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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：9 ?9 V6 j9 I1 ?: v8 [
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* s+ ?- C2 k: A o% K #define uchar unsigned char# e6 B6 t4 ?/ M% @% M* w. ^" F
#define uint unsigned int
' u% g; a5 @( r) D5 {* F #include <reg52.h>
2 P$ R9 w8 F3 n/ O #include <stdio.h>
" s1 V0 V \5 W2 W! C #include <absacc.h>) S5 d( y K0 ^
sbit scl=P3^5; //24c02 SCL1 }: s! Y* F0 B# @2 I# f
sbit sda=P3^4; //24c02 SDA& X0 S) w' X( `2 W" ^
sbit DOG=P1^7; //狗
) _$ _4 f' J3 K- H7 @ uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
2 e( C( o9 m6 }" A void x24c02_write(uchar address,uchar info); 6 E1 q+ F. e. x6 P
//向24c02的address地址中写入一字节数据info
+ y3 w/ \) q; F E* T1 R' V void x24c02_init(); //24c02初始化子程序8 B# a9 Y6 {7 G- ?
void delay1(uchar x);4 M* `& Q ]1 b5 G
void flash();
4 ]" ?* A9 {8 E1 |3 O void x24c01_init();: ^9 O3 T& n+ H5 _) ^
void start();3 L% k2 y/ n) F( N) X! L
void stop();
1 Z( D# F% K! t: J! [* G void writex(uchar j);
6 q$ m& H8 M' x: { uchar readx();
4 c0 ^* _; |" @, V void clock();. i5 }$ i4 J, L( d
void delay1(uchar x)
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uint i;
1 X* X0 `9 T" u2 T for(i=0;i<x;i++);7 U' O7 t4 r0 A5 y
DOG=~DOG;4 I* L* P* r6 T' [) k2 f9 V
}
$ U1 H+ X1 \2 X2 `) |& f void flash()
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uchar u;
7 \% l' T) ]- X! _ DOG=~DOG;
' f9 S, d2 h7 T% B1 G }
9 q+ [4 {3 z, o% B void x24c02_init()
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scl=1; flash(); sda=1; flash();* Q7 ]$ t5 _, k0 v( i
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void start()
; n: K: H4 Z1 Z$ }) L {
5 f+ x7 x, ^5 u3 [ sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
. P* }: U/ I4 a; A# S6 n }
F* a( Q' V- _' O& v void stop()9 z- V0 D- t# H M }3 j F) [
{
) ^5 z0 G- u6 i( {) S sda=0; flash(); scl=1; flash(); sda=1; flash();# \+ ~& }% N4 Q5 ^. N
}/ |4 C2 X4 _; y2 G+ _
void writex(uchar j)
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uchar i,temp;
; c7 R) e& F' O: k7 w" P3 b0 U0 X7 u temp=j;$ c( E v/ U7 H7 @ Y
for (i=0;i<8;i++){
) v0 I) O3 O# N+ c5 h temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; 8 j) a1 ^ X( l/ X4 W3 o
flash();0 C1 B# B- L7 E" ^
}
8 K4 U( B! I) v; B; y8 k scl=0; flash(); sda=1; flash();
( e- K, a: y# |' u }# {1 J7 Y# a9 T0 _, \ l
uchar readx()
3 `& ?% B; c7 ] {
" q5 a- P$ c9 I7 I: W. q0 v# t3 v uchar i,j,k=0;
. C* }. F) A/ j/ z# ?7 q& h! U scl=0; flash(); sda=1;' Z6 D0 [% N4 \0 T
for (i=0;i<8;i++){
F! E! t3 Q. J- u& s: Q$ S flash(); scl=1; flash();
! k3 W# b4 q( U/ z5 P if (sda==1) j=1;
- D% T3 S h2 U1 a! ] else j=0;
9 {0 L z' p% I) } k=(k<<1)|j; scl=0;
! c2 H5 w8 K9 Z5 M# `0 | }
2 m; @ A; X9 ^- ~# i flash(); return(k);
) c3 D f/ y! \: ~- W% d }/ E% P# }' ^. ^
void clock()
$ J2 e9 B% s" l R1 _4 q$ p {
' ]& k6 E% i2 F) h" k, f v) B uchar i=0;, k Y) D5 B7 G& p" n
scl=1; flash();
& n5 ]* k, l+ G while ((sda==1)&&(i<255))i++;+ Q0 f3 Q; M, y9 h% S* x; ~( z, B
scl=0; flash();
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uchar x24c02_read(uchar address)/ w* K! U5 n4 ?" ]4 S+ i G) z
{% b) |3 w! x& b/ X n I/ f
uchar i;
# K6 v. E9 Q* ~# C4 ^" @ start(); writex(0xa0);
& b( b( q: q( |& U# K$ K clock(); writex(address);7 L- U2 d5 u$ A# H& w0 Q( e$ x6 Z
clock(); start();
, K( l1 q# X4 Y& _0 I writex(0xa1); clock();% O, i* |6 `; ]' w% A( M0 O1 i
i=readx(); stop();
1 {, i# v$ v( F4 |' D! Q% q8 Y4 G delay1(10);
; c$ X D% [- m; |4 d4 S7 @" f return(i);. F7 N [$ h; z
}
( Q9 o/ V- V! B; T void x24c02_write(uchar address,uchar info)+ t9 q; c- k2 [$ |! ], }5 T
{
+ @( w D" X4 q& ]3 x, b1 [ EA=0;
) b: N, H T- J start(); writex(0xa0);
4 S# J' r) _4 U* F4 N9 C0 \0 {( D clock(); writex(address);7 E2 {' l, S! _- D! }! [
clock(); writex(info);
! B0 b5 Q& I! U- \, t5 N* I. X clock(); stop();4 L2 ^& L: |' V
EA=1;1 K2 ~' }0 o& I1 S1 b! E
delay1(50);3 s' R4 _7 {2 T4 Q9 b
} |
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