Revision 0:7eacf3f1a1be, committed 2020-11-24

Comitter:

kwstasfane1

Date:

Tue Nov 24 15:25:42 2020 +0000

Commit message:

Solution for workshop 3(interrupt). Enhanced timer is implemented that shows up to 9 lap times that reset with the push of reset button. Also, the stopwatch is reset/started again by pressing the reset button. Lap times are not scrolled;

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/enhanced_timer.cpp	Tue Nov 24 15:25:42 2020 +0000
@@ -0,0 +1,164 @@
+#include "mbed.h"
+#include "C12832.h" 
+
+// LCD display
+C12832 lcd(p5, p7, p6, p8, p11);
+
+//Joystick
+//DigitalIn joyU(p13); // joystick 'DOWN' resets the stopwatch
+//DigitalIn joyC(p14); // joystick 'PUSH' starts and stops it
+
+
+InterruptIn joyD(p12); // joystick 'DOWN' resets the stopwatch
+InterruptIn joyC(p14); // joystick 'PUSH' starts and stops it
+InterruptIn joyU(p13); // joystick 'UP' toggle the display
+
+void joyC_isr();
+void joyD_isr();
+void joyU_isr();
+bool joyUflag = 0;
+bool joyCflag = 0;
+bool joyDflag = 0;
+
+float saved_lap_times [8] = {0.0};
+int i= 0;
+
+int main() 
+{
+    float t = 0.0; // the timer a floating point counter
+    bool run = 1; // the state of the stopwatch run stopped
+    
+    //At startup just print a few things on the lcd and then enter a loop until the user does something
+    lcd.cls(); //clear screen
+    lcd.locate(1,20);
+    lcd.printf("ready push joystick to start");//ready to go
+    lcd.locate(10,10);
+    lcd.printf("Stopwatch time %4.1f",t);//display time on the stopwatch
+    
+    joyC.rise(&joyC_isr);
+    joyD.rise(&joyD_isr);
+    joyU.rise(&joyU_isr);
+    
+    while(1) 
+    {
+        //reset timer if the joystick is pressed 'DOWN'
+        
+        if (joyDflag)
+        {
+            t = 0; // clear the timer
+            run = !run; // and stop further operation
+            lcd.cls(); //clear screen
+            lcd.locate(40,20);
+            lcd.printf("reset");//tell the user
+            lcd.locate(10,10);
+            lcd.printf("Stopwatch time %4.1f",t);//display time on the stopwatch
+            for(int j=0; j<=8; j++)
+            {
+                saved_lap_times[j] = 0.0;
+            }
+            i=0;
+        }
+        
+        /*this is the bit that decides if the stopwatch is running
+        i.e. run == 1, if so then increment the timer and print its value
+        otherwise just wait*/
+        
+        //if (joyCflag)
+        if(run == 1)
+        {
+            t =t + 0.1;
+            
+            if(!joyUflag)
+            {
+                wait(0.1);
+                lcd.cls(); //clear screen
+                lcd.locate(10,10);
+                lcd.printf("Stopwatch time %4.1f",t);//display time
+            }
+            else
+            {
+                wait(0.01);
+                lcd.cls(); //clear screen
+                lcd.locate(1,1);
+                lcd.printf("L1:");//display time
+                lcd.locate(13,1);
+                lcd.printf("%3.1f",saved_lap_times [0]);
+                lcd.locate(42,1);
+                lcd.printf("L2:");//display 
+                lcd.locate(54,1);
+                lcd.printf("%3.1f",saved_lap_times [1]);
+                lcd.locate(82,1);
+                lcd.printf("L3:");//display time
+                lcd.locate(95,1);
+                lcd.printf("%3.1f",saved_lap_times [2]);
+                lcd.locate(1,11);
+                lcd.printf("L4:");//display time
+                lcd.locate(13,11);
+                lcd.printf("%3.1f",saved_lap_times [3]);
+                lcd.locate(42,11);
+                lcd.printf("L5:");//display 
+                lcd.locate(54,11);
+                lcd.printf("%3.1f",saved_lap_times [4]);
+                lcd.locate(82,11);
+                lcd.printf("L6:");//display time
+                lcd.locate(95,11);
+                lcd.printf("%3.1f",saved_lap_times [5]);
+                lcd.locate(1,22);
+                lcd.printf("L7:");//display time
+                lcd.locate(13,22);
+                lcd.printf("%3.1f",saved_lap_times [6]);
+                lcd.locate(42,22);
+                lcd.printf("L8:");//display 
+                lcd.locate(54,22);
+                lcd.printf("%3.1f",saved_lap_times [7]);
+                lcd.locate(82,22);
+                lcd.printf("L9:");//display time
+                lcd.locate(95,22);
+                lcd.printf("%3.1f",saved_lap_times [8]);
+            }
+        }
+        
+        //use it to save the current time with the push of centre button
+        if(joyCflag)
+        {
+            joyCflag=0;
+            
+            if(i<=8)
+            {
+                saved_lap_times[i]=t;
+                i++;
+            }
+        }
+        
+        //toggle the display
+        
+        /* this bit toggles the run control between the run / stopped states
+         when the joystick is pushed 'IN' */
+         
+        //if (run == 1)
+       // {
+            //if (!joyCflag)
+            //{ // was running so stop it
+                //run = 0;
+                //lcd.locate(40,20);
+               //lcd.printf("stopped");//timer has stopped
+            //}
+        //}
+    }
+}
+
+void joyC_isr() 
+{
+ joyCflag = !joyCflag;
+}
+
+void joyD_isr()
+{
+    joyDflag = !joyDflag;
+    joyCflag = 0;
+}
+
+void joyU_isr() 
+{
+ joyUflag = !joyUflag;
+}