What are some of the problems associated with software interrupt priorities?
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For one thing, the startup latency of all the ISRs is increased by the time spent in the “master” ISR. This can be a problem in time-critical systems.
This scheme allows interrupts to be nested, so the stack must be large enough to handle the worst-case nesting of ISRs, on top of the worst-case nesting of non-interrupt subroutine calls. Finally, it is very tricky to do this in anything other than assembly language. If you want to use a high-level language, you’ll need to be intimately familiar with the language’s run-time library and how it handles interrupts and reentrancy in general.
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