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Problem getting Timer 1 to work....

 
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Guest
Problem getting Timer 1 to work....
PostPosted: Wed Nov 12, 2008 1:47 pm     Reply with quote
Hi All,

I'm having trouble getting Timer1 to run. I think I'm setting it up correctly according to my Version 4.0 manual (August 2006), but the Get_Timer1 statement always returns a 0 :-(!

Here is a short piece of code that demonstrates the problem:
Code:


#include <12F629.h>
#fuses INTRC_IO,NOWDT,NOBROWNOUT,NOPROTECT,MCLR
#use delay(clock=4000000)

#define LCD_Output          Pin_A0
#use rs232(baud=9600, xmit=LCD_Output)

void main()
{
   int16 PulseWidth;
   printf("Hello World \n\r");

      setup_timer_1 ( T1_INTERNAL|RTCC_DIV_256 );
     set_timer1(0);

  while(1)
  {
      PulseWidth = get_timer1();
      printf("Counter value: %2X\n\r", PulseWidth);

  }   //while
} //main



I'm continuously polling Timer1, and sending the data to a PC. I'm expecting that the small delay associated with the printf function will show me a different value for Timer1 each time, but it's always zero!

My compiler version is 4.050

Thanks,

Doug
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Nov 12, 2008 3:47 pm     Reply with quote
Quote:
void main()
{
int16 PulseWidth;
printf("Hello World \n\r");

setup_timer_1 ( T1_INTERNAL | RTCC_DIV_256 );
set_timer1(0);

while(1)
{
PulseWidth = get_timer1();
printf("Counter value: %2X\n\r", PulseWidth);

} //while
}

Look closely at the line in bold. There is a problem on that line. Look at
the 12F629.H file, in the sections on the timers. Hint: What is the name of
each timer ?
Guest
PostPosted: Wed Nov 12, 2008 4:04 pm     Reply with quote
PCM,

Yep, I already found that :-(! The problem is that I was trying to re-use some old Timer0 code, and didn't check it closely enough! I changed the line to:

Code:

setup_timer_1 ( T1_INTERNAL|T1_DIV_BY_8 );


and everything is happy now!

Doug
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