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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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; k2 k/ l/ k. m% Y, M5 V; Q( i #define uchar unsigned char
+ n1 [; ~( Q# \- d" r2 q5 x6 w: K #define uint unsigned int0 j: i+ F; _2 _" ^3 ~ C
#include <reg52.h>
! U: {5 x& p: v! B0 U #include <stdio.h>- p) A$ p! b. {$ n, i
#include <absacc.h>6 q. l `5 I2 G, n6 F3 r
sbit scl=P3^5; //24c02 SCL+ [% E5 u' V- |" Z8 ^2 H
sbit sda=P3^4; //24c02 SDA
# g% ^$ {9 ^! T- v sbit DOG=P1^7; //狗
1 J, n: s' C# Y0 {2 f7 H0 ~/ p uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
$ q, _! d: B% T; h& ^. j void x24c02_write(uchar address,uchar info); 6 n( g. K9 i0 }3 c! \5 |6 W
//向24c02的address地址中写入一字节数据info9 E8 j6 L5 A# `- `
void x24c02_init(); //24c02初始化子程序4 e5 x6 b1 S4 M$ i. n+ S8 c
void delay1(uchar x);
$ _+ E5 o' a1 \" ~- N( w! } void flash(); p% ?8 R# J, H
void x24c01_init();
; d1 n5 d0 G v; M7 ]1 B void start();
; d3 S7 g/ L( t4 T c) b void stop();
9 l+ T2 U- r- g+ A3 ^ void writex(uchar j);4 k* r! \0 |7 h& p8 M, r+ e
uchar readx();! `9 C. ~, g5 G, D
void clock();
" Z6 {1 s5 N/ ?5 m" J void delay1(uchar x)5 f$ Z8 K9 O' e; ~ F) G! o
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uint i;
* ~* M8 G# ?6 P for(i=0;i<x;i++);* M" C8 d7 @1 t" x
DOG=~DOG;
* C2 M, k1 F) f6 K I, q }
; u, y( ^: c, G! D% |; Y+ K void flash()
/ b2 I" Y! n; S& s# x {
" o& O: P8 [5 D2 O! B6 t2 @ uchar u;
5 k" o9 Y6 ~; b. `# J DOG=~DOG;; r5 T# X P+ Z
}
7 G- u, Q% v" y$ _/ ` void x24c02_init()2 a$ o. u% Z6 z0 ?& h$ h5 S" j
{
( G: {6 W* a! p scl=1; flash(); sda=1; flash();
7 i: I0 z: Q) E. B }
- w9 u! X% Q& _8 R/ p) m void start()+ H9 }3 O& ?% H( a
{
2 `0 j) }" N+ w' V3 |! G; H. L) K sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
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4 | q1 i, K% G7 v" c i- H void stop()
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sda=0; flash(); scl=1; flash(); sda=1; flash();
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void writex(uchar j)
- h6 N( N$ F8 u. U {
! T4 c8 _& u f0 S uchar i,temp;
- d" g' b$ ^6 M4 w8 I temp=j; d% _8 H3 M1 f5 `
for (i=0;i<8;i++){
1 ]# W0 `2 A( q4 w temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1;
# a/ B+ @8 f1 _' I flash();
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# j9 A+ g. ^ r$ K2 J9 v scl=0; flash(); sda=1; flash();
8 D8 o7 i( z( U1 o }
7 _: j3 h2 ~. L uchar readx(); q( h% T9 _* u$ G9 y+ V
{
7 X( r. \' t, @$ a' U uchar i,j,k=0;
3 R+ Y! J7 q; b* } scl=0; flash(); sda=1;
' H) }' |' p( y for (i=0;i<8;i++){8 Y) a2 _: n# @/ t' r5 N/ F( K2 k2 v
flash(); scl=1; flash();1 V( I% |$ h3 `" z! W' c E) P1 O
if (sda==1) j=1;" f P/ c3 ]6 R
else j=0;: H, A5 h4 \9 N \1 u9 {
k=(k<<1)|j; scl=0;
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flash(); return(k);
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void clock()0 b. j( F }% p5 l
{
9 ~. G( A4 O; a1 B+ P uchar i=0;$ s$ @7 }+ r" O# j: b E( a# P+ d
scl=1; flash();! W- }+ j. _3 g1 @) K+ }
while ((sda==1)&&(i<255))i++;* {; _8 n9 e+ h
scl=0; flash();2 E/ P8 ^# y5 n( u' z
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uchar x24c02_read(uchar address)
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# r% y' e9 Z0 K" O uchar i;
% ?9 O5 l! I( a4 j" A/ o start(); writex(0xa0);
0 A1 a4 U* i5 E# a clock(); writex(address);7 B3 M+ V- f4 h1 W2 `! t
clock(); start();
( j0 l' J7 P' g6 I writex(0xa1); clock();3 T, [0 J" A8 T# X* h" N: B+ C, t
i=readx(); stop();# H4 r# B V7 P [) Q
delay1(10);( B4 U: q1 m8 _0 t+ o. W* E9 y+ ?' p
return(i);, [% S5 j( H/ l
}
8 P$ A, l1 s1 @, ^; q( A void x24c02_write(uchar address,uchar info)) f- I" X* n; U7 i
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EA=0;
! Y2 V( v5 K) j start(); writex(0xa0);% g% t+ Z4 R3 V o/ h1 E: ^7 D
clock(); writex(address);0 a% q/ H0 x' S/ O% [% f0 ^
clock(); writex(info);3 \$ G% n& F K5 A G
clock(); stop();# y/ l8 o2 M! h
EA=1;
( \" P, d8 C) _+ b0 a5 A; S: k delay1(50);
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