PM0014 datasheet(10/46 Pages) STMICROELECTRONICS

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Using the ST10-DSP library

PM0014

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3.8.1

Arithmetic functions

When applicable, the parameters are passed in the following order:

●

Left operator imaginary part MSB

●

Left operator imaginary part LSB

●

Left operator real part MSB

●

Left operator real part LSB

●

Right operator imaginary part MSB

●

Right operator imaginary part LSB

●

Right operator real part MSB

●

Right operator real part LSB

●

Pointer to an output array.

3.8.2

Filter functions

There is only one parameter to be passed:

●

Pointer on a filter structure. This structure is defined in the filter functions chapter.

3.9

Testing a function

All functions of the DSP library are delivered with their test case.

3.9.1

Test environment

For each functions, test files have been created in the testMain directory:

●

X.in: File of input data on hexadecimal format.

●

X.res: This file contains outputs obtained by running the Asm source. Inputs are those

of the file X.in. Results are on hexadecimal format in X.res.

3.9.2

Using crossview debugger for testing

Crossview debugger has been used for the verification of the results thanks to the provided

test vectors. A Tasking project can contain the source asm or C function and a main

function. The output result can be displayed on a virtual IO or a hyperterminal.

3.10

Memory reservations

3.10.1

Data Alignment

As the library doesn’t use 8-bit values, there’s no data alignment restraint, even for Q1.31

variables.

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