Discussion in "8051 Discussion Forum" started by    kittmaster    Dec 4, 2007.
Tue Dec 04 2007, 08:52 PM
#1
I've been taking a hard look at the SV2000 serial to composite video which is very very easy to impliment. The problem is that it is only monochrome, limited font, and 9600 baud, which isn't to bad for string feedback.

I'm looking for something that could replace that using a similiar method. I would like it to be in color, programmable, and 256 color. I can't seem to find anything that is already integrated as a package IC that can be programmed serially. I don't need Svid or RBG, but wouldn't dismiss it either.

I don't want to reinvent the wheel or have to recode any of my modules to support it. I'm not doing graphics, but would like to be able to control fore and background of the CRT/LCD.

I've combed google and just came across this site. Anyone have a suggestion as to what direction or IC would do this job easily and effectively?

Thank you

Chris
Wed Dec 05 2007, 06:31 AM
#2
well i do not think there is any IC with such simple interface and has a PAL or NTSC o/p.
there are many typical ICs from phillips like SAA7120/21 etc for CRT interface.. with I2C interface.

While i was looking a solution for you i came across this website.. seems very helpful to me... http://www.micro-examples.com/public/microex-navig/doc/089-pic-pal-tv
This guy has made PAL video library for PIC microcontrollers. Why don't we try to modify it to be used for 8051? or.. make a PIC ic which can have this library on and interface it with an 8051 via UART... and make same kind of Command set for it?
because as such its hard to get IC with uart interface and give color o/p and in DIP package it seems impossible.
Wed Dec 05 2007, 01:27 PM
#3
Oh yeah......that looks exactly like what I want.

Based on what I see there, I don't mind having a dedicated (any) flashable 89C51 core solely dedicated to the video rendering section. I'll really hardcore look at that info right after typing this.

Porting it to C51 would be great since it is in C anyway, the piece is going to be a "module" connected via ribbon cable to my main processor which has other modules that are not connected to the serial buffer. So this dedicated video module would have direct access to the RXD TXD pins for incoming data, and then whatever it takes from the C51 to do something similar to what I saw as images there.

I have CNC PCB routers to create any given prototype we come up with and also the needed breadboard.

Thanks for the awesome linkage. I think once the framework for it is done, the buildup will go quicklyl.......:)

Where should we begin?

And thank you for taking the time to help me out....:)
Wed Dec 05 2007, 01:57 PM
#4
Just went through the entire site, the only thing i picked up that could be an issue is that there is no 75 ohms termination at the video out jack. Most other ladder network outputs usually have a 75 ohm resistor in parallel with the output for impedance matching.

Other than the PAL timing. The prototypes and array functions seem pretty straight forward. I won't need any of his functionality like the clock and calendar since i'll be useing a RTC in the main control which could just feed the datastream into the video generator and render it there. My primary concern is getting the hardware set up correctly and dealing with the software after.

Would you agree?

BTW I'm on EST > GMT -5

What is the best time for responses?
Wed Dec 05 2007, 02:04 PM
#5
so making a module will be a better idea.. but i do not have much idea about PIC microcontroller so if you can do that part.. i can just guide you
after the module is done.. we can have a standalone PIC controller with UART i/ps and TV output and anything can be interfaced with this.. standalone module... what do you say?

I think you can just start from testing the library.. how it is used and how can we interface CRT with PIC etc...
Wed Dec 05 2007, 03:04 PM
#6
I prefer not to use any PIC, I would rather port this over to 8051 code and pin assignment. I don't even own any pic IC's, but I have plenty of 8051 cores. Keeping in modular is a good idea, this way anyone with a serial port can just dump the data to the module and it will read out on CRT/LCD.

Its just trying to figure out how to set the hardware up for this. He is using two seperate ports on the pic and the hard part is getting from PAL to NTSC ??

Never had to play with NTSC before, so my issue is with the conversion process based on the timing algorithm
Wed Dec 05 2007, 06:07 PM
#7
well we need to read a lot i guess We can port it to 8051 once we understood the whole process.. how things work.. its going to be an addon for 8-bit baby

he has provided links at the bottom.. check them too... if you get any good info

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