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Hi, I am an amateur using Code composer studio for TMS320C5472 voip processor. I am facing a unique problem. I have a main program which has an infinite "for loop", when it gets an interrupt it should jump to the interrupt service routine. When the processor gets interrupted the PC is pushed into the stack actually the stack must point to the next higher location but it points below the location where my return address is stored. Due to this my return from ISR is corrupted and hence unable to retrieve back to my main program. can anyone help on this From, sajan |
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Stack problem
Started by ●April 19, 2004
Reply by ●May 3, 20042004-05-03
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Is the ISR a hand written assembly function or generated by the C compiler? In either case, the ISR must make sure the stack pointer must "be aligned to a 32bit boundary" See Section 6.4 SPRU281C C55x C/C++ user's guide. An ISR doesn't can't know from what thread it interrupted and the stack alignment at that time so it needs to do a little stack manipulation first. I've seen the C compiler do this for functions designated with the "interupt" keyword. Create a real simple interupt functions in C and look at the assemnbly generated to see how it guarantees proper stack alignment -Shawn --- In , "rics_in" <rics_in@y...> wrote: > Hi, > I am an amateur using Code composer studio for TMS320C5472 voip > processor. I am facing a unique problem. I have a main program which > has an infinite "for loop", when it gets an interrupt it should jump > to the interrupt service routine. > When the processor gets interrupted the PC is pushed into the stack > actually the stack must point to the next higher location but it > points below the location where my return address is stored. Due to > this my return from ISR is corrupted and hence unable to retrieve > back to my main program. > > can anyone help on this > > From, > sajan |
