DTMF decoder code

DTMF.pde

#include <PinChangeInt.h>

#define PIN1 2
#define PIN2 3
#define PIN3 4

uint8_t latest_interrupted_pin;
uint8_t interrupt_count[20]={0}; // 20 possible arduino pins
int i;
void quicfunc() {
  latest_interrupted_pin=PCintPort::arduinoPin;
  interrupt_count[latest_interrupted_pin]++;
};

// You can assign any number of functions to any number of pins.
// How cool is that?

int number[11];
void pin3func() {
  number[i]=(PINC&0x0f);
  i++;
//  Serial.print("Pin "); Serial.print(PIN3, DEC); Serial.println("!");
}

char ph[12];

void setup() 
{
  Serial.begin(115200); 
    if (SD.begin(10))
{
  Serial.println("Card initialised ....");
}

    pinMode(PIN1, INPUT); digitalWrite(PIN1, HIGH);
    PCintPort::attachInterrupt(PIN1, &quicfunc, FALLING);  // add more attachInterrupt code as required
    pinMode(PIN2, INPUT); digitalWrite(PIN2, HIGH);
  PCintPort::attachInterrupt(PIN2, &quicfunc, FALLING);
  DDRC=0x00;
  pinMode(PIN3, INPUT); digitalWrite(PIN3, HIGH);
  PCintPort::attachInterrupt(PIN3, &pin3func, RISING);
  
  Serial.println("---------------------------------------");
  Serial.println("Ready");

DTMF();
   
}

void DTMF()
{
     while(i != 10)
   {
     delay(100);
  }    
    for(i=9;i>=0;i--)
    {
      if(number[i]==10) number[i]=0;
      ph[i]=number[i]+'0';
      //Serial.println(number[i],DEC);
    }
    ph[10] = '\0';
    Serial.println(ph);    
    i=0;    
}