Diff: main.cpp

Revision:

0:4e6cbb427cd7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 24 12:31:29 2015 +0000
@@ -0,0 +1,88 @@
+#include "mbed.h"
+
+//Global objects
+DigitalOut onboardLed(LED1);
+DigitalOut redLED(D7);
+DigitalOut yellowLED(D6);
+DigitalOut greenLED(D5);
+
+//Function prototypes (ISR)
+void doRedPWM();
+void doYellowPWM();
+void doGreenPWM();
+
+//One-shot timers
+Timeout tRed;
+Timeout tYellow;
+Timeout tGreen;
+
+//Interrupt Service Routine Flags
+volatile int redISRFlag = 0;
+volatile int yellowISRFlag = 0;
+volatile int greenISRFlag = 0;
+
+//ON and OFF times
+// RED 9:1
+float TRedON =  0.009;
+float TRedOFF = 0.001;
+// YELLOW 1:1
+float TYellowON =  0.001; 
+float TYellowOFF = 0.001;
+// GREEN 1:9 - nearly off
+float TGreenON =  0.001;
+float TGreenOFF = 0.009;
+
+int main() {
+    //Initialise the LEDs
+    redLED = 0;
+    yellowLED = 0;
+    greenLED = 0;
+
+    
+    //Initialise timers (oneshot)
+    tRed.attach(doRedPWM, TRedOFF);
+    tYellow.attach(doYellowPWM, TYellowOFF);
+    tGreen.attach(doGreenPWM, TGreenOFF);
+    
+    while (1) {
+        //Sleep and wait for an interrupt
+        sleep();
+        
+        //Chech which timer(s) went off
+        if (redISRFlag == 1) {
+            redISRFlag = 0; //Reset ISR flag
+            float t = (redLED==0) ? TRedOFF : TRedON;
+            tRed.attach(doRedPWM, t);  //Reset timer
+        }
+        if (yellowISRFlag == 1) {
+            yellowISRFlag = 0;
+            float t = (yellowLED==0) ? TYellowOFF : TYellowON;
+            tYellow.attach(doYellowPWM, t);  
+        }
+        if (greenISRFlag == 1) {
+            greenISRFlag = 0;
+            float t = (greenLED==0) ? TGreenOFF : TGreenON;
+            tGreen.attach(doGreenPWM, t);  
+        }                
+
+    }
+}
+
+void doRedPWM()
+{
+    //Toggle LED
+    redLED = !redLED;
+    //Flag that interrupt has fired
+    redISRFlag = 1;
+    
+}
+void doYellowPWM()
+{
+    yellowLED = !yellowLED;
+    yellowISRFlag = 1;
+}
+void doGreenPWM()
+{
+    greenLED = !greenLED;
+    greenISRFlag = 1; 
+}
\ No newline at end of file