main.cpp

00001 #include "mbed.h"
00002 
00003 BusOut LED_Disp(p7,p11,p9,p8,p5,p6,p10,p12);
00004 
00005 InterruptIn button_up(p14);             //assign interrupt to 14 and 15
00006 InterruptIn button_down(p17);
00007 
00008 int counter1;                 //global counter value
00009 
00010 void Increment_up(void);        //ISR to be assigned to button_up interrupt
00011 void Increment_down(void);      
00012 void DisplayNumber(int);        //function to display number on seven segment
00013 
00014 int main()
00015 {
00016     button_up.rise(&Increment_up);     //attach adress of ISR to interrupt
00017     button_down.rise(&Increment_down);
00018     
00019     while(1)
00020     {
00021         wait(0.2);
00022     }
00023 }
00024 
00025 // Interrupt function to increment counter
00026 void Increment_up(void)
00027 {
00028     counter1++;    //increment counter
00029     
00030     if(counter1 <0)   // check for min value
00031         counter1 = 0;
00032         
00033     if(counter1 >9)    //check for max value
00034         counter1 = 9;
00035         
00036     DisplayNumber(counter1);        //display counter1 number on seven segment
00037     wait(0.3);                         //debounce timer
00038     
00039 }
00040 
00041 void Increment_down(void)
00042 {
00043     counter1--;
00044     if(counter1 <0)   
00045         counter1 = 0;
00046         
00047     if(counter1 >9)    
00048         counter1 = 9;
00049         
00050     DisplayNumber(counter1);        
00051     wait(0.3); 
00052 }
00053 
00054 //funtion to display counter1 on seven segment
00055 void DisplayNumber(int num)
00056 {
00057     switch(num)
00058     {
00059         case 0:
00060             LED_Disp = ~0x3F;
00061             break;
00062         case 1:
00063             LED_Disp = ~0x06;
00064             break;
00065         case 2:
00066             LED_Disp = ~0x5B;
00067             break;
00068         case 3:
00069             LED_Disp = ~0x4F;
00070             break;
00071         case 4:
00072             LED_Disp = ~0x66;
00073             break;
00074         case 5:
00075             LED_Disp = ~0x6D;
00076             break;
00077         case 6:
00078             LED_Disp = ~0x7D;
00079             break; 
00080         case 7:
00081             LED_Disp = ~0x07;
00082             break;
00083         case 8:
00084             LED_Disp = ~0x7F;
00085             break;
00086         case 9:
00087             LED_Disp = ~0x67;
00088             break; 
00089     }
00090 }
00091          
00092                         
00093     
00094     
00095