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set_pwm1_duty : range of the parameter ?

 
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franckcl



Joined: 12 Sep 2003
Posts: 32
Location: France (Paris)

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set_pwm1_duty : range of the parameter ?
PostPosted: Mon Aug 20, 2007 7:20 am     Reply with quote
Hi,

I have a question about the use of the funcion set_pwm1_duty(int value).
What is the range of the value passed into parameter ?
I have tried that :

Code:

unsigned char b;
b=101;
set_pwm1_duty(b);

So for exactly 101, the output is at the maximum !
Why ? it is a 8 bit value so I should have the maximum for 255 ?
(I have tried using a 16 bits variable, and the maximum is for obtained at 404)

Thank you
franck
Ttelmah
Guest
PostPosted: Mon Aug 20, 2007 7:24 am     Reply with quote
The range, depends on what timer2 is set to.
If you setup timer2, with:

setup_timer_2(T2_DIV_BY_1,100,1);

Then the maximum width that can be used is 100. If you chose:

setup_timer_2(T2_DIV_BY_1,255,1);

The output frequency will be just 1/2.55 of the former example, but the count can go to 255.

Best Wishes
Guest
PostPosted: Mon Aug 20, 2007 7:30 am     Reply with quote
Thank you very much for this fast answer Ttelmah !
My timer is set to : setup_timer_2(T2_DIV_BY_16,100,13);

So I anderstand now !
Thank you again, you are a champion !
franck
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