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II2C总线芯片 24c0x读写程序
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% V% C m R) s& q4 b3 k#include<reg51.h>, j; [2 {0 w, `8 E* }5 u) T
#include"intrins.h" // _nop_();/ r( ]0 p" \7 r0 w0 z$ T1 ~) z0 j
#define uint unsigned int
1 Q, d p3 u7 u1 ]8 g#define uchar unsigned char! v# ^" r4 S- G) }) u
sbit scl=P2^1;: h0 H" a2 X R% O! \
sbit sda=P2^0;
7 S) ?, t- L: Y! Y) Y6 gbit write=0;8 g- Z" i% X: e: m, f# E! T
uint num,num1;
6 h0 E$ u& R4 suchar ge,shi;. ~( p' U5 e6 F& H7 \4 u4 T
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,+ o% ?( m! m" l, N/ O/ ^5 B
0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};0 O. f& ^) h2 P! ^
void delay_ms(uint Z)/ E# [. C' l+ f( ?+ x" Q/ ~# `
{
* @3 @7 y0 G2 w+ z; I uint x,y;
/ O& T4 Y# m+ z. Q: D) ]9 @9 t' U for(x=Z;x>0;x--) : y! V1 X% D" A
for(y=110;y>0;y--);
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/*****ÅäÖÃIICD¾Æ¬**********/
1 ^+ ]4 R1 C" Uvoid delay()
6 v- v( I* `( S: L+ C/ F: `) s{
1 D" h! }$ q0 X+ O3 L @" g- G _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();9 r7 {' \4 p+ I
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void start()//¿aê¼; p, j! W- i, D I" m
{
k3 G! y( P& q, n sda=1;: k$ c# [% I! I! }2 _
delay();
- e) k3 N/ l6 R2 Q scl=1;
1 |, K8 T3 U7 B8 f( _( l" g7 t delay();6 P/ F0 I# v2 U/ T% ^3 R
sda=0;: ? v- U) `3 f9 E4 {$ t
delay();* P7 ^& s6 p9 d
}; i7 x# {* u7 Z+ w, x. p1 _
void stop()
: z( o, _6 F4 m/ f{
( S1 a! E/ g$ p0 ]: N1 \ H sda=0;
5 i: d# ?& t2 H" D2 {% G0 A# X delay();
% z0 P0 a3 ^* Q7 J8 Q. \. h% Q scl=1;1 N5 I/ P7 V, i+ C# A* Q+ Y
delay();3 r0 z4 J: A) O8 p
sda=1;3 | j! ~3 C& }& }5 M2 e
delay();( B# M$ y6 t; _0 ?. K
}
# ?' K* |, S9 S5 v$ ]" X# y) Lvoid respons()) x. J3 h1 G* D0 X2 Z/ X
{
" F- d& S/ b a' Q- ?1 A+ J: Z uchar i;
, P% Y) _9 l4 ~3 M E+ H4 o scl=1;
( e; L& |! }, V3 u( F* M& Q delay();
6 o; d1 Z- F# }8 b2 O. p! o while((sda==1)&&(i<250))
& @5 z- y* m7 A+ Q i++;
7 z! x0 f" W! g; \6 b/ \7 g6 _( w scl=0;7 B9 z s3 T6 w# M( s3 e
delay();
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: V# Y( X5 {- f0 d( fvoid init()
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sda=1; f1 \/ U2 j' g
delay();
# S. Z, D0 S# B scl=1;/ S! Y- p t' }
delay();
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. Y) b% b/ A# Y; W- d6 V- [) svoid write_byte(uchar date)
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T U ~% H; R! P uchar i,temp;! z, t! ~9 Q2 ^3 D) `& G
temp=date;
7 I: A; r* K4 F; a; p0 A for(i=0;i<8;i++)
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% f; B: B% O" W8 Z* f! m5 l6 J temp=temp<<1;
d7 y) |6 O0 D- ~2 P n) _ scl=0;
( I% C# i& V& C) }* R# M% h3 ~ delay();% H$ P$ ?' R( K! S" u: H
sda=CY;
6 s p& s- S* z! z: R/ ~5 z delay();
' t9 W: r9 i# Y! E, H. x2 u scl=1;. ]6 b3 `; H) x$ p
delay();/ z% `1 @* g3 e2 V4 z
}
! X/ [. A* \ |: U; o scl=0;
( n) h. z$ N4 p( R delay();! k9 L# L8 X% d: d; r. s
sda=1;
9 u- g! a0 d C* G+ L delay();
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uchar read_byte()
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$ g& x# t8 O8 _; K8 F U uchar i,k;
$ r0 H8 A- j( d2 ~. K p, ~2 G scl=0;
/ W. ^. M, X( C& z4 \0 J, B delay();! G+ p+ N; v' x4 ]! ]/ Z
sda=1;9 T5 `' R- X4 }0 `/ N
delay(); t p0 o! C5 b" @ l7 ^& ?
for(i=0;i<8;i++)2 i! y- u5 M3 G0 ]
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scl=1;3 J. a7 ]5 N. p0 I h `6 Z
delay();7 c' Y7 K% [9 W: s. G
k=(k<<1)|sda;///////
. e* Z6 q$ n1 E7 q scl=0;) R" C( z% ]: U8 v
delay();$ G- I" q, s+ k3 w$ h' T6 R
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return k;7 Y2 B7 z2 g6 \0 u4 L8 N0 m
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% u; f1 r7 d' _3 kvoid write_add(uchar address,uchar date)( t5 Y# X' P3 J& k4 ~( l* N
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start();2 t" t; Q) m% |% }" k' t* n
write_byte(0xa0);4 | C- w9 J0 [) h9 o9 j+ x
respons();
9 I) `! d5 f! i( W( s write_byte(address);
Q* t8 P0 U% B respons();! R( V" O; m. M* j$ i% ~
write_byte(date);. |+ z! Q9 a% I0 ^- q( P
respons();$ Y& p! N, Y% i) u
stop();
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uchar read_add(uchar address)
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uchar date;3 D1 r# I1 V5 ?3 D" |8 e* f$ j
start();5 U6 P1 v; _( K D3 N4 ~ }
write_byte(0xa0);' l! `5 C2 _" l* Z, ^3 l
respons();
2 T# [1 S$ i5 q$ I* J) T6 k write_byte(address);
2 J4 e6 f- i* y3 ~. k6 l respons();/ b) c0 @! D7 N/ y8 e
start();! V8 h5 q) Z1 w: g3 Y" @9 b
write_byte(0xa1);
# u4 Y, m* A) t$ n% P! o5 p respons();! u( O5 K7 Y) w0 K% H. j& M3 [
date=read_byte();7 x8 u( X3 R& N s5 a* h
stop();
" P- ]$ Z4 U2 A& f: U return date;
+ d0 o2 `8 e$ ]' O3 Y" h2 E}
# z4 ?3 \4 y0 ?; f% U/************êyÂë1üÏÔê¾oˉêy*********************/
8 ]- {' [, ^0 @void display(uchar shi,uchar ge)+ P2 ~ ?5 B4 d( i; o* a2 W0 o
{
& S( x2 j3 v9 x/ N P1=0xdf;6 K" v9 |2 b! r& z' i3 ?
P0=table[shi];
+ \% K" F. \6 L# l2 F1 S/ B3 F+ b$ Z delay_ms(5);
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6 p6 `: ?3 J! k3 `% ~' A P1=0xef;) ]! a- B. ~. N4 @" L, F' R5 z
P0=table[ge];
! F" D [7 z8 u# ? delay_ms(5);
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# |' u# v* F4 a+ r/ P/ s}
2 |8 `: E8 J2 ]6 \7 h1 f: D/*********Ö÷oˉêy************************/) |3 O5 ]/ [ G) b
void main()
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init();" E+ q# N" Z# z6 ^
num1=read_add(2);6 p: _0 ?* u$ N; u
if(num1>100)
! \; ?4 _, T9 @ `) g" R num1=0;: H; @: C6 U {; W( U
TMOD=0x01;
) f4 R8 }# N% V0 C5 C- m TH0=(65536-50000)/256;
6 Z3 z \4 U( b- U U9 Q, h TL0=(65536-50000)%256;$ K: y4 q1 Q/ `& U4 h8 ?
ET0=1;, a: b4 I5 p% G1 q* s
EA=1;5 D) x4 H3 Q* I W# m! n* ^( v
TR0=1;, `; B( s p- N
while(1) _) _! {2 k- U, q
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display(num1/10,num1%10);
* Z/ o% ~ M# p C if(write==1)) C, O }+ \7 b" K6 X
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write=0;
. ]' T0 _5 I, g' {6 ? write_add(2,num1);9 [" R1 x$ N# M8 ^& A7 ]
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}
8 V$ f$ o8 L: b9 z& b/*******ÖD¶Ïoˉêy*****************************/6 b8 S" w, k. Z! N) @5 f
void time0() interrupt 1) a4 H) b+ ?6 Z) G- O8 x
{
3 C( U: `, k$ p. p TH0=(65536-50000)/256;7 d5 p5 W% y& w
TL0=(65536-50000)%256;
. N; P* {% |( E4 X) p num++;
7 ~- _& Z" V* y2 o$ W' c if(num==20)
' ~0 S9 C! Q8 w8 Y2 {( K$ R7 b {
" j6 _, l9 u; ^* o8 o' Z num=0;) g3 L3 ?" {( s$ q
num1++;
" y, q/ }6 s# L1 n( i2 x write=1;# X8 k0 b3 e9 a( Z7 k- n
if(num1==100)
' E. P# N9 t$ l/ o5 n- v0 y num1=0;( V' a ^. V2 [, i6 i( j: b* \% A5 v
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