gnupic: Re: PIC Emulator...
Subject:
Re: PIC Emulator...
From:
Matthew Bowles ####@####.####
Date:
1 Mar 2000 22:59:37 -0000
Message-Id: <38BD9F24.3959C53C@dsp.com.au>
Glad I could stimulate some discussion; funny though, how what seems
trivial to me (having not thought in depth about the problem) is now
generating idea's that go way over my head - for the moment.
I only realised last night, even if we could gain control of the
parallel ports pins, and force them bi-directional, we still 10-15 pins
short on the 40pin devices.
Oops, i take back the statement... 'can't get easier than tying wires to
your port and hardware connectors' - there has to be something in the
middle..like the XC9532.
can we start with trying to get a, maybe an 18 pin 16c71 going.
and a theory, and just a theory, on pins. Could we solve it with
something less H/W orientated by using a PIC16F84/C84 to read control
words from a gpsim module, that knows how to drive the emulating pins.
or we could use a 16c74, for the extra I/o and even contemplate driving
the A/D ports. perhaps i'm dreaming without thinking again..
As for the control words, we make them generic, like put pin 5 high,
regardless of what pin 5 is. this way we don't need to allow for
different processors, the decision on what pins should be available is
left to the gpemu module. This also removes the nesseccity for a
re-programmable emulator control device.
This is my thoughts, pick them to pieces.
matt
