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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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#define uchar unsigned char4 {5 _. h. q A% Y
#define uint unsigned int }: Z: ^5 v+ V5 Q# |# I5 {
#include <reg52.h>" v) D: e% d! @
#include <stdio.h>
+ e) }8 j6 E! k- ] |& D& C% L/ ^ #include <absacc.h>
\" {* e X1 @; D; q8 P; k1 U sbit scl=P3^5; //24c02 SCL
& `* m# F# U$ o# t- H sbit sda=P3^4; //24c02 SDA. @5 W) t! @3 h0 C/ {
sbit DOG=P1^7; //狗
$ D! l) U6 S3 x# m, r5 Y6 }7 C uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
/ ^2 _3 H2 q1 ?1 ?8 Q void x24c02_write(uchar address,uchar info);
( a$ ]2 h4 {( M# t0 k. ] //向24c02的address地址中写入一字节数据info; E; M9 N- G1 P: Z) u4 n- R+ |
void x24c02_init(); //24c02初始化子程序
P! a: A$ x8 G5 A void delay1(uchar x);
& y9 E+ ~3 d! S7 J$ ] h: X/ Y void flash();/ O! ]" ]2 ]! k6 i& G
void x24c01_init();
1 R- m, n; r3 Y2 W7 B void start();+ W2 J# z7 ~% r3 M& p3 v2 M1 D
void stop();* s" |6 l" Z ]$ X
void writex(uchar j);+ [5 W) q- C1 v0 T
uchar readx();4 [! D, C: t d/ S
void clock();1 _8 ]* T. L8 O3 }
void delay1(uchar x)
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: d# H2 I# q- Y1 S5 x7 _: t$ V8 f uint i;, W$ c: k/ n/ E* M$ A1 ^$ h; h
for(i=0;i<x;i++);
7 W& |5 E2 {# ` M0 z f" E) O DOG=~DOG;; G$ C+ G3 N- l. a8 d! h) \5 E( K
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void flash()( n# y; X" {$ L' Z0 g# H! K% a2 U
{
" d9 L$ P. |2 ^' C- i7 Q3 k( l uchar u;) _- F# x! c: _- x
DOG=~DOG;
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void x24c02_init()! _: Y2 @9 G/ b, `
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scl=1; flash(); sda=1; flash();
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void start(); `; H& n, l' l" L/ p
{
, G4 N. M. p% Z/ d8 Y9 ^! i' b sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
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void stop()
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sda=0; flash(); scl=1; flash(); sda=1; flash();/ B$ p% E# ~5 E- p
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void writex(uchar j)
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uchar i,temp;
1 O. J* `0 `( X( n# g temp=j;, v3 Q& d. d9 x9 G% p0 K; t
for (i=0;i<8;i++){! {6 ^3 v& j; O- V
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; ) F; A9 _1 p6 q" f- Q3 |! c& Q# \/ N
flash();
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scl=0; flash(); sda=1; flash();8 o# U5 R5 e7 o; Y8 ~
}
, w$ _# p9 Y; Q3 U% W uchar readx()6 \4 b) P9 C% g: f" R7 k) I5 Q3 [
{
- N" k/ P S- U2 o6 G- x" e$ ~4 K uchar i,j,k=0;
8 m2 W4 e* w- Z E% p scl=0; flash(); sda=1;, l5 t! \# x4 ?9 ]: _
for (i=0;i<8;i++){" W; r! h1 H7 Q+ h1 d4 `9 p
flash(); scl=1; flash();6 M1 i7 O6 _5 _1 B9 j2 G0 e
if (sda==1) j=1;
* r! B% Q" w8 m& c+ I else j=0;
" l& r- F3 [* M& W k=(k<<1)|j; scl=0;: `* r( |2 ?% C% w$ g0 B/ P
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flash(); return(k);
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void clock()
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+ n) F( K- a* {! ]+ j uchar i=0;7 ^0 X# I- b. W. k
scl=1; flash();' W' L1 f+ y* j7 ?# M
while ((sda==1)&&(i<255))i++;
% A) L9 v1 H& Y scl=0; flash();
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uchar x24c02_read(uchar address)
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) _: i) [$ L8 ^+ T' y! E uchar i;3 P( b4 o+ N1 o% E7 j6 U
start(); writex(0xa0);4 X. j1 [5 D l( B. \ `
clock(); writex(address);
" V5 x/ _# N" Y; G. o8 y7 ` clock(); start();$ |, q7 j$ o3 H6 }1 j( h
writex(0xa1); clock();) i3 [& Y( |0 @- V
i=readx(); stop();" I( S7 R0 E1 y4 b8 \/ y
delay1(10);9 X- P5 `+ _5 A& N, v
return(i);5 y; _! O/ K0 z) |1 f8 R
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void x24c02_write(uchar address,uchar info)& Y4 V" ]7 o; R' `3 j- T# G
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EA=0;
: Y( q+ U; S, V' ]" k0 ~ start(); writex(0xa0);/ E, ~6 y+ A0 j
clock(); writex(address);
% h j6 g n) L* o# Y: k clock(); writex(info);
L4 N% L* W2 T3 n clock(); stop();5 @( {$ G$ q! Z
EA=1;1 v* n5 b; h: N
delay1(50);0 o' r7 M. W* ?1 k4 l7 C) h
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