A simple program to be used to calibrate the TouchScreen library

Dependencies:   TouchScreen UniGraphic mbed-rtos mbed

Files at this revision

API Documentation at this revision

Comitter:
duncanFrance
Date:
Sat Mar 19 15:42:31 2016 +0000
Commit message:
Initial import

Changed in this revision

TouchScreen.lib Show annotated file Show diff for this revision Revisions of this file
UniGraphic.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-rtos.lib Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r 0df0b8e0dc55 TouchScreen.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TouchScreen.lib	Sat Mar 19 15:42:31 2016 +0000
@@ -0,0 +1,1 @@
+https://developer.mbed.org/users/duncanFrance/code/TouchScreen/#3f0160100cc9
diff -r 000000000000 -r 0df0b8e0dc55 UniGraphic.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/UniGraphic.lib	Sat Mar 19 15:42:31 2016 +0000
@@ -0,0 +1,1 @@
+https://developer.mbed.org/users/duncanFrance/code/UniGraphic/#4d15eb940be7
diff -r 000000000000 -r 0df0b8e0dc55 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Mar 19 15:42:31 2016 +0000
@@ -0,0 +1,136 @@
+#include "mbed.h"
+#include "rtos.h"
+
+#include "Arial12x12.h"
+#include "Arial24x23.h"
+#include "ILI932x.h"
+#include "TouchScreen.h"
+
+
+#define LCD_X_RES 240
+#define LCD_Y_RES 320
+
+#define LCD_CS PH_0
+#define LCD_RESET PH_1
+#define LCD_RS PA_0
+#define LCD_WR PA_1
+#define LCD_RD PA_4
+
+
+#define T_CLK  PC_10
+#define T_DIN  PC_12
+#define T_DOUT PC_11
+#define T_CS   PC_8
+#define T_IRQ  PB_9
+
+/**
+* My touch screen lies at a slight angle and hides some of the screen   
+* Adjust this value as needed until the calibration dots are visible on your screen
+**/
+#define CAL_OFFSET 4
+
+/**
+* hand-crafted values for the touch-screen calibration
+**/
+#define TOUCH_X_MIN 540
+#define TOUCH_X_MAX 3700
+#define TOUCH_Y_MIN 340
+#define TOUCH_Y_MAX 3656
+
+unsigned short backgroundcolor=Black;
+unsigned short foregroundcolor=White;
+
+ILI932x* mySCREEN;
+TouchScreen* touchScreen;
+Serial *pc;
+
+volatile bool done;
+volatile int xt, yt;
+volatile int xmin = 9999;
+volatile int xmax = 0;
+volatile int ymin = 9999;
+volatile int ymax = 0;
+    
+
+void touchStart(TouchPosition p) {
+    mySCREEN->fillcircle(p.screenX, p.screenY, 10, Blue) ;
+}
+    
+void touchMove(TouchPosition p) {
+    mySCREEN->fillcircle(p.screenX+10, p.screenY, 10, Green) ;
+}
+    
+void touchEnd(TouchPosition p) {
+    mySCREEN->fillcircle(p.screenX+20, p.screenY, 10, Red) ;
+    done = true;
+    xt = p.x;
+    yt = p.y;
+}
+
+void cal(int x, int y) {
+    done = false;
+    mySCREEN->fillcircle(x, y, 4, Red) ;
+    while(!done) {
+        // wait
+    }
+    pc->printf("X=%d, Y=%d\r\n", xt, yt);
+    if(xmin>xt) xmin=xt;
+    if(xmax<xt) xmax=xt;
+    if(ymin>yt) ymin=yt;
+    if(ymax<yt) ymax=yt;
+}
+
+void print_calibration() {
+    // We have max and min values corresponding to points inside the screen area
+    // Work out the scaling factor on each axis, and adjust the origin to account for the 
+    // offset used during calibration
+    float xscale, yscale;
+    int axmin, axmax, aymin, aymax;
+    xscale = (xmax - xmin) / (LCD_X_RES - 2*CAL_OFFSET);
+    axmin = xmin - CAL_OFFSET * xscale;
+    axmax = xmax + CAL_OFFSET * xscale;
+
+    yscale = (ymax - ymin) / (LCD_Y_RES - 2*CAL_OFFSET);
+    aymin = ymin - CAL_OFFSET * yscale;
+    aymax = ymax + CAL_OFFSET * yscale;
+
+    pc->printf("#define TOUCH_X_MIN %u\r\n", axmin);
+    pc->printf("#define TOUCH_X_MAX %u\r\n", axmax);
+    pc->printf("#define TOUCH_Y_MIN %u\r\n", aymin);
+    pc->printf("#define TOUCH_Y_MAX %u\r\n", aymax);
+}
+
+int main()
+{
+    pc = new Serial(USBTX, USBRX);
+    pc->baud (9600);
+    pc->printf("\n\nSystem Core Clock = %.3f MHZ\r\n",(float)SystemCoreClock/1000000);
+
+    mySCREEN = new ILI932x(PAR_8, PortC, LCD_CS, LCD_RESET, LCD_RS, LCD_WR, LCD_RD,"myLCD");
+
+    pc->printf("Screen id %d\r\n", mySCREEN->tftID);
+
+    mySCREEN->set_orientation(0);
+    mySCREEN->cls();                // clear the screen
+    mySCREEN->locate(0,0);
+    mySCREEN->background(backgroundcolor);    // set background to black
+    mySCREEN->foreground(foregroundcolor);    // set chars to white
+    mySCREEN->set_font((unsigned char*) Arial24x23);
+
+    touchScreen = new TouchScreen(T_DIN, T_DOUT, T_CLK, T_CS, T_IRQ);
+    touchScreen->setTouchStartHandler(&touchStart);
+    touchScreen->setTouchMoveHandler(&touchMove);
+    touchScreen->setTouchEndHandler(&touchEnd);
+    touchScreen->setLCDGeometry(LCD_X_RES, LCD_Y_RES, TOUCHSCREEN_ORIENTATION_PORTRAIT | TOUCHSCREEN_ORIENTATION_ROTATED);
+    touchScreen->setCalibration(TOUCH_X_MIN, TOUCH_X_MAX, TOUCH_Y_MIN, TOUCH_Y_MAX);
+    
+    while (1) {
+        pc->printf("Calibrate..\r\n");
+        cal(CAL_OFFSET, CAL_OFFSET);
+        cal(LCD_X_RES-CAL_OFFSET, CAL_OFFSET);
+        cal(CAL_OFFSET, LCD_Y_RES-CAL_OFFSET);
+        cal(LCD_X_RES-CAL_OFFSET, LCD_Y_RES-CAL_OFFSET);
+        print_calibration();
+        Thread::wait(1000);
+    }
+}
diff -r 000000000000 -r 0df0b8e0dc55 mbed-rtos.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-rtos.lib	Sat Mar 19 15:42:31 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed-rtos/#bdd541595fc5
diff -r 000000000000 -r 0df0b8e0dc55 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Mar 19 15:42:31 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/c0f6e94411f5
\ No newline at end of file