Limit to supported servo pins

[MrTrick]

The Makecode IDE only permits controlling servos on pins A1 and A2.

Adafruit's pinout diagram shows that pins A2,A3,A6,A7 support PWM, (Admittedly servo control is not strictly the same as 'PWM') and a lowly Arduino Uno can control up to 12 servos.

I am not sure how servo control is implemented internally, but is seems like an arbitrary limitation so raising as bug; Can all CPX pins support servoWrite?

See also this Adafruit forum post

[abchatra]

@pelikhan @mmoskal any reason about this limitation?

[pelikhan]

lancaster-university/codal-circuit-playground#5

[pelikhan]

It used to lockup. We need to revisit this in no-mbed. @jamesadevine

[pelikhan]

@ladyada looks like the pinout drawing is missing the PWM curly for A1

[ladyada]

the person who made this diagram for us has disappeared and they used a custom font so we can't seem to edit the PDF. will make a note of it but nothing much we can do

[pelikhan]

You could just wing it with gimp? :)

[ladyada]

gimp doesnt edit pdfs (the original file/download is a pdf)
i added a note

[pelikhan]

Might be lucky with InkScape for a PDF...

[ladyada]

im totally out of time this week :D if someone wants to shave this yak, the PDF is here
https://learn.adafruit.com/adafruit-circuit-playground-express/downloads

[pelikhan]

Limition here: https://github.com/lancaster-university/codal-samd/blob/d12c428f49c9b2c3cccf14841b9c82e7926934d6/src/pwmout.c#L218