SX Video OSD Board - reset???
Brian Riley
Posts: 626
I just recieved Bean's OSD board from Parallax. We are planning to integrate it into a Amateur TV module payload for an upcoming ballloon launch. It works pretty slick and so small and simple. Way to go Bean! Several things, though:
(1) In the Bouncing Ball demo you take the Sout pin HIGH for 100 ms, On the other hand, in the DS1307 Demo you simply say OUTPUT Sout. And then in DEMO, you don't do anything specific. What is going on here?
(2) the sending of "v_Null" (code 128) why/when is this necessary? In the straight video card setup you send four of them, in the OSD you send two of them.
(3) and speaking of the various OSD demos, I cannot find them for download anywhere. I took the "bouncing ball" demo for the straight video/sound card and edited it to the OSD, the chnages were minimal. In the process of gettiing the hang of this neat crad I made some mods to the code and I have attached it here.
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cheers ... brian riley, n1bq, underhill center, vermont
(1) In the Bouncing Ball demo you take the Sout pin HIGH for 100 ms, On the other hand, in the DS1307 Demo you simply say OUTPUT Sout. And then in DEMO, you don't do anything specific. What is going on here?
(2) the sending of "v_Null" (code 128) why/when is this necessary? In the straight video card setup you send four of them, in the OSD you send two of them.
(3) and speaking of the various OSD demos, I cannot find them for download anywhere. I took the "bouncing ball" demo for the straight video/sound card and edited it to the OSD, the chnages were minimal. In the process of gettiing the hang of this neat crad I made some mods to the code and I have attached it here.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
cheers ... brian riley, n1bq, underhill center, vermont
Comments
Thanks for the kind words.
1) When the stamp first starts up the pins are floating as inputs. It's possible that the module will see some noise on the line and mistake it for data. Holding the line high at startup makes sure that the module is ready to receive data. If the PAUSE 100 is needed or not depends on the amount of noise on the line. I must admit that I should have been consistant though.
2) Again the Null is usually used at start because if the module see noise and reads it as a command such as GOTOXY, then the first two bytes you send will be interpreted as the X and Y parameters instead of what you meant. Sending a couple Nulls insures that the module is ready to accept commands (since the Nulls would be used as the parameters, and do nothing if received as commands).
3) All I can say is Ooops. I will get them on the website ASAP.
P.S. I'd love to see some video of the module in action·after the launch ! And feel free to send me a PM if you need any assistance.
Bean.
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"SX-Video·Module" Now available from Parallax for only $28.95
http://www.parallax.com/detail.asp?product_id=30012
"SX-Video OSD module" Now available from Parallax for only·$49.95
http://www.parallax.com/detail.asp?product_id=30015
Product web site: www.sxvm.com
"Wise men know when they're right. The wisest also·know when they're wrong."
Post Edited (Bean (Hitt Consulting)) : 3/6/2006 5:31:23 PM GMT