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Need help solving the following problem while using Proteus Simulation

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mischa

New Member
Hi there guys. I have access to the Proteus 7 professional package and was using it to try and simulate the pwm generation using the ccp1 module of the pic16f877. I want to gate the RC2 pin so that the pwm appears as an output on it for a while and then disappears. The Pwm is generated and i can see it in the oscilloscope. The problem i am having is that the pwm does not stop or not appear on RC2 even though i set port c as an input. Please take a look at my code and let me know if i am doing something wrong in my code or if its my simulations. I am using c to code in the ccs environment.



#include "16F877.h"
#include "DEFS_877.h"

#include "string.h"
#include <stdlib.h>
#include <stdio.h>

#use delay (clock=7680000)
#fuses HS,NOWDT,PROTECT,NOLVP,BROWNOUT,PUT
//#use rs232(baud=56000,parity=N,xmit=PIN_C6,rcv=PIN_C7)

void squarewave (void);
void pwmgenerated (void);

unsigned int a,i;

port_b_pullups(TRUE); // when no signal output of b is low
set_tris_d(0x00); //setting port d as output

void main (void)
{
a=0;
while(1)
{

if (a==0)
{
pwmgenerated();
delay_ms(15);
}
set_tris_c(0xFF); //set port c as input...now the pwm will not be visible on RC1. This does not work in the simulations! I even triedthis: set_pwm1_duty(0)
}
}


//this function generates a 120khz pwm
void pwmgenerated (void)
{

setup_timer_2(T2_DIV_BY_1,15,1); //ENABLES TIMER2,pR2=15, PRESCALAR=1
setup_ccp1(CCP_PWM); //enable Pwm mode
set_pwm1_duty(8); //sets 50% DC
a=1;
}



 
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