Missed INT0 Interrupt? | TMS320C54x

Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).

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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

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Missed INT0 Interrupt? - Author Unknown - Apr 11 21:46:00 2003