RE: Robostix: Quadrature Encoder Counters

It has counter/timers although that may not be the way to go.  It also has a
lot of direct access registers and plenty of memory.

If you are planning to program the ATmega128, you should be looking at
WinAVR - a library of prewritten functions for the Atmel line including the
128.

You can use Atmel's AVR Studio 4 and WinAVR for all of the code development
and you will be using the full C language with the GNU C compiler - comes
with WinAVR.

Oh, and the library has code for a quadrature encoder.  I haven't used it
but I just looked to see if it was there.

I HIGHLY recommend WinAVR even if you just use it for hints.  Total software
cost $0.


-----Original Message-----
From: gumstix-users-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:gumstix-users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Brendan
Simon
Sent: Wednesday, July 13, 2005 11:30 PM
To: gumstix-users@xxxxxxxxxxxxxxxxxxxxx
Subject: [Norton AntiSpam] [Gumstix-users] Robostix: Quadrature Encoder
Counters

Dear Robostix gurus,

Does anyone know if the Atmega128 has up/down counters in it?
I'm thinking of attaching some quadrature encoder devices that outputs
up/down pulses (or clk/dir signals) to it, but that depends on whether
the device has internal up/down counters .

If not, then I can interface an quadrature encoder counter that has a
cpu interface.  Unfortunately this is a bigger device and would also
require the appropriate addr/data gating due to the multiplexed
addr/data bus.  Also I don't believe the Atmega has chipselects like
other microcontrollers so I would also have to decode the address bus.
All this is not drastically difficult, it is just that I am prototyping
with standard dip components (not SMD) on a very small piece of vero
board.  Just trying to save space and time :)

Also, are the 8 pads on the bottom of the board the 8 bit addr/data lines ??

Thanks for any info,
Cheers,
Brendan Simon.




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