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求助:IIC总线的程序LED没反应 u ?8 R8 i0 {; I, ~1 o
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弄了一天还是没亮,求指导,到底哪有问题??
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* [' l6 z `; n% ]#include<reg52.h>. v9 W8 J7 V" y" a8 P! C& F- k5 P
#define uchar unsigned char
0 k/ y' N0 A/ R: s1 {6 P#define uint unsigned int
! s$ O" I$ X- X9 m rsbit sda=P2^0; 7 M& v" d! q3 ~2 B2 W
sbit scl=P2^1;
, ]% u7 S2 Y, ^0 [7 P( `& k: Q8 q* avoid delay()
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8 W# P! B" [1 {0 Fvoid delay1ms(uint z)
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. Z u4 O: v* Q& k% X6 I uint x,y;
& `$ C' d: z5 n. M for(x=z;x>0;x--)! V& p6 q: }' @, n2 F
for(y=110;y>0;y--);
2 S( d8 C" r* B; j" t1 @}
5 G. z( y L0 N4 z0 A- s3 [" S/ bvoid start() //开始信号; d9 E5 D% }+ w: w) X/ p" X- b6 K
{
# d1 b7 X1 ~" ^8 v, L; w( z0 O2 c. p( A- [ sda=1;
, o$ b5 b% U9 F5 j delay();
( o, j0 C8 e, Y9 B$ v6 n% G9 h scl=1;
+ l& m: {( j, a& |! H5 X' @6 `7 C# | delay();1 M9 s6 J7 L. i% O
sda=0;
6 ~4 |; w4 e. C- i7 J delay();
3 m, j: J& B/ @5 B}
4 J' _ o: [+ \4 O( Z8 J0 tvoid stop() //停止; [8 }& l: H# R; M
{
8 C7 j* I5 u8 Q/ V5 S sda=0;
# z3 j& a9 ~' ?" W( f3 f7 W delay();
1 X7 `! C, W8 l% e scl=1;- S/ _* z$ H- B: I6 H1 p
delay();
" c3 |' r; [" f& b' a5 _5 v& ? sda=1;
0 ]4 q8 q, h/ y2 M% R delay();
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void respons() //应答
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0 V8 z# i. w# K, w uchar i;5 E; Y- v% N* e" p+ F* E
scl=1; [- z4 J& l5 X& h2 i! e Q
delay();, W: d; ~. y- N7 U+ V( h8 c
while((sda==1)&&(i<250))i++;
9 o ?+ ~3 j3 r: C( O0 d" j$ b scl=0;# A% y, _( @0 n: [$ V
delay();! F' B: K" `; H. k3 f
}
; ^" O8 U' N Jvoid init() //初始化' z4 \4 t) I& u3 b' }+ s$ h) ]
{
1 `% N+ q& j' F1 @' s3 S' } sda=1;
- S7 j7 g8 p) m delay();( p. k4 y) q' J0 J- V5 x, v
scl=1;6 j1 i/ k/ l" P& |$ w1 Z ~) ?7 ^
delay();$ Y ^5 `7 J7 k/ w
}" p+ Y. J0 [# V" C% ~/ L" ^
void write_byte(uchar date) //写数据
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I" q9 U1 h6 t) |+ N) [ uchar i,temp;- m# p; V. K! p7 I) I& a) L/ t
temp=date;
2 g- _/ A5 g. h" O9 J8 |% f/ m- | for(i=0;i<8;i++)( z* i$ r& ~3 O4 }4 S
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temp=temp<<1;5 [3 @$ c- y- T' [# d' D [7 T
scl=0;' O" r5 P/ H+ h3 R I, P& S
delay();
4 s+ n8 F* a6 n7 n5 _: j sda=CY;: ]. X% L: r3 F$ u5 B, U3 p
delay();
; E$ M; K0 n9 [" @; f scl=1;) C! Z+ z6 A t
delay();( v* j+ d" A) Q$ n2 B
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scl=0;
* t+ Q8 U |6 J u: ~ delay();
2 o: L: ]2 J, C" k, m4 F sda=1;
, a3 o( u/ l1 I9 f) M7 P; `/ j0 R delay();" i! _7 o) }* r6 p+ k
}
( z3 H, h1 ~4 e4 |uchar read_byte() //读数据2 n2 F8 n f0 E
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uchar i,k;
' C4 w' O1 o! R a5 d+ K scl=0;
( C5 p# K4 P" y7 r5 L! V; E1 C delay();
: S7 h% S J9 m4 Y/ r' e sda=1;
- r; d. s+ x7 f" V$ x delay();9 Y# Z6 O1 I2 s3 c' K5 V' o
for(i=0;i<8;i++)
" }- A9 J3 H& O0 W8 n6 p" _0 R {
1 C" f6 x6 ?; u a scl=1;5 W# L/ Y( q% [" I
delay(); ' P- s$ i$ W7 v& v; t# q) N! [, n
k=(k<<1)|sda;* u- r4 P6 s5 B% |$ W
scl=0;
7 {+ O& U7 ?: F0 `9 c delay(); # x! L, a! a* u6 l) A) r
}
B- w6 e" `2 j: ~( d+ s return k;
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void write_add(uchar address,uchar date)7 J; ]# T! U* e- u0 \) I* O1 |
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start();
) r7 o, z* X6 ?4 u write_byte(0xa0);) O* k0 A6 ^- O3 H9 I
respons();, d4 }1 K' Y6 s5 t, U$ g. E) _& G) h3 u
write_byte(address);
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write_byte(date);
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stop();9 d/ n. n" ?2 _: ^% T9 h6 V
}
$ s# h3 a4 c5 q: m% @2 S) O9 ouchar read_add(uchar address)- j5 G" S# q% d, |5 J& m
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uchar date;
+ d) G ?9 E; t$ d* q n3 q start();
( R. o$ j1 j7 y8 `/ A& h* t write_byte(0xa0);; w$ o0 C" m) b4 {0 h' B5 \
respons();, c0 K% c6 Y: \$ K
write_byte(address);4 {, d; l. ~- J$ w ~' w
respons();
* t8 \; B% D; H4 r5 p start();$ W9 m, X# m0 f
write_byte(0xa1);
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date=read_byte();+ K; L H$ y; m {- u7 h
stop();2 V9 X1 f+ p, G v1 E9 F# y
return date;
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void main()
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% j% n0 T6 I2 S4 d* o# j init();
* s' k5 z" a6 a. }0 z6 t write_add(3,0xaa);* l5 {* R! C( {3 s1 |1 W: {
delay1ms(100);6 a% \' ^) l* x# d
P0=read_add(3);- Z* T8 [; C5 u) A' \
}
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