A little HELP!!

[Ramius]

Yes you are right! What I did wrong was try it with a video input signal! When you wrote "Blue Background" that was the key to not use a video input source. A video input source gives the rectangles in white only! Do you know if it can work with a video in source? Also how do I play with lines 6 and 7 to try and get a red red and not pink?

Thanks, Ed

[aerostar]

Data sheet says....

Mixed mode : the device is line locked to the
incoming CVBS signal. The text is superimposed
over the CVBS input either in B&W or translucent.
It may also be superimposed in color by using the
R/G/B outputs.

As it stands it switches to white characters on the incoming video.

I have not got a good red out of it, by playing with tint/color/contrast and brightness. If you did manage to get a decent red, that of course would impact on the color of the incoming video signals.

A black background MAY look better instead of blue, - the eye/brain can do funny things with colors.

[Ramius]

Thank you and does what you wrote mean we cannot have color characters over incoming video? Translucent should be fine if it has color.

[aerostar]

As far as I understand that data sheet statement, and of course I may be wrong, no colors over incoming video as well translucent unless you use RGB.

Never tried this, plain white was fine for what I used the chip for.

[Ramius]

That seems kind of strange to me. Any ideas as to how we can test this? Maybe something simple like assigning a color to "NTSC"?

[aerostar]

I have looked at the BOB4 from decade.net and it looks like their version only does white text on incoming video.

http://www.decadenet.com/bob4/bob4.html

I believe the STV chip was really designed for Menu setups on televisions etc, prior to digital sets, and does not to put color text overlays in incoming video, other chip maker versions also no colour, 1990-2000ish did the same, Maxim, Sanyo.

With digital sets it is now incorporated in a graphics chip onboard.


This is where you can change the character color, it will affect all characters using this routine, text and overlay.

DISPLAYCHAR:

WDATA = %0001010000000000 + STVCHAR

' 11 10 9 8 7654 3210
' WDATA = %0001 0 1 1 1 0000 0000 + STVCHAR

' bit 11 = character background 0 = disabled 1 = enabled

' bit 10 = red
' bit 09 = green
' bit 08 = blue

' 000 = black
' 001 = blue
' 010 = green
' 011 = cyan
' 100 = red
' 101 = magenta
' 110 = yellow
' 111 = white

[Ramius]

Again my biggest thanks. I will play with it as time permits. Yes I had looked at the BOB4 sometime ago and it was only white from what I remember.
Eagle Tree ( http://www.eagletreesystems.com/inde...product_id=136) does color text over video, however they would not share any information to customize their product for other purposes such as a sub. This is why I went back to the STV5730. I spent many hours and days searching for a chip to use with no success. Logically speaking, if you can add color text to a fixed color background then you had to generate the background color as well as the color text and "mix" them to produce video. RGB is kind of a strange animal as it can be RGB video and a separate sync or RGB with sync for each color (R-G-B). Maybe I was searching using the wrong search words and missed finding other chips?