All:
Setup: CCS 5.5, C6713, DSP/BIOS 5.42, CGT 7.4.6
Interrupt Keyword Measurement - 49 cycles
I set up a breakpoint at the entry of the interrupt (in the interrupt service table) and a second breakpoint a the end of the Context-Save in the interrupt service routine. I then used the "profile clock" to make the measurement of 49 cycles.
DSP/BIOS Dispatcher Measurement - 307 cycles
I set up a breakpoint at the entry of the interrupt associated with the dispatcher, and a second breakpoint at the beginning of the interrupt service routine (function). I again used the "profile clock" to make the measurement of 307 cycles.
As it turns out, the only DSP/BIOS api that is run in the second interrupt is PRD_tick( ). It looks like I can use the interrupt keyword instead of the dispatcher IF I make use of one of the internal timers (timer0 or timer1) to do the PRD clocking.
Another option appears to be using an assembly-base interrupt service routine and then using the HWI_enter and HWI_exit macros, allowing me to then call the PRD_tick( ) from the assembly routine. (A lot more effort!)
Are there other options that can allow me to do away with the dispatcher on the second interrupt?
