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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：$ E2 u! }/ V* l/ P( K+ u7 m4 }
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#define uchar unsigned char: s8 v0 T/ a J2 q- [
#define uint unsigned int
& E$ C8 P( O9 B2 D9 F; p #include <reg52.h>6 G. G1 y7 g' j9 B
#include <stdio.h>
0 U! S/ c5 j7 e5 X #include <absacc.h>5 C S$ U5 }& P9 X2 m+ k! a i9 ^
sbit scl=P3^5; //24c02 SCL V- |6 Q( `# d. n
sbit sda=P3^4; //24c02 SDA
' r% v2 p' Q, Z, ?+ n, d* Q0 q sbit DOG=P1^7; //狗
2 S4 S9 Y; L( D; z/ @) P, L: g uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
9 P* c* S! t$ M4 a# r G( g. B. q void x24c02_write(uchar address,uchar info);
6 c C' u4 K' C8 L //向24c02的address地址中写入一字节数据info
% w Q' U. _+ q5 f! s7 O' ~% s# a void x24c02_init(); //24c02初始化子程序
! Y$ f8 [2 U8 c& E9 Q void delay1(uchar x);1 ]% `# m! D7 [) Y- n, }! i
void flash();( ]* \5 @/ ~& F; s& f
void x24c01_init();; i7 q+ {- E' B! r7 J) A
void start();6 I: N% E* Q8 a6 B
void stop();
: P1 X' x6 E( n# c4 I void writex(uchar j);/ m; b5 c9 H: w: Y+ ^* W$ s
uchar readx();8 h( l6 ^5 p8 n: e* H+ B) _/ w2 x! J! F
void clock();9 k/ R9 A7 J$ m& }( }
void delay1(uchar x)9 Z1 ]7 M# [/ V) S1 J9 Q+ W' J
{) ]" {5 H x( |3 E8 C$ N6 h
uint i;
/ I; W: _* U. v1 O6 z1 z6 o- D) u/ D for(i=0;i<x;i++); V- C" J7 i3 \$ ]
DOG=~DOG;
5 K' [/ C1 P# b6 \ }
0 k9 {5 x [! q, L void flash()
: v) S% \7 g2 f$ r {
& [: V% b- y: @ uchar u;0 v7 a- J4 B, k+ a+ i
DOG=~DOG;6 j9 F! g/ h4 u# N
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void x24c02_init()
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scl=1; flash(); sda=1; flash();! }3 s! j: X& o- U4 \
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void start()
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();+ }) @* p! i- v! D8 _! ~; \/ j- m4 K
}
. J$ O$ {2 E+ i3 E' R' `: r! C/ Q void stop()1 D0 t/ Y/ e2 G7 @3 L
{
7 f: g5 j& b3 G! Y8 c& W) H9 ] sda=0; flash(); scl=1; flash(); sda=1; flash();/ N8 d v8 N M
}' {* r' L0 ~- [) [& T) e8 T
void writex(uchar j)+ P9 T* z H' Z2 q+ T7 S
{
8 z1 u. D" z8 B% p% d+ k# n uchar i,temp;
4 T X8 Q. T* {" Y3 e M. H8 B; q temp=j;
: i& v3 v) h- k$ U0 t for (i=0;i<8;i++){2 t2 r4 y. Z5 m. ]
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; # d3 e7 h& v3 g) t& \) N" W
flash(); k% O* O1 S, Z! o
}
2 e/ `5 j- ~, x. [+ ~) k) {/ @* D scl=0; flash(); sda=1; flash();
/ f' j! x% ]( K }
& l0 K7 K& c2 z" e3 ^ uchar readx()
8 F! D( k# Q# M: J8 H6 O+ o: h {
7 d" N, k6 ?7 b4 {0 N6 J2 g uchar i,j,k=0;0 O( i. {# ?7 ]5 @4 l
scl=0; flash(); sda=1;
b% \$ }# y D0 K" T for (i=0;i<8;i++){
) E* V- O% ?/ Q flash(); scl=1; flash();
. H p% \) ~ b% X& Q7 B ?5 P if (sda==1) j=1;
* i1 I6 l- [, x, i; J1 j else j=0;- ^' g( b; m, [3 D
k=(k<<1)|j; scl=0;
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flash(); return(k);& H% \0 ^/ g6 z; q1 P2 L' ]0 C- `
}7 L: H1 l% N/ l
void clock()* s1 b7 _( u" J2 v1 ^$ S* r& c
{
4 E: n" H7 t& A8 ?8 H6 L0 e4 ~, { uchar i=0;
4 }* D# c% m' U, _ scl=1; flash();
1 a* Q" N# s4 O while ((sda==1)&&(i<255))i++;! I6 [$ o' W, S0 ?* g$ f; m
scl=0; flash();
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uchar x24c02_read(uchar address): y& I+ L; z# y+ o
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uchar i;
" d7 }1 A4 ~- o% Y( [9 ? start(); writex(0xa0);
. ~, [, r W" R clock(); writex(address);3 J, j$ f" |: N: ]$ @. |
clock(); start(); \, G) r- Z, ~) e$ N, Y. p0 s
writex(0xa1); clock();( i* M& @! V0 m" G5 @
i=readx(); stop();
7 d+ h( [' g% E" U& G delay1(10);
% s+ X4 }3 E/ C! F& ]$ J return(i);
4 V# ^9 }% S) i b }
4 h" L, U5 Z& K7 I3 C' K void x24c02_write(uchar address,uchar info)' F% E! I# _5 H: B
{
E. V2 }, V- z3 c. R EA=0;
" u% \0 n- y1 { start(); writex(0xa0); S- r9 {3 n9 G1 ?( k& m1 L1 ^; ?* y7 P# M
clock(); writex(address);
& O1 S; x& L9 {& S a1 o clock(); writex(info);! F. z+ _. T+ C# ]5 E
clock(); stop();
1 r# Q& i: \) O% ~* ~9 Q EA=1;
" w7 R# T3 ]5 U3 u3 j delay1(50);
0 S& h: x" i8 l5 h$ ]9 } } |
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