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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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& G' H1 E4 _4 R6 I& ]( } Y #define uchar unsigned char
% I& |, N- n* m* E7 B/ x #define uint unsigned int( b# r( P4 v6 U" N1 N& p" h5 T
#include <reg52.h>
6 N2 v" l2 B: U #include <stdio.h>, Q: n( i0 q' `0 Q" W; ^; k
#include <absacc.h>
+ f y$ \* _$ v- h, W sbit scl=P3^5; //24c02 SCL& \* m' O6 c# e4 k. Y# o! K" g4 H8 S
sbit sda=P3^4; //24c02 SDA
# q$ t' Y9 D& X- ?' ~ sbit DOG=P1^7; //狗& l1 s o, U7 @! i& p( g+ q4 _
uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据/ I/ i) j; `9 t/ A
void x24c02_write(uchar address,uchar info); + M0 o- m9 B: F5 A
//向24c02的address地址中写入一字节数据info) \) H+ T) E6 E* i
void x24c02_init(); //24c02初始化子程序
, j3 z0 g( I8 S! x2 k9 q' }2 @4 | void delay1(uchar x);
1 ]' s2 L+ _: \# }) j& [ void flash();
! N! l* f* f# {4 B' ?; K void x24c01_init();
0 f0 W2 U! L7 ^: y void start();- l, c) ^0 O7 L) Y4 b
void stop();
8 @5 f6 C% D; K. g void writex(uchar j);/ M$ x6 H% L8 M/ A" Z8 _+ z4 `
uchar readx();
) ~# L* M7 _7 n: T; f void clock();0 a6 R5 ~# m& K% J- ^9 s3 K! m
void delay1(uchar x)
! T3 T! u0 J( W: ] {
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for(i=0;i<x;i++);
8 q2 H( u' h% p$ ^8 D8 U DOG=~DOG;
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# g$ u& L2 }0 Y" ~9 u. Q# u void flash()
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uchar u;
7 K% f/ r7 T3 Y2 L' X; ` DOG=~DOG;: _* E% s# a3 w5 c1 f7 F4 ~
}
. Z( x/ I5 w0 C& {1 n- \4 D void x24c02_init()
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scl=1; flash(); sda=1; flash();
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void start()
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();* b/ z* F4 G% G
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void stop()2 |3 e2 J: I; t0 `6 c/ S
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sda=0; flash(); scl=1; flash(); sda=1; flash();0 }* T5 @$ y( e0 `4 {$ f2 B# |
}
1 T1 p8 @6 g' P0 \9 y void writex(uchar j)
! \/ o, L; b- z2 ]8 p. ^ {
8 A! k# z" [3 Z uchar i,temp;6 F- @. N+ I0 T6 S
temp=j;7 e4 g5 d# R2 L3 h3 H; }' L
for (i=0;i<8;i++){$ B; J7 e3 l2 S* g
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1;
1 ~" r2 G1 n6 L" m: q7 |, W flash();
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6 \0 }- e5 u% K. b! V( C7 w/ m% P scl=0; flash(); sda=1; flash(); i8 W C. E2 r! H
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uchar readx()
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4 s: z3 y' }6 T' |. u uchar i,j,k=0;
7 @+ }( ~8 h& J1 X) y& b scl=0; flash(); sda=1;. {2 A, C3 r4 h5 j: S" d
for (i=0;i<8;i++){
3 O) T# a, ]$ b0 A" m flash(); scl=1; flash();8 ^# J7 w" l$ Y# M! I
if (sda==1) j=1;/ y6 B% h/ S+ {& ~. i
else j=0;: a+ J; m W2 I9 l+ @
k=(k<<1)|j; scl=0;
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flash(); return(k);' z5 z+ p& K) O7 @" y' ^( f
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void clock()
. V2 [ j3 G/ @. z! b' c# g1 H {
0 W( @" [- a. a* C: B7 `! I9 J1 _ uchar i=0;3 ] r/ ^, S1 s" r# K/ V
scl=1; flash();
7 F0 `& w$ D# n& e; r: k) Y# ]6 m while ((sda==1)&&(i<255))i++;
% i$ c2 Y8 z' B scl=0; flash();- W( }# F3 J% a0 f* f6 W7 N3 T. z
}
8 V$ U& y$ I# T# T9 A uchar x24c02_read(uchar address)
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uchar i;
8 M. Z( `* {- i6 d start(); writex(0xa0);
! N8 {% W6 s3 T6 a clock(); writex(address);
, k, h3 L& V2 |# ?0 g* n clock(); start();* i7 {* i- U: ^
writex(0xa1); clock();) w6 y& ]* k" V/ n5 t
i=readx(); stop();4 [6 X. Z9 Q3 x# @
delay1(10);. Q' J& o: s3 N
return(i);
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8 U& }; n! L. W9 N: _: c+ d+ A void x24c02_write(uchar address,uchar info)( L: @/ w$ c# Y, J5 k& N6 e( x! \! h
{
1 U7 q, I! N7 A7 h$ N% z$ k EA=0;
0 Y0 G1 e) h. [6 R start(); writex(0xa0);3 b1 J* s; V' S/ u
clock(); writex(address);3 J9 r- F* K; N
clock(); writex(info);
" k: H( r4 |& v& T: s) o9 ~ clock(); stop();
$ p# k2 H, j9 Y) \ EA=1;
$ E" r& m: z. z, x0 W, x' _ delay1(50);2 T3 U/ Q6 o$ V7 a2 { t& B
} |
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