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Reading and writing to TIMER1 in asynchronous mode

 
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vsmguy



Joined: 13 Jan 2007
Posts: 91

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Reading and writing to TIMER1 in asynchronous mode
PostPosted: Thu Jul 08, 2010 8:23 pm     Reply with quote
I expect to see a continuous stream of values to flow.

Each value should be the number of ticks in timer1 over a 10uS period:

Code:

void main()
{
   delay_ms(5000);

   while(true)
   {
      setup_timer_1( T1_DISABLED );
      set_timer1(0);
      printf("TMR1 = %lu\n\r", get_timer1());
      setup_timer_1( T1_EXTERNAL );
      delay_us(10);   
      setup_timer_1( T1_DISABLED );
      printf("TMR1 = %lu\n\r", get_timer1());

      delay_ms( 1000 );
     
      }
}


However - all I get is one value and then, nothing!

Obviously no interrupts are enabled.
Wayne_



Joined: 10 Oct 2007
Posts: 681

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PostPosted: Fri Jul 09, 2010 2:05 am     Reply with quote
Quite possibly your rs232 interface is hanging but as you don't show your fuses we can not be sure.
vsmguy



Joined: 13 Jan 2007
Posts: 91

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what gave away from just then was a cheap USB <-> RS23
PostPosted: Fri Jul 09, 2010 10:30 am     Reply with quote
Wayne_ wrote:
Quite possibly your rs232 interface is hanging but as you don't show your fuses we can not be sure.


My RS232 port is working fine - what gave away from just then was a cheap Chinese USB <-> RS232 convertor, and this lead me to believe I had messed up.

Reading 33023a.pdf set my ideas straight but now I have some questions:

1. Why would anyone want to enable T1SYNC?

An example scenario would be great

2. I am also intrigued by an old practice of "self-clocking" TMR0 by toggling T0SE to extract the timer0 prescaler value - but I do not get how toggling that bit increments the counter - any insights in this?
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