AN2182

ST10 DSP library

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ST10 DSP library

The ST10 DSP free library is a set of arithmetic and signal processing functions based on the

ST10 MAC unit. These functions are callable from C and fully compatible with the Tasking

compiler.

This library manipulates signed integers coded on 16 or 32 bits. These integers represent

numbers belonging to the interval [–1, 1[. We name these formats: Q1.31 and Q1.15.

Table 1.

Examples of integer representations

For a detailed description of the ST10 DSP library, please refer to the application note AN1442

“Signal processing with ST10-DSP”.

–1

-0.5

-0.25

0

0.25

0.5

Q1.15

0xFFFF

0xC000

0xA000

0x0000

0x2000

0x4000

0x7FFF

0x7FFF

Q1.31

0xFFFF

FFFF

0xC000

0000

0xA0000

000

0x00000

000

0x20000

000

0x40000

000

0x7FFF

0000

0x7FFFFFFF