Originaly, this is a little project I came up because of the fact I did not own an MSO at the time.
I had put together a little hack with a microcontroller, and was able to display 4 or 8 traces on a standard
analog scope. Original project: oLogic Project
Since then I have had alot of traffic on my server, as well as people emailing me for a copy of the .hex file,
or if i can send them a preprogrammed chip.
I started thinking one day about the project, I never realy completed it. (still really havent 100%) But
I wanted to make a kit available online, or at the very least the PCB. So I came up with
www.picstuff.com as a place to put some parts and PCB's as related
to projects.
If you are interested in purchasing this as a kit, you can find it here on
Pic Stuff
So here is some more info on the updated project:
This project will allow you to view 4 or 8 logic channels on a standard analog scope.
You just need to hook up two scope connections;
CH1 connects to the output of the oLogic board
TRIGGER connects to any of the logic inputs you want to trigger off of.
To set the trigger to the correct chanel, an extra wire on the board connects to a header pin that matches
the input channel.
Thre are 2 trace modes, 4ch or 8ch mode. 4ch mode is a little cleaner and faster, since it only has to draw
4 lines in the same amount of time, thus higher freqency viewing is possible.
There is a jumper in the upper left hand side of the board for 4/8 ch mode.
Also, there is a Chop/Alt mode jumper. Chop mode is the standard mode to use the oLogic. Alt mode is
experimental, and uses a gate signal from the scope to tell oLogic when to draw the next trace. It is possible
to use an external source to trigger this. If you are in 4 ch. mode, you can jump a wire from the gate input
to channel 8, and use that chanel pigtail for gating.
But hey, feel free to modify and email me back, I will post your alt code update.
After all, this is an open source project.
Note:
For crystal selection, I have done well using a 24MHz with X4 PLL, thus 96MHz. Performed well for me.
