[Tinyos-devel] And another question about Msp430SpiNoDma

[Philip Levis]

On May 15, 2008, at 10:10 AM, Eric Decker wrote:

> In the code there is a define in the Msp430SpiNoDmaP.nc called  
> SPI_ATOMIC_SIZE.
> It is set to the value 2 and causes the no dma code to read two  
> bytes at a time.
>
> Why does it need to do this as opposed to reading 1 byte at a time?

Jonathan Hui did an in-depth evaluation of the tradeoffs and found 2  
to be the best value:

https://www.millennium.berkeley.edu/pipermail/tinyos-2.0wg/2005-October/001376.html

Phil