File content as of revision 1:1286125a89ba:

/* Program: Bootcamp-HelloWorld_LED_Count.cpp
 * Author: Max Amani
 * Description:This program uses the LCP1768 Microcontroller 4 LEDs to count up from 0 to 15 and reset to 0
 * When a pin connected to the LED is high, the LED lights up
 */
#include "mbed.h"

#define MAX_COUNT 16

BusOut busLeds (LED4,LED3,LED2,LED1);

//PROTOTYPES
void delay(void);
void displayCount(const unsigned char hex);

int main() {

    int i;
    while(1) {
        
        for ( i = 0 ; i < MAX_COUNT ; i++ )
        {   
            
            switch (i){
                case 0: busLeds = ~0xF;
                        displayCount(0x0);
                        delay();
                        break;
                case 1: busLeds = 0x1;
                        displayCount(0x1);
                        delay();
                        break;
                case 2: busLeds = 0x2; 
                        displayCount(0x2);
                        delay();
                        break;
                case 3: busLeds = 0x3;
                        displayCount(0x3);
                        delay();
                         break;
                case 4: busLeds = 0x4;
                        displayCount(0x4);
                        delay();
                        break;
                case 5: busLeds = 0x5;
                        displayCount(0x5);
                        delay();
                        break;
                case 6: busLeds = 0x6;
                        displayCount(0x6);
                        delay();
                        break;
                case 7: busLeds = 0x7; 
                        displayCount(0x7);
                        delay();
                        break;
                case 8: busLeds = 0x8; 
                        displayCount(0x8);
                        delay();
                        break;
                case 9: busLeds = 0x9; 
                        displayCount(0x9);
                        delay();
                        break;
                case 10: busLeds = 0xA; 
                         displayCount(0xA);
                         delay();
                         break;
                case 11: busLeds = 0xB; 
                         displayCount(0xB);
                         delay();
                         break;
                case 12: busLeds = 0xC; 
                         displayCount(0xC);
                         delay();
                         break;
                case 13: busLeds = 0xD; 
                         displayCount(0xD);
                         delay();
                         break;
                case 14: busLeds = 0xE; 
                         displayCount(0xE);
                         delay();
                         break;
                case 15: busLeds = 0xF; 
                         displayCount(0xF);
                         delay();
                         break;            
             }
        }
     }
}
// delay function 
void delay(){
    wait(1.0);
}
//Function that convert a hex number into a binary and append 'b' at the end
void displayCount(const unsigned char hex){
   
    unsigned char i , c = hex;          // hex value to convert in binary
    unsigned char Mask = 1 << 3;        // Mask value is set to 8 = 2^(n-1) = 1<< 3 . 
                                        // Number of bits in the binary value
    for ( i = 1 ; i <= 4 ; i++ )
    {
        putchar(c & Mask ? '1' : '0');  
        c <<= 1;
    }
  putchar('b');
  putchar('\n');
}