A little HELP!!

[aerostar]

Here is code, hex file and other files made by PBP3 , Microchip assembler, tested working with my NTSC source.

I used a second STV NTSC board as the video source (top board in picture) , connected that output to the input of the original board board (bottom board in picture), and it switches back and forth OK.

Top BNC is video input, bottom BNC is video output on the boards. Micros are 628a pics

With no input to the bottom board, you see the NTSC. and the No synchs message, with NTSC input from the top board, bottom BNC, NTSC. is overlayed on the incoming video, my top board board puts out NTSC VIDEO SOURCE.

Compiled (with help of friend) PBP 3.1.0.1, mplab 8.92 MCS version 5.00.5 and programmed with pickit 2 v2.61 programmer. this I think matches your software setup - your programmer unknown.

[Ramius]

WOW! That really looks really great! Thank you for the files too! My programmer is a PICSTART PLUS and that should not make any difference. Two questions, how did you wire your STV5730A? Second question, have you tried to have the text be a color? Again, what a great job!!!

Ed

[aerostar]

WOW! That really looks really great! Thank you for the files too! My programmer is a PICSTART PLUS and that should not make any difference. Two questions, how did you wire your STV5730A? Second question, have you tried to have the text be a color? Again, what a great job!!!

Ed

And to prove it really does work - see below - wobbly camera as it was my phone and had to have the other hand to make the connection to the top board at the same time.



Part of the PCB lay out was on the net way back 2003 or earlier, done with the free version of Protel as was then, I modified it to fit what I wanted and had the boards made as it was a commercial job. The text was only used as white but should be able to change using the color register I think.

If I get chance I will see if I still have the board layout - it will take a day or more - have to dig in to old backups etc and when I get the time.

[Ramius]

It looks really great! Fantastic job! Just the schematic would be fine, just want to check the values of the components used for the STV5730A.

Best, Ed

[aerostar]

From the depths of the old files I found this -




On the STV PDF, it shows Circuitry around pins 5 and 6 I incorporated this, but I see the schematic above does not, I think as long as you have a good smoothed 5 volt power supply with good decoupling caps, there should not be a problem. However he does not show decoupling caps on his 9-12V DC circuit, 100N/220N should be in parallel with his 47uF caps and be close to the regulator.

On my board R3 (3k3) not fitted, My board, and the program you have uses CSYNC to work out the switching of modes, from what I remember I found odd problems using the MUTE, but cannot remember exactly what ! I think it did not always change the level when it should have or took a while to change.

Different coloured characters, It is in
DISPLAYCHAR:

WDATA = %0001011100000000 + STVCHAR

Bits 10,9, and 8 internal ram buffer, page 7 of my PDF, according to the STV data control the colour of the character.

You will have to try that when you get your system running correctly

[Ramius]

Again my greatest thanks! I just received three new STV5730A's so I will build the boards with the same component values you are using. Again, Thank you!

[aerostar]

Out of interest what supplier are you using to get the chips and what price ?

The schematic is not mine - it was used as a guide, however the values of resistors etc are the same, and what is used in the STV pdf.

[Ramius]

Hi Aerostar!
Just wanted to update everyone on the progress! The schematic was a big help! I had used a different schematic and had character timing problems. One line would be shifted left and the next line was 1 pixel right! Now the text is perfect thanks to you! Again I appreciate everything you have done. You are the best!

Sincerely, Ed

[Ramius]

Hi!
Not sure if anyone is still watching this thread and I would love to ask a few more questions if it would be okay?

Thanks, Ed