initsport.asm

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

///////////////////////////////////////////////////////////////////////////////////////
//NAME:     initSPORT.asm
//DATE:     7/29/05
//USAGE:    This file initializes the transmit and receive serial ports (SPORTS). It uses
//			SPORT0 to receive data from the SPDIF Rx and transmits the data to the
//			SPDIF Tx via SPORT3A.
//
////////////////////////////////////////////////////////////////////////////////////////

#include <def21369.h>

.global _initSPORT;
.section/pm seg_pmco;

_initSPORT:

	//============================================================
	//
	// Make sure that the multichannel mode registers are cleared
	//
	//============================================================

	r0 = 0;
	dm(SPMCTL0) = r0;
	dm(SPMCTL3) = r0;
	dm(SPCTL0) = r0;
    dm(SPCTL3) = r0;

	//============================================================
	//
	// Configure SPORT 0 for input from SPDIF
	//
	//    OPMODE = I2S mode
	//    L_FIRST = I2S sends left channel first
	//    SLEN24 = 24 bit of data in each 32-bit word
	//    SPEN_A = Enable data channel A
	//
	//------------------------------------------------------------

	dm(DIV0) = r0;
	r1 = OPMODE | L_FIRST | SLEN24 | SPEN_A;
	dm(SPCTL0) = r1;


	//============================================================
	//
	// Configure SPORT 3 for output to SPDIF
	//
	//    SPTRAN = Transmit on serial port
	//    OPMODE = I2S mode
	//    L_FIRST = I2S sends left channel first
	//    SLEN24 = 24 bit of data in each 32-bit word
	//    SPEN_A = Enable data channel A
	//
	//------------------------------------------------------------

	dm(DIV3) = r0;
	r1 = SPTRAN | OPMODE | L_FIRST | SLEN32 | SPEN_A;
	dm(SPCTL3) = r1;


_initSPORT.end:
	rts;