Rapid Prototyping with 16/32 bits MCU

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#include <p33FJ128MC804.h>

void QEIInit(void){

  
 //QEI configuration register 
  POS1CNT = 0;               // Set Current Position 
  MAX1CNT = 0;              // Use QEI in 2x mode
  
  POS2CNT = 0;               // Set Current Position
  MAX2CNT = 0;              // Use QEI in 2x mode

  DFLT1CON = 0b0000000100000000;        // Digital filter set to off, Count Error Interrupt Disable
  DFLT2CON = 0b0000000100000000;        // Digital filter set to off, Count Error Interrupt Disable

  QEI1CONbits.QEIM = 7;           // x4 reset by MAXCNT pulse
  QEI1CONbits.POSRES = 0;         // doesn't Allow Index pulse to reset counter
  QEI1CONbits.SWPAB = 1;          // direction 
  
  QEI2CONbits.QEIM = 7;           // x4 reset by MAXCNT pulse
  QEI2CONbits.POSRES = 0;         // doesn't Allow Index pulse to reset counter
  QEI2CONbits.SWPAB = 1;          // direction 
  
  //ConfigIntQEI 
    IEC3bits.QEI1IE = 1;                // Enable QEI interrupt
    IPC14bits.QEI1IP = 2;               // Interrupt priority level 2
    
    IEC4bits.QEI2IE = 1;                // Enable QEI interrupt
    IPC18bits.QEI2IP = 2;               // Interrupt priority level 2
   // extern volatile int ct_turns;
   // ct_turns = 0x8000;
    
}



/*------------------------------------------------------------------*/
void __attribute__((__interrupt__)) _QEI1Interrupt(void)
{
   extern volatile int ct_turnsE1;
   // if it overflowed
     if (QEI1CONbits.UPDN ==  1){
       ct_turnsE1++;
     } else {
       ct_turnsE1--;
     }
     IFS3bits.QEI1IF = 0;    // clear the interrupt flag
}

void __attribute__((__interrupt__)) _QEI2Interrupt(void)
{
   extern volatile int ct_turnsE2;
   // if it overflowed
     if (QEI2CONbits.UPDN ==  1){
       ct_turnsE2++;
     } else {
       ct_turnsE2--;
     }
     IFS4bits.QEI2IF = 0;    // clear the interrupt flag
}