5 Dec
2008
5 Dec
'08
1:53 p.m.
On Fri, 5 Dec 2008, Jim Brain wrote:
Roy J. Tellason wrote:
Not to weigh in on one side or the other, but I have prewritten routines
in AVR C that will scan up to a 16x8 matrix and output PS/2 codes. In
the other direction, I have prewrriten routines to accept incoming PS/2
data and output either RS232 or parallel ASCII codes, with support to
trigger an IRQ on keypress. My code runs on an ATMEGA8, which is a 28
.300" DIP unit or a ATMEGA16/32, which is a 40 pin .600 DIP.
This made me start wondering about going a couple steps farther. Consider
a replacement board for the controller found in a Model M keyboard which
is a drop-in replacement that turns the thing into a USB keyboard.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
Why
bother? AVRs and PICs are cheap and easy to work with (in
particular, an AVR with SPI can be programmed with little more than a
parallel port and a handful of resistors). Code for handling AT-
style keyboards abounds. One DIP--that's all that it takes.
Because I don't know a darn thing about any of that current stuff?
This was only a couple or three logic parts, from what I can remember, not
all that much...