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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:: V& L9 Y7 Z8 d7 [7 D; f3 L. Y
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#define uchar unsigned char
+ B3 U0 s. ~) x, d k #define uint unsigned int" i8 \; C" x `# D; R; V
#include <reg52.h>
( B7 L$ {! z. t6 t6 r #include <stdio.h>& W) Y ]( F6 _6 y! r% v. \
#include <absacc.h>- ^# m; C6 ?/ C2 \
sbit scl=P3^5; //24c02 SCL
8 N! R9 @: d2 X" P, v& k' E) ? sbit sda=P3^4; //24c02 SDA
1 Z. _) I* P4 e$ I9 o sbit DOG=P1^7; //狗* D, Z, @) X3 w4 q, V0 q) f# {
uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
- g2 f5 _% J# p! J, G# T void x24c02_write(uchar address,uchar info); 9 P6 \4 r9 P, n5 Z C+ N4 M+ c0 x
//向24c02的address地址中写入一字节数据info1 G9 ~- m6 g) I4 a' q8 v# J
void x24c02_init(); //24c02初始化子程序6 V7 U5 P, X2 u8 \% J/ y
void delay1(uchar x);& I2 f1 G1 R/ t! p) y, H3 e$ G5 p
void flash();
" l# ~. M5 J2 p- ~9 D. \$ X; w void x24c01_init();% ~. O, X( j \) E1 Q$ P% l
void start();
/ y* m+ ?' L8 M& l2 g+ j* V% u$ L void stop();- R' q1 J* G% ?3 P; G$ |
void writex(uchar j);
5 b g6 k2 r3 V uchar readx();
) o. p( H& q7 [* ~ void clock();# V. \7 b/ N; Y8 O: j. p$ D4 I
void delay1(uchar x)
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uint i;
# W8 O9 O# o( i, D$ s# \- ^- a7 F/ M for(i=0;i<x;i++);
2 G# o+ Z' z# U6 N$ G DOG=~DOG;( S5 R9 A* T! i
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void flash()
, N( {3 P+ P0 T {
- c) t1 {& z: L- o uchar u;0 k9 r; m: J1 i( W7 `4 }7 W
DOG=~DOG;+ n6 q. m" s) e1 i/ t4 W
}
- d1 M5 |; Q( O7 v void x24c02_init()6 }$ |- v& z7 i) s5 K; c* _% a6 A
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scl=1; flash(); sda=1; flash(); z# y8 V" Q9 i3 X& M
}
, t3 _! _# O, b' J void start()
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sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
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void stop()2 {& d! w/ X& _) E3 g
{/ _$ R+ M7 f9 l3 h% k
sda=0; flash(); scl=1; flash(); sda=1; flash();* `; Y! ?5 h8 d
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void writex(uchar j)
7 s% k" L! u; z9 H {
, n. h8 ` @: O- B5 h uchar i,temp;! H9 `1 S1 [5 t( b9 D" a
temp=j;
+ `2 ]- y+ c0 ]4 _% x) ]! ^ for (i=0;i<8;i++){
/ o' \2 ~9 L9 o& }: W4 {" g. h5 j% O4 ]% ^ temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; 5 A4 ~7 u& a+ [+ W
flash();9 R$ N: ^4 I" x7 @3 X* D) U
}
. F7 {! k% E' e" b. E scl=0; flash(); sda=1; flash();
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uchar readx()
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uchar i,j,k=0;) I+ C' |. [8 G+ ~& e
scl=0; flash(); sda=1;
; q0 D1 C( F) }: O for (i=0;i<8;i++){+ C, a& H7 ^8 P+ W. |
flash(); scl=1; flash();
9 ?( N8 ^0 y5 x if (sda==1) j=1;; H, e0 f0 ^) h# q
else j=0;& T. K) }5 t& w, Q
k=(k<<1)|j; scl=0;
, @9 i3 P. Q8 I1 K& k; W }
8 z; p# r4 i; D7 R7 w& Q# V. m flash(); return(k);' u8 @8 T( l o. M2 b8 i' Q& t8 M2 f
}
: q! i* y& u3 b- R+ Q3 y6 \+ r void clock()% L# f) z- O, @
{
" B8 z& u2 k: K. w- m% D uchar i=0; C _+ n4 f+ G
scl=1; flash();
4 z; m8 G2 {" j while ((sda==1)&&(i<255))i++;
) ^$ B3 L! V+ F6 t+ u1 a) V; C scl=0; flash();
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uchar x24c02_read(uchar address)
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uchar i;) G, ]9 [) [2 B; a" |
start(); writex(0xa0);
: k0 D E9 c7 P clock(); writex(address);" O# x$ J/ e( {: E9 t7 b
clock(); start();7 n, [. y' @( W
writex(0xa1); clock();
& z) O% O6 k* q/ s& i* D i=readx(); stop();
7 i2 ~, @& B+ B" g0 j delay1(10);
, g9 R+ L$ M/ ]+ \+ `4 U return(i);
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void x24c02_write(uchar address,uchar info)! z0 c# {+ `/ e( F3 o& [6 c" Z
{
) c; b" Y( A. ^$ j% J EA=0;
5 d! p' g: X1 b! O start(); writex(0xa0);+ \( `: L5 n% |
clock(); writex(address);
F- M" x4 T1 @4 \ q4 W( y, a1 E$ A clock(); writex(info);
, q. E7 `6 E$ D clock(); stop();! B- \/ K3 K8 Q" N* J
EA=1;$ ?9 v1 D& z& c6 D
delay1(50);/ G* Y; }0 o! \7 |/ V _+ Z
} |
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