Why this code of PWM doesn't run in pic18f4520 or pic18f4550

[Anderson Liege]

I'm trying to run this code but for some reason this code doesn't work, but if you put in any pic16 doing some adjusted this code runs.
This code is a SPWM (Pwm sinusoidal) , the crystal that I'm using is 20MHz and carrier frequency of 20Khz .

/* PROJETO SPWM COM PIC18f4520
ANDERSON LIEGE
*/

unsigned char sin_table[32]={0, 25, 50, 75, 99, 121, 143, 163, 181,
198, 212, 224, 234, 242, 247, 250, 250, 247, 242, 234, 224, 212, 198,
181, 163, 143, 121, 99, 75, 50, 25,0};

unsigned int TBL_POINTER_NEW, TBL_POINTER_OLD, TBL_POINTER_SHIFT, SET_FREQ;
unsigned char DUTY_CYCLE;

sbit MOSA at RD0_bit;
sbit MOSB at RD1_bit;
sbit MOSC at RD2_bit;
sbit MOSD at RD3_bit;

unsigned char FlagReg;
sbit Direction at FlagReg.B0;
//0 -> MOS A + D
//1 -> MOS B + C

//*******************CONFIGURAÇÃO DOS REGISTRADORES*****************************
void Config_SFR(){
SET_FREQ = 190; //29Hz
TRISB = 0b00010001; //Rb0 e Rb4 como entrada
TRISC = 0; //Porta C como saída
TRISD = 0; //Porta D como saída
PORTB = 0; //Limpa porta B
PORTC = 0; //Limpa porta C
PORTD = 0; //Limpa porta D
PR2 = 249; //Frequência portadora 20kHz
CCPR1L = 0; //Zera Duty
CCP1CON = 0b00001100; //modo PWM
TMR2IF_bit = 0; //Limpa flag da interrupção do Timer 2
INTCON.RBIF = 0; //Limpa flag da interrupção externa de Rb4
T2CON = 0b00000100; //TMR2 on; prescaler e postscaler = 1
INTCON.RBIE = 1; //Habilita interrupção externa no portal B pinos 4-7
PEIE_bit = 1; //Habilita interrupção de periféricos
TMR2IE_bit = 1; //Habilita interrupção do Timer 2
GIE_bit = 1; //Habilita interrupção Global
}
//******************************************************************************
//************************ROTINA DE INTERRUPÇÕES********************************
void interrupt(){
if (TMR2IF_bit == 1){
TBL_POINTER_NEW = TBL_POINTER_OLD + SET_FREQ;
if (TBL_POINTER_NEW < TBL_POINTER_OLD){
if (Direction == 0){
MOSA = 0;
MOSD = 0;
MOSB = 1;
MOSC = 1;
Direction = 1;
}
else{
MOSB = 0;
MOSC = 0;
MOSA = 1;
MOSD = 1;
Direction = 0;
}
}
TBL_POINTER_SHIFT = TBL_POINTER_NEW >> 11;
DUTY_CYCLE = TBL_POINTER_SHIFT;
CCPR1L = sin_table[DUTY_CYCLE];
TBL_POINTER_OLD = TBL_POINTER_NEW;
TMR2IF_bit = 0;
}
}
//******************************************************************************
//*****************************ROTINA PRINCIPAL*********************************
void main(){
Config_SFR();
while (1);
}
//******************************************************************************

[filip]

Hi,

I believe I have answered you on the other topic.

Regards,
Filip.