pwm1_set_dutycycle_ratio() versus pwm1_set_dutycycle_percent()?

[A Webuser]

What input does pwm1_set_dutycycle_ratio() take?  Is it expecting a byte?

Is it linear or is there some unique property to it?

Thanks!

[Rob CJ]

Hi Webuser,

For this you have two options to check:

1. Check the library. It says: procedure pwm1_set_dutycycle_ratio(word in ratio) 
2. Compile it. If you pass a byte or word there will be no warning or error. If you pass an sbyte or other you will get a compiler error or warning.

As far as I can see it is linear.

Kind regards,

Rob

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Van: jal...@googlegroups.com <jal...@googlegroups.com> namens A Webuser <awebu...@gmail.com>
Verzonden: dinsdag 7 maart 2023 03:27
Aan: jallist <jal...@googlegroups.com>
Onderwerp: [jallist] pwm1_set_dutycycle_ratio() versus pwm1_set_dutycycle_percent()?

 

What input does pwm1_set_dutycycle_ratio() take?  Is it expecting a byte?

Is it linear or is there some unique property to it?

Thanks!

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[A Webuser]

OK, sounds good, but odd since a 16-bit value is far beyond the resolution an 8-bit PIC PWM channel can generate, which is at best 10-bit.  It also depends on frequency, etc, so it is typically lower (8-bit is common)

I guess the function does some "magical" scaling to make FFFF essentially equal a 100% PWM duty-cycle.