At 06:04 PM 2/6/2003 -0600, you wrote:
>None that I've edver found. I have, however, written several applications
>that "bit-bang" the parallel port to talk to SPI interfaces (this is how
>many AVR processors are prograamed in-circuit using software like PonyProg).
>Be aware that this technique requires an additional "kernel-level driver" in
>the NT-series of Windows products (NT/2000/XP) do to the protected nature of
>I/O on those operating systems. Windows 3.1/9x/Me do not require this
>software and you can fiddle with the parallel port pretty easily.

I don't think SPI slave is possible without some extra hardware, but
SPI master should be a simple matter of bit-banging to the port (through
whatever driver is required by the OS).

Note that *some* SPI devices don't allow you to indefinitely delay
between bits, so even a master may be a problem in some situations.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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