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Has anyone seen a case where the '5416 could miss an interrupt?
I'm grasping at straws here I know. I've got this SPI interface that uses a couple of interrupt lines to control the flow of the data, and it works most of the time :> But after running for a bit (seconds to a minute or so) somethnig happens and it stops. Examining my state machine indicates that it totally missed an ack interrupt from the slave processor. In the INT0 interrupt I'm incrementing a counter that is checked and decremented in non-interrupt time (surrounded by INTM=1/INTM=0 even though I don't think a *(var) -= #1 needs interrupt protection because its a single instruction, right? Looking at the data on a scope (Tek 458, not great for this) I see SPI clocks and an ack, so the slave, as far as I can tell, really is pulling the line low (for about 1uS, more than long enough for the DSP). The DSP has a variety of things happening, mostly DMA interrupts going off. I really doubt the DSP could be missing the irq, but it sure looks that way! Does this ring any bells with anyone? Thanks, Brian ----------------- Brian C. Lane (W7BCL) Programmer www.shinemicro.com RF, DSP & Microcontroller Design |
Missed INT0 Interrupt?
Started by ●April 11, 2003
