Diff: FT_Hal_Utils.cpp

Revision:

0:352efe1d072f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FT_Hal_Utils.cpp	Mon Mar 11 19:14:19 2019 +0000
@@ -0,0 +1,83 @@
+#include "FT_Platform.h"
+#include "mbed.h"
+
+/* function to load jpg file from filesystem */
+/* return 0 if jpg is ok                     */
+/* return x_size and y_size of jpg           */
+
+int FT800::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 > DispWidth || *y_size > DispHeight) return (-3);  // to big to fit on screen
+
+    fseek(fp, 0, SEEK_SET);
+    WrCmd32(CMD_LOADIMAGE);  // load a JPEG image
+    WrCmd32(0);              //destination address of jpg decode
+    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 */
+        WrCmdBuf(pbuff, blocklen); //alignment is already taken care by this api
+    }
+    fclose(fp);
+
+    return(0);
+}
+
+
+/* calibrate touch */
+ft_void_t FT800::Calibrate()
+{
+    /*************************************************************************/
+    /* Below code demonstrates the usage of calibrate function. Calibrate    */
+    /* function will wait untill user presses all the three dots. Only way to*/
+    /* come out of this api is to reset the coprocessor bit.                 */
+    /*************************************************************************/
+    {
+
+        DLstart();                                       // start a new display command list
+        DL(CLEAR_COLOR_RGB(64,64,64));       // set the clear color R, G, B
+        DL(CLEAR(1,1,1));                    // clear buffers -> color buffer,stencil buffer, tag buffer
+        DL(COLOR_RGB(0xff,0xff,0xff));       // set the current color R, G, B
+        Text((DispWidth/2), (DispHeight/2), 27, OPT_CENTER, "Appuyez sur les points");  // draw Text at x,y, font 27, centered
+        Calibrate(0);                                    // start the calibration of touch screen
+        Flush_Co_Buffer();                               // download the commands into FT800 FIFO
+        WaitCmdfifo_empty();                             // Wait till coprocessor completes the operation
+    }
+}
+
+