8-bit MicrocontrollersのトピックRe: about the stack operation error

about the stack operation error

m7Cgde — Tue, 04 Aug 2009 13:48:03 GMT

Hi,Dear Friends,

When the program returns from the Interrupt service program,the PC pointer must be poped from stack.But I found that the PC pointer is error,the stack content which is PC pointer saved is DE7F,but when poped from the stack,the PC pointer is FE7F.Could you help explain why?

Thanks.

Ningyinggen

Re: about the stack operation error

tonyp — Tue, 04 Aug 2009 14:41:11 GMT

Could you be corrupting the stack while inside the ISR?

Re: about the stack operation error

bigmac — Tue, 04 Aug 2009 20:06:22 GMT

Hello Ningyinggen,

You might try increasing the size of the stack. When the stack is too small, more often the stack will over-write static variables. However, it is also possible that a write to a static variable, within an ISR, can corrupt the stack under these circumstances.

If the unspecified device that you are using has a very small amount of RAM, another possibility is to allocate global/static variables to zero page RAM. This would allow you to increase the stack size. With a small device, it is also inadvisable to attempt to implement floating point operations. Nested interrupts should also be avoided. These require copious quantities of stack.

Regards,

Mac

Re: about the stack operation error

m7Cgde — Wed, 05 Aug 2009 12:19:11 GMT

Hi,Dear Friends,

Thanks for your reply, it is not the problem of stack size, I have a try to increasing stack size enough,but have the same problem.

Re: about the stack operation error

peg — Wed, 05 Aug 2009 12:25:42 GMT

Hi,

How about you post your ISR code then.