Microchip Technology AC164343 データシート
© 2005 Microchip Technology Inc.
DS30177T-page 11
Software
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.
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
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
register usage, cycle count and function size
information
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)
FREE