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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：; @7 e X% P Z3 u1 Z I/ ^( V
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# \8 ~1 p4 A! q7 L6 d3 h7 Q" ^ #define uchar unsigned char
& p! `7 G& J7 q# }3 M #define uint unsigned int$ W3 h/ }, g: u! G, z6 s
#include <reg52.h>7 _; g8 H$ v! I( K$ Y9 B
#include <stdio.h>: n+ R- \6 L4 ^3 Z4 i5 [3 \
#include <absacc.h>7 ~8 E$ W2 c3 c. Z% Z4 [$ T5 E' \
sbit scl=P3^5; //24c02 SCL
7 Y: E2 T5 C. n1 V2 L sbit sda=P3^4; //24c02 SDA4 Y4 e+ z" X9 \, i5 M
sbit DOG=P1^7; //狗
, Z- \- Q1 Q% D: \/ p8 V" \ uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
, o( m; A6 y" i6 c void x24c02_write(uchar address,uchar info);
: W9 Z a; h% u8 j //向24c02的address地址中写入一字节数据info+ P( F: _0 T% ~/ d" ^& F4 ?
void x24c02_init(); //24c02初始化子程序( ]* @" @/ S, {- G, c1 j" c" Q
void delay1(uchar x);# K2 O8 \* G& ?4 w
void flash();
) G h6 D" P) @* P. b4 b, y void x24c01_init();
1 D. W' Z8 h- f( O3 I5 i void start();7 s% Z1 B' _7 k2 r) ]4 f3 @$ b
void stop();
5 ^+ `! Y' p2 u) ~3 a" ?3 x" O+ y1 ? void writex(uchar j);
L6 n+ F: J { uchar readx();
8 Z! j$ ^2 U& W8 Z& b) m) a7 n void clock();& Y. _; S& t1 j* l3 W# i
void delay1(uchar x)
0 e. B3 B5 C% p3 _# J {
" j" ?0 z& v3 h& l' x9 w uint i;
! v: H: ~" X& e: B for(i=0;i<x;i++);
& I" y) C- a2 }& R- I- f5 e DOG=~DOG;# |9 J9 D. U: _' a6 `& ?
}
+ B$ W4 d# |% V B! U6 O void flash()% B- E$ U i/ N) x/ Z
{
4 B4 N( o2 T+ ~) A uchar u;
) ^4 B% e1 e3 I" Q8 ]# D/ `: A DOG=~DOG;
) N; g, a' r9 M0 h/ H( X2 q }
! D+ H# ]) ~$ ?0 x7 o* ~1 _. P% S void x24c02_init()* y2 h) d% {, T( `& T8 }; L' T/ I
{
8 i+ L+ c% F/ {1 x0 |! Q8 g 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();! H' X6 D' K, K+ n" K7 ^
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void stop()
' p& E3 m+ q3 I# g- [: T: F8 } {
6 T* A( T# s# _, m0 T sda=0; flash(); scl=1; flash(); sda=1; flash();
: [( t/ y% |- {7 x- A }
0 |1 R& m: _; i9 L6 u# | void writex(uchar j)+ C6 \7 f# o; z, A5 U! K2 ^
{
7 X7 h F2 R# _+ S) o uchar i,temp;! Q) j( B( J; f* _) R0 P d+ V0 {
temp=j;- {" ]% B& ?: x4 \% C
for (i=0;i<8;i++){
j7 u1 C4 i! e- ~7 v0 s temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; ! C9 ?9 l: B2 i' D. Q
flash();
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scl=0; flash(); sda=1; flash();
+ C0 e' n7 z, d1 x( a5 A; M }
; W$ `5 Y7 J( L. r2 ^1 f uchar readx()
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uchar i,j,k=0;
7 f2 B+ n/ E7 a! Z7 e$ g scl=0; flash(); sda=1;" P/ j% _. L1 v2 [; ^' y
for (i=0;i<8;i++){% Y: V* Z. _& x5 p
flash(); scl=1; flash();
& q1 N# J0 L( N* {& k! h if (sda==1) j=1;+ i. x" _# V/ R: U7 S
else j=0;, Z9 F, V( B; ~
k=(k<<1)|j; scl=0;' v, L! T. m' J, j* b
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flash(); return(k);: { L: h( e* A2 f- k% Y7 a q
}
4 \7 j) \4 ?! O8 A& M void clock()& j8 Q' t* k7 r+ h k& g- n6 t8 i
{
! N! n& S% \1 m. n6 L uchar i=0;
% T; U0 B B) g9 P8 y# Z scl=1; flash();
, m9 L1 O" b( W while ((sda==1)&&(i<255))i++;+ [2 H1 q `, N3 h
scl=0; flash();
. N% o B, V' m7 _3 n" t }
3 ~1 k& g: h7 k' S- h) s e% g uchar x24c02_read(uchar address)
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uchar i;6 P7 z7 u3 o0 g3 H- d# e4 O
start(); writex(0xa0);
. i/ p# ?4 s3 h1 i1 e clock(); writex(address);
0 G" d2 X, B( H O- ~6 n2 R clock(); start();7 @+ r0 ]5 p$ ` _' w6 G" t/ r
writex(0xa1); clock();4 o; E' p1 M ?' |, k6 N. X3 P& H* u
i=readx(); stop();- F x; E! K" J5 t
delay1(10); ?; I% z, {* x% l
return(i);& I) M6 _# e3 _7 c4 T
}
+ O8 H' u; L4 u/ J void x24c02_write(uchar address,uchar info)' M+ b# @" t" w; V: I
{
: m Z( _; b, ] Z2 @5 p, l EA=0;! o7 N" ?- x8 W& h
start(); writex(0xa0);: ?: x# B& ?; N
clock(); writex(address);
9 v$ [5 [* f3 ]9 Q& p clock(); writex(info);+ p/ w* W, X9 Q' K
clock(); stop();. {/ y o! I. o3 }( q. d1 s
EA=1;
( u3 e3 q3 [6 j0 T/ g- P# Q delay1(50);
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