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#include<reg51.h>- x! z& B+ G/ B" Q
#define uchar unsigned char
+ o5 V* M& w+ S, n8 ~#define uint unsigned int
9 V- N9 m( T9 X2 }/ A0 ]sbit CLK=P2^4;1 U z+ E2 O+ J \( D6 z
sbit ST=P2^5;
7 N+ e0 A6 x6 T! Y! @- {! r! _4 u9 Xsbit EOC=P2^6;* w; g1 p! J% }8 \" E4 `, R: i `' z
sbit OE=P2^7;5 d3 A4 U) n) Y1 H+ p2 u
sbit PWM=P3^0;
8 t: g7 g! Y8 }( {7 U
: r% u, H4 ^% u g& T8 t9 v' c& nvoid DelayMS(uint ms), E/ X, y. z& a `; D4 y7 R
{+ u0 k8 h, p, B$ E @: d
uchar i;" _' B3 F: ?* p* ~: k: b* R
while(ms--) for(i=0;i<40;i++);9 }9 M4 R, I/ w. u# E) T
}3 t" f1 E; W N1 t
, w3 f3 F" r* { Xvoid main(): e% k# S4 n& X# ?0 A' m
{8 s/ j+ I) g* x1 }) f
uchar Va1;
. P3 L c. x0 B; o; A; S( kTMOD=0x02;
' x9 T2 m; W8 S! I" d7 N! gTH0=0x14;$ k8 n0 T8 w8 u+ V
TL0=0x00;
. M8 D' p1 ]. f3 }# X: S; @8 u7 s4 UIE=0x82;
5 F- o9 K, ~- h5 q" U+ J& ATR0=1;
& G, \" `: {% N* a0 h. r: U. ~while(1), d6 Q$ f" T" u) L0 r& o$ b
{
. e& T* @. Y$ D5 xST=0;ST=1;ST=0;3 m# E9 J+ P9 ?& K, Z0 o# Z5 w
while(!EOC);
4 I- f- y/ b' c. @9 s& |OE=1;
, ~* k3 b7 K$ n! m( n' RVa1=p1;8 o# ~: V( Q D! Q( f* l0 C9 f
OE=0;
: u& g6 e5 L4 h+ @/ fif(Va1==0)
6 o6 o/ c5 ?) u4 f{% Y( J% G( X( G$ {+ w
PWM=0;
8 m, v' x; i5 ~if(Va1==0xff);
& \- C6 F' o3 I9 h+ xcontinue;. k% N" j& p6 f _& S
}4 h) J+ }+ G# V( L. Y
if(Va1==0xff)
' s& z( R$ f, H& L( C{
* ^# N9 z7 Y. G' o- `0 V; VPWM=1;% X f3 H# j$ X5 H9 y5 ]8 A% _
DelayMS(0xfff);
# b. q: ?, s; k7 `2 b% bcontinue;/ ]) G4 i. z8 {% {. A
} s, g- u$ U m2 y1 b
PWM=1;$ y) k* f8 E2 B' x6 h6 ~
DelayMS(Va1);8 x3 c; i( R/ K2 z: W; H0 B, `+ w
PWM=0;4 N/ @& [' o$ x
DelayMS(0xff-Val);
% L. |3 t3 t8 a}5 p% c+ T$ O+ h* @
}
* E/ V0 d' T. X8 ^
' p. x, R3 ^7 `void Timer0_INT() interrupt 1
/ K6 q" a/ c6 a1 p( {{
/ m3 D" t3 ~1 w9 z4 E: i/ l/ B% sCLK=~CLK;) n. l }0 A8 ?) i. Y
}+ H. y$ F1 k+ I% L6 r5 A9 y# x9 R
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发表于 2022-6-21 09:48
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