data collection and storage.....
Bernd Felsche
bernie at innovative.iinet.net.au
Fri Sep 1 03:33:07 GMT 2000
Jorgen Karlsson tapped away at the keyboard with:
> > Thanks Steve...you make it sound so easy....I think I had to ask so many
> > questions here to make it that I had exhausted everyone , I cant design a
> > system like this but maybe I could do a little soldering.chip memory and
> > UART like you say sounds good.
> > Is there some ready made out there thats cheep and easy to use and good
> > quality....
> Almost, Espen check www.lawicel.com (in Swedish), they have made a
> 'simstick' for Atmel 40pin devices, the AT90S/LS8535 has a 512byte
> 512byte RAM and the 8kbyte Flash memory for the code. You can even
> get a finished unit from Lawicel with everything it is 330kr($35).
> Note that the Simm100 can be used as a standalone unit or in the
> simmstick bus.
The bus option allows you to solder a SIMM socket onto your own
board so that you can roll your own signal protection and
conditioning. GarNfarkle has written reams of stuff on protection
circuitry, and Steve (IIRC) has recently posted some stuff on opto-
isolation.
The simmstick is a good building block (IMHO), but you'll still have
to put a roof over it, and lay down some carpet. :-)
See http://www.simmstick.com/ for more information on the
architecture.
> The fine thing about the Atmel's is that you won't need to get
> anything exept the chip and board, programming is done with a
> passive LPT programmer, only three resistors, they are even
> optional! Bascom AVR is availabel in a demo version that is only
> limited to 2kbyte code. It has functions for everyting from the ad
> conversions, eeprom memory communication, serial communication and
> lcd output.
Depending on the number of samples you're taking, you will probably
have to write data to off-chip storage from the 8535 ... one of the
reasons why I asked about writing to CF a while back. (It's not
staright-forward - even using a parallel-port widget designed for a
PC.)
The 8535 is unable to directly address external storage as it has no
external address bus. However, the SPI can be used to talk directly
to serial flash-type storage chips - though development of such a
facility is perhaps beyond what you think are you limits.
If you want to have a look at what's involved, then see Atmel's
application note AVR335 "Digital Sound Recorder ..." (at
http://www.atmel.com) for a prototype example of how to store and
read back data from a serial flash using Atmel's 8-bit RISC. Most
of the 'hard work' is in the programming. (Example software is on
Atmel's web site as well, referenced to the application note.)
> For you guys who can't understand Swedish I suggest that you get
> the stuff from www.dontronics.com, you can also find information
> about bascom AVR there and i think that you even can download the
> demo version. They also have a shematic for making the passive
> programming cable.
> http://www.dontronics.com/runavr.html Programing cable.
> http://www.dontronics.com/basc-avr.html Basic compiler.
> http://www.dontronics.com/simm100.html Good picture of the finnished unit
> and a schematic.
> Jorgen Karlsson
> Gothenburg, Sweden
Don (of Dontronics) seems like a good bloke from my experience.
--
Bernd Felsche - Innovative Reckoning
Perth, Western Australia
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