26 May
2015
26 May
'15
3:30 p.m.
On May 26, 2015, at 14:07 , Chris Elmquist <chrise
at pobox.com> wrote:
If you do end up building a custom solution, I have a feature request :-)
It would nice if the device was also a frame grabber that could, under
command, snap one or more frames of the legacy video and export it over
USB perhaps.
That was already on my possible-feature list! ;) If I do end up using a Zynq FPGA, then
hanging things like Ethernet and/or USB OTG would be cheap to add. Those wouldn't be
my first priorities to implement in firmware, but I should at least include stuff options
for the connectors and PHYs on the PCB.
I'm not sure yet whether I'd start with a dev board or go straight to a custom
board. The Zybo board is cheap and has the cheaper Zynq chip that I'd like to target,
but it lacks good physical connections for a couple of relatively high-speed DACs, and it
only supports 720p HDMI output because it lacks a dedicated HDMI PHY. I could get 1080p
and an FMC connector out of the much more expensive Zed Board, but it uses a larger Zynq
chip that would be prohibitively expensive for this project, and if I had to build a board
with an FMC connector for my analog front end then I'd already be making a board
that's too advanced for me to solder up at home, so I might as well thrown down the
FPGA, too, rather than spending $500 on a not-quite-right dev board. Sigh...
This would allow us to document operation of legacy
software with high
quality frame grabs since persumably you'd have access to the image
in a relatively good quality domain before you turned it into DVI/HDMI
or whatever.
Agreed! Grabbing some live video might also be an option, but I think that would be a
smaller incremental value add than getting high quality single frame grabs.
BTW, every good project deserves a good project name. I'm tentatively calling this one
"Crazy Cat Lady". It has a nice ring to it.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/