AVR-Chat

Is there any easy way to stop timer 1 in PWM mode, with the output pin 
high?

I'm using OC1B to generate an output with 100% - 0% duty cycle.

I realize that I could turn off PWM mode entirely, returning the pin to 
a straight I/O.

I could make the turn-off conditional on getting a 0 on the pin 
register, but I'm a little creeped out by that, as it might not always 
dependably read a 1 or 0


What I'm trying to avoid is adding two more states, as "starting up" 
and "shutting down" to my existing "running" and "not running".

> From: Dave VanHorn
> 
> Is there any easy way to stop timer 1 in PWM mode, with the output pin
> high?
> 
> I'm using OC1B to generate an output with 100% - 0% duty cycle.
> 
> I realize that I could turn off PWM mode entirely, returning the pin to
> a straight I/O.
> 
> I could make the turn-off conditional on getting a 0 on the pin
> register, but I'm a little creeped out by that, as it might not always
> dependably read a 1 or 0

Not sure I understand completely (I have not done PWM on an AVR yet) but:

1) At 'idle' times can you just leave the PWM at 100% (i.e.: pin is solid 1)?

2) If, when disabled, the PWM pin reliably goes to 0 you could just run the pin
thru an inverter and use a duty cycle of 0 - 100% rather than 100% - 0%

... but, since I haven't used PWM yet, there's probably something I don't
realize that is getting in the way.

Cheers,

Chuck Hackett
"Good judgment comes from experience, experience comes from bad judgment"
7.5" gauge Union Pacific Northern (4-8-4) 844
http://www.whitetrout.net/Chuck