PAL TV Demo for simple data viewing whilst evaluating Propeller Chip

Dr Bulb

·Hello
······· Here is a simple PAL TV data output program and is for newbies like me to the propeller chip, to get up and running quickly with·cheapest video output device. Ideal for following PE_Labs_Funbook-v1.1 to cut our teeth and have to use PAL instead of NTSC. I must give credit to Rayman for his PSM_TvBmpViewer which I hacked about a bit to get this done. His comments in his code where a great help in doing this and getting the stripped down version of his code working with TV.spin. I hope this is useful to other people as is the spirit of this forum. Any comments or observations are welcome. Now back to PE_Labs_Funbook a great intro to Propeller world. See attached Zip file for the program and a screenshot of the code running and a photo of my Veroboard protptype.

·PS I don't have the moire fringe patternation shown on the tv video output photo attached, that is interaction between tv and·ccd camera on my phone.

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It began with a closed deserted diner and a man too tired to debug his Z80 code any longer.

Post Edited (Dr Bulb) : 1/14/2010 11:58:56 PM GMT

Mike_GTN

Hi Dr Bulb,

Your Veroboard layout looks very good, might be some space to experiment with VGA output from the Propeller.
Your TV is kidding you (with internal circuits that is A good PAL signal) If you have an older Television with A video
Input try that and report back please.

With regards

Mike.

http://en.wikipedia.org/wiki/Walter_Bruch

Dr Bulb

· Hi Mike
··········· Thanks for your feedback, yes I guess you are probably correct about my TV kidding me, I have looked at some of the discussions on here regarding Generating PAL colour bars and obviously the signal from the prop is I suspect not up to broadcast standard. I have had a quick scope of the signal but have not really studied it or looked closely at the 4.433mhz colour burst. Lets call this the quick and dirty VDU, that was all I wanted to get on with experimenting with the Prop quickly and it fulfills that purpose and I have to say how many other microcontrollers can do that and still have 7 Processors spare? We both know what a top quality colour bar generator would cost and I don't think Chip Gracey was aiming at that with VGA available on the Prop, but as far as I am concerned this chip is brilliant. I don't have an old TV more the pity it would have been nice to have tried this on and old UK 405/625 set · I am glad you liked my prototype and yes I am looking forward to getting vga output, just waiting for some female .1 headers to arrive for the Prop outputs, then the breadboard is coming out. Just getting my head around this chip after moving from Z80A to PIC to PROP and want to use it for signal generation/control for electronic music and electric guitar. Have some nice filter chips and vca chips waiting in the wings.

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It began with a closed deserted diner and a man too tired to debug his Z80 code any longer.

Mike_GTN

Hi Dr Bulb,

Yes I do also also suspect some liberties have been taken with regard to the real UK PAL specification that I would have liked. Let the end users Television do all the heavy lifting. I really must stop all my crying in to my soup. Chip did an amazing job to even hit half of the available worldwide PAL standards. Wonder who will write A SECAM driver? that could almost become the next Standard.....

Viewed through 405 lines, the world seems crystal clear, but is Black & White. I shall chuck in A few more valves and take another look later.

I hope that you will also find the VGA output from the Propeller to be 101%, is simply PERFECT and even beyond my manic grumblings! Is nice to see that you have left some space to build the 8 resistor DAC to sample some of the delights that VGA on the Propeller will offer you. Your Music project sounds interesting, will you be using CMS chips for this?

With regards

Mike.

Dr Bulb

·Hi Mike

········· Yeah a few more valves and a colour ink cartridge might help wondered why I could never find a 4.433mhz crystal in those sets. The vga sounds very good will do as you say and try it when I get time. The basic idea I have for music is prop as sequencer, for the Elektor Formant synthesiser I built in the 70s showing my age now. When I get my hands on some vca and vcf chips I will try those with the prop, early days yet as I have to crack spin and assembler first so time to roll up the sleeves.

Regards

········· Alan





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It began with a closed deserted diner and a man too tired to debug his Z80 code any longer.