Diff: main.cpp

Revision:

0:48f4880c730b

Child:

1:3ed42298abc3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Apr 19 18:36:29 2013 +0000
@@ -0,0 +1,76 @@
+#include "mbed.h"
+#include "PinDetect.h"
+#include "TextLCD.h"
+// must import Cookbook PinDetct library into project
+// URL: http://mbed.org/users/AjK/libraries/PinDetect/lkyxpw
+ 
+DigitalOut myled(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+Timer t;
+TextLCD lcd(p36, p34, p9, p10, p15, p16); // rs, e, d0-d3
+ 
+PinDetect pb1(p18);
+PinDetect pb2(p19);
+// SPST Pushbutton debounced count demo using interrupts and callback
+// no external PullUp resistor needed
+// Pushbutton from P8 to GND.
+// Second Pushbutton from P7 to GND.
+// A pb hit generates an interrupt and activates the callback function
+// after the switch is debounced
+ 
+// Global count variable
+int volatile count=0;
+int volatile resetcnt=0;
+ 
+// Callback routine is interrupt activated by a debounced pb1 hit
+void pb1_hit_callback (void) {
+    count++;
+    myled4 = count & 0x01;
+    myled3 = (count & 0x02)>>1;
+    myled2 = (count & 0x04)>>2;
+    t.start();
+    if (resetcnt==1) {
+        t.reset();
+        resetcnt=0;
+       } 
+}
+// Callback routine is interrupt activated by a debounced pb2 hit
+void pb2_hit_callback (void) {
+    count--;
+    myled4 = count & 0x01;
+    myled3 = (count & 0x02)>>1;
+    myled2 = (count & 0x04)>>2;
+    t.stop();
+    resetcnt=resetcnt++;
+}
+int main() {
+ 
+    // Use internal pullups for pushbutton
+    //pb1.mode(PullUp);    
+    //pb2.mode(PullUp);
+    // Delay for initial pullup to take effect
+    //wait(.01);
+    // Setup Interrupt callback functions for a pb hit
+    pb1.attach_deasserted(&pb1_hit_callback);
+    pb2.attach_deasserted(&pb2_hit_callback);
+    // Start sampling pb inputs using interrupts
+    pb1.setSampleFrequency();
+    pb2.setSampleFrequency();
+    //Blink myled in main routine forever while responding to pb changes
+    // via interrupts that activate the callback counter function
+    while (1) {
+        myled = !myled;
+        
+                lcd.printf("Timer\n");
+                lcd.printf(" %4.2f sec\n", t.read());
+                
+                
+        wait(.01);
+        lcd.cls();
+        resetcnt=1;
+        
+    }
+ 
+}
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