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How to use #use pwm()

 
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dmitrboristuk



Joined: 26 Sep 2020
Posts: 27

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How to use #use pwm()
PostPosted: Thu Jun 24, 2021 1:32 am     Reply with quote

How to use #use pwm() on devices with multiple independent PWMs ?
For example: is it possible to apply this directive for separate control of PWM1, PWM2, PWM3, PWM4 ? And if so, then how exactly to do it for BIF pwm_off() and pwm_on() ?
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Thu Jun 24, 2021 2:15 am     Reply with quote

Using multiple #use pwm statements is shown here:
http://www.ccsinfo.com/forum/viewtopic.php?t=59193&highlight=pwm

Each pwm, needs a specific stream name, and this can then be given
to the off/on functions.
dmitrboristuk



Joined: 26 Sep 2020
Posts: 27

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PostPosted: Thu Jun 24, 2021 3:20 am     Reply with quote

Code:

#use delay ( clock = 16000000 )
#USE PWM(CCP1, OUTPUT=PIN_C1, TIMER=2, FREQUENCY=10kHz, DUTY=50, PWM_OFF, STREAM=1)
#USE PWM(PWM3, OUTPUT=PIN_C2, TIMER=4, FREQUENCY=5kHz, DUTY=25, PWM_OFF, STREAM=2)
#USE PWM(PWM4, OUTPUT=PIN_C3, TIMER=6, FREQUENCY=3.33kHz, DUTY=16.6, PWM_OFF, STREAM=3)

// for example

void main(void)     
{

   pwm_on (1);
   pwm_on (2);
   pwm_off (3);
   delay_ms (20);
   pwm_off (1);
   pwm_off (2);
   pwm_on (3);

   while(TRUE)
   {}           
}


is it right?
Ttelmah



Joined: 11 Mar 2010
Posts: 17318

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PostPosted: Thu Jun 24, 2021 3:55 am     Reply with quote

Stream names, need to be unique names, not just numbers.
Without knowing what chip you are using, can't know if it supports
the pins and timers you are specifying.
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