#include "io430.h"
#include "intrinsics.h"
#include "LCD.h"
#include "stdio.h"

#define GO 1
#define STOP 0

int mm=0, ss=0, cc=0, mode=GO;

int main( void )
{ 
  char strDisp[8+1];
  float freq;
  // Stop watchdog timer to prevent time out reset 
  WDTCTL = WDTPW + WDTHOLD; // Stop WDT
  
  P2DIR |= 0x01; // P2.0 output
  P2OUT = 0;
  CCTL0 = CCIE;  // CCR0 interrupt enabled
  
  // fréquence = 32768/CCR0 [Hz]
  freq = 100; // Hz
  CCR0 = 32768/freq - 1; 
  TACTL = TASSEL_1 + MC_1;  // ACLK, upmode
  
  P1IES &= 0x00;   // interrupt P1.x au flancs montants
  P1IE  |= 0x01;   // enable interrupt P1.x
  P1IFG  = 0;  

  __enable_interrupt();
  
  LCD_init();   // initialise et efface LCD
  
  while (1)
  { 
    if (mode == GO)
    { sprintf(strDisp, "%02d %02d %02d", mm, ss, cc);  
      LCD_print(strDisp);
    }
  }
}

// Timer_A TACCR0 interrupt vector handler
#pragma vector= TIMERA0_VECTOR
__interrupt void int_timerA(void)
{
  cc++;  // ajouter un centième de seconde
  if (cc == 100)
  { cc = 0;
    ss++;  // ajouter une seconde
    P2OUT ^= 0xCF;      // Toggle P2.x toutes les demi-secondes
  }
  if (cc == 50)
    P2OUT ^= 0xCF;      // Toggle P2.x
  if (ss == 60)
  { ss = 0;
    mm++;  // ajouter une minute
  }
  if (mm == 60)  mm=0;
}
 
// routine d'interruption de P1
#pragma vector=PORT1_VECTOR
__interrupt void Port1_ISR (void)
{ 
  if (P1IFG == 0x01)   
  { if (mode == GO)
    { CCTL0 = 0;     // CCR0 interrupt disabled
      mode = STOP;
    }
    else
    { CCTL0 = CCIE;  // CCR0 interrupt enabled
      mode = GO;
    }
    P1IFG = 0;
  }
}