PIC16F690 not generating PWM for full bridge output

[electrophysics]

Hi! I'm programming a PIC16F690 to generate diagonal PWM outputs to be given to full bridge and later filtered. However the code is not working. May be some body rectify the issue. I'm getting some PWM output on P1A (RC5) pin only. The code is,

#include <xc.h>
#include <pic.h>
#include <stdio.h>
#include <stdlib.h>

#define _XTAL_FREQ 20000000
// #define FOSC 20000000L


void init_micro (void);
void init_pwm_pos (void);
void init_pwm_neg (void);
void pwm_dr(unsigned int dr);
void gen_sin(void);
void init_pdr_array (void);

static int pdr, pdr_array[27];


void main (void)
{
	init_micro();
	init_pdr_array();
	do
	{
		init_pwm_pos();
		gen_sin();
		init_pwm_neg();
		gen_sin();
	}
	while(1);
}

void init_micro (void)
{
	OSCCON= 0b00001000;	// EXTERNAL HS OSCILLATOR
	TRISA = 0b11101111;    
	TRISB = 0b00111111;
	TRISC = 0b10000011;   
	ANSEL = 0b00010000;   
	ANSELH =0b00001100;	
//	RB6 = 1;
//	RB7 = 1;
	PORTC = 0b00000000;
}

void gen_sin(void)
{
	int i;
	for(i = 1; i < 25; i++)
	{
		pdr = pdr_array[i];
		pwm_dr(pdr);
		__delay_us(204);
	}
	for(i = 24; i > 0; i--)
	{
		pdr = pdr_array[i];
		pwm_dr(pdr);
		__delay_us(204);
	}
}

void init_pdr_array(void)
{
	pdr_array[0] = 0;  //[0] INTENTIONALLY STOPPED TO OCCUR
	pdr_array[1] = 66;
	pdr_array[2] = 131;
	pdr_array[3] = 196;
	pdr_array[4] = 261;
	pdr_array[5] = 324;
	pdr_array[6] = 386;
	pdr_array[7] = 446;
	pdr_array[8] = 504;
	pdr_array[9] = 560;
	pdr_array[10] = 614;
	pdr_array[11] = 666;
	pdr_array[12] = 714;
	pdr_array[13] = 760;
	pdr_array[14] = 803;
	pdr_array[15] = 842;
	pdr_array[16] = 878;
	pdr_array[17] = 910;
	pdr_array[18] = 938;
	pdr_array[19] = 962;
	pdr_array[20] = 983;
	pdr_array[21] = 999;
	pdr_array[22] = 1012;
	pdr_array[23] = 1020;
	pdr_array[24] = 1024;
}


void init_pwm_pos (void)
{
  	TRISC = 0b10111111;   //DISABLE OUTPUT
	PORTC = 0b00000000;
	PR2 = 255;
	CCP1CON = 0b01001100;	//ACTIVE HIGH, FULLBRIDGE A & D OUTPUT
	pdr = 0;
	pwm_dr(pdr);
	PIR1 = (PIR1 | 2);
	T2CON = 0b00000101;  //POST SCALER 1:1, PRE 1:4 TIMER ON
	while(!(PIR1 & 2));
    TRISC = 0b10000011;   //ENABLE OUTPUT
	TMR2 = 0;
}

void init_pwm_neg (void)
{
    TRISC = 0b10111111;   //DISABLE OUTPUT
	PORTC = 0b00000000;
	PR2 = 255;
	CCP1CON = 0b11001100;	//ACTIVE HIGH, FULLBRIDGE B & C OUTPUT
	pdr = 0;
	pwm_dr(pdr);
	PIR1 = (PIR1 | 2);
	T2CON = 0b00000101;  //POST SCALER 1:1, PRE 1:4 TIMER ON
	while(!(PIR1 & 2));
    TRISC = 0b10000011;   //ENABLE OUTPUT
	TMR2 = 0;
}

void pwm_dr(unsigned int dr)
{
	CCPR1L = (dr >> 2);                          
	CCP1CON = ((CCP1CON & 0xF) + ((dr << 4) & 0x30));   // set bits 4 and 5
}

 

[Okada]

There are two options for Full-Bridge mode using ECCP.

One is P1A modulated and another is P1D modulated. Don't know why microchip did like this. In PIC18F26K22 or PIC18F46K22 you get two modulated PWMs in Full-Bridge mode.

If you want two modulated PWMs then change PIC to PIC18F26k22.