GPIO internal Pullup/Pulldown enables

#1

I’ve installed the LIBMRAA on my Buster image on Rock Pi S. And I’m accessing it from Python 3. That works fine…thanks!

But It doesn’t appear that the Pullup/Pulldown is exposed as something I can control. I’ve tried setting pin.mode(mraa.MODE_PULLUP) and PULLDOWN and they don’t appear to do anything. An unconnected GPIO line reads the same with either setting.

Board: 256M, V13 with 1G NAND, NO BT/WIFI

I’m trying to use the GPIOs on the Header 2 connector, pins 39-46

  1. Is this correct? Can’t control the internal pullup/down? Or am I missing something?

  2. If the mode can’t be set, can you tell me if the internal pullups or pulldowns is enabled?

  3. I believe, looking at the schematic for V13 that GPIO3_B2,3,4,5 are connected to the NAND flash. Is this right? Does this mean I should not use those GPIOs for other purposes?

#2

Hi. I would appreciate some support on this topic. I have the same problem. Does pullup and pulldown commands actually do something ? Do GPIO ports on RockPi 4B have pullup and pulldown resistors that can be configure ?

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#3

I’m facing the same issue with cm 3, i would appreciate some support

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