011     unsigned short marker;
00012     unsigned short length;
00013     unsigned char data[4];
00014 
00015     ft_uint16_t blocklen;
00016 
00017     FILE *fp = fopen(filename, "r");
00018     if(fp == NULL) return (-1);         // connot open file
00019 
00020     // search for 0xFFC0 marker
00021     fseek(fp, 0, SEEK_END);
00022     unsigned int Fsize = ftell(fp);
00023     fseek(fp, 2, SEEK_SET);
00024     fread(data,4,1,fp);
00025     marker = data[0] << 8 | data[1];
00026     length = data[2] << 8 | data[3];
00027     do {
00028         if(marker == 0xFFC0) break;
00029         if(marker & 0xFF00 != 0xFF00) break;
00030         if (fseek(fp, length - 2,SEEK_CUR) != 0) break;
00031         fread(data,4,1,fp);
00032         marker = data[0] << 8 | data[1];
00033         length = data[2] << 8 | data[3];
00034     } while(1);
00035     if(marker != 0xFFC0) return (-2);  // no FFC0 Marker, wrong format no baseline DCT-based JPEG
00036     fseek(fp, 1,SEEK_CUR);
00037     fread(data,4,1,fp);
00038     *y_size = (data[0] << 8 | data[1]);
00039     *x_size = (data[2] << 8 | data[3]);
00040 
00041     //if(*x_size > DispWidth || *y_size > DispHeight) return (-3);  // to big to fit on screen
00042 
00043     fseek(fp, 0, SEEK_SET);
00044     WrCmd32(CMD_LOADIMAGE);  // load a JPEG image
00045     WrCmd32(0);              //destination address of jpg decode
00046     WrCmd32(0);              //output format of the bitmap - default is rgb565
00047     while(Fsize > 0) {
00048         /* download the data into the command buffer by 8kb one shot */
00049         blocklen = Fsize>8192?8192:Fsize;
00050         /* copy the data into pbuff and then transfter it to command buffer */
00051         fread(pbuff,1,blocklen,fp);
00052         Fsize -= blocklen;
00053         /* copy data continuously into command memory */
00054         WrCmdBuf(pbuff, blocklen); //alignment is already taken care by this api
00055     }
00056     fclose(fp);
00057 
00058     return(0);
00059 }
00060 
00061 
00062 /* calibrate touch */
00063 ft_void_t FT800::Calibrate()
00064 {
00065     /*************************************************************************/
00066     /* Below code demonstrates the usage of calibrate function. Calibrate    */
00067     /* function will wait untill user presses all the three dots. Only way to*/
00068     /* come out of this api is to reset the coprocessor bit.                 */
00069     /*************************************************************************/
00070     {
00071 
00072         DLstart();                                       // start a new display command list
00073         DL(CLEAR_COLOR_RGB(64,64,64));       // set the clear color R, G, B
00074         DL(CLEAR(1,1,1));                    // clear buffers -> color buffer,stencil buffer, tag buffer
00075         DL(COLOR_RGB(0xff,0xff,0xff));       // set the current color R, G, B
00076         Text((DispWidth/2), (DispHeight/2), 27, OPT_CENTER, "Appuyez sur les points");  // draw Text at x,y, font 27, centered
00077         Calibrate(0);                                    // start the calibration of touch screen
00078         Flush_Co_Buffer();                               // download the commands into FT800 FIFO
00079         WaitCmdfifo_empty();                             // Wait till coprocessor completes the operation
00080     }
00081 }
00082 
00083