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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
Function Execution Times Table
? 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
register usage, cycle count and function size
information
Function
Complex FFT**
Complex FFT**
Complex FFT**
Block FIR
Block FIR Lattice
Block IIR Canonic
Block IIR Lattice
Matrix Add
Matrix Transpose
Vector Dot Product
Vector Max
Vector Multiply
Vector Power
Cycle Count Equation
—
—
—
53 + N(4 + M)
41 + N(4 + 7M)
36 + N(8 + 7S)
46 + N(16 + 7M)
20 + 3(C * R)
16 + C(6 + 3(R – 1))
17 + 3N
19 + 7(N – 2)
17 + 4N
16 + 2N
Conditions
N = 64
N =1 28
N = 256
N = 32, M = 32
N = 32, M = 32
N = 32, S = 4
N = 32, M = 8
C = 8, R = 8
C = 8, R = 8
N = 32
N = 32
N = 32
N = 32
Number of Cycles*
3739
8485
19055
1205
7337
1188
2350
212
232
113
229
145
80
Execution Time @ 30 MIPS
124.6 μ s
282.8 μ s
635.2 μ s
40.2 μ s
244.6 μ s
39.6 μ s
78.3 μ s
7.1 μ s
7.7 μ s
3.8 μ s
7.6 μ s
4.8 μ s
2.7 μ s
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
DS51443
dsPIC30F DSP Library (Free download: www.microchip.com)
“dsPIC30F DSP Library Product Overview” (Available at: www.microchip.com)
? 2005 Microchip Technology Inc.
DS30177T-page 11
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