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pwm in 18f8722 problem

 
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nidal



Joined: 12 Mar 2012
Posts: 6

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pwm in 18f8722 problem
PostPosted: Mon Mar 12, 2012 5:54 am     Reply with quote
Hi all
I am using the version 4.114.
My Crystal is 10MHZ. I am using PLL.

When I want to generate 5khz PWM with 50% duty cycle I don't see anything on the oscilloscope:
Code:

SETUP_CCP2(CCP_PWM );
setup_timer_2(T2_DIV_BY_16, 124, 1);      //5khz
set_pwm2_duty(250);


When I generate 10khz everything is ok.
Please guide me for the problem.
Code:

SETUP_CCP2(CCP_PWM );
setup_timer_2(T2_DIV_BY_4, 249, 1);      //10khz
set_pwm2_duty(500);

Regards
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Mar 12, 2012 11:44 am     Reply with quote
Add an 'L' to the end of 250, as shown below:
Quote:

set_pwm2_duty(250L);


For information on why this is done, read the links on 10-bit PWM in this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=45968&start=1
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