#include  <msp430x43x.h>

void	DisplayValue(int Value);

//unsigned int TempValue = 1;  // number to display, range = 0 - 1999 = max display
                            // NOTE: DO NOT use leading zeros
unsigned int h;
unsigned int i;
unsigned int dig_pntr;  
static unsigned int Voltage; 
//static unsigned long int TempValue;

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop watchdog timer
  FLL_CTL0 |= XCAP14PF;                 // Configure load caps
  IE2 |= BTIE;                          // Enable BasicTimer interrupt
  BTCTL = BT_ADLY_125;					//Interrupt 125ms from header file <msp430x43x.h>
  //BTCTL = BT_ADLY_1000;					//Interrupt 1000ms from header file <msp430x43x.h>

  // initialize LCD driver (static mode) //
  // Setup LCD
  LCDCTL = 0xE5;

  P5DIR |= 0x02;                        // Set P5.1 to output direction
  P1DIR |= 0x01;                        // Set P1.0 to output direction

  // Setup port functions
  P2SEL = 0xFF;
  P3SEL = 0xFF;
  P4SEL = 0xFF;
  P5SEL = 0xFF;

  
	//A/D conversion
  P6SEL = 0x00; 
  P6SEL |= 0x80;                        // Enable A/D channel A7
  ADC12CTL0 = ADC12ON+SHT0_2+REFON+REF2_5V ;  // Turn on and set up ADC12
  ADC12CTL1 = SHP;                      // Use sampling timer
  ADC12MCTL0 = SREF_1 +INCH_7;                  // Vr+=Vref+ADCChannel7


  for ( i=0; i<0x3600; i++)              // Delay for reference start-up
  {
  }

  _EINT();                              // Enable interrupts
  ADC12CTL0 |= ENC;                     // Enable conversions

  //main loop
  while(1)
  {
     _BIS_SR(LPM0_bits);                 // Enter LPM3 low power mode 0
  }
}


// Basic Timer interrupt service routine
interrupt[BASICTIMER_VECTOR] void basic_timer(void)
{
    _BIC_SR_IRQ(LPM0_bits);             // Clear LPM0 bits from 0(SR)
	P1OUT ^= 0x01;                      // Toggle P1.0 using exclusive-OR
	P5OUT ^= 0x02;                        // Toggle P5.1

	ADC12CTL0 |= ADC12SC;               // Start conversion
    while ((ADC12IFG & BIT0)==0);
    _NOP();  // SET BREAKPOINT HERE

	DisplayValue(ADC12MEM0);
}

void	DisplayValue(int Value)
{

char *LCD = LCDMEM;

  // array declaration //
  char digit[40] =
  {
	0x11, 0x11,  // "0"    LCD segments a+b & c+d = lower two bytes
	0x11, 0x00,  // "0"    LCD segments e+f & g+h = upper two bytes
	0x10, 0x01,  // "1" 
	0x00, 0x00,  // "1" 
	0x11, 0x10,  // "2" 
	0x01, 0x01,  // "2" 
	0x11, 0x11,  // "3" 
	0x00, 0x01,  // "3" 
	0x10, 0x01,  // "4" 
	0x10, 0x01,  // "4" 
	0x01, 0x11,  // "5"  
	0x10, 0x01,  // "5"  
	0x01, 0x11,  // "6" 
	0x11, 0x01,  // "6" 
	0x11, 0x01,  // "7" 
	0x00, 0x00,  // "7" 
	0x11, 0x11,  // "8" 
	0x11, 0x01,  // "8" 
	0x11, 0x11,  // "9" 
	0x10, 0x01,  // "9" 
  };
  
	// clear LCD memory to clear display //
  for (i=0; i<20; i++)
  {
    LCD[i] = 0;
  } 
  
  //Calculate Voltage
  //Value =(2500*Value)/4095;
  Voltage = (int)(((long)Value*250)/4095);
  

  // display higher 4-th digit (nothing or 1) //
  if(Voltage <= 1999)
  {
	  
	  if (Voltage >= 1000)
	  {
		LCDM15 = 0x001;             // set bit = leading 1
	  }

	  // display lower 3 digits //
	  for (h=0; h<=2; h++)           // loops to move 3 digits to LCD
	  {
		dig_pntr = 4*(Voltage%10);    // set pointer to start of digit in table


		for (i=0; i<4; i++)         // loops to load 4 bytes of digit
		{
		  LCD[i] = digit[dig_pntr++]; // byte of digit to byte of LCD memory 
		}                           // and increment to next byte of digit
  
		Voltage = Voltage/10;                // shifts value right to display next character
		if(h==0)
		{
			LCD = LCD + 4;          // increment by 4 for next character location
		}
		   if(h==1)
		{
			LCD = LCD + 6;			// increment by 10 for next character location
		}
	  }
	  LCDM14 |= 0x010;             // set bit = decimal point
  }
  else
  {
	  //need added ERROR Message
  }
}