switching context on MSP430

brOS · 2009-09-29T13:48:56+00:00

Hi all,I am working on a small RTOS for MSP430. It should just provide schedulerwith ability to switch and change context.... Of course I have system tickISR which is handling ticks. And here is the thing...When I take a look indisassembly, it says that before msp430 enters system tick ISR it pushesregisters R15,R14,R13 and R12(and of course PC and SR) on stack. So I usedthat for context switching....At the beginning of the ISR I just save SPin TCB of interrupted Task so I could later restore it just by changingSP(changing stacks) and popping from stack. But what will happen if I havecode like this in my task routine ?///////////////////////////// unsigned int j,i,k,q,m; for(i=1;i