Subject:
Re: CUMP and programmers for Linux
From:
"James Newton's Massmind" ####@####.####
Date:
1 Jan 2002 21:15:57 -0000
Message-Id: <000101c19309$2d91c080$2413d8d8@main>
Carlos, are you willing to share your idea for setting / reading any voltage on any pin?
I've been trying to figure that one out for a while now and I know how it is done on large test systems... bunch of i2c DACs and op amps.
I also have an idea, but it still costs more than what the CUMP needs.... it would fine for a daughter board. My idea is to use multiple small microcontrollers and 'float' them up to voltages higher than 5volts by raising thier grounds above ground. If you needed gnd, nc, 5v, and 12v on the pins you would need two uPs: one for the gnd and 5v, and the second 'jacked' up to 12v. If one of the pins from the 12v uP is connected to the pin that needs to be at gnd or 5v, then it gets tri-stated.
I don't know if that will work, but I'm not a hardware guy...
So... What is your idea?
James Newton (webmaster, former Admin #3)
####@####.####
1-619-652-0593
Carlos Nieves Onega wrote on 01-11-14 13:36:
Hi all,
Well, I think CUMP is a nice project. It started with the wishlist of the community, so it has all people expects from something like that.
I'm doing something simpler, but a bit more flexible, and which is not by its own an stand-alone programmer, but it could be, adding the right hardware to control it.
I think, like Alessandro, that you have to approach the design of such a thing with layers. I'm doing the bottom layer of a programmer, and if you want a stand alone programmer, it could be the next layer, but the bottom should be designed to be used both with a PC and with stand-alone hardware.
I think I have solved the low-level hardware of a programmer. It allows you to control each pin of a 48 pin (or less, if you want) socket independently, with programmable sources, from 1.4 to 25V, and read the voltage at any pin you want. It is controlled with a serial port, with text commands, so it can be controlled by any terminal (idea from the CUMP and other programmers). It doesn't need an adapter for every device family you want to program, well, at least, if it has a dual in line package... and an adapter for any other device can be easily done, since you can control any pin of the socket.
With that, I think you will be able to program anything, even new low-voltage devices, using 3.3V or even less, and of course, use it for any other thing, like a function generator, or an analyzer, but I'm not sure what speed you could expect for that.
I have finished the design, and I have to start testing it, and program the firmware, so I have nothing working yet.
Get it working will take some time, but keep in mind that if you can keep it simple and modular, like Alessandro says, you could build an extremely good programmer. This is the low-level hardware, and could be used by whataever you want.
The software to control all programmers should be build also in simple layers, so if any change you want to do could be easily done. If not, your software will require some rewriting in some time. All of you are thinking of porting some existing programmer you know well, like Ic-prog, because that is what you want to get. Well, that's right, but I will take a look at some other ways to do that, like the one proposed by James Newton, the Engine (the webpage can be found on www.piclist.org ). It seems a good way to have an independent layer to program any devices, and which could be easily programmed for each new device. This could be used by the layer regarding the programming protocols.
I don't know if all these mails regarding the programmer and the software could be annoying other people in the list (not me). James have already suggested to open a new one, or use the CUMP mailing list, so maybe it's the time to reopen it...
Regards,
Carlos
P.D. If anyone knows of a device requiring more than a supply voltage and a programming voltage to program it, please, let me know.
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