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Forum Index : Microcontroller and PC projects : Pico PWM question

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apalert
Newbie

Joined: 06/07/2023
Location: Australia
Posts: 35

Posted: 09:53am 04 Jan 2025

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Struggling to get channel B working on a pico. Wanting to use pin 12 which is PWM4B. In the following code, entered at the console prompt, pin 11, which is PWM4A, works fine. Pin 12 I come to grief!

> setpin 11, pwm
> pwm 4, 100, 50
> pwm 4, off
>
> setpin 12, pwm
> pwm 4, 100, 50
Error : Pin not set for PWM
> pwm 4b, 100, 50
Error : Expression syntax
>

Appreciate if someone can put me out of my misery :)

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10243

Posted: 09:59am 04 Jan 2025

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From the manual

Quote PWM channel, frequency,[dutyA][,dutyB][,phase][,defer]

So if I don't want dutyA but do want dutyB it becomes

PWM channel, frequency,,dutyB[,phase][,defer]

apalert
Newbie

Joined: 06/07/2023
Location: Australia
Posts: 35

Posted: 10:23am 04 Jan 2025

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Awesome, thanks Peter
I did read manual I promise, just too dense to figure it out! Your example was a great help.

Canada_Cold
Regular Member

Joined: 11/01/2020
Location: Canada
Posts: 42

Posted: 11:46am 04 Jan 2025

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apalert,

I worked on a project last fall that required a PWM output. I found the following post Very helpful.

"PWM out, need some examples, not working for me."

https://thebackshed.com/forum/ViewTopic.php?TID=16947&PID=221685#221685

Don

apalert
Newbie

Joined: 06/07/2023
Location: Australia
Posts: 35

Posted: 03:24am 05 Jan 2025

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Canada_Cold said apalert,

I worked on a project last fall that required a PWM output. I found the following post Very helpful.

"PWM out, need some examples, not working for me."

https://thebackshed.com/forum/ViewTopic.php?TID=16947&PID=221685#221685

Don

Thanks Don

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