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I'm hoping somebody out there has experience with using the Jump (CI) instruction to 're-use' interrupts and the NESTM bit. I have an ADSP-21160: Within my interrupt dispatcher (for LP4I), I use the Jump (CI) instruction to convert the interrupt into a normal subroutine. I do this solely in order to latch and detect another occurence of LP4I while servicing LP4I. The MODE1:NESTM bit equals 0, disabling nested interrupts. I've found that when another unmasked interrupt occurs (LP2I) while servicing LP4I, the DSP jumps straight to the LP2I handler. I would have expected the DSP to latch LP2I, then wait until finishing LP4I before handling LP2I. My questions: 1. Now that I have used Jump (CI), can I expect nested interrupts to be properly disabled? 2. Besides using Jump (CI), is there any other way to detect LP4I while servicing LP4I? thanks -Robert Yu |
jump (CI) and NESTM
Started by ●June 19, 2001
