Diff: main.cpp

Revision:

0:d2238a225cb8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jul 31 12:45:22 2020 +0000
@@ -0,0 +1,41 @@
+#include"mbed.h"                    // mbed header
+#include "C12832.h"                 // lcd header
+
+InterruptIn joystickcenter(p14);    // initialise interrupt pin on pcb
+InterruptIn button(p9);             // initialise external interrupt pin
+DigitalOut led(LED1);               // initialise interrupt led
+DigitalOut flash(LED4);             // initialise main program led
+C12832 lcd(p5, p7, p6, p8, p11);    // initialise lcd
+Timer debounce;                     // create debouce timer variable
+int state;                          // create interrupt activation variable
+int i=0;                            // create interrupt activation iterable variable
+
+void flip(){
+    debounce.start();               // start the timer
+    led=!led;                       // toggles the led when the joystick button is pressed.
+    state= 1;                       // changes global variable when interrupt activated
+    if (debounce.read_ms() >= 500){ // determine the timer limits - greater than or equal incase the exact count was missed by timer               
+        debounce.reset();           // reset the timer for the next use
+    }
+    
+}
+
+int main(){
+    joystickcenter.rise(&flip);     //attach the function address to the rising edge
+    button.mode(PullUp);            // With this, no external pullup resistor needed
+    button.rise(&flip);             // attach the function address to the rising edge
+    
+    while(1){                       //continuous run
+        if (state == 1){            // if interrupt activated
+            i++;                    // iterate the variable i
+            lcd.locate(0,0);        // home the lcd
+            lcd.printf("Interrupt Activated x %d", i);      // add lcd text
+            state = 0;              // reset the state variable from the interrupt
+            }
+        else                        // normal operation
+        {
+            flash=!flash;           // turns LED4 on ifoff, off if on
+            wait(0.25);             // the instruction to wait for a quarter-second
+        }
+    }
+}