main.asm

基于visual dsp++开发环境

/*****************************************************************************
**																			**
**	 Name: 	BF537 ASM Talkthrough I2S										**	
**																			**
******************************************************************************

Analog Devices, Inc.  All rights reserved.

File Name:	Main.asm

Date Modified:	12/14/04	Rev 1.0

Hardware:	ADSP-BF537 EZ-KIT Board

Purpose:	This program sets up the ADSP-BF537 to reset the ADC and DAC.  
			The data to/from the DAC/ADC are transfered over SPORT0 in I2S mode.		                                          
				                                                                          
Program Parameters:                                                                                       
                                                                                                          
******************************************************************************/                           

#include "Talkthrough.h"

/*****************************************************************************

Variables																
																			
Description:	The variables ChannelxLeftIn and ChannelxRightIn contain 	
		the data coming from the codec ADC (AD1871).  The (processed)		
		playback data are written into the variables 			
		ChannelxLeftOut and ChannelxRightOut respectively, which 	
		are then sent back to the DAC (AD1854) in the SPORT0 ISR.  		
				
******************************************************************************/

.section L1_data_a;

// left input data from AD1871
.var Channel0LeftIn, Channel1LeftIn;
// right input data from AD1871
.var Channel0RightIn, Channel1RightIn;
// left ouput data for AD1854
.var Channel0LeftOut, Channel1LeftOut;
// right ouput data for AD1854
.var Channel0RightOut, Channel1RightOut;
// SPORT0 DMA transmit buffer
.align 4;
.byte4	tx_buf[4];
// SPORT0 DMA receive buffer
.align 4;
.byte4	rx_buf[4];
										
/*****************************************************************************
 Function:	_main														
																			
 Description:	After calling a few initalization routines, main just 		
		waits in a loop forever.  The code to process the incoming  
		data can be placed in the function Process_Data in the	 
		file "Process_Data.asm".									

******************************************************************************/

.global _main;

.section L1_code;
_main:
	call Init_Flags;
	call Audio_Reset;
	call Init_Sport0;
	call Init_DMA;
	call Init_Interrupts;
	call Enable_DMA_Sport0;
	
WAIT_FOREVER:
	jump WAIT_FOREVER;
_main.END: