Post by thread:[OT] Urgent, Video Generator for PIC micro

Could someone please recommend a suitable Video Generator/OSD IC that can be driven from PIC. We would like to put Composite Video in, add text and have composite video out with text/video mixed. The other requirement is that the character set in the device must be programmable from the micro as we mirror image the display at times and need to mirror image text also. Regards David Huisman

David Huisman wrote: > > Could someone please recommend a suitable Video Generator/OSD IC that can be > driven from PIC. > > We would like to put Composite Video in, add text and have composite video > out with text/video mixed. > > The other requirement is that the character set in the device must be > programmable from the micro as we mirror image the display at times and need > to mirror image text also. > > Regards > David Huisman We hope to have a SimmStick in the coming months that will do just this David. As you have designed a SimmStick for your RF modules, i thought I better let you know so that the project isn't doubled up on. And yes it uses the chip Tony was talking about. We are just playing around with the two crystals/software and PAL/NTSC standards. Don McKenzie .....donKILLspam@spam@dontronics.com http://www.dontronics.com The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html The Little "rAVeR!" AVR & Basic Kit http://www.dontronics.com/dt006.html

David Huisman <david.huismanKILLspamADVMININGTECH.COM.AU> wrote: > Could someone please recommend a suitable Video Generator/OSD IC that > can be driven from PIC. The STV5730A. See http://www.stv5730a.co.uk for details, datasheet, project board and demo code. This topic comes up regularly on this list and various other pic related resources exist on the web for this chip. Do a search on altvista or yahoo and the Piclist archive for "STV5730" and this should bring up at least two other sites with free code and hardware descriptions. > The other requirement is that the character set in the device must be > programmable from the micro as we mirror image the display at times and need > to mirror image text also. > The character sets for chips of this type generally are fixed in ROM. This is certainly the case for the STV5730A. Kayode ____________________________________________________________ Put your next PIC project on TV! http://www.stv5730a.co.uk

Thanks for the reply, The problem with the STV5730 is that the character set is pre-programmed in ROM. We need to choose and alternate character set which writes characters backwards for when we have the monitor in mirror mode. We also know of the UP6566 from NEC but are looking for video in-video out solution first. Do you know of any that would meet the requirements as in our original post ? Regards David Huisman

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 At 08:57 AM 6/8/00 +1000, David Huisman wrote: >Thanks for the reply, > > >The problem with the STV5730 is that the character set is pre-programmed in >ROM. We need to choose and alternate character set which writes characters >backwards for when we have the monitor in mirror mode. Sick idea, grab a raster line (digital or A/D) and output it backwards in hardware? Seems like there ought to be a way to do this with a long piece of unterminated coax, and a hybrid, but I think that's still FIFO, and you'd need LIFO. - -- Are you an ISP? Tired of spam? http://www.spamwhack.com A pre-emptive strike against spam! Where's Dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com> iQA/AwUBOT78HYFlGDz1l6VWEQL1hQCgiAmy0r3EQ8hsKp+xOnr/LM9ezDYAoI2o v9PPfMOQ3cYuBSY1E7IxWr0I =MZte -----END PGP SIGNATURE-----

David, The video reversal is already taken care of and is in use. We are now wanting to add text to the video (which we can also do without a problem). The problem is that when we reverse the monitor, the text also reverses. We can fix this be either using a chip that allows a custom character set that the PIC can write to Character Generation RAM (hence requirement for this type of device) or we can use a Character Generator (UP6566) that has character reversal facility but only outputs RGB, thus the second post for recommendations for a RGB -> Composite converter and Video mixer. The first solution is most appealing to us if such a device exists Regards David Huisman

Hi, If you already have video reversal done, is it possible to insert the text before it gets reversed? Andrew David Huisman wrote: {Quote hidden}> David, > > The video reversal is already taken care of and is in use. > > We are now wanting to add text to the video (which we can also do without a > problem). The problem is that when we reverse the monitor, the text also > reverses. > > We can fix this be either using a chip that allows a custom character set > that the PIC can write to Character Generation RAM (hence requirement for > this type of device) > or we can use a Character Generator (UP6566) that has character reversal > facility but only outputs RGB, thus the second post for recommendations for > a RGB -> Composite converter and Video mixer. > > The first solution is most appealing to us if such a device exists > > Regards > > David Huisman -- Andrew Thoms Software Engineer Fac Engineering University of Technology, Sydney No 1 Broadway, Broadway 2007 NSW, Australia

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >We are now wanting to add text to the video (which we can also do without a >problem). The problem is that when we reverse the monitor, the text also >reverses. That's what I was thinking about though.. The output of the chargen is just NTSC video lines. I was looking for an "outside the box" solution. Here's another part number to look at, STV5730A-1 Thompson Micro It's in a pic-driven video titler I am using for a microave video link. I would have rolled it myself, but too many projects already, and at $80, it was worth it. Intuitive Circuits makes it. Not a lot of glue, and it locks to the incoming NTSC very well, never had a hint that it wasn't steady. I don't know about the charset though, except I remember them talking about how they defined the font, so hopefully it's loadable, and that would do it for you. - -- Are you an ISP? Tired of spam? http://www.spamwhack.com A pre-emptive strike against spam! Where's Dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com> iQA/AwUBOT8IvoFlGDz1l6VWEQL0kwCghYKeljwTmYQAQjMtwo+1rKYKPDAAoMMY 5wK0DHtTqgELvpw7BLFMNiFN =9QrP -----END PGP SIGNATURE-----

David Huisman wrote: > We can fix this be either using a chip that allows a custom character set > that the PIC can write to Character Generation RAM (hence requirement for > this type of device) Taken from the STV5730 data sheet [snip] The user can redefine the total character set (except for the character 00H (zero)). [snip] Don't know how though. -- Best regards Tony http://www.picnpoke.com .....salesKILLspam.....picnpoke.com

Tony, Could you tell me which page of data sheet mentions that user can define character set ? It appears from block diagram that the character set is mask programmable (ie. if we buy several thousand ,they may be able to supply a version with 2 character sets (1 normal, 1 mirror image), we would rather use something that does the job already and do not require large volume orders). Regards David Huisman

David, This chip has a fixed ROM character generator built in only. This does not provide us a facility to mirror image the characters to suit the mirrored video image from our camera. Just to restate : Video from our camera comes in We add text to the video (OSD) Composite video out (text and video) goes to the monitor A control line on the monitor mirror images both text and video. When we set this control line, we want to mirror the text so it reads correctly. The STV5730 does not have mirror character facility or RAM based user changeable character set that we can modify. In all other respects (Video in, OSD, composite video out ... it is great). A chip from NEC UP6566 does have a mirror function for text but only provides RGB output and does not genlock to incoming video, thus we need to add 1) Sync separator (LM1881 is fine) 2) RBG -> Composite converter (Don't know of source) 3) Video mixer (maybe simple video opamp) So.. a recommendation for RGB to Composite IC and Video mixer IC would provide solution. Alternately, A chip like STV5730 with character reverse or user defined character set would work. Regards David Huisman

David Huisman wrote: > > Tony, > > Could you tell me which page of data sheet mentions that user can define > character set ? It appears from block diagram that the character set is mask > programmable (ie. if we buy several thousand ,they may be able to supply a > version with 2 character sets (1 normal, 1 mirror image), we would rather > use something that does the job already and do not require large volume > orders). > > Regards > > David Huisman Top of page Pg 18 of the data sheet I have. It is the page that shows how the characters are defined. It is also mentioned on Pg 7 under Functional Description. I cannot find out how this is made possible though. -- Best regards Tony http://www.picnpoke.com EraseMEsalesspam_OUTTakeThisOuTpicnpoke.com

> > The other requirement is that the character set in the device must be > programmable from the micro as we mirror image the display at times and need > to mirror image text also. > Can you mirror image your display by reversing the connections to the horizontal deflection winding on the yoke of your monitor? Bob Ammerman RAm Systems (high performance, high function, low level software)

At 11:07 8.6.2000 +1000, you wrote: >1) Sync separator (LM1881 is fine) >2) RBG -> Composite converter (Don't know of source) >3) Video mixer (maybe simple video opamp) Once, I did something similar. I used Elantec EL4583C as a sync separator (way better than LM1881), EL4585C genlock chip and AD725 RGB -> PAL/NTSC encoder. As a video mixer, I used AD8180. Nice thing is, that you can get both AD chips as a samples. Best regards PavelK ************************************************************************** * Pavel KorenskyÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ * * DATOR3 LAN Services spol. s r.o.ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ * * Styblova 13, 140 00, Prague 4, Czech Republic ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ * *ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ * * PGP Key fingerprint:Ê F3 E1 AE BC 34 18 CB A6Ê CC D0 DA 9E 79 03 41 D4 * *ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ * * SUMMA SCIENTIA - NIHIL SCIREÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊ * **************************************************************************