diir.asm

CCS调试实验文件夹下共有9个文件夹

;直接形式的IIR数字滤波器通用程序		
		.title		"diir.asm"
		.mmregs
		.global start
		.def  	start,_c_int00
		
		.copy	"iirin.inc"    ;输入信号x(n)
		.copy	"diirdata.inc"	 ;滤波器系数Bn.An
        .data
BN		.usect	"BN",N+1
AN		.usect	"AN",N+1
INBUF   .usect	"INBUF",256      ;输入缓冲区在数据区0x2400
OUTPUT	.usect	"OUTPUT",256     ;输出缓冲区在数据区0x2600

        .text 
        .asg	AR0,INDEX_P
		.asg	AR2,XN_P
		.asg	AR3,ACOFF_P
		.asg	AR4,YN_P
		.asg	AR5,BCOFF_P
		 
_c_int00
		b start 
		nop
		nop
NMI	    rete
		nop
		nop
		nop
SINT17	.space 4*16
SINT18	.space 4*16
SINT19	.space 4*16
SINT20	.space 4*16
SINT21	.space 4*16
SINT22	.space 4*16
SINT23	.space 4*16
SINT24	.space 4*16
SINT25	.space 4*16
SINT26	.space 4*16
SINT27	.space 4*16
SINT28	.space 4*16
SINT29	.space 4*16
SINT30	.space 4*16
INT0	rsbx intm
		rete
		nop
		nop
INT1	rsbx intm
		rete
		nop
		nop
INT2	rsbx intm
		rete
		nop
		nop
TINT:	rete
		nop
		nop
RINT0:	rete
		nop
		nop
		nop
XINT0:	rete
		nop
		nop
		nop
RINT1:	rete
		nop
		nop
		nop
XINT1:	rete
		nop
		nop
		nop
INT3:	rete
		nop
		nop
		nop
start:  SSBX	FRCT
		SSBX 	OVM
		SSBX 	SXM 				
		STM		#BN+N,AR1
		RPT		#N
		MVPD	#table,*AR1- 
		STM		#AN+N-1,AR1
		RPT		#N-1
		MVPD	#table+N+1,*AR1- 
		STM		#OUTPUT,AR1
		RPTZ	A,#255
		STL	    A,*AR1+ 
		STM		#INBUF,AR1
		RPT		#255
		MVPD	#INPUT,*AR1+		
		STM		#OUTPUT,YN_P 
		STM		#INBUF,XN_P
		STM		#N-1,INDEX_P		
IIR:	SUB     A,A
		STM		#BN,BCOFF_P
		STM		#AN,ACOFF_P		 			    	   	
		RPT     #N-1                ;计算前向通道
		MAC		*XN_P+,*BCOFF_P+,A 
		MAC		*XN_P,*BCOFF_P,A 
		MAR     *XN_P-0 	            ;将AR2指针指向x(n-N)     	
		RPT   	#N-1				;计算反馈通道
		MAC		*YN_P+,*ACOFF_P+,A
		STH		A,*YN_P-0            ;保存y(n) 		
	    B		IIR
EEND	B 	EEND
 		.end