On Wed, 16 Oct 2013 14:12:24 -0400, Christopher Havel wrote:
Here, have a scan, guys! -->http://i.imgur.com/f2lbm3R.jpg
There's the VGA interface. Any tweaks you want to add, add.
WOW
To enable 18b VGA you need one GPIO. Adding 24b capability requires a second GPIO. The circuit as drawn uses GPIO3 and GPIO4 to not conflict with the earlier schematics which use GPIOs 0,1,2 to drive the Ethernet port LEDs.
How about putting those VGA GPIO on an I2C extender to keep GPIO free for something that needs GPIO? - Just a thought :-)
HC
On Thu, Oct 17, 2013 at 5:13 AM, Hans-Christian Jehg hc@jehg.dk wrote:
On Wed, 16 Oct 2013 14:12:24 -0400, Christopher Havel wrote:
Here, have a scan, guys! -->http://i.imgur.com/f2lbm3R.jpg
There's the VGA interface. Any tweaks you want to add, add.
WOW
To enable 18b VGA you need one GPIO. Adding 24b capability requires a second GPIO. The circuit as drawn uses GPIO3 and GPIO4 to not conflict with the earlier schematics which use GPIOs 0,1,2 to drive the Ethernet port LEDs.
ah right, i hadn't spotted this earlier. that driving has to be done in software, i.e. it will be necessary to tie in polling of the MII interface from the RTL8201 (link light up) into a kernel module that then pulls GPIO high or low as appropriate.
... to be absolutely honest it sounds like a lot of hassle!
How about putting those VGA GPIO on an I2C extender to keep GPIO free for something that needs GPIO? - Just a thought :-)
depends on whether it's a PC product or an engineering product.
thoughts?
arm-netbook@lists.phcomp.co.uk
-
Hans-Christian Jehg -
luke.leighton