TV_Text -> PPDB

[Rsadeika]

I assume that the TV_Text.spin object is ready to go for the DEMO board, since I do not have a DEMO board but a PPDB, I am trying to figure out what wires go to what pins. The first thing that I tried was p12-Vo, p13-V1, p14-V2, and p15-VA, this got me nowhere. Anybody get the TV_Text working with the PPDB, and is willing to share the secret?


<edit> @jazzed, I tried the tv_text.c, and tv_test.c, when I compile I get the following:
tv_text.c, error, _main not defined
tv_test.c, error, _tvText_start symbol not defined
So, I did not even get to the point of trying to change your program to match the pins to what I have hooked up. <edit>

Thanks

Ray

Post Edited (Rsadeika) : 9/20/2008 9:38:51 PM GMT

[Oldbitcollector (Jeff)]

Sure! Got one in front of me!

Try this:

Propeller P12 to V0
Propeller P13 to V1
Propeller P14 to V2

OBC

Edit: Make sure that you are looking at the correct pin for P12, it can be a little
tricky to see it right. If you are not sure, count'em out from P0

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[Rsadeika]

Just to make sure I got it right with my TV set, I have three holes on the front, yellow, white, and red. I just plug into the yellow hole, which reads video, correct? I have not worked with kind of set-up, just been plugging into VGA ports.

Thanks

[potatohead]

Yep, the yellow one is video.

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[Rsadeika]

I had no success with the TV, maybe the VGA. Does anybody have the pinout for the VGA adaptor for the PPDB, so I can try VGA_Text object. It would be nice if Parallax would have included the pinouts for the PPDB, so you could run the provided objects.

Thanks

Ray

[Paul Baker]

Hi Ray, if you prefer to work with VGA, VGA_Text and TV_Text are nearly symmetric drivers, meaning frequently all that needs to be done is replace one object with another, and make sure you have the right pin pointed to in the start method.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

[Oldbitcollector (Jeff)]

Here's the VGA hookup.. (Paul, you guys never did answer my question about why on this.)

V = P16
H = P17
B1 {240ohm} = P19
B0 {470ohm} = P18
G1 {240ohm} = P21
G0 {470ohm} = P20
R1 {240ohm} = P23
R0 {470ohm} = P22

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[Oldbitcollector (Jeff)]

Ray,

You said that you hadn't played with this setup before. Is there a chance you didn't find the
"line in" channel on your TV? That channel is typically located below channel 1 or has it's own
button on your remote or TV. Sometime referred to as "input"

Don't give up! TV access with the Propeller is pretty cool.

OBC

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[Rsadeika]

I am working with a KONKA TV, it has two sets of these plug-ins, one on the back, which I have my DVD player pluged into, and the other set on the front of the TV,·which I have connected to the PPDB. On my remote control I have to select AV1, to have the DVD work,·or AV2 for the PPDB. Maybe my TV AV2 is bad, but I have no idea as to how to test that. I sure as heck am not going to buy another TV just to see how my PPDB works.

As for the VGA connector, are you saying that I need to place a resistor between B1 and P19, for example. That is a real pain, you think that they would have added that to the board itself.

B1 {240ohm} = P19
B0 {470ohm} = P18
G1 {240ohm} = P21
G0 {470ohm} = P20
R1 {240ohm} = P23
R0 {470ohm} = P22

Thanks again

Ray

[Oldbitcollector (Jeff)]

Ray,

Those resistors are there. I grabbed a quick cut/paste from an earlier message as to
why they are laid out in the order they are. Notice how the lines criss-cross? :)

Just make the wire connections and you'll have VGA. Don't forget to load the VGA_Demo.

As for troubleshooting the TV, if the DVD player works on the rear hookup, try moving
it to the front jacks while it's on and see if you can make it work there. Or hook your
PPDB to the rear jacks and see it work. :)

OBC

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[potatohead]

Also, what are you running for the TV out?

If it were me, I would use the Parallax graphics demo. It's a good signal, simple to run, and known to display on pretty much everything. Could be your TV is picky.

This is where a quick photo would help too. (book suggestion OldBit! Lots of close up photos.)

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[Rsadeika]

I just checked both of the video ports on the TV, using OBCs suggestion, and they work. I tried a different cable, just to make sure that it was not the cable, both cables work. I also tried the TV_graphics demo, that did not work. So, there must be something going on with the PPDB itself, I hope nobody suggests using a scope on the TV module connections on the PPDB, don't have one, and if I did I would not know how to use the thing anyway. Any easy way to check the TV module on the PPDB?

Ray

[Paul Baker]

Oldbitcollector said...
Here's the VGA hookup.. (Paul, you guys never did answer my question about why on this.)

I don't have an answer to your question, I'll have to ask Chris on Monday.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

[Oldbitcollector (Jeff)]

@Paul, It's a little nit-picky, but I am really curious if there was a design consideration,
or if I finally caught someone sleeping. (doubtful) :) :)

OBC

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[Paul Baker]

The original design for the PPDB dates back to before the introduction of the Propeller, it is possible it was laid out before there was any concept of a standard and was never updated during the design process.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

Post Edited (Paul Baker (Parallax)) : 9/20/2008 9:33:46 PM GMT

[Rsadeika]

Well, I just tried the VGA_Text.spin object, and that did not work. I am having a heck of a time trying to get either one of these objects to work, I am starting to think that I may just have a bum board. I guess my next qustion is, has anybody got the VGA module to work on there PPDB? Their is probably no easy way to check the components on the board, so if tomorow·board does not work, then bye bye PPDB.

[Paul Baker]

I'll try it on Monday.

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

[Ron Sutcliffe]

I presume that you have the grounds connected OK ?

[Oldbitcollector (Jeff)]

I was able to run the VGA demo (the one with the button blocks) using the wiring scheme above.

@Ray, It's almost starting to sound like you might have a bum chip. Can you do a simple LED
blink? I've attached one below. Use a single wire from P0 to LED 0 and see if it works, then
work your way from P0 to P29 and see if it works. Just change the code and move the wire each time.

This will confirm your chip is working correctly.

OBC

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[Oldbitcollector (Jeff)]

Another thought, (and something that I will include in my book)

Make sure that your wires are in good shape. Frequent bending of solid core wire can
cause it to break, losing connection. You could have a wire that is broken, yet the
insulation is holding it together. Pass them with a meter or use the blink code to double
check any in doubt.

OBC

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New to the Propeller?

Getting started with a Propeller Protoboard?
Check out: Introduction to the Proboard & Propeller Cookbook 1.4
Updates to the Cookbook are now posted to: Propeller.warrantyvoid.us
Got an SD card connected? - PropDOS