RE: [avr-gcc-list] software spi master

[Larry Barello]

The SPI interface is very simple.  Look at the hardware description in the
AVR data sheet and I am sure you can make your own in a dozen or so line of
code.  Just assert the /SS line (if you use that) and clock out 8 bits while
sampling and clocking in 8 bits.  You could even rotate through one register
(R24) if you did it in assembly so calling the routine returns a value.
That is really all there is to it.

-----Original Message-----
From: Torsten Hahn

Am 19.02.2004 um 23:00 schrieb E. Weddington:

> On 19 Feb 2004 at 22:33, Torsten Hahn wrote:
>
>> Hi,
>>
>> can somebody give me a link or tip, how to implement an spi-master in
>> software with avr-gcc. There is an appnote (AVR320) for such a
>> software, but only in pure assembler ...
>>
>
> <http://hubbard.engr.scu.edu/avr/avrlib/>
>
>

Hmm ? It seems that there is only an example for using the hardware-spi
which is in most avr devices. But iam looking for a software
implementation ...

cu,
Torsten.



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