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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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9 J! g- Y3 F! X, B7 g6 P" ]( t4 X #define uchar unsigned char5 ?6 f, n" b, Z
#define uint unsigned int
. v* Q7 i V0 n! w4 Y1 s$ m# z; {! g0 y #include <reg52.h>
& \+ ^* e7 V( u3 q/ @; Q #include <stdio.h>
! Z0 O% E- T+ E/ A9 P #include <absacc.h>/ H9 O! f7 {$ O! Y; o3 n" v1 p
sbit scl=P3^5; //24c02 SCL
: |" F: _+ W# F9 a. g B0 f sbit sda=P3^4; //24c02 SDA
: v6 |$ q4 K; Y. ~* d+ e& g sbit DOG=P1^7; //狗
9 G$ ]; ?* p2 L3 n) M/ }! \/ C uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据+ A9 I1 ]) S/ a0 y( A' h# }
void x24c02_write(uchar address,uchar info); 1 t: c& W% B( |& C
//向24c02的address地址中写入一字节数据info% {+ y1 v( f7 W7 I7 |
void x24c02_init(); //24c02初始化子程序% h9 Y6 }' t% c* M0 }" n" ~
void delay1(uchar x);/ f H) t; B4 c* }" }( w/ s
void flash();, e+ l* J9 ^7 I& d) ~0 m
void x24c01_init();
, T0 [1 N4 t! n. A7 ?& B( T void start();8 x! z5 T+ @' B+ m: F
void stop();+ N) G/ k, F0 A, N$ J+ S
void writex(uchar j);
, M/ I7 ^3 y/ u' T" _) W uchar readx();* B6 N8 o6 L1 A! a
void clock();2 ~: M: L( b o+ N w
void delay1(uchar x)
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uint i;4 @5 T" j0 n- b
for(i=0;i<x;i++);" k+ R. K# A: K" T" D5 u
DOG=~DOG;
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void flash()
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/ H0 O4 b# m9 X3 X4 m uchar u;. p) m0 l' B: H9 |% F4 H) a
DOG=~DOG;! \& K, c5 N& r6 |
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void x24c02_init(). f! p( \# e; z7 O! K f
{
7 d N: a2 ~- v- K9 E+ l+ y scl=1; flash(); sda=1; flash();
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void start()& X1 i8 i3 s. O
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();7 A/ b8 R0 m1 M+ D
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void stop()
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sda=0; flash(); scl=1; flash(); sda=1; flash();
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/ X- o3 c' G3 m) A" M void writex(uchar j)
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uchar i,temp;3 O" k7 i) y/ ~# e$ w; ~
temp=j;6 g3 v" D( C2 d
for (i=0;i<8;i++){
^& w! h/ t4 w9 X temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; ( n: a) a/ l U) N5 {; j u, ?
flash();
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# L; W q1 p. h scl=0; flash(); sda=1; flash();
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uchar readx()
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uchar i,j,k=0;. c; D2 g7 ~0 ~ Q: z' x
scl=0; flash(); sda=1;
/ v9 i6 ^- a) z* _1 f for (i=0;i<8;i++){
" @+ K; a M. ? flash(); scl=1; flash();
8 m* [- N4 V" e# R L7 N if (sda==1) j=1;; _2 A. h- ]4 }5 P c- @
else j=0;& R6 S+ d$ H/ ~2 \
k=(k<<1)|j; scl=0;4 i! n9 c; k( M) Q
}
4 ~; q+ V+ L5 D5 x flash(); return(k);+ N5 p& X( }+ l! f$ h/ D% N
}
8 ^8 W G- H- W void clock()7 L6 ` v% ?6 W6 y# f
{
) h# |% _3 o, b ~7 U c- k uchar i=0;
0 \( D7 w# s# l# |) M/ O scl=1; flash();
" C) J* s$ u- l4 X% W! w while ((sda==1)&&(i<255))i++;
" T) F7 q9 T* f5 E scl=0; flash();7 v/ a5 Q& k3 x8 Y
}
% _1 R# S0 S: _/ z uchar x24c02_read(uchar address)) d' A. y4 @: g I9 H
{
3 C- P9 m1 Y! b uchar i;2 M# z5 O$ A* U' Y; \, X8 H! D- S
start(); writex(0xa0);! Y7 r) x' k& W
clock(); writex(address);& E! u3 }" |, F- J- [( d
clock(); start();8 T# {: y4 r2 C
writex(0xa1); clock();. ^) ~ q+ K. n+ A) S: q) a
i=readx(); stop();
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return(i);- d9 o/ b- I- g# R
}
% }* _8 E u3 O$ ]3 H5 K void x24c02_write(uchar address,uchar info)
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start(); writex(0xa0);: g% _0 c |: M; A' R
clock(); writex(address);
4 B& C& G/ {! f) l8 Z1 S& Q clock(); writex(info);
r8 a/ f) c1 d1 d* ` clock(); stop();
' _5 U9 @, Y4 O; o5 ^" `2 A3 R, G EA=1;
; Y2 y- s1 T/ s delay1(50);7 l3 W- I6 M8 O+ L/ N6 T A7 x
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