On Mar 1, 2018, at 20:31, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Thu, Mar 1, 2018 at 10:02 PM, Richard Wilbur richard.wilbur@gmail.com wrote:
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 reason i brought those out is just in case someone decided they wanted to use them as plain GPIO.
Having the most available GPIO pins sounds like a great goal for the micro-desktop. But at the expense of a fully operational VGA interface when we have four more GPIO pins that we could choose from--seems like maybe we could take a better tradeoff?
The other option to accommodate all our GPIO goodness would be to replace J5 (2x10 header) with a 2x11 or 2x12 header
yep.
I would vote for a 2x11 header with the four other GPIO's connected and the VESA DDC lines not connected to the expansion header. That only requires the expansion to extend in length by 10%.