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PWM signal generation on PIC18F27K40

 
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Momboz



Joined: 03 Jun 2009
Posts: 29

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PWM signal generation on PIC18F27K40
PostPosted: Mon Feb 20, 2017 11:58 am     Reply with quote
I am trying to get a PWM signal on PIN_C2 and it's not working.
I am using the latest version of the compiler and my code looks like:
Code:
#pin_select CCP1OUT=PIN_C2
setup_ccp1(CCP_PWM);
set_pwm1_duty((int16)498);

The fact is that I am not getting any pulse on PIN_C2 (Checked with oscilloscope).
Any advice on how to proceed or what I am doing wrong?
Many thanks
Ttelmah



Joined: 11 Mar 2010
Posts: 19515

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PostPosted: Mon Feb 20, 2017 12:16 pm     Reply with quote
You haven't setup the timer....
Momboz



Joined: 03 Jun 2009
Posts: 29

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PostPosted: Mon Feb 20, 2017 2:19 pm     Reply with quote
By searching the internet I found the following:
Code:
#use pwm(output=pin_a4, output=pin_b3, timer=1, frequency=1kHz, duty=75)

and this helped me a lot.
Thank for your help.
Ttelmah



Joined: 11 Mar 2010
Posts: 19515

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PostPosted: Wed Feb 22, 2017 3:14 am     Reply with quote
That is the alternative way of setting up.

Beware though. With this you don't know how many bits of resolution the PWM is actually generating. Note that it is setting up the timer for you.....
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