initsru.c

对ADSP21369的原理图和测试程序进行搜集

///////////////////////////////////////////////////////////////////////////////////////
//NAME:     initSRU.c (Block-based Talkthrough)
//DATE:     7/29/05
//PURPOSE:  Talkthrough framework for sending and receiving samples
//
//USAGE:    This file initializes the DAI/DPI for accessing the SPDIF stream
//
////////////////////////////////////////////////////////////////////////////////////////
#include "tt.h"

// The following definition allows the SRU macro to check for errors. Once the routings have
// been verified, this definition can be removed to save some program memory space.
// The preprocessor will issue a warning stating this when using the SRU macro without this
// definition
#define SRUDEBUG  // Check SRU Routings for errors.
#include <SRU.h>

//------------------------------------------------------------------------

void InitSRU(){

// Disable the pull-up resistors on all 20 pins
    *pDAI_PIN_PULLUP = 0x000FFFFF;


//------------------------------------------------------------------------
//  Connect the SPDIF Receiver
    SRU(DAI_PB18_O, DIR_I);

//------------------------------------------------------------------------
//  Connect the SRC 0 inputs.

    SRU(DIR_DAT_O, SPORT0_DA_I);          //  Data in from the SPDIF RX
    SRU(DIR_FS_O, SPORT0_FS_I);            //  Input Frame sync from the SPDIF RX
    SRU(DIR_CLK_O, SPORT0_CLK_I);          //  Input clock from the SPDIF RX

//------------------------------------------------------------------------
//  Connect the SPDIF Transmitter Inputs

    SRU(SPORT3_DA_O, DIT_DAT_I);          //  Data in from SPORT 3A
    SRU(DIR_FS_O, DIT_FS_I);               //  Frame sync from SPDIF receiver
    SRU(DIR_CLK_O, DIT_CLK_I);             //  Clock from SPDIF receiver
    SRU(DIR_CLK_O, SPORT3_CLK_I);             //  Clock from SPDIF receiver
    SRU(DIR_TDMCLK_O, DIT_HFCLK_I);         //  Oversampling Clock from SPDIF receiver
    SRU(DIR_FS_O, SPORT3_FS_I );         //  FS from SPDIF receiver

//------------------------------------------------------------------------
//  Connect the SPDIF Transmitter Output.
    SRU(DIT_O, DAI_PB01_I);

//------------------------------------------------------------------------
//  Tie the pin buffer inputs LOW for DAI pin 18.  Even though
//    these pins are inputs to the SHARC, tying unused pin buffer inputs
//    LOW is "good coding style" to eliminate the possibility of
//    termination artifacts internal to the IC.  Note that signal
//    integrity is degraded only with a few specific SRU combinations.
//    In practice, this occurs VERY rarely, and these connections are
//    typically unnecessary.

    SRU(LOW, DAI_PB18_I);

//------------------------------------------------------------------------
//  Tie the pin buffer enable inputs LOW for DAI pin 18 so
//    that they are always input pins.

    SRU(LOW, PBEN18_I);

//-----------------------------------------------------------------------------

//------------------------------------------------------------------------
//  Tie the pin buffer enable high
    SRU(HIGH, PBEN01_I);

}