initad50.asm

数字音频混响器设计 用于DSP实现,实现混音效果.

			.include	"reg.h"
			.def		_init_AD50
			.mmregs
temp        .usect 		"temp",1
NOP_REQ		.set		0000h	; Pseudo reg0 val
REG1_VAL	.set		0104h	; INP & INM for DAC, (15+1)bit mode DAC
READ_REG1   .set        2100h	; read reg1 value
REG2_VAL	.set		0210h 	; 16-bit ADC mode, rest is default 
REG3_VAL	.set		0300h	; No delayed frame-sync
REG4_VAL	.set		04F0h	; Fs = MCLK/(256*N) = 8.192E6/(256*4) 
								; Gain: Input=0dB, Output=0db
SEC_REQ		.set		0001h
RST_REQ     .set        0180h

			.text
_init_AD50:	  
			PORTW	15,#0;向0端口写15地址存的数据
			NOP
			NOP
			
            STM 	SPCR2,MCBSP1_SPSA;加载子地址0001h给mcbsp地址寄存器
LOOP1:      BITF    *(MCBSP1_SPSD), #0x0002               
        	BC      LOOP1, NTC ;数据是否被TLC320AD50C接收
        	NOP
        	NOP
        	
 		   	STM 	SEC_REQ, MCBSP1_DXR1	
 		    STM 	SPCR2,MCBSP1_SPSA;加载子地址0001h给mcbsp地址寄存器
LOOP11:     BITF   	*(MCBSP1_SPSD), #0x0002               
        	BC      LOOP11,NTC ;数据是否被TLC320AD50C接收
        	NOP
        	NOP
        	
 		   	STM 	#REG4_VAL, MCBSP1_DXR1	
 		   	STM 	SPCR2,MCBSP1_SPSA
LOOP2:      BITF    *(MCBSP1_SPSD), #0x0002               
        	BC      LOOP2, NTC 
        	NOP
        	NOP
        	
 		   	STM 	SEC_REQ, MCBSP1_DXR1	
			STM 	SPCR2,MCBSP1_SPSA
LOOP22:    	BITF    *(MCBSP1_SPSD), #0x0002               
        	BC      LOOP22, NTC
        	NOP
        	NOP 
        	
 		   	STM 	#REG1_VAL, MCBSP1_DXR1	 		   	
 		    STM 	SPCR2,MCBSP1_SPSA
LOOP3:     	BITF    *(MCBSP1_SPSD), #0x0002               
        	BC      LOOP3, NTC 
        	NOP
        	NOP
        	
 		   	STM 	SEC_REQ, MCBSP1_DXR1 			
 		   	STM 	SPCR2,MCBSP1_SPSA
LOOP33:     BITF   	*(MCBSP1_SPSD), #0x0002               
        	BC      LOOP33, NTC 
        	NOP
        	NOP
        	
 		   	STM 	#REG2_VAL, MCBSP1_DXR1 		   			
            STM 	SPCR2,MCBSP1_SPSA
LOOP4:     	BITF    *(MCBSP1_SPSD), #0x0002               
        	BC      LOOP4, NTC 
        	NOP
        	NOP
        	
 		   	STM 	SEC_REQ, MCBSP1_DXR1 		   			   	
		    STM 	SPCR2,MCBSP1_SPSA
LOOP44:    	BITF    *(MCBSP1_SPSD), #0x0002               
        	BC      LOOP44, NTC 
        	NOP
        	NOP
        	
 		   	STM 	#REG3_VAL, MCBSP1_DXR1
           	RETD
			NOP
			NOP