Communications between ARM&DSP

The usual alternative to interrupts is Polling.

http://en.wikipedia.org/wiki/Polling_(computer_science)

What is it about interrupts that you want/need to avoid?

http://www.catb.org/~esr/faqs/smart-questions.html#goal

Thanks Andy for your fast answer.

I'm trying to understand how do communications work in concerto devices and, as far as I know, I have only used interrupts to communicate one DSP to the enviroment. I wondered if there was another method or technique to communicate the DSP inside the concerto to the ARM. It's more of knowledge rather than an avoidance.

I don't think it's documented yet, but there is also an internal connection available between the control and master sub-system over SPI/SSI.

So if you have a host to control SPI protocol already running on a two-chip solution today, that could migrate over easily.  Obviously slower than the IPC messaging / shared memory approach.