getting elapsed time of a clock instance?

Check the Clock APIs.  I believe there's a Clock API to get the currect clocktick.

Judah

I don't see anything that would give me the remaining (or elapsed) time on the clock. Can you point out which function does that?

You can do the following:

#include <ti/sysbios/knl/package/internal/Clock.xdc.h>

Clock_Handle handle = Clock_handle(&ptrToClockStruct);

uint32_t currTicks = Clock_getTicks();
uint32_t ticksUntilNextTrigger = handle->currTimeout - currTicks;
uint32_t secondsUntilNextTrigger = Clock_tickPeriod * ticksUntilNextTrigger / 1000000;

uint32_t secondsUntilNextTick = Seconds_Get() + secondsUntilNextTrigger;