Diff: main.cpp

Revision:

1:699abdc72e3c

Parent:

0:448f8ee9d3f1

--- a/main.cpp	Fri Jan 22 19:21:11 2016 +0000
+++ b/main.cpp	Fri Jan 22 19:27:23 2016 +0000
@@ -42,14 +42,14 @@
 PinName dataBus[]= {p30, p29, p28, p27, p26, p25, p24, p23};
 ILI932x myLCD(BUS_8, dataBus, p15, p17, p16, p14, p20, "myLCD", 240, 320); // Bus 8 bit, bus pin array, CS, RST, DC, WR, RD, name, xpixels, ypixels
 DmTouch touch(DmTouch::DM_TFT24_104, p5, p6, p7, p8, p9);
-char orient=3;
-bool down, lastDown;
+char orient=3;              // orient horizontal is long axis
+bool down, lastDown;        // keeps track of whether or not the screen is/was pressed
 Timer t;
 DigitalOut led1(LED1);
 DigitalOut led2(LED2);
 DigitalOut led3(LED3);
 DigitalOut led4(LED4);
-uint16_t tx,ty;
+uint16_t tx,ty;         // coordinates for touch screen
 
 int main(){
     
@@ -75,36 +75,36 @@
     
     // Touch screen demo
 
-        touch.setOrientation(orient);
+        touch.setOrientation(orient);       // orient LCD screen
         down = false;
         bool justDown = false;
 
-        t.reset();
+        t.reset();                          // reset timer
         while (1) {
             
-            touch.readTouchData(tx, ty, down);
+            touch.readTouchData(tx, ty, down);          // read if touch screen is pressed and where
             if (down){
-                if(t.read_ms()>200){
-                    if ((110>tx) && (tx>50) && (90>ty) && (ty>30)) //toggle LED 1
-                        led1 = !led1;
-                    if ((270>tx) && (tx>210) && (90>ty) && (ty>30)) //toggle LED 2
-                        led2 = !led2;
-                    if ((110>tx) && (tx>50) && (210>ty) && (ty>150)) //toggle LED 3
-                        led3 = !led3;
-                    if ((270>tx) && (tx>210) && (210>ty) && (ty>150)) //toggle LED 4
-                        led4 = !led4;
+                if(t.read_ms()>200){                    // "debounce
+                    if ((110>tx) && (tx>50) && (90>ty) && (ty>30))  // if touch screen is pressed in circle 1
+                        led1 = !led1;                               //toggle LED 1
+                    if ((270>tx) && (tx>210) && (90>ty) && (ty>30)) // if touch screen is pressed in circle 2
+                        led2 = !led2;                               //toggle LED 2
+                    if ((110>tx) && (tx>50) && (210>ty) && (ty>150)) // if touch screen is pressed in circle 3
+                        led3 = !led3;                               //toggle LED 3
+                    if ((270>tx) && (tx>210) && (210>ty) && (ty>150)) // if touch screen is pressed in circle 4
+                        led4 = !led4;                               //toggle LED 4
                     
-                t.reset();
+                t.reset();                              // reset timer
                 wait(0.04);
                 
                 }   
-                else if (justDown) {
+                else if (justDown) {                        // if it was just pressed but is no longer pressed
                     
-                // no longer pressed, clean text
+                // necessary to prevent leds from blinking
                 myLCD.locate(40, 20);
                 myLCD.printf("     ");
                 }
-                justDown = down;
+                justDown = down;                
             }
         }