8051 to DVI interface?
in [Embedded]
|
From: Paul Carpenter on 13 Feb 2007 05:06 On Monday, in article <7y7Ah.5884$o61.2906(a)newssvr19.news.prodigy.net> spam(a)spam.com "nappy" wrote: >"Paul Carpenter" <paul$@pcserviceselectronics.co.uk> wrote in message >news:20070212.1921.325648snz(a)pcserviceselectronics.co.uk... >> >> What type of DVI interface are you going to do >> Analog > >What is an analog DVI interface? :) That would be 'funny' if you were right but you are wrong as analog DVI interface for monitors exists. I suggest you read up on the matter as that is refered to as DVI-A connections. The other references below refer to single link, compared to dual link for larger displays and alternate pixels on alternate links to reduce clock speeds. >> Digital DVI-D >> Both at same time DVI-I ..... >> Is colour required? > >I don' think there is a monochrome DVI protocol. The same as a monochrome RGB, making all channels the same, colour depends on the application driving the signals. -- Paul Carpenter | paul(a)pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.gnuh8.org.uk/> GNU H8 & mailing list info <http://www.badweb.org.uk/> For those web sites you hate
From: jasen on 14 Feb 2007 05:25 On 2007-02-12, Guy Macon <http> wrote: > > > jasen wrote: >> >>Guy Macon <"http://www.guymacon.com/"@example.com> wrote: >>> This is a small-volume project with no particular cost, >>> space, environmental or power constraints. The display >>> is mostly static with a few small areas that change >>> infrequently. 640x480 would be acceptable, but 1024x768 >>> would be a lot easier to find monitors for. I am also >>> willing to spring for a fast 100 Mips 8051 if that will >>> help. >>> >>> My first thought was having a counter clock data out of >>> fast RAM into DACS and thus make a VGA signal, with the >>> 8051 updating another bank of RAM and making a fast bank >>> switch during vertical retrace, but then I started >>> thinking about DVI interfaces. Normally a PC throws a >>> lot of fast data at a DVI interface, but would it hold >>> a static picture with a much slower refresh rate? Or >>> could I run RAM fast enough to hit a 60Hz refresh? >>> >>> Another possibility would be some sort of display chip; >>> does anyone know of one suitable for a slow 8-bit micro? >> >>how about an 8-bit VGA card? > > Hmmm. No acual ISA cards on the market nowdays, but there > are PC104 cards. A 8051 to PC104 interface might do it. used ones are easily had in small volumes, the hardware, if treated as VGA, should perform near identically across different brands if N of identical cards can't be found. some of them want +/- 12V supplies which may be a hassle. Bye. Jasen
From: Mike Harrison on 14 Feb 2007 10:48 On 14 Feb 2007 10:25:15 GMT, jasen <jasen(a)free.net.nz> wrote: >On 2007-02-12, Guy Macon <http> wrote: >> >> >> jasen wrote: >>> >>>Guy Macon <"http://www.guymacon.com/"@example.com> wrote: > >>>> This is a small-volume project with no particular cost, >>>> space, environmental or power constraints. The display >>>> is mostly static with a few small areas that change >>>> infrequently. 640x480 would be acceptable, but 1024x768 >>>> would be a lot easier to find monitors for. I am also >>>> willing to spring for a fast 100 Mips 8051 if that will >>>> help. >>>> >>>> My first thought was having a counter clock data out of >>>> fast RAM into DACS and thus make a VGA signal, with the >>>> 8051 updating another bank of RAM and making a fast bank >>>> switch during vertical retrace, but then I started >>>> thinking about DVI interfaces. Normally a PC throws a >>>> lot of fast data at a DVI interface, but would it hold >>>> a static picture with a much slower refresh rate? Or >>>> could I run RAM fast enough to hit a 60Hz refresh? >>>> >>>> Another possibility would be some sort of display chip; >>>> does anyone know of one suitable for a slow 8-bit micro? >>> >>>how about an 8-bit VGA card? >> >> Hmmm. No acual ISA cards on the market nowdays, but there >> are PC104 cards. A 8051 to PC104 interface might do it. > >used ones are easily had in small volumes, the hardware, >if treated as VGA, should perform near identically across >different brands if N of identical cards can't be found. > >some of them want +/- 12V supplies which may be a hassle. > How about something like this : http://www.dontronics-shop.com/product.php?productid=16386&cat=262&page=1
From: Engineer on 14 Feb 2007 11:32 Mike Harrison wrote: >How about something like this : >http://www.dontronics-shop.com/product.php?productid=16386&cat=262&page=1 That would be an easy solution. The more I look into DVI the better a plain old 640x480 VGA looks. It might just turn out that displays with 15-pin VGA inputs will be available long after DVI is replaced by The Next New Thing. Still, the idea of a fast-clocked counter clocking a DVI signal out of SRAM is appealing enough to where I will most likely breadboard one up and see how well it works.
From: Paul Carpenter on 14 Feb 2007 14:19
On Wednesday, in article <7bOdna6KDfIIpE7Y4p2dnA(a)giganews.com> http://www.guymacon.com/ "Engineer" wrote: >Mike Harrison wrote: > >>How about something like this : >>http://www.dontronics-shop.com/product.php?productid=16386&cat=262&page=1 > >That would be an easy solution. The more I look into DVI the >better a plain old 640x480 VGA looks. It might just turn out >that displays with 15-pin VGA inputs will be available long >after DVI is replaced by The Next New Thing. Most DVI monitors accept analog input on the DVI connector so you can just use a connector adapter like 'gender benders'. >Still, the idea of a fast-clocked counter clocking a DVI signal >out of SRAM is appealing enough to where I will most likely >breadboard one up and see how well it works. Come back if you have problems doing this worked on many things like this over the years. -- Paul Carpenter | paul(a)pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.gnuh8.org.uk/> GNU H8 & mailing list info <http://www.badweb.org.uk/> For those web sites you hate |