On 7/9/07, Zhifeng Lai <[EMAIL PROTECTED]> wrote:
Dear David,
I do not have the background on developing embedded systems; I started to
learn nesC half a year ago for research purpose.
Do you mean that some commands in avr library that manipulate memory-mapped
I/O will enable interrupts as a side effect? If so, could you give me some
concrete examples (I just learned that the "sei" macro in avr library can
enable interrupts)?
*(int *)0x5f |= 0x80;
does the same thing as "sei" - the SREG register is memory-mapped to
address 0x5f. Read the Atmega128 datasheet for more information.
And read up on memory-mapped I/O and DMA if my previous comment didn't
make sense.
As to whether application programmers would do this, you'd have to ask
them. But it sounded like you wanted to *prevent* this, not just
assume programmers didn't do it...
David Gay
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