initsport.c

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

///////////////////////////////////////////////////////////////////////////////////////
//NAME:     initSPORT.c (Block-based Talkthrough)
//DATE:     7/29/05
//PURPOSE:  Talkthrough framework for sending and receiving samples to the AD1835.
//
//USAGE:    This file uses SPORT0 to receive data from the SPDIF Rx and transmits the
//          data to the SPDIF Tx via SPORT3A. DMA Chaining is enabled
//
////////////////////////////////////////////////////////////////////////////////////////

#include "tt.h"

unsigned int PCI = 0x00080000 ;
unsigned int OFFSET = 0x00080000 ;

// TCB blocks for Chaining
// Input ping pong blocks
unsigned int InBlock_A[NUM_SAMPLES] ;
unsigned int InBlock_B[NUM_SAMPLES] ;
// Output ping pong blocks
unsigned int OutBlock_C[NUM_SAMPLES] ;
unsigned int OutBlock_D[NUM_SAMPLES] ;

//Set up the TCBs to rotate automatically
int TCB_Block_InA[4] = { 0, sizeof(InBlock_A), 1, 0};;
int TCB_Block_InB[4] = { 0, sizeof(InBlock_B), 1, 0};
int TCB_Block_OutC[4] = { 0, sizeof(OutBlock_C), 1, 0};
int TCB_Block_OutD[4] = { 0, sizeof(OutBlock_D), 1, 0};

void InitSPORT()
{
    //Proceed from Block A to Block B
    TCB_Block_InA[0] = (int) TCB_Block_InB + 3 - OFFSET + PCI ;
    TCB_Block_InA[3] = (unsigned int) InBlock_A - OFFSET ;

    //Proceed from Block B to Block A
    TCB_Block_InB[0] = (int) TCB_Block_InA + 3 - OFFSET + PCI ;
    TCB_Block_InB[3] = (unsigned int) InBlock_B - OFFSET ;

    //Proceed from Block C to Block D
    TCB_Block_OutC[0] = (int) TCB_Block_OutD + 3 - OFFSET + PCI ;
    TCB_Block_OutC[3] = (unsigned int) OutBlock_C - OFFSET ;

    //Proceed from Block C to Block D
    TCB_Block_OutD[0] = (int) TCB_Block_OutC + 3 - OFFSET + PCI ;
    TCB_Block_OutD[3] = (unsigned int) OutBlock_D - OFFSET ;

    /*//////////////////////////////////////////////////////////
    //                                                        //
    //     SPORT Loopback: Use SPORT0 as RX & SPORT3 as TX    //
    //                                                        //
    ////////////////////////////////////////////////////////////

    //initially clear SPORT control register */

    *pSPMCTL0 = 0 ;
    *pSPMCTL3 = 0 ;
    *pSPCTL0 = 0 ;
    *pSPCTL3 = 0 ;

    // Configure SPORT0 as a reciever externally generating clock and frame sync
    *pDIV0 = 0;
    *pSPCTL0 = (SPEN_A|    /* Enable Channel A */
         SLEN24|    /* 32-bit word length */
         OPMODE|    /* Enable I2S Mode*/
         L_FIRST|   /* I2S sends left channel first */
         SDEN_A|    /* Enable Channel A DMA */
         SCHEN_A);  /* Enable Channel A DMA Chaining */

    // Enabling Chaining
    // Block A will be filled first
    *pCPSP0A = (unsigned int) TCB_Block_InA - OFFSET + 3 ;


    /* Configure SPORT3 as a transmitter */
    *pDIV3 = 0;
    *pSPCTL3 = (SPEN_A|    /* Enable Channel A */
         L_FIRST|   /* I2S sends left channel first */
         SLEN32|    /* 32-bit word length */
         SPTRAN|    /* Transmit on enabled channels */
         SDEN_A|    /* Enable Channel A DMA */
         SCHEN_A|   /* Enable Channel A DMA Chaining */
         OPMODE);   /* Enable I2S Mode*/
    *pCPSP3A = (unsigned int) TCB_Block_OutC - OFFSET + 3 ;


}