max543正弦波.asm

12位串行DA,精度可以满足较高的要求,自己做了一下,感觉效果还不错

;spi接口为p1.0,p1.1,p1.2
        clk equ p1.0
        sri equ p1.1
        load equ p1.2

        org 00h
        ajmp start
        org 30h
start:  mov r7,#0
begin:
        acall init
        acall init_
        acall init_da
        ajmp begin

init:
        mov dptr,#table 
        mov a,r7
        movc a,@A+dptr
        mov r1,a
        mov r2,#255
        mov r3,#8
        mov r4,#4
        ret

init_:  setb load
        clr sri
        clr clk
        ret


init_da:
        acall mobile
        ;acall delay
        acall _ad
        ret

mobile:
        clr c
loop:
        mov a,r1
        rlc a
        mov sri,c
        mov r1,a
        ;acall delay
        setb clk
        ;acall delay
        clr clk
        ;acall delay
        djnz r3,loop
        inc r7
        clr c
loopl:
        mov a,r2
        rlc a
        mov sri,c
        mov r2,a
        ;acall delay
        setb clk
        ;acall delay
        clr clk
        ;acall delay
        djnz r4,loopl 
        ret

_ad:clr load
        ;acall delay
        ret

delay:  mov r6,#10h
d1:     djnz r6,d1
        ret
TABLE:	
DB 128, 131, 134, 137, 140, 144, 147, 150, 153, 156, 159, 162, 165, 168, 171, 174
DB 177, 180, 182, 185, 188, 191, 194, 196, 199, 201, 204, 206, 209, 211, 214, 216 
DB 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 237, 239, 240, 242, 243, 244 
DB 246, 247, 248, 249, 250, 251, 251, 252, 253, 253, 254, 254, 254, 255, 255, 255 
DB 255, 255, 255, 254, 254, 254, 253, 253, 252, 252, 251, 250, 249, 248, 247, 246 
DB 245, 244, 242, 241, 240, 238, 236, 235, 233, 231, 229, 227, 225, 223, 221, 219 
DB 217, 215, 212, 210, 208, 205, 203, 200, 197, 195, 192, 189, 187, 184, 181, 178 
DB 175, 172, 169, 167, 164, 160, 157, 154, 151, 148, 145, 142, 139, 136, 133, 130 
DB 126, 123, 120, 117, 114, 111, 108, 105, 102, 99 , 96 , 92 , 89 , 87 , 84 , 81  
DB 78 , 75 , 72 , 69 , 67 , 64 , 61 , 59 , 56 , 53 , 51 , 48 , 46 , 44 , 41 , 39  
DB 37 , 35 , 33 , 31 , 29 , 27 , 25 , 23 , 21 , 20 , 18 , 16 , 15 , 14 , 12 , 11  
DB 10 , 9  , 8  , 7  , 6  , 5  , 4  , 4  , 3  , 3  , 2  , 2  , 1  , 1  , 1  , 0   
DB 0  , 1  , 1  , 1  , 2  , 2  , 3  , 3  , 4  , 5  , 5  , 6  , 7  , 8  , 9  , 10  
DB 12 , 13 , 14 , 16 , 17 , 19 , 20 , 22 , 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 
DB 40 , 42 , 45 , 47 , 50 , 52 , 55 , 57 , 60 , 62 , 65 , 68 , 71 , 74 , 76 , 79  
DB 82 , 85 , 88 , 91 , 94 , 97 , 100, 103, 106, 109, 112, 116, 119, 122, 125, 127 


end