Re: [avr-gcc-list] AVR DataFlash

[Rolf Ebert]

> I've been gathering some information on AVR butterfly's dataflash  
> (AT45DB041B). It looks like there are several read and write commands:  
> main memory page read/write, buffer read/write, etc. Has anyone tried to  
> use these commands before? Are there any examples available online? How  
> can I write a C code to read from the buffers? Or write data to the main  
> memory? One more question: Can I determine how expensive dataflash  
> read/write operations? Thank you for your help!

Get the data sheet from Atmel and then have a look at the Butterfly's  
sample code itself, mainly dataflash.h.  Essentially you have to first  
write your data into one of the RAM buffers and then you can copy the  
buffer to a given page.  Reading is the other way round, you first copy a  
page into the RAM buffer and then you can read from the buffer.  The  
sample Butterfly code does a continuous stream reading without using the  
RAM buffer.

Sorry, my code isn't C, but Ada.

   Rolf