Diff: main.cpp

Revision:

1:26267401354a

Parent:

0:4fbaafa6574c

Child:

2:c94244d1cab4

--- a/main.cpp	Wed Nov 12 18:56:57 2014 +0000
+++ b/main.cpp	Wed Nov 12 19:17:19 2014 +0000
@@ -9,24 +9,22 @@
 max31855 max1(thermoSPI, p20); //setup max31855 interface
 Mutex lcd_mutex; // mutex to make the lcd lib thread safe
 Semaphore four_slots(1); //Activate semaphore
-DigitalOut toggle(p30);
-DigitalIn up(p19);
-DigitalIn down(p18);
+DigitalOut toggle(p30); // toggle for Nichrome wire SSR
+DigitalIn up(p19); // User pushbutton up controller
+DigitalIn down(p18); // User pushbutton down button controller
 
-int settemp = 75;
-
+int settemp = 75; // initial temperature set
 float ftemperature = 0; // float variable for temperature
 float ctemperature = 0; // float variable for temperature
 
-// Thread t1
-//  print the elapsed time on line 1 of the uLCD (i.e., HH:MM:SS)
-void elapsedtime(void const *args) { //line 2
-    int s = 00;
-    int m = 00;
-    int h = 00;
+// Thread 1: print the elapsed time on line 1 of the uLCD (i.e., HH:MM:SS)
+void elapsedtime(void const *args) { //elapsed timer for when program starts
+    int s = 00; //seconds
+    int m = 00; //minutes 
+    int h = 00; //hours
     
     while(true){
-        s++;
+        s++; 
         if(s>59){
            s=00;
           m++;
@@ -35,24 +33,21 @@
            m=00;
            h++;
          }
-       four_slots.wait();
+       four_slots.wait(); // lock screen resource
        //lcd_mutex.lock();
-        uLCD.color(0xFFFF00);
-        uLCD.locate(0,0); //col,row
-        wait(0.1);
-        uLCD.printf("ET: %2d:%2d:%2d", h,m,s);
+        uLCD.color(0xFFFF00); //set text color
+        uLCD.locate(0,0); //col,row location of text
+        wait(0.1); 
+        uLCD.printf("ET: %2d:%2d:%2d", h,m,s); // display time
         //lcd_mutex.unlock();
-        four_slots.release();
+        four_slots.release(); //unlock screen resource
         Thread::wait(1000); // update once per secon
     }
 }
 
 
-// Thread t2
-//  print the temperature from the thermocouple - MAX31855 device
+// Thread 2: print the temperature from the thermocouple - MAX31855 device
 void thermoread(void const *args) { //line 2
-    
-
     while(true){
         if (max1.ready()==1){
             ctemperature = max1.read_temp(); //Get the reading
@@ -64,19 +59,13 @@
             uLCD.printf("Current Temp. F");
             uLCD.locate(0,3); //col,row
             uLCD.printf("%4.2f", ftemperature);
-            
-            //uLCD.locate(0,5); //col,row
-           // uLCD.printf("Set Temp. F");
-           // uLCD.locate(0,6); //col,row
-          //  uLCD.printf("%d",settemp);
-           
             four_slots.release(); 
         }
     }
 }
 
-
-void thermoset (void const *args) { //line 2
+// Thread 3: read in user input from buttons..
+void thermoset (void const *args) { //
     while(true){
         if (up==1){
             settemp += 1;
@@ -104,22 +93,20 @@
 }
 
 
-
 int main() {
     max1.initialise(); //initialize thermocouple IC    
     uLCD.baudrate(3000000); //set LCD baudrate
     Thread t1(elapsedtime); //run elapsed time counter
     Thread t2(thermoread); //read and display temperature from thermocouple
-    Thread t3(thermoset);
-    
+    Thread t3(thermoset); //runs thread that checks to see if user has changed the temperature setpoint
     
-    while(1){ //While so program doesn't end
-            if(ftemperature < settemp-1){
-                toggle=1; //turn on ssr
+    while(1){ //hystersis program
+            if(ftemperature < settemp-1){ //condition for 1 degree under
+                toggle=1; //turn on ssr for nichrome wire
             }
-            if(ftemperature > settemp+1){
-                toggle=0;
+            if(ftemperature > settemp+1){  //condition for 1 degree over
+                toggle=0; //turn off ssr for nichrome wire
             }
-            wait(1);
+            wait(1); //check every 1 second
         }
-}
\ No newline at end of file
+}