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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：
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6 s9 T; Q; @5 P& e* K #define uchar unsigned char. z$ \' }- h5 F% m
#define uint unsigned int
4 \9 F B+ E) `. \5 M/ `* c( n' d! v #include <reg52.h>+ l* K1 F, X* \2 s
#include <stdio.h>2 E9 W. h0 [7 Z
#include <absacc.h>
: p/ _) t. I6 l4 w sbit scl=P3^5; //24c02 SCL
, s' P# x. ^: q: u$ [1 J( ~ sbit sda=P3^4; //24c02 SDA
) O- Z" b! G) d( o( @ sbit DOG=P1^7; //狗6 q8 Y! s% @& {8 M" v
uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据! `$ {6 [, e0 W: M$ J8 L7 u! c
void x24c02_write(uchar address,uchar info);
+ v; v7 f8 z9 E //向24c02的address地址中写入一字节数据info
6 E3 Y" e) L* } void x24c02_init(); //24c02初始化子程序. H7 h0 r5 k9 h7 t$ L2 _' A4 N
void delay1(uchar x);
5 |, b$ j) _4 a1 |0 t void flash();
' N: s- c* L$ ~3 _' }/ t void x24c01_init();2 F# m) p& r8 O) F g8 T4 E
void start();
3 G r- [" N! {; t# m$ P+ I void stop();- d) J- ]. A: P: h* X6 f
void writex(uchar j);
4 X1 Z0 B# [ _ }+ K1 q7 q( x uchar readx();( U1 F8 F. J- H1 c7 |( [) \
void clock();/ X; b# U5 |6 i6 c6 N
void delay1(uchar x)' Y( T ~" o7 ~/ M
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uint i;0 a; e8 V% H. a0 R6 s9 {: I
for(i=0;i<x;i++);1 T# O* [. U& ]% [/ I: p+ ?
DOG=~DOG;/ O& J$ ?1 P! b* j. h
}
/ u* p2 G7 R( N J3 b. X/ g void flash()
( S7 V* O: H8 D+ [$ p {
8 a a( y+ v- n) a2 f uchar u;
2 ? i1 H+ M' } DOG=~DOG;
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void x24c02_init()" h' ~, E7 H6 J
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scl=1; flash(); sda=1; flash(); W D6 x/ U* g$ X
}
$ g. _% F3 G/ s0 U2 b void start()" F+ ]4 y1 g+ [
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
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void stop()
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* i' F* I1 I' Z sda=0; flash(); scl=1; flash(); sda=1; flash();3 a V0 D7 B0 I& [5 x
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void writex(uchar j)
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( S7 R0 {/ L' z2 Q uchar i,temp;
# L# ?6 l: y8 u temp=j;
9 @* J* m/ R0 u' O2 ~% `3 g for (i=0;i<8;i++){# q, q- p9 N+ V3 ~8 y& x" b
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; / r& Q* E' G# F( e
flash();" ?. N4 Z0 a9 ]# O! E9 J( U! d n
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scl=0; flash(); sda=1; flash();
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uchar readx(): t) X% u: @! L R* M
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uchar i,j,k=0;! {- O: ~; e% B( u! g
scl=0; flash(); sda=1;0 r v) W! k; j2 k1 G9 y* x; [% ]
for (i=0;i<8;i++){0 ~+ A! A% C7 E3 e5 H8 ?
flash(); scl=1; flash();5 F$ F& N- x) z# [9 c! U
if (sda==1) j=1;
! R1 n$ ~6 C9 C+ T else j=0;
% l+ R8 W- M' s k=(k<<1)|j; scl=0;1 x; P0 A* r8 b8 B7 }0 E1 Z
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flash(); return(k);
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, ^' s) f6 D: u& [ void clock()
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5 e$ D9 O$ r/ ]9 B" u uchar i=0;& `9 o0 g! S1 u5 K
scl=1; flash();: Y. m3 m X3 Q, S
while ((sda==1)&&(i<255))i++;. B1 @$ y' P% M. b2 j, u, b
scl=0; flash();
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! `3 ^! N# {. |+ E" }& q, l uchar x24c02_read(uchar address)
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uchar i;
- [) A' a/ F' |$ J K4 D, w start(); writex(0xa0);
, \. @/ c5 y& Q( F3 p2 } clock(); writex(address); u1 w7 u4 V8 e% S# ^
clock(); start();6 n! v" N, {# E/ S
writex(0xa1); clock();
% V1 \; o6 ]; x2 r* _! r i=readx(); stop();
- \3 e7 J5 E3 l1 Y% x delay1(10);
0 h/ ]( y$ S& I# n: S7 q return(i);
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void x24c02_write(uchar address,uchar info)8 p6 ?4 ]% W( O3 A& C9 L3 d4 z
{
$ Q* q7 B H& [1 N+ J( x1 T EA=0;0 G) l p% R9 t0 Y
start(); writex(0xa0);/ l1 |+ y$ [0 p t7 Z$ M1 g! P
clock(); writex(address);; k3 v# \/ `! f$ w7 k5 [( ~/ `5 R
clock(); writex(info);: l, ~* m- G' h3 y& a# E* Q
clock(); stop(); P+ |2 a! p/ v q6 K! _) h
EA=1;
* a2 B+ z; }( y delay1(50);
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