[Avrora] MSP430 / TelosB support for Avrora
royshea at gmail.com
Tue Jan 18 10:57:19 PST 2011
Great job getting the simulation for blink up and running on the MSP430!
> I think the MSP430 handles the carry bit differently from other
> architectures (at least for subtraction). I am still not sure how exactly it
> works, but by inverting the meaning for subtractions (sub, subc and cmp
> instructions) I got the simulation of the TinyOS Blink application to work.
With regards to the carry bit, take a look at the instruction summary
provided in the user guide for the subtraction operations:
There's a note describing the fact that the borrow used to set the carry
flag is treated as a .NOT so that:
Borrow yes -> Carry 0
Borrow no -> Carry 1
Does that clear things up?
Again, great job getting the MSP430 instruction set further along.
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