main.asm

BF533 与音频解码器连接回放代码

/*****************************************************************************
**																			**
**	 Name: 	BF533 ASM Talkthrough I2S										**	
**																			**
******************************************************************************

(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved.

File Name:	Main.asm

Date Modified:	05/03/03	HD		Rev 1.0

Software:       VisualDSP++3.0

Hardware:	ADSP-BF533 EZ-KIT Board

Special Connections:  Connect RSCLK0 to TSCLK0 together (Turn SW9 pin 6 on).	
 		      Connect RFS0 to TFS0 together (Turn SW9 pin 5 ON).		
 		      Connect an input source (such as a radio) to the Audio	
  		      input jack and an output source (such as headphones) to
 		      the Audio output jack.

Purpose:	This program sets up the SPI port on the ADSP-BF533 to 
		configure the AD1836 codec.  The SPI port is disabled 	
		after initialization.  The data to/from the codec 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 AD1836.  The (processed)		
		playback data are written into the variables 			
		ChannelxLeftOut and ChannelxRightOut respectively, which 	
		are then sent back to the codec in the SPORT0 ISR.  		
		The values in the array Codec1836TxRegs can be modified to 
		set up the codec in different configurations according to   
		the AD1885 data sheet.					
			
******************************************************************************/

.section L1_data_a;

// left input data from ad1836
.var Channel0LeftIn, Channel1LeftIn;
// right input data from ad1836
.var Channel0RightIn, Channel1RightIn;
// left ouput data for ad1836
.var Channel0LeftOut, Channel1LeftOut;
// right ouput data for ad1836
.var Channel0RightOut, Channel1RightOut;
// array for registers to configure the ad1836
// names are defined in "Talkthrough.h"
.align 2;
.byte2	Codec1836TxRegs[CODEC_1836_REGS_LENGTH] =
{									
					DAC_CONTROL_1	| 0x000,
					DAC_CONTROL_2	| 0x000,
					DAC_VOLUME_0	| 0x3ff,
					DAC_VOLUME_1	| 0x3ff,
					DAC_VOLUME_2	| 0x3ff,
					DAC_VOLUME_3	| 0x3ff,
					DAC_VOLUME_4	| 0x000,
					DAC_VOLUME_5	| 0x000,
					ADC_CONTROL_1	| 0x000,
					ADC_CONTROL_2	| 0x000,
					ADC_CONTROL_3	| 0x040
					
};
// 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_EBIU;
	call Init_Flash;
	call Init_1836;
	call Init_Sport0;
	call Init_DMA;
	call Init_Interrupts;
	call Enable_DMA_Sport0;
	
WAIT_FOREVER:
	JUMP WAIT_FOREVER;

_main.END: