Peter Drescher / Mbed 2 deprecated FT800_JPG

Loading JPG to FT800 screen

Dependencies:   FT800 mbed

Test program to load a JPG to a FT800 controlled lcd screen. First the graphics data have to be load to the FT800 buffer. The FT800 will decode the JPG data into a bitmap. In the second step this bitmap will displayed on the LCD.

main.cpp@1:c603024cbd1d, 2015-02-09 (annotated)

Committer:
dreschpe
Date:
Mon Feb 09 20:46:41 2015 +0000
Revision:
1:c603024cbd1d
Parent:
0:a6545392ca42 
Add some doku

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 0:a6545392ca42 1 /* Demo for mbed Library for FTDI FT800 Enbedded Video Engine "EVE"
dreschpe 0:a6545392ca42 2 * to show jpg file handling
dreschpe 0:a6545392ca42 3 * c by Peter Drescher, DC2PD 2014
dreschpe 0:a6545392ca42 4 * Released under the MIT License: http://mbed.org/license/mit */
dreschpe 0:a6545392ca42 5
dreschpe 0:a6545392ca42 6 #include "mbed.h"
dreschpe 0:a6545392ca42 7 #include "FT_Platform.h"
dreschpe 0:a6545392ca42 8
dreschpe 0:a6545392ca42 9 Serial pc(USBTX, USBRX); // tx, rx
dreschpe 0:a6545392ca42 10 DigitalOut myled(LED1);
dreschpe 0:a6545392ca42 11 FT800 TFT(p11,p12,p13,p14,p15,p16); // the FT800 is connected to SPI 11-13
dreschpe 0:a6545392ca42 12
dreschpe 0:a6545392ca42 13 LocalFileSystem local("local"); // filesystem to load jpg
dreschpe 0:a6545392ca42 14
dreschpe 0:a6545392ca42 15
dreschpe 0:a6545392ca42 16 /* function to load jpg file from internal filesystem */
dreschpe 1:c603024cbd1d 17 /* into FT800 buffer and decode JPG to bitmap */
dreschpe 0:a6545392ca42 18 /* return 0 if jpg is ok */
dreschpe 0:a6545392ca42 19 /* return x_size and y_size of jpg */
dreschpe 0:a6545392ca42 20
dreschpe 0:a6545392ca42 21 int load_jpg(char* filename, ft_int16_t* x_size, ft_int16_t* y_size)
dreschpe 0:a6545392ca42 22 {
dreschpe 0:a6545392ca42 23 unsigned char pbuff[8291];
dreschpe 0:a6545392ca42 24 unsigned short marker;
dreschpe 0:a6545392ca42 25 unsigned short length;
dreschpe 0:a6545392ca42 26 unsigned char data[4];
dreschpe 0:a6545392ca42 27
dreschpe 0:a6545392ca42 28
dreschpe 0:a6545392ca42 29 ft_uint16_t blocklen;
dreschpe 0:a6545392ca42 30
dreschpe 0:a6545392ca42 31 FILE *fp = fopen(filename, "r");
dreschpe 0:a6545392ca42 32 if(fp == NULL) return (-1); // connot open file
dreschpe 0:a6545392ca42 33
dreschpe 0:a6545392ca42 34 // search for 0xFFC0 marker
dreschpe 0:a6545392ca42 35 fseek(fp, 0, SEEK_END);
dreschpe 0:a6545392ca42 36 unsigned int Fsize = ftell(fp);
dreschpe 0:a6545392ca42 37 fseek(fp, 2, SEEK_SET);
dreschpe 0:a6545392ca42 38 fread(data,4,1,fp);
dreschpe 0:a6545392ca42 39 marker = data[0] << 8 | data[1];
dreschpe 0:a6545392ca42 40 length = data[2] << 8 | data[3];
dreschpe 0:a6545392ca42 41 do {
dreschpe 0:a6545392ca42 42 if(marker == 0xFFC0) break;
dreschpe 0:a6545392ca42 43 if(marker & 0xFF00 != 0xFF00) break;
dreschpe 0:a6545392ca42 44 if (fseek(fp, length - 2,SEEK_CUR) != 0) break;
dreschpe 0:a6545392ca42 45 fread(data,4,1,fp);
dreschpe 0:a6545392ca42 46 marker = data[0] << 8 | data[1];
dreschpe 0:a6545392ca42 47 length = data[2] << 8 | data[3];
dreschpe 0:a6545392ca42 48 } while(1);
dreschpe 0:a6545392ca42 49 if(marker != 0xFFC0) return (-2); // no FFC0 Marker, wrong format no baseline DCT-based JPEG
dreschpe 0:a6545392ca42 50 fseek(fp, 1,SEEK_CUR);
dreschpe 0:a6545392ca42 51 fread(data,4,1,fp);
dreschpe 0:a6545392ca42 52 *y_size = (data[0] << 8 | data[1]);
dreschpe 0:a6545392ca42 53 *x_size = (data[2] << 8 | data[3]);
dreschpe 0:a6545392ca42 54
dreschpe 0:a6545392ca42 55 if(*x_size > TFT.FT_DispWidth || *y_size > TFT.FT_DispHeight) return (-3); // to big to fit on screen
dreschpe 0:a6545392ca42 56
dreschpe 0:a6545392ca42 57 fseek(fp, 0, SEEK_SET);
dreschpe 0:a6545392ca42 58 TFT.Ft_Gpu_Hal_WrCmd32(CMD_LOADIMAGE);
dreschpe 0:a6545392ca42 59 TFT.Ft_Gpu_Hal_WrCmd32(0);//destination address of jpg decode
dreschpe 0:a6545392ca42 60 TFT.Ft_Gpu_Hal_WrCmd32(0);//output format of the bitmap - default is rgb565
dreschpe 0:a6545392ca42 61 while(Fsize > 0) {
dreschpe 0:a6545392ca42 62 /* download the data into the command buffer by 8kb one shot */
dreschpe 0:a6545392ca42 63 blocklen = Fsize>8192?8192:Fsize;
dreschpe 0:a6545392ca42 64 /* copy the data into pbuff and then transfter it to command buffer */
dreschpe 0:a6545392ca42 65 fread(pbuff,1,blocklen,fp);
dreschpe 0:a6545392ca42 66 Fsize -= blocklen;
dreschpe 0:a6545392ca42 67 /* copy data continuously into command memory */
dreschpe 0:a6545392ca42 68 TFT.Ft_Gpu_Hal_WrCmdBuf(pbuff, blocklen); //alignment is already taken care by this api
dreschpe 0:a6545392ca42 69 }
dreschpe 0:a6545392ca42 70 fclose(fp);
dreschpe 0:a6545392ca42 71
dreschpe 0:a6545392ca42 72 return(0);
dreschpe 0:a6545392ca42 73 }
dreschpe 0:a6545392ca42 74
dreschpe 0:a6545392ca42 75 int main()
dreschpe 0:a6545392ca42 76 {
dreschpe 0:a6545392ca42 77 ft_int16_t x_size,y_size;
dreschpe 0:a6545392ca42 78 int err;
dreschpe 0:a6545392ca42 79
dreschpe 0:a6545392ca42 80 TFT.Ft_Gpu_CoCmd_Dlstart(); // start a new display command list
dreschpe 0:a6545392ca42 81 TFT.Ft_App_WrCoCmd_Buffer(CLEAR_COLOR_RGB(255,255,255)); // set the clear color to white
dreschpe 0:a6545392ca42 82 TFT.Ft_App_WrCoCmd_Buffer(CLEAR(1,1,1)); // clear buffers -> color buffer,stencil buffer, tag buffer
dreschpe 0:a6545392ca42 83 TFT.Ft_App_WrCoCmd_Buffer(COLOR_RGB(255,255,255)); // set current color
dreschpe 0:a6545392ca42 84
dreschpe 0:a6545392ca42 85
dreschpe 1:c603024cbd1d 86 err = load_jpg("/local/ARML2.jpg",& x_size,& y_size); // load graphic data into buffer and decode jpg to bitmap
dreschpe 1:c603024cbd1d 87 if(err != 0) { // something is wrong - display error
dreschpe 0:a6545392ca42 88 TFT.Ft_App_WrCoCmd_Buffer(COLOR_RGB(0,0,0)); // set current color
dreschpe 0:a6545392ca42 89 TFT.Ft_Gpu_CoCmd_Text((TFT.FT_DispWidth/2), TFT.FT_DispHeight/2, 25, OPT_CENTERX, "Error"); // draw Text with font 31
dreschpe 0:a6545392ca42 90 TFT.Ft_Gpu_CoCmd_Number(50,50,25,OPT_SIGNED,err);
dreschpe 0:a6545392ca42 91
dreschpe 1:c603024cbd1d 92 } else { // jpg is loaded and decoded into bitmap
dreschpe 0:a6545392ca42 93
dreschpe 0:a6545392ca42 94 TFT.Ft_App_WrCoCmd_Buffer(BEGIN(BITMAPS));
dreschpe 0:a6545392ca42 95 TFT.Ft_Gpu_CoCmd_LoadIdentity();
dreschpe 0:a6545392ca42 96 //TFT.Ft_Gpu_CoCmd_Rotate((45*65536/360));//rotate by 45 degrees anticlock wise
dreschpe 0:a6545392ca42 97 //TFT.Ft_Gpu_CoCmd_Scale(32768,32768);//scale by 2x2
dreschpe 0:a6545392ca42 98 TFT.Ft_Gpu_CoCmd_SetMatrix();
dreschpe 0:a6545392ca42 99 TFT.Ft_App_WrCoCmd_Buffer(VERTEX2F(0,0));
dreschpe 0:a6545392ca42 100
dreschpe 0:a6545392ca42 101 TFT.Ft_App_WrCoCmd_Buffer(DISPLAY()); // Display the image
dreschpe 0:a6545392ca42 102 TFT.Ft_Gpu_CoCmd_Swap(); // Swap the current display list
dreschpe 0:a6545392ca42 103
dreschpe 0:a6545392ca42 104 TFT.Ft_App_Flush_Co_Buffer(); // Download the commands into fifo
dreschpe 0:a6545392ca42 105 TFT.Ft_Gpu_Hal_WaitCmdfifo_empty(); // Wait till coprocessor completes the operation
dreschpe 0:a6545392ca42 106
dreschpe 0:a6545392ca42 107 wait(2);
dreschpe 0:a6545392ca42 108 TFT.Ft_Gpu_CoCmd_Dlstart();
dreschpe 0:a6545392ca42 109 TFT.Ft_App_WrCoCmd_Buffer(BEGIN(BITMAPS));
dreschpe 0:a6545392ca42 110 TFT.Ft_Gpu_CoCmd_LoadIdentity();
dreschpe 0:a6545392ca42 111 //TFT.Ft_Gpu_CoCmd_Scale(32768,32768);//scale by 0.5
dreschpe 0:a6545392ca42 112 //TFT.Ft_Gpu_CoCmd_Translate(50,50);
dreschpe 0:a6545392ca42 113 //TFT.Ft_Gpu_CoCmd_Rotate((45*65536/360));//rotate by 45 degrees anticlock wise
dreschpe 0:a6545392ca42 114 //TFT.Ft_Gpu_CoCmd_Scale(32768,32768);//scale by 2x2
dreschpe 0:a6545392ca42 115 TFT.Ft_Gpu_CoCmd_SetMatrix();
dreschpe 0:a6545392ca42 116 TFT.Ft_App_WrCoCmd_Buffer(VERTEX2F(50,50));
dreschpe 0:a6545392ca42 117 }
dreschpe 0:a6545392ca42 118 TFT.Ft_App_WrCoCmd_Buffer(DISPLAY()); // Display the image
dreschpe 0:a6545392ca42 119 TFT.Ft_Gpu_CoCmd_Swap(); // Swap the current display list
dreschpe 0:a6545392ca42 120
dreschpe 0:a6545392ca42 121 TFT.Ft_App_Flush_Co_Buffer(); // Download the commands into fifo
dreschpe 0:a6545392ca42 122 TFT.Ft_Gpu_Hal_WaitCmdfifo_empty(); // Wait till coprocessor completes the operation
dreschpe 0:a6545392ca42 123
dreschpe 0:a6545392ca42 124
dreschpe 0:a6545392ca42 125 }
dreschpe 0:a6545392ca42 126
dreschpe 0:a6545392ca42 127
dreschpe 0:a6545392ca42 128