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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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1 @/ [6 w8 ]; B #define uchar unsigned char
" l1 C; ?! w; y" _ #define uint unsigned int" W3 b _$ Y" Z: p( D' F: s
#include <reg52.h>
9 H3 N; }" J9 Z+ p) E5 P' Z #include <stdio.h>) G: i. R5 h8 j: F( p% w* A
#include <absacc.h>
4 G7 f8 f& M6 x' m# t3 s5 r sbit scl=P3^5; //24c02 SCL' P2 _, q) i/ U
sbit sda=P3^4; //24c02 SDA' g+ t/ `1 a9 d
sbit DOG=P1^7; //狗
; L% p/ {. d4 y9 Q# U% X uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据, a4 {- j6 m$ v1 A7 r; Q
void x24c02_write(uchar address,uchar info);
! K9 D6 q' r3 s //向24c02的address地址中写入一字节数据info
0 I6 V! A; b, h W4 H" J void x24c02_init(); //24c02初始化子程序
* `. P2 Y# M7 \2 y( J2 Q: C1 L" w void delay1(uchar x);
; W6 Y* [8 o, M) v/ k0 j void flash();
+ V$ y5 L# m5 N1 G- N: K' Q void x24c01_init();( h: u; k* ~! `# W7 R7 b
void start();
3 H, Q6 m9 I. W2 t: p void stop();9 G' C7 ~* N5 s* U/ _! @! V0 X" }
void writex(uchar j);2 G+ Q- h1 l t/ _9 w
uchar readx();
; v. Z0 J( f4 X, [9 m; R void clock();
5 f J2 t/ e. h3 M% b void delay1(uchar x); m+ {# I' b, Z& b6 W. v- u
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uint i;* K% q+ v1 ^/ K1 T
for(i=0;i<x;i++); H7 e, c5 A" g* H/ z Q
DOG=~DOG;3 N1 V: z+ n" e P" |: ]- }$ @2 A# C
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void flash()5 f; l" ^& q" ~2 j) h+ I8 u
{: P7 H. b) d1 u% [2 s- }8 v
uchar u;
; V& f8 x1 q7 Q1 ]5 x2 s; b" r DOG=~DOG;/ \0 b7 I) q: k( I' w9 I4 H& D
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void x24c02_init()( Q1 n5 S! y5 o: T5 r. v% m8 k
{, P T# m5 P# b# x
scl=1; flash(); sda=1; flash();
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void start()
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();0 o% E8 i; G9 K: Z) r( ` a, l4 z- q
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void stop()
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sda=0; flash(); scl=1; flash(); sda=1; flash();
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void writex(uchar j)
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% v- o( N0 E, z ~" l0 c uchar i,temp;* v4 T& z* W& q3 B/ q, _2 d
temp=j;
( ~' p, p# L( W- G! J for (i=0;i<8;i++){
! S$ S" k* Z1 p/ i& s temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; & \& E+ b" M6 M' p) U' Z7 X0 C
flash();7 s5 J5 ~" S7 G( V" a% L2 J! A
}
, h7 W/ ]; Z/ D, G: r# G scl=0; flash(); sda=1; flash();
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6 p- v* G6 h. M uchar readx()
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uchar i,j,k=0;
9 `* S$ B% b X scl=0; flash(); sda=1;1 b h0 s. z) }* e
for (i=0;i<8;i++){4 f/ c% m. v! N. ~; S7 [
flash(); scl=1; flash();
- D9 t: O% S& m. I, `1 q if (sda==1) j=1;/ L) L! o0 {2 G3 x& b" p8 e, s
else j=0; I6 o, B" f7 h+ O& m& E
k=(k<<1)|j; scl=0;3 T( ^) r5 Z- U0 o3 r( T
}
3 c$ L3 l8 O' |1 M% x/ P- E, m- A) H flash(); return(k);
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* l& U6 o5 E: ^: h0 P& ?/ |. v* C void clock()' U' {" k* w/ |# _' j9 Z
{
$ z. Z' i5 l* | uchar i=0;
5 a6 j' E& h( k$ }. a scl=1; flash();
, C4 \5 [" F' e while ((sda==1)&&(i<255))i++;% r2 F# s( l7 ?2 s$ y3 f {
scl=0; flash();
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2 i7 V' T4 r. [7 ` uchar x24c02_read(uchar address)* l% y, [' \; i" i0 J& E
{
( e9 [4 h- ~3 `- [4 z) q7 `# h& I# x uchar i;/ S7 |8 o2 P: m6 U
start(); writex(0xa0);
' @; L# M0 G( H# X: Q clock(); writex(address);
+ `9 \$ `! y# M4 a6 ~ O5 @7 ^ clock(); start();
7 x2 H! s2 ~5 K% _; T4 U/ }5 o( T9 d- a writex(0xa1); clock();
* ^' b' K* I- \# ^" I { i=readx(); stop();
$ y3 X) q' N( } o: E3 e4 V delay1(10);
- A4 X; V: s) ^5 U& B' t# H return(i);
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void x24c02_write(uchar address,uchar info)
3 M$ T; f9 T! q% B2 t5 ?$ ? {
* N6 @% d; D: n0 V1 F! X EA=0;6 B2 S' }$ p3 r7 \
start(); writex(0xa0);4 r( B* O- n/ r% H9 \" b
clock(); writex(address);
( f& @' B' _& X( c A# E6 t clock(); writex(info);
, u- a$ _: ?8 |& h! P9 M! F' ` clock(); stop();
. v! p4 p" q- T% r* Z* @ EA=1;
, L: r& {8 Y! S" c, {% ` delay1(50);
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