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WinAVR GCC timers and interrupts

2004-01-19 by Adrian

Hi,

I'm struggling to collate the info in the 2313
datasheet and the include files for winavr
distribution of GCC.

I want to learn to use the timers & interrupts. I
started off with a polled timer test (writing code
from memory so may not be precise) to add interruopt
driven later:

TCNT0=0;// set timer counter
TCCR0=1<<CS02|1<<CS00;// set to /1024

do {} while (~(TIFR & TOVR0)) // wait for overflow

This appeared to hang in loop for ever  - I'd expected
it to pass straight through after a miniscule pause.


Any ideas what's wrong?

As regards interrupts, I looked at docs avr/signal.h
and couldn't decide if an sei was required or not.

Is there a URL with GCC code fragment to show proper
usage of INTERRUPT macro etc?

TIA,

Adrian



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Re: [AVR-Chat] WinAVR GCC timers and interrupts

2004-01-19 by Rogier Schouten

Hi,

I only know assembler, so this may not be what you are looking for:

You should enable the timer interrupt in TIMSK (don't know which bit right now) and all interrupts using SEI.

Rogier

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----- Original Message -----

From: Adrian

To: AVR-Chat@yahoogroups.com

Sent: Monday, January 19, 2004 9:36 AM

Subject: [AVR-Chat] WinAVR GCC timers and interrupts

Hi,

I'm struggling to collate the info in the 2313
datasheet and the include files for winavr
distribution of GCC.

I want to learn to use the timers & interrupts. I
started off with a polled timer test (writing code
from memory so may not be precise) to add interruopt
driven later:

TCNT0=0;// set timer counter
TCCR0=1<
do {} while (~(TIFR & TOVR0)) // wait for overflow

This appeared to hang in loop for ever - I'd expected
it to pass straight through after a miniscule pause.

Any ideas what's wrong?

As regards interrupts, I looked at docs avr/signal.h
and couldn't decide if an sei was required or not.

Is there a URL with GCC code fragment to show proper
usage of INTERRUPT macro etc?

TIA,

Adrian

=====
-
*********************************************

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your friends today! Download Messenger Now
http://uk.messenger.yahoo.com/download/index.html

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