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1Hz PWM signal, any ideas?

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jun 19, 2008 7:47 pm     Reply with quote
This thread has the formula to find the lowest PWM frequency for the
hardware PWM module. You'll find that you can't go as low as 1 Hz.
http://www.ccsinfo.com/forum/viewtopic.php?t=17993

For a software routine that can be modified to work at 1 Hz, see my
post near the start of this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=20050

See my comments at the end of this thread for instructions on how
to reduce the PWM frequency with that software routine:
http://www.ccsinfo.com/forum/viewtopic.php?t=30175

I suggest that you change the RTCC divisor to 64 or 128, and
then increase the LOOPCNT value as required. These are the
two lines that you will need to change:
Code:

#define LOOPCNT 39

setup_counters(RTCC_INTERNAL, RTCC_DIV_1);
 


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Edited to fix one of the links.

Last edited by PCM programmer on Thu Sep 11, 2008 3:51 pm; edited 1 time in total
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