Download TMS320C31 Embedded Control Technical Brief

Spectron Microsystems Inc.
SPOX OS also provides a mechanism for adding platform-dependent drivers—software modules that encapsulate low-level hardware details by interpreting device-independent I/O requests in a device-dependent fashion. Device drivers are the key to customizing SPOX for a particular system environment, and to ensuring portability of SPOX applications from
one system to the next.
Unlike virtually every other operating system or realtime executive, the device-independent I/O interface supported by SPOX does not include a
read() or write() function in the traditional sense. Rather than mandating one pair of general-purpose functions for all input and output, SPOX
allows for a broader set of I/O operations optimized for two fundamentally
different forms of program interaction with underlying devices found in
realtime DSP systems:
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Asynchronous data streaming, in which the program and device are in
a producer/consumer relationship and
Synchronous message passing, in which the program and device are
in a client/server relationship.
C Runtime Environment
The SPOX application libraries include many of the standard functions
which are typically not implemented by C compilers targeted for DSP processors. Included among these are the routines comprising the C stdio
library together with other standard functions requiring operating system
support:
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Opening/closing named files (fopen, fclose, ...)
Reading/writing byte streams (getc, putc, ...)
Formatted I/O (printf, scanf, ...)
Utility functions (system, time, ...)
Program termination (exit, abort, ...)
Memory management (malloc, free, ...)
By furnishing these functions, the SPOX application libraries enable many
standard C programs normally run on a host computer under UNIX or
MS-DOS to be literally recompiled and executed faster on attached DSP
hardware.
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DSP Math Functions
SPOX furnishes over 100 standard math functions that can be used as
building blocks for algorithms employed in advanced DSP applications,
such as:
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