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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：' d3 t8 c T* b0 ^+ X* u
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, I$ l v8 o2 g$ H4 `6 i #define uchar unsigned char- V9 c& q$ b! t9 i8 X
#define uint unsigned int/ q5 O5 o# T0 m1 _' n% d
#include <reg52.h>1 U& T, G! p, C1 r% x( `- ^+ \
#include <stdio.h>
- ~" L- u. Y; n #include <absacc.h>4 [ S: A1 C5 o; G& x1 x
sbit scl=P3^5; //24c02 SCL3 z5 i- `! ~1 @! q2 J: ?9 \2 D
sbit sda=P3^4; //24c02 SDA
3 F) I# v- O) S8 B sbit DOG=P1^7; //狗
5 u! T6 d8 K3 G uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据7 a4 Z5 _+ r; J9 N
void x24c02_write(uchar address,uchar info);
: t$ _, O$ t) y //向24c02的address地址中写入一字节数据info
% s. I4 C& N0 ^3 H- B% _9 J void x24c02_init(); //24c02初始化子程序
" _/ r% f. k. L7 C- p void delay1(uchar x);9 X4 X% z8 Q" C5 u
void flash();3 s4 o/ I0 l0 i. u& N! w5 F; k
void x24c01_init();4 Y- D& Q! t" C: u! c9 E" }# p6 H
void start();
" _' C. ^) R. L. r, Z0 I2 U void stop();, H+ e% @ j4 y
void writex(uchar j);
* k+ x' l- \: b6 z uchar readx();
7 e4 x' _7 u, u! b; u void clock();
) R: Y! c" W( b& C& ? void delay1(uchar x)
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uint i;4 j( p) Y% b) o2 s
for(i=0;i<x;i++);1 W8 B7 Z" D& Z: i* Y/ `: N
DOG=~DOG;2 w: y* p+ k, X2 h; w, l6 {/ X
}
, L) o" Q+ O$ F void flash()
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uchar u;! p$ ?( L; H: ?" X
DOG=~DOG;
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* g k G( m' P void x24c02_init()6 {5 R: r+ E. U8 l' z
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scl=1; flash(); sda=1; flash();
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void start()' ]: a* Y9 e# b, b: j
{
" z4 J( }: m7 `. D' X sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
s1 T6 J6 i: T1 \$ Z7 b }
- c0 ^8 w- Y& H9 m7 \3 @1 L9 n void stop()
. H. d5 Q8 k, {) [ {
1 y% U5 `& J0 h) U+ F sda=0; flash(); scl=1; flash(); sda=1; flash();
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4 b# N ]4 z( w9 K- s void writex(uchar j), p/ D4 k# w0 R' y- F1 V: e
{
: a4 g) E F. x/ v: E' C- _ uchar i,temp;
/ P4 _- P: _! K6 B# e temp=j;% n s" X2 B. s
for (i=0;i<8;i++){
6 `. A' u4 m/ [- Q temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; 0 ]% b1 c% {" r/ K
flash();8 j Q0 s- {& e
}
5 g/ z- Z! l" l scl=0; flash(); sda=1; flash();
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uchar readx()
+ d0 M+ I1 y! ]/ m {
* X. e; k( x6 R$ _6 Q' J z# `- ]/ ? uchar i,j,k=0;
1 t; P* ^9 e) Z; |6 i! P2 K: p5 Q( ~6 | scl=0; flash(); sda=1;
2 t3 v1 U8 W2 n for (i=0;i<8;i++){
; ~0 y2 P' m4 Q flash(); scl=1; flash();
% }% x% v4 o5 }7 ?2 a1 r+ ^% g9 B if (sda==1) j=1;
" P5 t. g) @* @1 Z5 A) O6 N+ M! z else j=0;
" ^. B* p k* ` k=(k<<1)|j; scl=0;7 m1 O. U5 P$ R; L2 t* |
}
- C% w' i" [4 p) p3 N! Y6 e, p flash(); return(k);
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void clock()
9 j3 v5 X, K8 s; K {
0 o( I6 T1 b! h9 @ uchar i=0;4 b% m6 S9 L J& ?
scl=1; flash();
- W, B/ \, J5 [8 `! p while ((sda==1)&&(i<255))i++;; _9 D: z3 v, d: t* S" L
scl=0; flash();% H) ^7 j3 z: c U C$ Z' B
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uchar x24c02_read(uchar address)
2 w6 c1 v1 p* s h( O+ g {
9 P3 ]# W3 }3 D% ^ uchar i;
0 {% U! E7 m- G6 S& E" ?; l start(); writex(0xa0);
( S" V; s M2 b+ f clock(); writex(address);( {" u' u: e8 X) t9 ]" B
clock(); start();
! g/ U# K6 n) y- P& S% Z K writex(0xa1); clock();! s w7 H+ }! c1 X! U# s
i=readx(); stop();
, J. ~- ?; w+ I/ J4 d, M: z4 R% b delay1(10);9 f1 I4 J' g% \
return(i);* F8 o9 E7 U% V' q6 B
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void x24c02_write(uchar address,uchar info)
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EA=0;4 t P, Y( n( l- F/ l
start(); writex(0xa0);9 V& P! L) l3 d5 V4 q
clock(); writex(address);
1 L8 M, V- t1 T0 q clock(); writex(info);4 m9 l0 W6 J" `- m6 m) @ H
clock(); stop();
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delay1(50);
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