Message-Id: 14104_ha5kfu
From: ha5bwh@ha5kfu.#bp.hun.euro (Istvan, Retaller)
To: piclist@mitvma.mit.edu

>Tom Handley wrote:

>>

>>    Ints, I have'nt put it on my web site yet as I'm still working on it. Whil
e

>> I've finalized the design, it's going to take awhile to generate documentatio
n.

>>

>>    What I'm doing is providing a hardware design for a logic analyzer. I woul
d

>> like to see a group-effort to develop the PIC and PC software. There are a lo
t

>> of ways to package the hardware and write the software. I'm leaving that up t
o

>> members of this group. While I'll be participating in this I want to encourag
e

>> others to share in the software design. This should be educational while

>> providing a relative low-cost tool for development.

>

>I'd love to help.  I've been obsessed with building low-cost test

>equipment for the hobbyist/student for a while now.  I have a number of

>ideas for various pieces of equipment (since I've been interested in

>PICs, I've been wanting to make an integrateable design, an all-in-one

>box solution that performs many functions).  Two of the most

>unattainable devices, however, are scopes and analyzers, due to cost.

>

>I have experience in C++, x86 ASM and 6811.  I also have experience in

>instrumentation (all courses at school), digital/analog design and I

>have just started an extracurricular effort with PICs.

>

>What needs to be done?  What has been done?  Is there a web page for

>project organization?  If not I have necessary resources and knowledge

>for web-based project organization (server space, CGI, etc..).

>

>James Oakley

>



Hi, boys, I have also considered to build a logic analyzer and I have

built some hardware for it. It was based on TI's 74ACT8994 digital bus

monitor. The device was developed as an axuliary circuit for boundary

scan concept.

It has 16 input lines, 50Msamples/sec, 3 different trigger words (of

course, maskable) and can be considered as a ready-to-use logical

analizer.  Consider a 2 by 2 inches analyzer with thes features.

I built it into a hardware lock's house with DB25 connectors on both

 sides.

On of them is used to connect to PC via RS232, the other one is for

the test clips.

The board has a PIC16c57 to communicate with the PC and to translate

the commands coming from PC into appropriate boundary scan surface

controlling actions. This point I'm at is studying how to handle the

device via the boundary scan bus.

If you feel this is the direction, I'm ready to share details. There

is nothing written for the PC, I control the board via a terminal

program.

Don't worry, still there is a lot of work to do...



                                       Istvan