Re: [ECOS] Will ECOS run on an ATMEL AT91SAM7A3 controller ?

[Andrew Lunn <andrew at lunn dot ch>]

On Fri, Jan 27, 2006 at 10:31:14AM +0100, Martijn Hazenberg [GOVA] wrote:
> Hi,
> 
> A simple question :
> Will ECOS run on an ATMEL AT91SAM7A3 controller ?
> It has 256 kbyte flash, and 32 kbyte sram. It's capable of running at 60 
> mhz.
> It will be used for a motor controller with dual can bus. No need for any 
> special rich os features.

Im currently working on the ports to the AT91SAM7SXXX. These have
similar memory sizes. I have a AT91SAMS764. This has 16Kbytes SRAM and
64 Kbytes FLASH. I have to change the stack sizes in order to get
things to fit, but i have got some of the eCos test programs to fit in
this RAM/FLASH. Others are just too big. Generally programs with lots
of threads have problems becasue of there stacks. If you can keep the
number of threads low and tune your stack sizes you should be able to
get a minimal eCos system running. I've no experiance with CAN though,
so i don't know how big the CAN bus drivers and stack is.

I just had a 30 second look at the AT91SAM7A3. It looks very similar
to the AT91SAM7SXXX so i don't think a port will be too hard.

        Andrew

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