Pinebook SDIO gpio control using SD card slot blog post
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This is my first experiment with bringing some of the A64 gpio mux lines to the outside via the SD card slot;  SDIO.  These are data lines D0-D3, CMD, CLK, VDD, & VSS.  The lines are gpio160 - gpio166;  PF0 - PF6.

The pic above is the 48cm ribbon cable that extends the SD micro slot to a full size card adapter;  this ribbon is useful in itself;  but I plan to modify it for pin access on a solderable bread-board.

         

These two shots are the modified ribbon cable;  this was actually easier than I expected.  The cable will extend under the notebook.

         

The two shots above show the finished cable running;  I have the green and red LED(s) initially connected to CMD and CLK.  These are pulsing at regular 3/4 second intervals (or so).  The gpio(s) are not useful in this state;  next I need to hack the dts and make sure that the pin function register has '0' s. 

Please see this important link:
marcushh777    Cool

please join us for a chat @  irc.pine64.xyz:6667   or ssl  irc.pine64.xyz:6697

( I regret that I am not able to respond to personal messages;  let's meet on irc! )
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Pinebook SDIO gpio control using SD card slot blog post - by MarkHaysHarris777 - 07-20-2017, 04:56 PM

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