Andrew Kalman wrote:
Hi All.
For those of you not familiar with the Salvo RTOS, it's an RTOS with
an especially small RAM footprint that is well-suited to the MSP430.
Pumpkin has certified the Archelon / Quadravox, IAR, ImageCraft and
Rowley Associates compilers for use with Salvo.
We've been asked to do an mspgcc port. One thing we would need (and I
couldn't find in the documentation) is a __monitor__ keyword (all 4 of
the abovenamed compilers support this). When applied to a function
like this:
void MyFn (args) __monitor__
{
...
}
the net result is that the very first two instructions in the function
are:
push SR
dint
and the very last instruction is
reti
i.e. the function saves the GIE status upon entry, and restores it
upon exit.
Since this will affect a function's stack frame, this is something
that must be supported natively in the compiler, and cannot be done
via in-line assembly.
Are there any plans to support this keyword? If so, when would it be
folded into a new mspgcc release?
Thanks,
---------------------------------------------------------------
Andrew E. Kalman, Ph.D. a...@pumpkininc.com
Pumpkin, Inc.
home of Salvo, The RTOS that runs in tiny places.(TM)
http://www.pumpkininc.com
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You might also want to look at NESOS, it is a state-machine OS which
works really well on the MSP430. All process comms is done with
packets that re-use RAM so you need very little ram to run with. It also
only takes 4K of flash for the OS.
See : http://home.eunet.no/~jen/nenesos.html
Cheers,
Bernard Mentink
