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MPPT using PIC16F877A

 
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Lee_831



Joined: 23 Aug 2010
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MPPT using PIC16F877A
PostPosted: Mon Aug 23, 2010 5:37 am     Reply with quote
Surprised

Last edited by Lee_831 on Tue Sep 14, 2010 12:11 pm; edited 1 time in total
pmuldoon



Joined: 26 Sep 2003
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PostPosted: Mon Aug 23, 2010 8:17 am     Reply with quote
Can't explain the SIM thing, but just a comment:
You will be happier if you put the delay back in after switching AD channels.
Make sure the source impedance is <5K or so and delay for 10-20uS (micro, not milli) should be fine. You can go a bit tighter it just depends on your circuit - the rest is in the AD section of the Datasheet.
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Aug 23, 2010 8:41 am     Reply with quote
Also note that your pwm values, _must_ be passed to the set_pwm function, as _long_ integers, not 8bit values.

set_pwm1_duty((int16) pwm);

Otherwise your PWM range is only 0-13, not 0-49....

Best Wishes
Lee_831



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PostPosted: Mon Aug 23, 2010 12:21 pm     Reply with quote
Confused

Last edited by Lee_831 on Tue Sep 14, 2010 12:12 pm; edited 1 time in total
PCM programmer



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PostPosted: Mon Aug 23, 2010 12:56 pm     Reply with quote
See this thread for links about invoking 10-bit PWM mode:
http://www.ccsinfo.com/forum/viewtopic.php?t=17729&start=12
Lee_831



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PostPosted: Mon Aug 23, 2010 1:18 pm     Reply with quote
Arrow

Last edited by Lee_831 on Tue Sep 14, 2010 12:12 pm; edited 1 time in total
PCM programmer



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PostPosted: Mon Aug 23, 2010 2:38 pm     Reply with quote
The 'L' is for a constant. You're passing a variable, so casting it to a int16
is the correct way. The way that you posted is correct.
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