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pic16f877 - frequency counter

 
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slyman



Joined: 02 Apr 2015
Posts: 5

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pic16f877 - frequency counter
PostPosted: Fri Apr 17, 2015 1:18 pm     Reply with quote
Hi everyone

I'm trying to measure line frequency.
Code:

#include <16f877.h>
#use delay(clock=4000000)
#fuses XT,NOWDT
#USE TIMER(TIMER=1,TICK=1ms,BITS=8,NOISR) //1ms time count
#define use_portb_lcd TRUE
#include<lcd.c>
unsigned int8 simdiki_zaman, onceki_zaman=0,frekans,periyot ;

#int_timer0
void timer0_kesmesi()
{
set_timer0(255);  // interrupt will take place at each rising edge
simdiki_zaman=get_ticks();

}

void main()
{
   set_tris_a(0xff);
   set_tris_b(0x00);
   output_b(0x00);
   lcd_init();
   setup_timer_0(RTCC_EXT_L_TO_H |  RTCC_DIV_1);
   set_timer0 (255);
   
   enable_interrupts(INT_timer0);
   enable_interrupts(GLOBAL);
   while(1)
   {
     
      frekans= 1/(simdiki_zaman-onceki_zaman);  // f=1/T
      onceki_zaman=simdiki_zaman;
      printf(lcd_putc,"\f frekans=%uHz ",frekans);
      delay_ms(100);
     
   }
}

display values is:
frekans =0
Mike Walne



Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK

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PostPosted: Fri Apr 17, 2015 2:19 pm     Reply with quote
Please start by explaining how you think your code achieves its objective.

Mike
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