Specifications

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dsPIC30F DSP Library

The dsPIC30F DSP Library provides a set of

speed-optimized functions for the most common digital

signal processing applications. The DSP Library

provides significant performance savings over

equivalent functions coded in ‘C’ and allows

developers to dramatically shorten their development

time.

The DSP Library is written predominantly in Assembly

language and makes extensive use of the dsPIC30F

DSC instruction set and hardware resources, including

X and Y memory addressing, modulo addressing,

bit-reversed addressing, 9.31 saturation and REPEAT

and DO loops. It provides functions for vector, matrix,

filtering, transform and window operations.

Features

• 49 total functions

• Full compliance with the Microchip dsPIC30F C30

Compiler, Assembler and Linker

• Simple user interface – just one library file and one

header file

• Functions are both ‘C’ and Assembly callable

• FIR filtering functions include support for Lattice,

Decimating, Interpolating and LMS filters

• IIR filtering functions include support for Canonic,

Transposed Canonic and Lattice filters

• FIR and IIR functions may be used with the filter files

generated by the dsPIC

DSC Digital Filter Design

Tool

• Transform functions include support for in-place and

out-of-place DCT, FFT and IFFT transforms

• Window functions include support for Bartlett,

Blackman, Hamming, Hanning and Kaiser windows

• Support for Program Space Visibility

• Complete function profile information, including

information

Function Execution Times Table

Function Cycle Count Equation Conditions Number of Cycles* Execution Time @ 30 MIPS

Complex FFT** — N = 64 3739 124.6 μs

Complex FFT** — N =1 28 8485 282.8 μs

Complex FFT** — N = 256 19055 635.2 μs

Block FIR 53 + N(4 + M) N = 32, M = 32 1205 40.2 μs

Block FIR Lattice 41 + N(4 + 7M) N = 32, M = 32 7337 244.6 μs

Block IIR Canonic 36 + N(8 + 7S) N = 32, S = 4 1188 39.6 μs

Block IIR Lattice 46 + N(16 + 7M) N = 32, M = 8 2350 78.3 μs

Matrix Add 20 + 3(C * R) C = 8, R = 8 212 7.1 μs

Matrix Transpose 16 + C(6 + 3(R – 1)) C = 8, R = 8 232 7.7 μs

Vector Dot Product 17 + 3N N = 32 113 3.8 μs

Vector Max 19 + 7(N – 2) N = 32 229 7.6 μs

Vector Multiply 17 + 4N N = 32 145 4.8 μs

Vector Power 16 + 2N N = 32 80 2.7 μs

Legend: C = # columns, N = # samples, M = # taps, S = # sections, R = # rows

* 1 Cycle = 33 nanoseconds @ 30 MIPS.

** Complex FFT routine inherently prevents overflow.

Ordering Information:

SW300022 dsPIC30F DSP Library (Free download: www.microchip.com)

DS51443

“dsPIC30F DSP Library Product Overview”

(Available at: www.microchip.com)