[Arm-netbook] Testing: GPIO

Christopher Havel laserhawk64 at gmail.com
Thu Mar 1 22:05:41 GMT 2018

...BTW, those SCL and SDA lines on a VGA connector are for a nifty signal
coming from your monitor. It's called EDID and it's basically how every
modern OS magically knows what to do with the monitor it wants to display
on, regardless of the specs or origin of said monitor.

If you've ever had a cheap VGA cable where all the pins are present on the
connectors but those two lines are disconnected internally, you have
experience with what happens when you eff with those wires. Best to leave
them alone!

On Thu, Mar 1, 2018 at 5:02 PM, Richard Wilbur <richard.wilbur at gmail.com>

> If we did decide to roll a v1.8 micro-desktop board, it would afford
> us the opportunity to bring two of the presently unconnected GPIO18-21
> lines to the expansion header in place of VESA_SCL and VESA_SDA (which
> are after all available on pins 15 and 12 of the VGA connector).  If
> VESA_SCL and VESA_SDA are more useful on the expansion header then, by
> all means, forget this suggestion.
> The other option to accommodate all our GPIO goodness would be to
> replace J5 (2x10 header) with a 2x11 or 2x12 header allowing us to
> bring all the GPIO pins to the expansion header (the only difference
> being whether we would prefer to retain VESA_SCL and VESA_SDA in the
> header).
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