readme.txt

在ADSP-2126x上编写的优化过的IIR滤波器程序（用c和汇编编写）。

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Example: IIR_2nd_Order
Target: ADSP-21262
Date: January 15, 2004
Tools: VisualDSP++ 3.0 SP1
Hardware: ADSP-21262 EZ-KIT LITE
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Demonstrates cascaded second order IIR filter sections - single or SIMD

This example accepts analog stereo audio and passes in through to the four
analog stereo pairs in parallel.  Each of the channels of audio is filtered
with a 6th-order IIR filter, implemented as three cascaded second-order
sections in cannonic direct form II.

Note that all of the code specific to the IIR filter is in "_initAlgorithm.asm"
and "_Algorithm.asm".

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Instructions: Download the executable to the EZ-KIT.  There are no user
controls or visual outputs.  The four stereo output pairs are identical.
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Source Files contained in this directory:
_Algorithm.asm          The filter function called from the sample Rx ISR
_initAlgorithm.asm      Initialization specific to the filtering
init1835viaSPI.asm      Initializes the codec
initDAI.asm             Initializes the SRU & DAI pins
initSPORT.asm           Initializes the transmit and receive serial ports
isr.asm                 The SPORT0 (ADC) interrupt service routine
IIR_2nd_Order.dpj       VisualDSP Project File
ivt21262.asm            Interrupt vector table code
main.asm                Calls init routines then waits for interrupts
ad1835.h                Header with constants for controlling the audio codec
def21262.h              Header with constants for the SHARC
SRU.h                   Macro to simplify programming the SRU & DAI pins
ADSP-21262-EZKIT.ldf    Linker description file

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Analog Devices, Inc.
DSP Division
One Technology Way
Norwood, MA 02062

(c) 2004 Analog Devices, Inc.  All rights reserved.
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