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# PULSE OUT Help?????

 
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cxiong
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# PULSE OUT Help?????
PostPosted: Tue Sep 09, 2003 11:46 am     Reply with quote
Hi:

I use PWM to pulse out a square wave signal to drive a stepper motors. The # PULSE will control the step of the motor. Can I control the # of PULSE out?

I use the CCS DEMO board which is PIC16F877.

Anyone written a route to share? :?:
PCM programmer



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PostPosted: Tue Sep 09, 2003 12:10 pm     Reply with quote
Look at the CCS example file, EX_PWM.C, which is available here:

http://www.cc.puv.fi/~t0101190/projekti/source/Examples/
cxiong



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PostPosted: Tue Sep 09, 2003 12:53 pm     Reply with quote
PCM programmer wrote:
Look at the CCS example file, EX_PWM.C, which is available here:

http://www.cc.puv.fi/~t0101190/projekti/source/Examples/


I used the EX_PWM.C for reference on my pwm. But this example only run on different frequencies, it does not generate # of pulse.

Is it generate # of pulse?
PCM programmer



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PostPosted: Tue Sep 09, 2003 1:21 pm     Reply with quote
Sorry. I didn't read your original post closely enough.

The hardware PWM module of the PIC doesn't have
the ability to control the number of pulses out.
It runs continuously.

I think you will have to do it in software.


See the CCS example file, EX_STEP.C, which is in this folder
c:\Program Files\Picc\Examples
and is also available online here:
http://www.cc.puv.fi/~t0101190/projekti/source/Examples/
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