[Arm-netbook] RGB/TTL interface

[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Sun, Aug 28, 2016 at 7:01 PM, Louis Pearson
<desttinghimgame at gmail.com> wrote:
> Thanks for ask these replies! I'm pretty new to displays do this has been
> very informative. For the project in working on, I'll be using a smaller
> screen, maybe with a touch screen. Something like this:
>
> http://m.ebay.com/itm/161863547262?_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20150831081539&need=62b51881f4054df6a178d0b1ebe1038d&pid=100518&rk=4&rkt=25&sd=262136737363&_trksid=p2349624.c100518.m4111&_mwBanner=1
>
> According to the page it accepts an 8-bit signal. From the looks of it, this
> would be able to directly use the RGB/TTL signal.

 nope - as chris points out, that's a "MCU" style interface (similar
to the old IBM XT bus).  8-bit data/address, 1 line to say "it's
address or data", 1 bit to say "it's read or write" and another for
"clock".

 you _could_ use it... you'd have to track down the datasheet for the
controller IC.

 basically.... welcome to my world!  now you see why the project's
taken 5 years!  you've been on this for 2 days and you're tracking
down just *one* of the components - the LCD!  now you also have to
find a trusted supplier...

> Another question I have is about SPI based displays. There seems to be a lot
> in this size range.

 yes.. because the controller ICs are extremely low-cost.

> Would those be able to display hardware accelerated
> video?

 not a snowball in hell's chance.  25mbit/sec *serial* data transfer -
you can do the maths.

> Is that even a concern with this small of a display?

 try to find a video of the Adafruit HX8357D SPI-based LCD, you'll see
that the drawing rate is veeery slow.

l.