#include <msp430.h>
#include "lcd.h"
void delay(int);
void configWDT();
void configIO();
void configIR();
void configT();
void disableT();
void int_char();

int i=0;
int j=0;
char str[4];

int main(void)
{

	configWDT();

	configIO();

	configIR();

	InitializeLcm();

	ClearLcmScreen();

	PrintStr("Put your Finger");
	LcmSetCursorPosition(2,0);
	PrintStr("on the sensor :");

	while(1)
  {
	  delay(10);
	  //P1OUT |= BIT6;
  }

}

void configWDT()
  {
	  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  }

void configIO()
{
	P1OUT=0x00;

	P1DIR |= (BIT0 + BIT6);							// P1.0 output
}

void configIR()
{
	  P1REN |= BIT3; // P2 Enable Pullup/Pulldown
	  P1OUT |= BIT3; // P2 pullup
	  P1IE |= BIT3; // P2 interrupt enabled
	  P1IES |= BIT3; // P2 Hi/lo falling edge
	  P1IFG &= ~(BIT3); // P2 IFG cleared just in case
	  _EINT();
}

void enablePulseIR()
{
	  P2REN |= BIT1; // P2 Enable Pullup/Pulldown
	  P2OUT |= BIT1; // P2 pullup
	  P2IE |= BIT1; // P2 interrupt enabled
	  P2IES |= BIT1; // P2 Hi/lo falling edge
	  P2IFG &= ~(BIT1); // P2 IFG cleared just in case
//	  _EINT();

}

void disablePulseIR()
{
	  P2REN &= ~BIT1; // P2 Enable Pullup/Pulldown
	  P2OUT &= ~BIT1; // P2 pullup
	  P2IE &= ~BIT1; // P2 interrupt enabled
	  P2IES &= ~BIT1; // P2 Hi/lo falling edge
	  P2IFG |= (BIT1); // P2 IFG cleared just in case

}

void configT()
{
	CCTL0 = CCIE;                             // CCR0 interrupt enabled
	CCR0 = 50000;
	TACTL = TASSEL_2 + MC_1;                  // SMCLK, upmode
}

void disableT()
{
	  TACTL = 0X00;
}

void delay(int a)
{
   	for(;a>0;a++)
   	_delay_cycles(7);
}

void printResult()
{
	int_char();
	ClearLcmScreen();
	PrintStr("HeartBeat/min :");
	LcmSetCursorPosition(2,0);
	PrintStr(str);
}

#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
	if(i<350) i++;
	else
	{
		P1OUT &= (~BIT0);                            // Toggle P1.0
		disableT();
		configIR();
		disablePulseIR();
		j=j*4;
		printResult();
		i=0;
		j=0;
	}
}

#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
	if((P1IFG & 0x08) == 0x08)
	{
		P1OUT |= BIT0;
		configT();
		enablePulseIR();
		P1IFG &= ~BIT3;
		ClearLcmScreen();
		PrintStr("Please wait :");

	}
}
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
{
			P2IE &= ~BIT1;
			j++;
			P2IE |= BIT1;
			P2IFG &= ~BIT1;
}

void int_char()
{
	int s;
	s=j%10;
	str[2]=(char)(s+48);
	j=j/10;
	s=j%10;
	str[1]=(char)(s+48);
	j=j/10;
	s=j%10;
	str[0]=(char)(s+48);
	str[3]='\0';
}