DS18B20.H
& v! X1 g% }0 H' f) X- #ifndef __DS18B20_H z- z5 Z* o! V9 }
- #define __DS18B20_H
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! ]* `7 n5 Q" Q& w; @, m# M( ~- #include "main.h"
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- #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2))
7 V! Y/ R4 L8 C+ } - #define MEM_ADDR(addr) *((volatile unsigned long *)(addr))
x/ E% Z5 x- h4 K, m! D6 z/ q! X2 F) c - #define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))
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1 W' q2 O9 ^7 m# X0 m2 `- #define GPIOA_ODR_Addr (GPIOA_BASE+12)
- u' H. y* V: ~$ a5 o - #define GPIOB_ODR_Addr (GPIOB_BASE+12)
/ P: t- o c& M2 |6 X3 C - #define GPIOC_ODR_Addr (GPIOC_BASE+12)
( }% I. H+ }9 ?: K$ z9 `" q - #define GPIOD_ODR_Addr (GPIOD_BASE+12)$ G" H. Y& V2 d
- #define GPIOE_ODR_Addr (GPIOE_BASE+12)
' [7 F" X% F! u2 k' O7 _ - #define GPIOF_ODR_Addr (GPIOF_BASE+12)# Y `' q+ E9 x3 J! j& K
- #define GPIOG_ODR_Addr (GPIOG_BASE+12). x; f* x8 s/ s
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- #define GPIOA_IDR_Addr (GPIOA_BASE+8)8 v" N' Z: b; X
- #define GPIOB_IDR_Addr (GPIOB_BASE+8); j! ^ B8 W3 ?! T4 v1 V
- #define GPIOC_IDR_Addr (GPIOC_BASE+8)
c: O( o" p/ V; q+ o2 h$ P5 ] - #define GPIOD_IDR_Addr (GPIOD_BASE+8)
7 I, S% \! [" S9 }4 Q5 u6 R - #define GPIOE_IDR_Addr (GPIOE_BASE+8)
% W' w3 H" F5 q7 e - #define GPIOF_IDR_Addr (GPIOF_BASE+8)
. G9 w q0 o4 n3 i: { - #define GPIOG_IDR_Addr (GPIOG_BASE+8)2 @4 w! A$ P# W" I5 @; K4 f' m
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- #define PAout(n) BIT_ADDR(GPIOA_ODR_Addr,n). E4 p: I& ]3 l' z- K2 `. x# P
- #define PAin(n) BIT_ADDR(GPIOA_IDR_Addr,n)3 Z- t" n1 ?7 U7 H' ?# C: c3 L2 t+ r
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- #define PBout(n) BIT_ADDR(GPIOB_ODR_Addr,n)* |$ F2 g8 {5 H' b
- #define PBin(n) BIT_ADDR(GPIOB_IDR_Addr,n)
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% M) N \: I5 z# T( d, Z- #define PCout(n) BIT_ADDR(GPIOC_ODR_Addr,n). q# R$ n0 X- A1 |' q0 Z% U
- #define PCin(n) BIT_ADDR(GPIOC_IDR_Addr,n)' f5 R6 b/ u5 j9 l* R/ h* v. T
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- #define PDout(n) BIT_ADDR(GPIOD_ODR_Addr,n)
% ?. V; s! c- q% L. {! o4 ^$ u0 o - #define PDin(n) BIT_ADDR(GPIOD_IDR_Addr,n)
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- #define PEout(n) BIT_ADDR(GPIOE_ODR_Addr,n)
) ~$ m/ t" Z3 n6 _: i2 b4 g - #define PEin(n) BIT_ADDR(GPIOE_IDR_Addr,n)
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8 u& V* K4 H, z1 a( w- #define PFout(n) BIT_ADDR(GPIOF_ODR_Addr,n)
8 O6 A: J6 `' u# a - #define PFin(n) BIT_ADDR(GPIOF_IDR_Addr,n)
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- #define PGout(n) BIT_ADDR(GPIOG_ODR_Addr,n)( l7 [' `/ r1 v0 S. b
- #define PGin(n) BIT_ADDR(GPIOG_IDR_Addr,n)
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- //IO方向设置% L! U0 Y; C( r3 p3 A9 \% a% m& v# q
- #define DS18B20_IO_IN() {GPIOA->CRL&=0XFFFFFFF0;GPIOA->CRL|=8<<0;}$ u; |0 Y, V _' R
- #define DS18B20_IO_OUT() {GPIOA->CRL&=0XFFFFFFF0;GPIOA->CRL|=3<<0;}0 g8 r4 q3 g( d3 b2 V
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- //IO操作函数
9 s- a5 N8 A! {1 X - #define DS18B20_DQ_OUT PAout(0) //数据端口 PA0* d" E$ b: C1 L% S" [) m
- #define DS18B20_DQ_IN PAin(0) //数据端口 PA0
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7 t( c5 `! f, e8 ~ - uint8_t DS18B20_Init(void); //初始化DS18B20
- h4 s; ~ W* c8 t5 A2 q - short DS18B20_Get_Temp(void); //获取温度
" D' z/ o/ S7 K( T - void DS18B20_Start(void); //开始温度转换6 t2 W5 q; f' h$ f- h- Y$ g4 N& H9 H
- void DS18B20_Write_Byte(uint8_t dat);//写入一个字节 X8 k- Z7 l1 o
- uint8_t DS18B20_Read_Byte(void); //读出一个字节
; b3 M2 A$ A$ [' s1 e! t8 W* j - uint8_t DS18B20_Read_Bit(void); //读出一个位7 c- R" t) J" o$ h- I) v
- uint8_t DS18B20_Check(void); //检测是否存在DS18B20
! l* |6 n& p) F1 C - void DS18B20_Rst(void); //复位DS18B20
9 f0 m5 B/ [+ I+ @. ?/ } - #endif
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DS18B20.C, j7 x5 Q {/ Y, `3 r% c
- #include "ds18b20.h"/ K4 d* o+ v! a0 s0 a- h
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- static inline void delay_ms(uint32_t delay)' ?/ d0 X1 G# P. d' h
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) Q9 G) z+ X8 `0 I! m - HAL_Delay(delay);
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5 d$ D4 D2 W) s) L- #define CPU_FREQUENCY_MHZ 72 // CPU主频,根据实际进行修改( Y ]7 @ ]! q O' @: r; C
- static void delay_us(uint32_t delay)1 d8 e) c8 F/ O+ R u
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- int last, curr, val;
6 T; N2 [4 S! g- a - int temp;
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: ]( T2 D' P* D0 i: m) x. Y, w- while (delay != 0)
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4 W1 g O/ G2 K; f+ B& j U( c - temp = delay > 900 ? 900 : delay;! q2 h4 p, \# Q5 L2 O+ I F
- last = SysTick->VAL;" t8 {7 R, J# A
- curr = last - CPU_FREQUENCY_MHZ * temp;
2 n# j* S0 D" U6 w/ G) i3 V0 Z! b - if (curr >= 0)$ }( E m* b' Q" @1 G# C
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/ w& ^; \: O3 r! W& g - val = SysTick->VAL;, m0 n' d9 x- |& l5 F$ w
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- while ((val < last) && (val >= curr));3 [/ E0 C# b1 A8 @4 a, z5 d/ F
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- else
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- curr += CPU_FREQUENCY_MHZ * 1000;
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- val = SysTick->VAL;7 m7 C9 G; N' K9 [3 X& j7 t9 x4 d
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$ J+ c" l' X; O t7 U' G - while ((val <= last) || (val > curr));; H v% x2 s9 }) l+ l
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- delay -= temp;
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5 g, g0 c6 M. F- //复位DS18B20
/ a0 p1 o" J% c, t0 {: f; E/ s4 I - void DS18B20_Rst(void) 9 b ^% s- y4 B
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- DS18B20_IO_OUT(); //SET PA0 OUTPUT. ^( q3 C: f: }& t0 L
- DS18B20_DQ_OUT=0; //拉低DQ7 N3 S. A: a( E% d& |
- delay_us(750); //拉低750us' @$ R' R# D: w# L/ e
- DS18B20_DQ_OUT=1; //DQ=1
- X6 z* t( Z9 o5 }( e& R - delay_us(15); //15US& `( Y& T0 r7 N
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- //等待DS18B20的回应
0 W. y. n$ U, g5 K" C - //返回1:未检测到DS18B20的存在
k$ P- y% h% E2 {# H - //返回0:存在 o# V u7 d& k/ w) K% v
- uint8_t DS18B20_Check(void); b' T4 `' j( Y1 p7 ^% u
- {
1 `' S% g4 d @) F6 E8 s! ^1 ]" ~ - uint8_t retry=0;
t! x3 Z9 m6 C3 e4 t. G8 a$ d; E \ - DS18B20_IO_IN();//SET PA0 INPUT
+ V9 N- U6 b" }4 D - while (DS18B20_DQ_IN&&retry<200)5 D0 t2 e0 s; P7 d
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/ p2 \1 m6 b0 S. K - retry++;8 Z3 e! _1 T( w3 C# G' D4 ?3 T
- delay_us(1);
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- if(retry>=200)return 1;) E% F8 X3 x# V* S, w
- else retry=0;
) t& m9 w4 i5 G' |2 q3 D4 T' w - while (!DS18B20_DQ_IN&&retry<240) ^& T3 Z1 W" b& D* V
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- retry++;
/ ^9 ]9 Y& O- f# U - delay_us(1);" }8 q5 y; k2 ]8 \" k9 }6 p
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- if(retry>=240)return 1; 8 I R4 h+ {; k
- return 0;
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- //从DS18B20读取一个位2 Z6 b2 V% t3 j2 ?
- //返回值:1/0$ {0 Q. O8 R5 i) z% ]; B
- uint8_t DS18B20_Read_Bit(void) // read one bit# n5 s1 i$ I' F. z) L
- {
d5 ^' W5 C9 P6 l5 S4 H3 J - uint8_t data;
4 J8 _) w* l ~% f/ E. j9 ~8 t - DS18B20_IO_OUT();//SET PA0 OUTPUT/ e$ ?6 y% L9 H# T. i
- DS18B20_DQ_OUT=0; . o! W+ R# ~( ~% k, ^ P+ x/ [
- delay_us(2);
- n0 Y5 |7 v7 P) o - DS18B20_DQ_OUT=1;
" ]5 e! s# ]2 y% B% ^! y - DS18B20_IO_IN();//SET PA0 INPUT% k( T ]- B+ Y! d3 r5 p
- delay_us(12);# |0 v$ M/ k' @! ~2 I
- if(DS18B20_DQ_IN)data=1;
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% }: R) |/ x8 j9 P, t( t# { @ - delay_us(50); # H: Z# n9 w) {! S
- return data;; A0 X* t. l3 y7 C2 D
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- //从DS18B20读取一个字节( I2 d& z' T) x% H1 h
- //返回值:读到的数据
" L! M3 ^- g; Q$ U- h7 E& @ - uint8_t DS18B20_Read_Byte(void) // read one byte3 b- G- z* s8 f6 O. Y9 `
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- uint8_t i,j,dat;
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- for (i=1;i<=8;i++)
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- j=DS18B20_Read_Bit();
, P t1 t t( `( }3 S - dat=(j<<7)|(dat>>1);' x( E$ K2 W) i
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- return dat;0 |, O0 N/ [$ C% n' F& E
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- //写一个字节到DS18B20$ U4 a$ T- y- n
- //dat:要写入的字节
( o$ ~, C& s# p9 ~. M; { - void DS18B20_Write_Byte(uint8_t dat): m; z5 @2 l' ~% Q, R
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- uint8_t j;
$ l, j7 T4 U- V: a - uint8_t testb;
# A" K1 @- a- F! A. E) K1 e, N4 O8 R - DS18B20_IO_OUT();//SET PA0 OUTPUT;
$ F' R8 K0 D* y7 e - for (j=1;j<=8;j++)
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- testb=dat&0x01;
3 H* B5 ?3 _* }2 x - dat=dat>>1;+ t4 ]5 o' U. ~6 m# m
- if (testb) , d3 X; h7 v- ~; ]' C3 l& r* P
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- DS18B20_DQ_OUT=0;// Write 1
( l6 \9 P% G( K& Y$ x - delay_us(2); 1 k: e5 o1 t- q9 s0 w: e( E) c
- DS18B20_DQ_OUT=1;# k! X& ^' U* }/ K' n4 h) \
- delay_us(60);
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0 s. [- H$ }8 ?2 z' h) Z$ P+ q" o3 N - else
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6 Y# d* I/ y5 p' C/ ~ - DS18B20_DQ_OUT=0;// Write 0& D3 e. O* B) [9 M" N8 E
- delay_us(60); & T! t5 ?6 h) d
- DS18B20_DQ_OUT=1;
2 r7 E, h, _; f/ L3 s - delay_us(2);
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- //开始温度转换
6 R( J+ J% y/ ^- o/ v - void DS18B20_Start(void)// ds1820 start convert
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- DS18B20_Rst(); 5 f) q' O E- E5 J
- DS18B20_Check(); . A' j- O0 T* @: j* M
- DS18B20_Write_Byte(0xcc);// skip rom
) q- ?2 @3 y; A' U) G' F6 j _5 ~9 T - DS18B20_Write_Byte(0x44);// convert7 p) a- p0 p* v3 ^: n, {9 g! r8 t8 d
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; n% k! F/ V: S. I1 z - //初始化DS18B20的IO口 DQ 同时检测DS的存在
- { I) k& M8 g/ z0 G w" V - //返回1:不存在( A/ U( |/ V' @5 @" L) x" n( r
- //返回0:存在 5 q3 T. B2 K' v6 O8 T/ z
- uint8_t DS18B20_Init(void); D7 L% M( x5 ~' J
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- DS18B20_Rst();/ R6 y( n/ Q: c6 G+ Z+ T
- return DS18B20_Check();1 I8 f C$ D9 Y8 ^: ?9 H
- }
/ F. ]. W/ f, U - //从ds18b20得到温度值
8 `$ n* h5 Y, n; l3 A& W - //精度:0.1C
1 W" c: N$ } A - //返回值:温度值 (-550~1250)
1 }& O6 G$ w1 a - short DS18B20_Get_Temp(void)9 J/ j2 S2 o$ ^0 Z3 B
- {
, c0 J& V0 l) K5 t- Q t - uint8_t temp;' \1 L y" J9 Y3 F
- uint8_t TL,TH;& J+ M' |9 J [8 D0 e
- short tem;
h1 [& E2 L: L/ g) { - DS18B20_Start (); // ds1820 start convert
; b% M& v6 o1 W+ } - DS18B20_Rst();
# C, `" e: p! a0 q \ - DS18B20_Check();
$ I7 s8 Q, ^0 p& Z4 [ - DS18B20_Write_Byte(0xcc);// skip rom* y2 d# t0 z7 `
- DS18B20_Write_Byte(0xbe);// convert : ]7 n: w% _4 q# I M) m! U R9 p
- TL=DS18B20_Read_Byte(); // LSB ( W7 u2 S. F* t- N Y9 O+ o4 m
- TH=DS18B20_Read_Byte(); // MSB 3 Z$ }( \2 S. K
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- if(TH>7)9 d) T6 z3 \ F
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2 i3 n' _1 w/ f7 w - TH=~TH;
+ |1 M& ?! O' Z- C( M7 A0 E - TL=~TL;
" l0 }5 U% b' Z M% B E7 A - temp=0;//温度为负
2 F/ Z0 h' K, {9 R - }else temp=1;//温度为正
% n0 D& j. ]* v4 ]2 _/ z - tem=TH; //获得高八位+ _! h: g6 G+ l5 \& O5 `3 W
- tem<<=8; 0 ]( x# G6 I) Q! ^( C8 J* v% z( T
- tem+=TL;//获得底八位
; F- f- X m( U3 N. D - tem=(float)tem*0.625;//转换
Z* S2 h/ n- [1 l - if(temp)return tem; //返回温度值$ J" A b0 @& L
- else return -tem;
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