TV Term Setup ?

[Areal Person]

Could someone look at my photo, I'm trying to
get the RCA TV feature working and it's not

Here's my layout. Pins 12,13 & 14
are going to the 1.1k, 560ohm &270

I'm not using p15

My sony TV is set to Video 1

Is it ok ?

-Areal

Post Edited (Areal Person) : 12/8/2006 2:26:25 AM GMT

[Mike Cook]

Where's your crystal?


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Mike

[James Long]

Mike,

Good call.....I've been following this progression in a different thread.....and didn't even think about the Crystal.



James L

[Areal Person]

Ok, I have installed the Crystal.

I tryed again, but it still will not work.

Is the Crystal required for VGA & TV Term ?

I thought is was only needed for serial communications ?

-Areal

[Mike Cook]

I believe it is required, never tried it with out one. Here's a link to the one I use, Parallax also sells crystal's

http://www.mouser.com/search/refine....=520-HCU500-20

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Mike

[James Long]

The crystal is required any time the chip is going to run.....it is required.



James L

[Mike Cook]

I would also connect pins 32 VDD (+3.3), and pin 29 VSS (Ground)

Also make sure you have defined the PINs·for tv_text, below is an example from one of my *.spin programs:

OBJ
  term          : "tv_text"                             ' Define NTSC TV output routine
 
 
PUB main 
  term.start(12)                                        ' start TV terminal on pins 12 to 15

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Mike

Post Edited (Mike Cook) : 12/8/2006 2:57:27 AM GMT

[Areal Person]

Ok, I did all that you suggested, I connected pins 32 VDD (+3.3), and pin 29 VSS (Ground)
I installed the Crystal, and double checked everything.

it still will not work.

I'm using the example program thats provided with
the propeller tool download, it's called TV_TEXT_DEMO.SPIN
and it looks like this.

----------------------
CON

_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000


OBJ

text : "tv_text"


PUB start | i

'start term
text.start(12)
text.str(string(13," TV Text Demo...",13,13,$C,5," OBJ and VAR require only 2.8KB ",$C,1))
repeat 14
text.out(" ")
repeat i from $0E to $FF
text.out(i)
text.str(string($C,6," Uses internal ROM font ",$C,2))
repeat
text.str(string($A,16,$B,12))
text.hex(i++, 8)

[Mike Cook]

In the Propeller Tool, go to File>Archive>Project+Propeller Tool. Attach that file and I'll run it on my demo board.

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Mike

[Areal Person]

Ok, here is the file.

[Mike Cook]

Well that works on my board, so..

1. Did you purhase your crystal from Parallax or somewhere else it should be a 5.0 MHZ 20pF

2. Might be a bad chip

I'm assuming when you say: "it still will not work." means the Propeller Tool will Identify the chip and then download the program when you press F10, but your not getting any vidio output.

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Mike

[Areal Person]

Yes, your correct. I did get the crystal from Parallax.

The Propeller Tool will Identify the chip and then download the program when I press F10, but I'm not getting any vidio output.

If you think my wiring is ok based on what you saw, and all, then I guess
it must be a bad chip.

I have another oprdered, it should be in next week. I'll try that.

I really want to thank you and everyone else who has helped me.
It's been frustrating because, I'm new to electronics, and well, I guess I must
have done somthing to damage the chip.

Thanks again !
-Areal

[Mike Cook]

Nothing else jumps out at me from your picure, only thing else to try is to shorten some of your wiring on the three resistors and make sure the video display you are using will display a composite video signal.

<EDIT>

Here's a LONG shot...

If your resistors were shipped with tape on both ends, trim .25" off of each end. The stickey stuff on the 'tape and real' packaging can sometimes cause you problems.

</EDIT>

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Mike

Post Edited (Mike Cook) : 12/8/2006 3:44:22 AM GMT

[Harrison.]

How did you plug the crystal in? If you used wires then try hooking it straight into the breadboard by propeller pins. (Make sure you are using pins 30 and 31 for the crystal).

I had a problem with video, took about 10 minutes before I figured out that the crystal wasn't oscillating.

Harrison

[James Long]

Areal,

I do have one ohter suggestion.....although I doubt it works. Place a .1uF capacitor between VDD and VSS right at the Propeller. There maybe a little noise that is causing problems. I doubt it.....the way you have it setup....I don't see how.....but we might as well cover all the bases.

James L

[James Long]

What about the EEprom????

I don't see it on the board......



Areal....so you have an eeprom on the board?

If not...it is needed. The prop loads it's software from the eeprom....I don't know if you can run one without it.



James L

[Mike Cook]

EEPROM is only needed if you want to 'boot up' with out having to load the program with the Propeller Tool, F10 downloads the program directly to the Propeller's RAM.

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Mike

[James Long]

I don't really know.....since I never run the Propeller that way.....just a thought.

EDITED::::

No the EEprom is not needed....so you are right Mike.....sorry Areal....my mistake.

James L

Post Edited (James Long) : 12/8/2006 4:03:37 AM GMT

[Areal Person]

Sob... sob...

I've been working on this around the clock for 3 days.

I've tryed 5-6 completly different setups, breadboard, soldered pref board.
Different resistor sets, different monitors, cables. ua...

everything, except changing the Propeller chip, I'm going to try that
soon as it arives in the mail, I'm also going to try the .1uf cap between VDD and VSS
as james suguested.

I think it just has to be the chip, it simply cant be this hard to hook this stuff
up ? I dont know how the chip got damaged.

I'm really scared that when I try a different propeller chip that it will not work.
But that simply cannot be possiable, I know that, I'm trying to tell myself that
so I don't get depressed.

The wiring diagram is just to simple for this not to work.

Thanks so very very much to everyone,
This is a really cool forum !

-Areal

[James Long]

Areal,

I'm sorry it is being so frustrating......I have that happen at time....but you will feel much better when you prevail.

Just keep trying new things....something will work.

Sorry we couldn't find the problem.......maybe the new chip will be the fix.

James L