initsru.asm

ADI 公司的DSP ADSP21369 EZ-KIT LITE开发板的全部源代码

/***************************************************************************************************
**
**  File: initSRU.asm
**  Date: 7/29/05
**  Use:  ADSP-21369 EZkit. The program initializes and sets the SRU & DAI/DPI pins
**
*****************************************************************************************************/

#include <def21369.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>

.section /pm seg_pmco;
.global _initSRU;


_initSRU:

    // Disable the pull-up resistors on all 20 pins
    r0 = 0x000FFFFF;
    dm(DAI_PIN_PULLUP) = r0;


//-----------------------------------------------------------------------------
//
//  MCLK: The output of the 12.288 MHz xtal is either directly connected to the
//             codec, but also connected to DAI_P06, or just to DAI_P17. This is
//             determined by switch SW3 For this example we route the
//             MCLK into DAI_P17 and supply the clock to the ADC via DAI_P06
//             by routing the signal through the SRU.

//  Tie the pin buffer input LOW.
    SRU(LOW,DAI_PB17_I);

//  Tie the pin buffer enable input LOW
    SRU(LOW,PBEN17_I);


  /*
    The Steps will be as follows.
    1. Connect DIR to SPORT0
    2. Connect SPORT1 to SRC1-INPUT
    3. Connect SRC1-OUTPUT to SPORT2
    4. Connect SPORT3&4 to DAC's
    */

    // Tie the pin buffer input LOW.
    SRU(LOW,DAI_PB18_I);

    // Tie the pin buffer enable input LOW
    SRU(LOW,PBEN18_I);

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

//-------------------------------------------------------------------------
//Input to the DSP

    // Clock in from SPDIF RX
    SRU(DIR_CLK_O,SPORT0_CLK_I);    //Connect CLK_O to SPO_CLK
    SRU(DIR_CLK_O,SPORT1_CLK_I);    //Connect CLK_O to SP1_CLK
    SRU(DIR_CLK_O,SRC1_CLK_IP_I);   //Connect CLK_O to SRC1_CLK

    // Frame sync from SPDIF RX
    SRU(DIR_FS_O,SPORT0_FS_I);      //Connect FS_O to SPO_FS
    SRU(DIR_FS_O,SPORT1_FS_I);      //Connect FS_O to SP1_FS
    SRU(DIR_FS_O,SRC1_FS_IP_I);     //Connect FS_O to SRC1_FS

    //  Data in from SPDIF RX
    SRU(DIR_DAT_O,SPORT0_DA_I);     //Connect DAT_O to SPO_DA
    SRU(SPORT1_DA_O,SRC1_DAT_IP_I); //Connect SP1_DA to SRC1_DAT

//-------------------------------------------------------------------------
//Output from the DSP


     SRU(DAI_PB07_O,DAI_PB13_I);
     SRU(DAI_PB08_O,DAI_PB14_I);

     //  Clock in from ADC
     SRU(DAI_PB07_O,SRC1_CLK_OP_I);
     SRU(DAI_PB07_O,SPORT2_CLK_I);
     SRU(DAI_PB07_O,SPORT3_CLK_I);
     SRU(DAI_PB07_O,SPORT4_CLK_I);

    //  Frame sync from ADC
    SRU(DAI_PB08_O,SRC1_FS_OP_I);
    SRU(DAI_PB08_O,SPORT2_FS_I);
    SRU(DAI_PB08_O,SPORT3_FS_I);
    SRU(DAI_PB08_O,SPORT4_FS_I);


    //  Data from the DSP
    SRU(SRC1_DAT_OP_O,SPORT2_DA_I);   
    SRU(SPORT3_DA_O,DAI_PB09_I);
    SRU(SPORT3_DB_O,DAI_PB10_I);
    SRU(SPORT4_DA_O,DAI_PB11_I);
    SRU(SPORT4_DB_O,DAI_PB12_I);

    //AD1835 MCLK
    SRU(DAI_PB17_O,DAI_PB06_I);

    //ADC data on DAI Pin 05    
    SRU(DAI_PB05_O,SPORT2_DB_I);  
    SRU(LOW,PBEN05_I);       

//------------------------------------------------------------------------
// Tie the pin buffer enable inputs HIGH to make DAI pins 9-14 outputs.
// and pins 7, 8 & 18 LOW to make them inputs

    SRU(HIGH,PBEN06_I);
    SRU(LOW,PBEN07_I);
    SRU(LOW,PBEN08_I);
    SRU(HIGH,PBEN09_I);
    SRU(HIGH,PBEN10_I);
    SRU(HIGH,PBEN11_I);
    SRU(HIGH,PBEN12_I);
    SRU(HIGH,PBEN13_I);
    SRU(HIGH,PBEN14_I);
    SRU(LOW,PBEN18_I);
//--------------------------------------------------------------------------
// Route SPI signals to AD1835.

    SRU(SPI_MOSI_O,DPI_PB01_I)      //Connect MOSI to DPI PB1.
    SRU(DPI_PB02_O, SPI_MISO_I)     //Connect DPI PB2 to MISO.
    SRU(SPI_CLK_O, DPI_PB03_I)      //Connect SPI CLK to DPI PB3.
    SRU(SPI_FLG3_O, DPI_PB04_I)     //Connect SPI FLAG3 to DPI PB4.
//---------------------------------------------------------------------------
// Tie pin buffer enable from SPI peipherals to determine whether they are
// inputs or outputs

    SRU(SPI_MOSI_PBEN_O, DPI_PBEN01_I);
    SRU(SPI_MISO_PBEN_O, DPI_PBEN02_I);
    SRU(SPI_CLK_PBEN_O, DPI_PBEN03_I);
    SRU(SPI_FLG3_PBEN_O, DPI_PBEN04_I);

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

_initSRU.end:

    rts;