AVR-Chat

Thank you Bruce!

That was IT (I think you mean SS though)!

It's amazing how... little things like this mess things up, and how lucky that you happened to look into this!

I still don't understand why it happens, as I enable the SPI port after a long delay (even tried 1s) so the voltage should be stable by then.
Should I have seen this from somewhere in the Datasheet?

Thanks again,

Cat

> To: AVR-Chat@yahoogroups.com
> From: obparham@jpl.nasa.gov
> Date: Mon, 15 Mar 2010 10:40:05 -0700
> Subject: Re: [AVR-Chat] Code stuck waiting for SPI transmission but only after power-up. (ATMega644P)
> 
> Hi Cat,
> 
> This may have already been asked and I missed it but, in your 
> initialization code, do you
> set the CS pin to OUTPUT before or after you enable the SPI port? If 
> it's done after, an
> initial low voltage on the pin may be forcing the SPI port into slave 
> mode as soon as it's
> enabled.
> 
> Bruce

 		 	   		  

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