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发表于 2008-8-1 16:09:00
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来自: 中国河南新乡
就是啊,首先你要看懂I2C协议,在就是根据某个芯片,看一下控制程序就大概可以了!下面就是24C02的读写程序:) M$ m" ]' G4 M7 r( B/ E9 L0 \/ x
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* a1 x2 [1 t+ c* t: e# q) y #define uchar unsigned char3 A T" g }1 E( V# y0 D3 G
#define uint unsigned int
/ K: y* o2 p/ M6 [ #include <reg52.h>8 m. r& ?3 q+ j! x5 B" h
#include <stdio.h>
6 p, N" f: x& f9 o. J _& J #include <absacc.h>
- Q! i7 v ?. l7 f. E& [ sbit scl=P3^5; //24c02 SCL2 }: e- d1 C, t$ P7 S1 p' Q
sbit sda=P3^4; //24c02 SDA
% e1 w5 R0 w3 n% m sbit DOG=P1^7; //狗- a# W$ P3 q- G2 O
uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据, Q7 D; P5 W3 A* K
void x24c02_write(uchar address,uchar info); 2 A" b* I5 g2 j/ i, S
//向24c02的address地址中写入一字节数据info
4 m2 K; n+ N7 v2 n% |% N void x24c02_init(); //24c02初始化子程序* E7 p* T# S8 Y4 X
void delay1(uchar x);
7 j/ s3 N& ^" X5 w/ ]3 Q void flash();
9 @: g$ p$ A2 P0 C% @7 C9 G void x24c01_init();
$ s) g$ ]7 \6 q% W4 e7 Y% B void start();
5 r. b. i2 ^6 p5 K8 J; d2 w void stop();
- h- n0 @; g! K( o$ {) X void writex(uchar j);
* K# b& I$ M, h: y B f uchar readx();
& M! e5 Q% c! P2 z( i void clock();
2 w! m. n0 U* a* }1 Q0 o: L1 V) Q3 S void delay1(uchar x)% B: C$ @# `# j) B8 p% u
{
* {/ R0 ~5 K/ Z uint i;
% ?9 u( A) H1 }+ ]4 n0 H. c( R( k for(i=0;i<x;i++);
0 O. v. w' `3 a) I [. i% w! p DOG=~DOG;
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void flash()
. v9 C+ i# D9 @" P$ D {
: A! i/ N& q7 @+ @) N uchar u;
7 E$ j _7 m; n1 m2 n3 q, F, q DOG=~DOG;
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void x24c02_init()* ]0 j5 F! `3 a2 a
{
+ n8 u! Q# A) s4 E scl=1; flash(); sda=1; flash();8 ?- z7 C2 X$ K$ Z( K) q) f
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void start()2 p, |4 S8 ]. D7 @
{
# e0 o4 f0 o4 O- s sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();: A( u9 q5 x4 y/ ?
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void stop()( W. _ L5 m, D O& W
{) Y) m8 [; @% R& y* g) r# |" G5 {
sda=0; flash(); scl=1; flash(); sda=1; flash();
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void writex(uchar j)1 R+ s6 H6 ?5 T
{
. w% |9 S# f8 C* U5 ?* } uchar i,temp;; _( C! r0 v8 Q6 H9 O: {
temp=j;
, p* W5 o$ `$ s' F k& N+ J for (i=0;i<8;i++){ k9 {( J4 K. X0 O4 h
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; : D! H) g# `9 h% y6 G
flash();/ H7 U. C5 b% l
}
3 T! x6 R, |& y3 p scl=0; flash(); sda=1; flash();+ J3 o7 p2 n% ]! S1 U% \' C5 _5 S$ \
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uchar readx()
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uchar i,j,k=0;& t5 J8 h J m! z4 C1 O: Y5 q
scl=0; flash(); sda=1;
/ k5 K2 r* x' Q8 X" b! X for (i=0;i<8;i++){! X/ x; C- Q2 F) P* c* a$ _% Y
flash(); scl=1; flash();; A1 _# D' y3 J# o
if (sda==1) j=1;1 W8 I5 t1 ?9 f% X2 n
else j=0;9 y! a4 R- j% }9 u% O* W+ w9 D2 ?" B4 ]
k=(k<<1)|j; scl=0;
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flash(); return(k);
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void clock()
+ |" T( L: Z& f0 l# Z1 k1 u# h {
0 p4 A% ?+ n0 _3 m6 u uchar i=0;
/ _0 s4 E" v2 Q9 h) i7 Z6 f scl=1; flash();: [" m: @2 G" v2 ~: A
while ((sda==1)&&(i<255))i++;
A6 D$ W- C4 Q4 O! ` scl=0; flash();; }! F8 j/ f K$ w: `; U4 a7 s& i$ i
}
7 K) H3 M' m" }" o1 }* c" h i uchar x24c02_read(uchar address)6 c7 U$ \7 w0 \# [$ K- n: k
{
9 c8 |0 t7 y# q9 i- `+ N$ R uchar i;0 g) @/ Q. i( L( t: Z" r( q w$ \
start(); writex(0xa0);6 G$ t1 J' n& z& y& h8 @; |" l
clock(); writex(address);
+ w8 n6 w9 K8 P8 | clock(); start();
& U) F9 m2 ~. E. x9 j writex(0xa1); clock();) e9 m! \/ ?, o) ?
i=readx(); stop();
/ n, s" V" R0 ?8 t/ h7 A) L delay1(10);
8 t4 {' x* q! L* d' l4 Z( } return(i);) a" Z5 p% N# D7 W- B o
}
: i& ^4 t( i8 w void x24c02_write(uchar address,uchar info)
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9 h4 Z' u: O$ l; w& G( g6 F EA=0;, w0 U9 G1 I0 a" f+ s
start(); writex(0xa0);6 c* L3 L7 p3 L9 l( ]! P
clock(); writex(address);
9 W A# I b7 N. a) b4 M8 @ clock(); writex(info);. {# x) K+ Q* c0 y, c
clock(); stop();0 h$ }4 U5 ?' `4 G
EA=1;, t8 r4 f/ ~3 U
delay1(50);
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