3-9.asm

《DSP嵌入式系统开发典型案例》此书的源代码

             	.mmregs
             	.def 		jump
             	.def 		start
           
k_sample_num 	.set 		256
out_data     	.usect 	"out_vars",k_sample_num
in_data      	.usect 	"in_vars",1
d_cr0_send   	.usect 	"cr_send",1
d_cr1_send   	.usect 	"cr_send",1
d_temp       	.usect 	"temp",1
k_cr0_send   	.set 		0080h
k_cr1_send   	.set 		0100h

k_iptr       	.set 		000111000b<<07
k_temp       	.set 		1111111b
d_pmst       	.usect 	"pmst",1

             	.sect 		"prog"    
start:
             	ldm   	pmst,a
             	and   	#k_temp,a
             	or    	#k_iptr,a
             	stl   	a,ar2
             	mvdm  	ar2,pmst
             
             stm   	#0001h,imr
             nop
             nop
             stm   	#0002h,ifr
             nop
             rsbx  		intm  
             nop
             
             stm    	#d_temp,ar2
             stm    	#d_cr0_send,ar1
             st     	#k_cr0_send,*ar1+
             st     	#k_cr1_send,*ar1 
             stm    	#d_cr0_send,ar1
             ld     	#out_data,ar5
             portr  	0fffeh,*ar2
             portw  	*ar1+,07fffh
             nop
             nop
             nop                   
             nop
             nop
             portw  	*ar1,07fffh 
             nop
             nop
             nop
             nop
             portr 		0ffffh,*ar2
             nop
             nop
wait:        nop
             nop
             nop
             b    		wait 
             
jump:        rsbx  		xf
             nop
             nop
             nop
             portr 		07fffh,*ar5
             nop
             nop
             nop
             ssbx  		xf
             nop
             nop
             nop
             portr 		0fffeh,*ar2
             nop
             nop
             nop
             portw 	*ar5,0bfffh
             nop
             nop
             nop
             rete