help for 2MHz pwm using pic16f877a

[pany2008]

Hi,

I am having problem for pwm using pic16f877a, I am not getting the pulse output from microcontroller. Please can you help me out for seeing my source code if their is any thing wrong or missing then please help me out.

#include<pic.h>
#include<math.h>
#include "ioports1.h"
#include "delay.h"
#include "lcd.h"

__CONFIG (HS & DEBUGDIS & WDTDIS & BORDIS & PWRTEN & LVPDIS & PROTECT);

unsigned int dummy_sec;

void Sec(unsigned int);

void main()
{
Sec(100);
init_ports();
Sec(50);
lcd_init(); //LCD initialized
Sec(25);

lcd_line1(0); //LCD address specified AT LINE 1
lcd_string(" PANKAJ PATEL "); //Displays message "LCD INTERFACING"
lcd_line2(0); //LCD address specified AT LINE 2
lcd_string(" PWM EXAMPLE "); //Displays message "LCD INTERFACING"

Sec(200);
init();

for(;
{
GIE = 1;
lcd_line1(0); //LCD address specified AT LINE 1
lcd_string(" PANKAJ PATEL "); //Displays message "LCD INTERFACING"
lcd_line2(0); //LCD address specified AT LINE 2
lcd_string(" PWM EXAMPLE "); //Displays message "LCD INTERFACING"
}
}

init_ports()
{
T_CPU_LED = 0; // pin enable to output
CPU_LED = 0;
}

init()
{
TMR1H = 0xfc;
TMR1L = 0x17;
TMR1CS = 0;
T1CKPS0 = 0;
T1CKPS1 = 0;
T1CON = 0b00000001;
TMR1ON = 1;
TMR1IF = 0;
TMR1IE = 1;
PR2 = 0b00000000;
T2CON = 0b00000100;
CCPR1L = 0b00000000;
CCP1CON = 0b00011100;
TMR2ON = 1;
TMR2IF = 0;
TMR2IE = 1;
PEIE = 1;
GIE = 1;
}

void Sec(unsigned int itime)
{
unsigned int i;
unsigned char j;
for(i=0;i<itime;i++)
for(j=0;j<165;j++);
}


void interrupt ISR()
{
if(TMR1IF)
{
PIE1 = 0;
TMR1IF = 0;
TMR1ON = 0;
CPU_LED = !CPU_LED;
++dummy_sec;
if(dummy_sec > 1000)
{
// CPU_LED = !CPU_LED;
dummy_sec = 0;
}

TMR1H = 0xfc;
TMR1L = 0x17;
TMR1ON = 1;
PIE1 = 1;
}

}

 

[john blue]

You need to initialize the port properly first. TRISx = 0 ; // 0 = output , 1 = input