defsk.asm

c5402的几个小程序dsp开发板。学校实验室的程序

***********************************************************
*FSK解调程序 						  *
*输入波形为64个点的FSK信号				  *
***********************************************************
	.title	"DEFSK.asm"
	.mmregs
	.def 	start
    	.bss	temp,1
indata	.usect	"buffer",64
out	.usect	"buffer",1
STACK	.usect	"STACK",10
distance	.set	31
amplitude	.set	32700
************************************
	.text
start:	LD	#indata,DP
	STM	#indata,AR1
	nop
JUDGE:	LD	*AR1+,A		;循环检测幅度是否大于amplitude
	SUB	#amplitude,A
	BC	A1,AGT		
	B	JUDGE
************************************
A1:	MAR	*+AR1(distance)
	LD	*AR1+,A
	SUB	#amplitude,A
	BC	F1,AGT
***********************************	
F0:	ST	#0,@out
	B	start
F1:	ST	#1,@out
	B	start
	.end