Re: SPI problem

David VanHorn <[email protected]> Tue, 13 Jan 2004 16:52:43 -0500
Newsgroups gmane.comp.hardware.avr.general
Message-ID <[email protected]>
>
>Does setting PORTB to 0x24 help? I see this in the datasheet:

Not by itself.

>  PB2 -> SS*
>  PB3 -> MOSI
>  PB4 -> MISO
>  PB5 -> SCK
>
>Also, you might want to set PB2 high. 

Tried PORTB=0x26, also no go.


>Might also consider clearing DDRB4 in DDRB since it's an input.

DDRB is 0xEF, that's 11101111b which has that pin cleared (input)
Right?


>I assume you tried simple SPI output in a real device already and it works. 

Not recently, I don't have real hardware for this one yet. 


>I've had best results if I make sure that the SPI bits of DDRB
>and PORTB are the same.

Tried it, no go.


I'm using the studio 4.08 sim, AFAIK it's the latest update.