MicroPython Forum (Archive)

Posted: **Tue May 17, 2022 3:15 am**

Hi,
I tried to run "from machine import PWM" on my pyboard 1.1 that follows the guideline at https://docs.micropython.org/en/latest/ ... e.PWM.html
But why dose it give such error prompt of "ImportError: can't import name PWM"?

Posted: **Tue May 17, 2022 3:19 am**

First thing to do in repl is:

Code: Select all

help('modules')

then

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import machine
dir(machine)

I think
then

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dir(machine.PWM)

maybe quotes around machine and machine.PWM

Posted: **Tue May 17, 2022 5:29 am**

davef wrote: ↑
Tue May 17, 2022 3:19 am
First thing to do in repl is:
Code: Select all
help('modules')
then
Code: Select all
import machine
dir(machine)
I think
then
Code: Select all
dir(machine.PWM)
maybe quotes around machine and machine.PWM

Thanks for the help.
It seems to be an STM32 port specific quirk, see the answer in following post
viewtopic.php?f=15&t=11310&p=61888

Posted: **Tue May 17, 2022 6:45 am**

It's worth noting that the pyb module includes a number of useful STM-specific enhancements.

Posted: **Tue May 17, 2022 3:15 pm**

The pyboard has different methods. See PWM, particularly pyb.Pin and pyb.Timer:

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from pyb import Pin, Timer

p = Pin('X1') # X1 has TIM2, CH1
tim = Timer(2, freq=1000)
ch = tim.channel(1, Timer.PWM, pin=p)
ch.pulse_width_percent(50)

MicroPython Forum (Archive)

Why ImportError: can't import name PWM on pyboard 1.1?

Why ImportError: can't import name PWM on pyboard 1.1?

Re: Why ImportError: can't import name PWM on pyboard 1.1?

Re: Why ImportError: can't import name PWM on pyboard 1.1?

Re: Why ImportError: can't import name PWM on pyboard 1.1?

Re: Why ImportError: can't import name PWM on pyboard 1.1?