problem in coding use dsPIC33F64MC802

#include <p33FJ64MC802.h>

_FOSCSEL(FNOSC_FRCPLL)              //set clock for internal OSC with PLL
_FOSC(OSCIOFNC_OFF & POSCMD_NONE)   //no clock output, external OSC disabled
_FWDT(FWDTEN_OFF)                   //disable the watchdog timer
_FICD(JTAGEN_OFF & ICS_PGD1);       //disable JTAG, enable debugging on PGx1 pins

void initpwm(void){
    P1TCON = 0x8000; //free running, time base on, fcy 1:1, run in cpu idle mode
    PWM1CON1bits.PMOD1 = 1;  //Select Independent Output PWM mode
    PWM1CON1bits.PEN1H = 1;  //PWM1H control by PWM module
    PWM1CON1bits.PEN1L = 0;  //PWM1L control as GPIO
    PWM1CON2=0b0000000000000010;
    P1DTCON1=0;
    P1FLTACON=0;
    P1TMR=0;
}

int main (void){
    OSCCON=0x22E0;
    CLKDIV=0;
    // setup internal clock for 80MHz (Fosc) 
    // Fcy=Fosc/2 (Fcy = 40MHz)
    // 7.37/2*43=158.455/2=79.2275MHz
    CLKDIVbits.PLLPRE=0;        // PLLPRE (N2) 0=/2
    PLLFBD=41;                   // pll multiplier (M) = +2
    CLKDIVbits.PLLPOST=0;       // PLLPOST (N1) 0=/2
    initpwm();
    LATBbits.LATB14 = 0;
    TRISBbits.TRISB14 = 0;
    P1TPER=1599;
    //PTPER = (Fcy/(Fpwm*prescaler))-1
    //PTPER = (40M/(25k*1))-1
    //Fpwm is desire freq for motor.
    while (1){
        P1DC1=0;
    }
}

T3CON = 0x8000;         // enable TMR3, prescale 1:1, internal clock
    PR3 = PWMperiod;        // set the period in ms
    DutyCyc = PR3/2;        //  50% Duty cycle     
    _T3IF = 0;              // clear interrupt flag
    _T3IE = 1;              // enable TMR3 interrupt

    // 3. set the initial duty cycles
    OC1R = OC1RS = Offset;  // 
    OC2R = OC2RS = Offset;  // 

    // 4. activate the PWM modules 
    OC1CON = 0x000E;        // CH1 and CH2 in PWM mode, TMR3 based
    OC2CON = 0x000E;