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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:; \3 o2 L3 t+ J0 k; K3 E
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1 j \: _0 s1 e4 i- j #define uchar unsigned char
0 e" ?4 N1 q+ B) {) O) t% N #define uint unsigned int, e! `' `& b9 o0 o. A
#include <reg52.h>. ^: n4 j( A, l, l$ f5 V6 y
#include <stdio.h>
+ H$ U" t' L; @) p$ d" i" a o #include <absacc.h>
|* P* {# Q; M9 z" A sbit scl=P3^5; //24c02 SCL
3 ?+ D# K0 J0 ^! P7 O/ U" y" m3 q sbit sda=P3^4; //24c02 SDA( P4 M' q! W* S" D* U4 J: S- U
sbit DOG=P1^7; //狗
^4 Z& |! n+ W uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
" C6 D. n( p6 D void x24c02_write(uchar address,uchar info); ! g* ^; S0 D7 L6 [
//向24c02的address地址中写入一字节数据info
& D8 q. o0 \6 R void x24c02_init(); //24c02初始化子程序
( E# M6 P) ]: u9 p/ N6 R& H; N void delay1(uchar x);
- D4 Q) \) H" F void flash();
$ e$ E) V4 f3 Q7 _: f$ X) f4 P void x24c01_init();, q2 a3 a" v3 c7 D- z2 X* O$ \, g! z
void start();! h" k, @+ r: j8 i' ~
void stop();! q6 o- b X8 _* K1 `
void writex(uchar j);' v, o. p8 ?9 K% ]
uchar readx();
% R7 A$ {% o& ^/ j void clock();7 O: b* \4 x7 b9 U4 S8 V* \
void delay1(uchar x)8 Z) s3 N* x7 Q# j$ P+ I0 }
{
3 e/ p$ j K+ V- ]0 x$ ] uint i;; ], G4 s( N3 c9 {# S
for(i=0;i<x;i++);
W, q7 w2 `: O h DOG=~DOG;+ k j- V2 N. h# K. S, H' ^" b
}
|' D- I5 n% {$ ]( w void flash()
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uchar u;
$ \% L- W2 ?% b1 M: x2 b5 V. `" t DOG=~DOG;
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void x24c02_init()
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; _+ t. ^: @8 X+ j scl=1; flash(); sda=1; flash();0 x8 h; O/ j+ y' s
}
& \. u; S; a k void start()9 j8 n: C: `1 ~9 }5 r
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
+ W7 ]- d `+ I. R1 P+ B/ F; ? }
# q1 P' Y& x. r! B; R$ U7 { void stop()
* f% y c. x" a! q7 Y {
" o8 A& ~) X9 [/ `* ] sda=0; flash(); scl=1; flash(); sda=1; flash();& m1 O K1 D, z) H) c
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void writex(uchar j)
& R7 ]" y) R& `4 c: ?2 P$ B {
% f! a% _# ]& g4 K5 D9 s uchar i,temp;, I3 J$ _) F, w( M( X( j* d
temp=j;+ l! k8 S/ v( u+ g" m- L
for (i=0;i<8;i++){
9 [8 M2 W* | e# i- n0 g( l temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1;
9 R& n% h* K' F; Y& @5 ^ flash();
6 u& n& P; _6 A+ I# h, h- y }
. n# c; \6 m: {, ~, L scl=0; flash(); sda=1; flash();0 D5 w! }8 L/ R* O8 ^
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uchar readx()
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uchar i,j,k=0;
, o8 G8 ]9 S4 o$ C1 S scl=0; flash(); sda=1;
8 ?/ l7 }& b" }9 b3 B0 I! x2 ? for (i=0;i<8;i++){
% l( q. `, K( R' `6 y flash(); scl=1; flash();# G* o- f9 [! q
if (sda==1) j=1;! _4 U: U- H0 I, r
else j=0;
2 @7 D. j5 h4 w" P6 c k=(k<<1)|j; scl=0;
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flash(); return(k);1 o7 h% w* s" S* \
}
/ [ t* s* G' z) H, R* i' V void clock()9 c/ [! L/ Z# \4 O
{
9 {6 q; [/ [. H! Z/ q1 Q* W uchar i=0;1 O1 I; w/ ]8 Y8 x L
scl=1; flash();
0 @* M* {" X2 E while ((sda==1)&&(i<255))i++;
: Q' T, M8 s* K0 y* r' S3 c+ D( T scl=0; flash();
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uchar x24c02_read(uchar address)
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uchar i;
& D% f. x2 P' ], l start(); writex(0xa0);# W. N1 V/ l8 m2 z, z" ]
clock(); writex(address);% P8 E4 y% R, K E
clock(); start();
8 `5 ?) |: B8 r& t3 S6 l writex(0xa1); clock();$ [0 Q' a5 Y$ |
i=readx(); stop();! L1 u+ x+ N& B! d
delay1(10);: |0 u9 m& x) A/ B) x, Y
return(i);& k: f1 r1 r2 O! M4 i! d- E# F
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void x24c02_write(uchar address,uchar info)
" g% Q' i+ i9 T% Q, X+ W {
' K6 N3 P8 }9 r" o' o4 Z EA=0;; a- G4 Z# U/ `
start(); writex(0xa0);
/ g4 E' c. o5 A# L clock(); writex(address);/ _0 E& t* T ?5 v9 u
clock(); writex(info);6 z' H* B* J4 w2 O
clock(); stop();
' O( L2 H- B1 M" \6 c. S5 y EA=1;& [5 ]3 \; X4 L2 v, \' r, B! _
delay1(50);
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