PM0014 datasheet(9/46 Pages) STMICROELECTRONICS

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PM0014

Using the ST10-DSP library

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3.4

Tool chain compatibility

As ST10 has different memory models, a library file has been generated for each memory

model: tiny, small, medium, large.

ST10-DSP library is compatible with Tasking tool chain (V7.0r1 and upward).

3.5

ST10 device compatibility

The ST10-DSP library is defined to be compatible with all ST10-DSP variants, including the

bond-out.

As a consequence, it implements the needed workarounds for the functional features that

may be on silicon devices (see respective product errata-sheets).

3.6

ST10 MAC configuration

As this library has be done primarily for filtering functions,

it assumes fractional variables

are used. As a consequence, users shall set bit "MP" in the MAC control word either at

the reset sequence or before calling any function.

3.7

Interrupts

As explained before, any DSP code developed for ST10 can be interrupted at any time and

execution resumed after the interrupt routine. There is no added latency when the DSP

library is used.

Interrupt routine requirements: the only requirements are only when the DSP unit is used

by task that have different priorities: the interrupting task that may interrupt another task

using the DSP should save and restore the MAC registers at the entry point and exit point of

the routine. (

use #pragma savemac in Tasking tool chain).

3.8

Naming convention and parameter passing

The name of a function begins with a lowercase. Each uppercase starts a new word in the

name. Underscore is used to separate type of data. Types after the name indicate the types

of the parameters passed to the function.

Example: fir_q15_q31_q15

The first q15 indicates the inputs format. q31 corresponds to the type of coefficients. The

last q15 indicates the output format.

Variable formats:

●

q31 means a signed fractional variable with two’s complement fractional format using

the 1.31 format (1 signed, 31 fractional bits).

●

q15 means a signed fractional variable with two’s complement fractional format using

the 1.31 format (1 signed, 15 fractional bits).

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