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Freq.-counter: using rtcc and timer1

 
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Freq.-counter: using rtcc and timer1
PostPosted: Wed Apr 05, 2006 4:39 am     Reply with quote
Hello,
I am trying to measure the freq on rb4 with the rtcc, while the timer1 is in use (500ms). But at least their doesn't occor either the rtcc interrupt nor the timer1 interrupt. I'm really frustrated.
First I have tried the final measure with a delay, but it didn't work either.

What am I doing wrong?
Please help!!

Code:
#include <16f876.h>
#device ICD=TRUE
#device ADC=10
#fuses HS,NOWDT,NOPROTECT,PUT,NOBROWNOUT,NOLVP,NOCPD,WRT
#USE DELAY (clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, parity=n, bits=8, force_sw, invert)
//#include <lcd_n.c>

int32 count;
int32 teiler;
int32 sol;
int16 overflow=0;
int8 timer=0;

#priority rtcc,timer2

#int_timer2
time_interrupt()
{
timer++;
}

#int_RTCC
rtcc_isr()   //Interrupt-Routine
{
   overflow++;
}

void init()
{
   //lcd_init();

   setup_timer_0 (RTCC_DIV_1|RTCC_EXT_L_TO_H);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DIV_BY_4,255,10);
   enable_interrupts(INT_RTCC);
   enable_interrupts(INT_TIMER2);
   enable_interrupts(GLOBAL);


}

void main()
{
  init();

  while(1)
   {
   //measure for prescaler:
     setup_counters(RTCC_EXT_L_TO_H,RTCC_DIV_256);
     set_rtcc(0);
     delay_us(256);
     count=get_rtcc();
     printf("Grob: %lu",count);

   //prescaler:

      setup_counters(RTCC_EXT_L_TO_H,RTCC_DIV_2);
      teiler=2;
      If (count>=4)
      {
            setup_counters(RTCC_EXT_L_TO_H,RTCC_DIV_4);
            teiler=4;
      }
      If (count>=8)
      {
            setup_counters(RTCC_EXT_L_TO_H,RTCC_DIV_8);
            teiler=8;
      }
      If (count>=16)
      {
            setup_counters(RTCC_EXT_L_TO_H,RTCC_DIV_16);
            teiler=16;
      }
      If (count>=32)
      {
            setup_counters(RTCC_EXT_L_TO_H,RTCC_DIV_32);
            teiler=32;
      }

//detailed measure:
      sol=0;
   count=0;
      overflow=0;
      set_rtcc(0);
      set_timer2(0);
      clear_interrupt(INT_RTCC);
      clear_interrupt(INT_TIMER2);
      enable_interrupts(INT_RTCC);
      enable_interrupts(INT_TIMER2);
      do
      {
         printf("timer: %U",timer);
      } while (timer<250);

      count=get_rtcc();

   //calculation and output:
      sol=2*(int32)teiler*((int32)count+overflow*256);
      printf("Frequ: %lu",sol);
      printf("Overf: %lu",overflow);
      }
}
Guest
PostPosted: Wed Apr 05, 2006 6:49 am     Reply with quote
Would be great if anybody could help me...
mpfj



Joined: 09 Sep 2003
Posts: 95
Location: UK

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PostPosted: Wed Apr 05, 2006 7:27 am     Reply with quote
I don't have a 16F876, but your code appears to work on my 18F8720 demo board.

I would suggest you try something a bit simpler, i.e. setup *just* the timer interrupt or *just* the RTCC interrupt and see if they work ... e.g.

Code:
#include <16f876.h>
#device ICD=TRUE
#fuses HS,NOWDT,NOPROTECT,PUT,NOBROWNOUT,NOLVP,NOCPD,WRT
#use DELAY (clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, parity=n, bits=8)

int8 timer = 0;

#int_timer2
void timer_interrupt(void) {
   timer++;
}

void main(void) {
   setup_timer_2(T2_DIV_BY_4,255,10);
   
   set_timer2(0);
   
   clear_interrupt(INT_TIMER2);
   
   enable_interrupts(INT_TIMER2);
   enable_interrupts(GLOBAL);
   
   while (1) {
      printf("timer: %U", timer);
   }
}
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