Compiler/MSP430G2553: Heart Beat Counter using Analog Sensor: Cannot read values.

Tool/software: TI C/C++ Compiler

Greetings! I'm working on a project about calculating beats per minute with MSP430G2553 using a pulse sensor. I've searched and found some resorces and firstly I'm trying to apply them. Later, I will improve my project. I am quite new on these microprocessors, so I'm waiting for your kind help.

(I don't know if can share a link but if I cannot, please edit my post.)

Related link for the project: www.instructables.com/.../

Pulse sensor: http://www.instructables.com/id/Heart-Beat-Counter-using-MSP430/

LCD Library: http://www.ece.utep.edu/courses/web3376/Lab_5_-_LCD_files/lcdLib.h

LCD C file: www.ece.utep.edu/.../lcdLib.c

At first, I've just tried to perform the project in this schematic with a pulse sensor. I just plugged my sensor's +VCC pin to a +5V source and GND pin to the ground then the OUTPUT pin to ninth pin of MSP430G2553. (P2.1)

Everything was OK but there should have been some problems about wiring LCD; I couldn't operate the LCD. So, I've decided to try another library for LCD. With this new library, my LCD just works fine. But there's another problem now. I cannot read any -true- values! (The value is always 8 or 12.)

Later, I've detected the problem here: LCD uses P2.1 for writing the DATA from pulse sensor. And pulse sensor is sending it's pulses to P2.1. I've decided to move my input pin from P2.1 to P2.6 but it just didn't work.

There's some issue but I cannot figure it out. Can you please help me? 

My code is below:

=========

main.c

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

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

int main(void)
{

configWDT();

configIO();

configIR();

lcdInit();

lcdClear();

lcdSetText("Put your Finger", 0, 0);
lcdSetText("on the sensor :", 0, 1);

while(1)
{

}

}

void configWDT()
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
/*DCOCTL = 0;
DCOCTL = CALDCO_1MHZ;
BCSCTL1 = CALBC1_1MHZ;
*/}

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 |= BIT6; // P2 Enable Pullup/Pulldown
P2OUT |= BIT6; // P2 pullup
P2IE |= BIT6; // P2 interrupt enabled
P2IES |= BIT6; // P2 Hi/lo falling edge
P2IFG &= ~(BIT6); // P2 IFG cleared just in case

}

void disablePulseIR()
{
P2REN &= ~BIT6; // P2 Enable Pullup/Pulldown
P2OUT &= ~BIT6; // P2 pullup
P2IE &= ~BIT6; // P2 interrupt enabled
P2IES &= ~BIT6; // P2 Hi/lo falling edge
P2IFG |= (BIT6); // 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 printResult()
{
int_char();
lcdClear();
lcdSetText("HeartBeat/min :",0,0);
lcdSetText(lcdstr,0,1);
}

#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;
lcdClear();
lcdSetText("Please wait ...",0,0);
}
}
#pragma vector=PORT2_VECTOR
__interrupt void Port_2(void)
{
P2IE &= ~BIT6;
j++;
P2IE |= BIT6;
P2IFG &= ~BIT6;
}

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

========

Thanks in advance! I'm looking forward for a solution!