Embedded Systems Design, 2nd Edition

348 Embedded systems design

Buffer exchange

Buffer exchange is a technique that is used to simplify the

control code and allow multiple tasks to process data simultane-

ously without having to have control structures to supervise

access. In many ways it is a variation of the double buffering

technique.

This type of mechanism is common to the SPOX operating

system used for DSP processors and in these types of embedded

systems it is relatively simple to implement.

The main idea of the system is the concept of exchanging

empty buffers for full ones. Such a system will have at least two

buffers although many more may be used. Instead of normally

using a read ...