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Re: [avr-gcc-list] SPI comm on At90S8535

From: Mike Hoyt
Subject: Re: [avr-gcc-list] SPI comm on At90S8535
Date: Wed, 27 Nov 2002 12:17:27 -0500


Sounds like MISO is configured as an input. I've never used the SPI port in
slave mode, but according to the datasheet for the 8515 (I don't have the
8535 datasheet), MISO is user-defined in slave mode. Therefore, you'll have
to set the appropriate Data Direction bit to get MISO to function as an

Hope this helps,

On Tuesday 26 November 2002 19:11, Torsten Mohr wrote:
> Hi,
> just a stupid question, it must be something really
> simple:
> I have:
> turn LED on
> }
> I initialise:
> outp(0x00, SPDR);
> outp(0xeb, SPCR); // slave mode, Int enabled, LSB first
> sei();
> Now when i set SlaveSelect of the AVR to GND, MISO should be
> set to a valid level, right?
> It is hanging at 1.3 V though there is nothing connected to it.
> I assume my initialisation is not correct, is there
> something missing?  The interrupt is never called...
> Thanks for hints,
> Torsten.
> avr-gcc-list at http://avr1.org

avr-gcc-list at http://avr1.org

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