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R: Re: [avr-libc-dev] XMEGA hardware CRC calculation


From: address@hidden
Subject: R: Re: [avr-libc-dev] XMEGA hardware CRC calculation
Date: Wed, 20 Oct 2010 11:44:19 +0200 (CEST)

>>  If it *is* the speed of reading flash, I>> would be, well, surprised.  
>> After all, you *run* from that flash, right?
> Not exactly in the case of the XMega.>The XMega has a separate memory 
> controller for the different> categories of memories to access read or write 
> from them, which is> different than running from Flash.
Well, simply, if you want to read bytes from flash to use them in your 
programyou have to use ELPM instruction and then instruct the NVM controller to 
readthe flash for you that is completely different than fetching instruction 
for programexecution by the CPU itself.
By the way: have you tried the code i posted a few days ago, Bob?I'm interested 
in your comments about that strange CRC.



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