Peter Drescher
Loading JPG to FT800 screen
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.
Revision 0:a6545392ca42, committed 2015-01-28
- Comitter:
- dreschpe
- Date:
- Wed Jan 28 23:36:29 2015 +0000
- Child:
- 1:c603024cbd1d
- Commit message:
- JPG load test
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/FT800.lib Wed Jan 28 23:36:29 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/dreschpe/code/FT800/#3c631ce6fbb5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Jan 28 23:36:29 2015 +0000
@@ -0,0 +1,129 @@
+/* Demo for mbed Library for FTDI FT800 Enbedded Video Engine "EVE"
+ * to show jpg file handling
+ * c by Peter Drescher, DC2PD 2014
+ * Released under the MIT License: http://mbed.org/license/mit */
+
+#include "mbed.h"
+#include "FT_Platform.h"
+
+Serial pc(USBTX, USBRX); // tx, rx
+DigitalOut myled(LED1);
+FT800 TFT(p11,p12,p13,p14,p15,p16); // the FT800 is connected to SPI 11-13
+
+LocalFileSystem local("local"); // filesystem to load jpg
+
+
+/* function to load jpg file from internal filesystem */
+/* return 0 if jpg is ok */
+/* return x_size and y_size of jpg */
+
+int load_jpg(char* filename, ft_int16_t* x_size, ft_int16_t* y_size)
+{
+ unsigned char pbuff[8291];
+ unsigned short marker;
+ unsigned short length;
+ unsigned char data[4];
+
+
+ ft_uint16_t blocklen;
+
+ FILE *fp = fopen(filename, "r");
+ if(fp == NULL) return (-1); // connot open file
+
+ // search for 0xFFC0 marker
+ fseek(fp, 0, SEEK_END);
+ unsigned int Fsize = ftell(fp);
+ fseek(fp, 2, SEEK_SET);
+ fread(data,4,1,fp);
+ marker = data[0] << 8 | data[1];
+ length = data[2] << 8 | data[3];
+ do {
+ if(marker == 0xFFC0) break;
+ if(marker & 0xFF00 != 0xFF00) break;
+ if (fseek(fp, length - 2,SEEK_CUR) != 0) break;
+ fread(data,4,1,fp);
+ marker = data[0] << 8 | data[1];
+ length = data[2] << 8 | data[3];
+ } while(1);
+ if(marker != 0xFFC0) return (-2); // no FFC0 Marker, wrong format no baseline DCT-based JPEG
+ fseek(fp, 1,SEEK_CUR);
+ fread(data,4,1,fp);
+ *y_size = (data[0] << 8 | data[1]);
+ *x_size = (data[2] << 8 | data[3]);
+
+ if(*x_size > TFT.FT_DispWidth || *y_size > TFT.FT_DispHeight) return (-3); // to big to fit on screen
+
+ fseek(fp, 0, SEEK_SET);
+ TFT.Ft_Gpu_Hal_WrCmd32(CMD_LOADIMAGE);
+ TFT.Ft_Gpu_Hal_WrCmd32(0);//destination address of jpg decode
+ TFT.Ft_Gpu_Hal_WrCmd32(0);//output format of the bitmap - default is rgb565
+ while(Fsize > 0) {
+ /* download the data into the command buffer by 8kb one shot */
+ blocklen = Fsize>8192?8192:Fsize;
+ /* copy the data into pbuff and then transfter it to command buffer */
+ fread(pbuff,1,blocklen,fp);
+ Fsize -= blocklen;
+ /* copy data continuously into command memory */
+ TFT.Ft_Gpu_Hal_WrCmdBuf(pbuff, blocklen); //alignment is already taken care by this api
+ }
+ fclose(fp);
+
+ return(0);
+}
+
+int main()
+{
+ ft_int16_t x_size,y_size;
+ int err;
+
+ TFT.Ft_Gpu_CoCmd_Dlstart(); // start a new display command list
+ TFT.Ft_App_WrCoCmd_Buffer(CLEAR_COLOR_RGB(255,255,255)); // set the clear color to white
+ TFT.Ft_App_WrCoCmd_Buffer(CLEAR(1,1,1)); // clear buffers -> color buffer,stencil buffer, tag buffer
+ TFT.Ft_App_WrCoCmd_Buffer(COLOR_RGB(255,255,255)); // set current color
+
+
+ err = load_jpg("/local/ARML2.jpg",& x_size,& y_size);
+ if(err != 0) {
+ TFT.Ft_App_WrCoCmd_Buffer(COLOR_RGB(0,0,0)); // set current color
+ TFT.Ft_Gpu_CoCmd_Text((TFT.FT_DispWidth/2), TFT.FT_DispHeight/2, 25, OPT_CENTERX, "Error"); // draw Text with font 31
+ TFT.Ft_Gpu_CoCmd_Number(50,50,25,OPT_SIGNED,err);
+
+ } else {
+
+ TFT.Ft_App_WrCoCmd_Buffer(BEGIN(BITMAPS));
+ TFT.Ft_Gpu_CoCmd_LoadIdentity();
+ //TFT.Ft_Gpu_CoCmd_Rotate((45*65536/360));//rotate by 45 degrees anticlock wise
+ //TFT.Ft_Gpu_CoCmd_Scale(32768,32768);//scale by 2x2
+ TFT.Ft_Gpu_CoCmd_SetMatrix();
+ TFT.Ft_App_WrCoCmd_Buffer(VERTEX2F(0,0));
+
+ TFT.Ft_App_WrCoCmd_Buffer(DISPLAY()); // Display the image
+ TFT.Ft_Gpu_CoCmd_Swap(); // Swap the current display list
+
+ TFT.Ft_App_Flush_Co_Buffer(); // Download the commands into fifo
+ TFT.Ft_Gpu_Hal_WaitCmdfifo_empty(); // Wait till coprocessor completes the operation
+
+ wait(2);
+ TFT.Ft_Gpu_CoCmd_Dlstart();
+ TFT.Ft_App_WrCoCmd_Buffer(BEGIN(BITMAPS));
+ TFT.Ft_Gpu_CoCmd_LoadIdentity();
+ //TFT.Ft_Gpu_CoCmd_Scale(32768,32768);//scale by 0.5
+ //TFT.Ft_Gpu_CoCmd_Translate(50,50);
+ //TFT.Ft_Gpu_CoCmd_Rotate((45*65536/360));//rotate by 45 degrees anticlock wise
+ //TFT.Ft_Gpu_CoCmd_Scale(32768,32768);//scale by 2x2
+ TFT.Ft_Gpu_CoCmd_SetMatrix();
+ TFT.Ft_App_WrCoCmd_Buffer(VERTEX2F(50,50));
+ }
+ TFT.Ft_App_WrCoCmd_Buffer(DISPLAY()); // Display the image
+ TFT.Ft_Gpu_CoCmd_Swap(); // Swap the current display list
+
+ TFT.Ft_App_Flush_Co_Buffer(); // Download the commands into fifo
+ TFT.Ft_Gpu_Hal_WaitCmdfifo_empty(); // Wait till coprocessor completes the operation
+
+
+
+
+}
+
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Jan 28 23:36:29 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/dc225afb6914 \ No newline at end of file