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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:% o# v$ R! t9 m; h# C
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#define uchar unsigned char. O/ {% A- @9 F) E5 f5 d: I! L6 V- X
#define uint unsigned int& D2 S& L2 \4 H
#include <reg52.h>
& s( J# O! I2 E3 l) A #include <stdio.h>
) K$ \- R' X0 C0 m6 N #include <absacc.h>1 g% X! S, n" Q( b+ S0 ?( d3 b
sbit scl=P3^5; //24c02 SCL
$ t! ]: L8 h( f sbit sda=P3^4; //24c02 SDA+ D% ]3 s+ f! R% l* j; k/ h& k' C
sbit DOG=P1^7; //狗
: v K9 C5 ~% ^ uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据+ O. G2 t3 K9 Y! g
void x24c02_write(uchar address,uchar info);
' ~# ~( o- l. f. c& ` //向24c02的address地址中写入一字节数据info
; V0 k7 E) t B/ j+ k9 |% @ void x24c02_init(); //24c02初始化子程序' u" _% ~; S+ q9 a j/ }
void delay1(uchar x);" {* t6 g1 c8 i# N: L
void flash();+ L5 P. K8 P6 h$ G5 @8 L$ o/ a
void x24c01_init();
& h. V; A+ M" f6 Z8 d H3 o void start();$ r1 Y- V6 S5 C8 x
void stop();
) [% Q( Y: {4 B2 o+ Y void writex(uchar j);, ?; i( V; X- p: e7 j# q
uchar readx();
5 ^9 P9 i p, j; P: d7 N void clock();9 Y4 l3 M8 i% {* L0 P' a7 j8 _
void delay1(uchar x)
$ Z0 [! b/ d0 v/ W* V {
$ k6 B4 u" @- n, w% N uint i;/ F3 C2 j& C, q$ j
for(i=0;i<x;i++);
- D0 R6 p4 X+ s8 C. `2 f( H DOG=~DOG;+ w P, R5 n7 t* I2 d0 l
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void flash()& E7 k5 j( Z" h# [, f4 O4 F/ Y7 A# I
{
, @9 {6 [2 |& E- |9 P8 k! x. r) x uchar u;! t1 b, M- g y' c* |7 O+ ]
DOG=~DOG;
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void x24c02_init()3 Y- T% s& G) f. B, B9 K
{
; G/ _' U2 N4 F6 ? scl=1; flash(); sda=1; flash();9 q( F) P1 ^4 l, `+ m
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void start()
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9 ]+ t7 `+ O) E: k! ]/ {# ^ sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();( K3 O- ^5 ?' a) U. l2 D
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void stop()5 y5 H2 G5 ~8 I
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sda=0; flash(); scl=1; flash(); sda=1; flash();2 a0 e8 p3 W j
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void writex(uchar j)
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uchar i,temp;
1 d* L) P# k9 I% o1 p9 J& V temp=j;2 V5 E2 x2 A6 \4 f/ p6 t# \6 ?' n- u
for (i=0;i<8;i++){0 e" e3 p) n' \* n/ j5 N$ \# K
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1;
1 e! |% d" v, V! n flash();' W# A$ o; d8 _4 ]
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scl=0; flash(); sda=1; flash();
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6 t( z- C- i8 G2 Z, m! F uchar readx()( I% k6 A1 V5 u, l
{
4 w; \4 @$ d1 m1 J uchar i,j,k=0;
& `8 V5 h) D5 C8 l scl=0; flash(); sda=1;
9 S7 P9 f& b/ C$ B; c for (i=0;i<8;i++){- v3 {( M# r5 g
flash(); scl=1; flash();/ y$ L' B# Q9 d/ I7 C* B+ Y8 e
if (sda==1) j=1;
) y9 R( \. f! H else j=0;
6 z) |( i6 [- Z7 y0 u0 F k=(k<<1)|j; scl=0;
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. r& K( y( W: D; L9 W! s' } flash(); return(k);
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void clock()5 l7 E# m. x1 d5 c
{; R+ n+ \5 d4 [; s- u% {
uchar i=0;
) ^" f2 ~' O; G, c scl=1; flash();
* v+ _! t: Y2 Z4 V: C while ((sda==1)&&(i<255))i++;
2 d" {0 B% f f$ O! M0 ~; b scl=0; flash();
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uchar x24c02_read(uchar address)
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0 K+ R& x; a# U uchar i;* T; ?( u4 \2 L' x( t
start(); writex(0xa0);1 _4 `8 X/ N- V; m
clock(); writex(address);
7 }0 y# t" h. Z# i( D( q, W& Y clock(); start();: V g6 A$ p1 I) B; b
writex(0xa1); clock();
, ^9 l9 m2 B- ]. d1 j B i=readx(); stop();7 S! A; q; l2 O& O" q
delay1(10);$ c f* I; t* B; `% v0 d
return(i);8 ^9 T+ z# B2 L% i
}
' L) o( b L# Q; g6 P& t+ a void x24c02_write(uchar address,uchar info)* m& s1 j( ?5 r
{
7 o( m# x' X# U& P& J z" j1 ?( H EA=0;
8 H' Z% T0 m9 p/ f% @ start(); writex(0xa0);1 I( W; [5 t7 [2 p6 h0 E
clock(); writex(address);' o! x' I9 B7 E3 x
clock(); writex(info);
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EA=1;
, m8 L% c4 s! {' Y delay1(50);1 L6 C7 _. c& N: ^$ [% a
} |
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