jonjones
Member
I'm trying to handle buttons and mechanical rotary encoders in the way I'm used to with Arduino, i.e. gnd -> switch -> pin with pullup enabled and detect a pin low event.
Well, its not working at all. I need to use external pullup to get it to work.
Could someone enlighten me to whats the difference between Arduino and Maple pullups ? Can I do workable buttons and encoders without the need for external pull-ups/downs ?
gbulmer
Moderator
jonjones - the Maple has both pull-up and pull-down resistors on-board.
They are NOT controlled in the same way as the Arduino.
If you look at the specification of pinMode() you can see that the resistors are set using the pin modes INPUT_PULLUP and INPUT_PULLDOWN; there are several other modes.
IMHO, the Arduino technique isn't sufficiently explicit, and doesn't work well if input pins can be pull-up, pull-down or floating inputs, as supported by STM32F MCUs.
(Full disclosure: I am not a member of LeafLabs staff)
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