这是电路图和主函数初始化的代码,接下来会贴出PCF8563的具体代码 $ d4 S; z. f! N 1 o. ^% k1 }4 N8 i6 Y& b: r |
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#define PCF8563_GPIO GPIOB
#define PCF8563_SDA GPIO_Pin_15
#define PCF8563_SCL GPIO_Pin_14 m, n8 M; q6 Y A; W
#define Write_ADD 0xA2 //PCF8563的写地址
#define Read_ADD 0xA3 //PCF8563的读地址2 L6 w" b1 D9 O! y, E5 Y8 G# p, i$ {
4 a( v( B% y' I- J4 N
#define PCF8563_Start() IIC_Start(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)$ { `0 p: d8 O; h( d+ K( s, p
#define PCF8563_Send_Byte(n) IIC_Send_Byte((n), PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)
#define PCF8563_Read_Byte(n) IIC_Read_Byte((n), PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)
#define PCF8563_Wait_Ack() IIC_Wait_Ack(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)# ?# D& O6 q. }4 m# `. k- o& n
#define PCF8563_Stop() IIC_Stop(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)6 L e- m5 y X' j' b+ f
4 c* [2 b3 [5 Q% M
//************************************' p& H: i& t0 V8 Z! }
// Method: PCF8563_Init
// FullName: PCF8563_Init& x! y; y: P0 m( V# Q
// Access: public
// Returns: void, V4 o9 c8 k9 w2 w O( L
// Parameter: void
// Description: 初始化PCF8563的IO口和寄存器" B% U% l. ~3 H- U
//************************************
void PCF8563_Init(void)
{
IIC_Init(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA);
delay_ms(20);
PCF8563_Set(CONTROL_STATUS1, 0x00);
PCF8563_Set(CONTROL_STATUS2, 0x00);
PCF8563_Set(CLKOUT_CONTROL, 0x81); //使能CLK输出,1024Hz3 f! o1 ]* x1 {1 g+ O
}& D& [1 H+ U* m* F) u! x5 j/ M4 J
//************************************& e' r: W0 v5 n- E
// Method: PCF8563_Read
// FullName: PCF8563_Read' g, ^/ X1 d1 t( h' d
// Access: public 3 |+ F# k; c1 U i
// Returns: void' f. v/ s1 z5 |7 |! w
// Parameter: PCF8563 * pcf8563! E% n' Y6 P5 B! R+ p2 x& x* g
// Description: 读时间 年、月、日、时、分
//************************************8 F2 l% c5 z0 Z% }' G! k9 C* ^) m
void PCF8563_Read(PCF8563 * pcf8563)) ?# X" z5 q8 `9 m6 B
{ P3 s' C6 k/ J# V) N- `) p
PCF8563_Start();
PCF8563_Send_Byte(Write_ADD);% |$ Q/ G" S0 F9 J$ \" ^
PCF8563_Wait_Ack();; k% L6 @) n2 n/ }6 o
PCF8563_Send_Byte(MINUTES); //分寄存器地址0x03" g1 y' i+ r" B% q0 W, n8 U: Z
PCF8563_Wait_Ack();
PCF8563_Start();
PCF8563_Send_Byte(Read_ADD);# l! K* _0 k; C
PCF8563_Wait_Ack(); H( _- g# L( z
pcf8563->minutes = PCF8563_Read_Byte(1) & 0X7F;
pcf8563->hours = PCF8563_Read_Byte(1) & 0X3F;% U" v' |, ^$ Y: |
pcf8563->days = PCF8563_Read_Byte(1) & 0X3F; q1 d' X! z& I8 b6 p: O- [& G
PCF8563_Read_Byte(1); //读取星期寄存器,该数据不保存: }+ h+ n9 z! b8 ~3 c
pcf8563->months = PCF8563_Read_Byte(1) & 0X1F;
pcf8563->years = PCF8563_Read_Byte(0);9 X1 _7 c9 K9 F; G
+ d1 i }( }/ E0 J% Q9 s& m
PCF8563_Stop(); //发送停止信号; c* o$ g5 {$ D* Q
//将时间从BCD编码变成十进制3 C( k5 J# _: s9 ]( c" d
pcf8563->minutes = BCDToDec(pcf8563->minutes);
pcf8563->hours = BCDToDec(pcf8563->hours);. d5 `5 v. O8 v2 v
pcf8563->days = BCDToDec(pcf8563->days);7 s/ `; M2 w& W/ n( |# n' \
pcf8563->months = BCDToDec(pcf8563->months);
pcf8563->years = BCDToDec(pcf8563->years);
}
//************************************/ I1 Y/ p0 n" [( U6 ~7 M$ l0 N$ Y
// Method: PCF8563_Write
// FullName: PCF8563_Write- _+ W' ~+ k5 K) A
// Access: public - |2 }+ t: C$ `# j; s
// Returns: void
// Parameter: PCF8563 * pcf8563) X9 V3 ~0 @5 ~8 k( |
// Description: 将时间(年、月、日、时、分)写入PCF85639 W# E: Z& d* @; r. Z
//************************************! o v$ r k# a, E9 o
void PCF8563_Write(PCF8563 * pcf8563)& w8 Q/ E; j9 u
{
//将时间从十进制变成BCD编码9 h9 M4 D0 l8 F8 A$ z
pcf8563->minutes = DecToBCD(pcf8563->minutes);
pcf8563->hours = DecToBCD(pcf8563->hours);% B& Q# [- k! g) |3 x9 `! Q5 ]
pcf8563->days = DecToBCD(pcf8563->days);
pcf8563->months = DecToBCD(pcf8563->months); n( @; x- w# ~6 B" h# R$ T" t
pcf8563->years = DecToBCD(pcf8563->years);4 m/ n6 R' p, K
PCF8563_Start();
PCF8563_Send_Byte(Write_ADD);. S; s0 M' c5 A9 z' w; n) `
PCF8563_Wait_Ack();" M7 N+ J g0 r8 C
PCF8563_Send_Byte(MINUTES); //分寄存器地址0x03
PCF8563_Wait_Ack();
PCF8563_Send_Byte(pcf8563->minutes); //发送分
PCF8563_Wait_Ack();* Q; \ ?4 C J) d: J* N- e( u& c
PCF8563_Send_Byte(pcf8563->hours); //发送时
PCF8563_Wait_Ack();4 U2 ^% f& O3 C; j+ G+ I
PCF8563_Send_Byte(pcf8563->days); //发送天# k2 t; L5 w& Y1 _- F
PCF8563_Wait_Ack();
PCF8563_Send_Byte(0x00); //发送星期,不关注星期几8 M3 P- a& `+ A& q8 y, O) ^/ G
PCF8563_Wait_Ack();
PCF8563_Send_Byte(pcf8563->months); //发送月! o$ x, o- r# ~1 X5 t. D
PCF8563_Wait_Ack();
PCF8563_Send_Byte(pcf8563->years); //发送年
PCF8563_Wait_Ack();
PCF8563_Stop(); //发送停止信号
}
//************************************
// Method: PCF8563_Set
// FullName: PCF8563_Set
// Access: public 4 a+ [ s% z# |3 P" P& b- j8 g
// Returns: void
// Parameter: PCF8563_REGISTER regaddr7 \6 {: {6 \' J! D$ I' R ^- A
// Parameter: unsigned char _data
// Description: 设置寄存器的值
//************************************
void PCF8563_Set(PCF8563_REGISTER regaddr, unsigned char _data)" p* ], u$ Q( D/ H- B2 [
{1 `9 h) b, Z6 K: _0 O c$ k/ C) Z
PCF8563_Start();
PCF8563_Send_Byte(Write_ADD);, j# |3 ?" t1 m
PCF8563_Wait_Ack();
PCF8563_Send_Byte(regaddr);
PCF8563_Wait_Ack();
PCF8563_Send_Byte(_data);0 a L1 \! G* P& \0 r: x
PCF8563_Wait_Ack();
PCF8563_Stop();
}
4 m5 k+ N4 |/ h4 r ^
//************************************
// Method: DecToBCD1 X; H5 x1 g5 Z1 f: q/ k/ m
// FullName: DecToBCD' @5 E* r: n* i, P$ F
// Access: public 6 e7 D) n4 u) k* H! O+ R
// Returns: unsigned char7 A* {2 M Q Y* d
// Parameter: unsigned char _dec
// Description: 十进制转BCD编码; e$ x9 ^+ }0 i5 o8 \6 o
//************************************
unsigned char DecToBCD(unsigned char _dec)2 X1 I6 H! d& ^! b: @- T* j& y m
{
unsigned char temp = 0;
while (_dec >= 10)
{
temp++;- L" `( K" P& p6 _: f6 K
_dec -= 10;% f8 n0 ?5 t6 [ a" z, j) Q
}/ E4 V8 {6 a3 W. d. w
return ((unsigned char)(temp << 4) | _dec);
}0 l- G' |9 R0 R* F b1 H# V
0 i0 c6 ^4 b7 s' X. H; l9 ^9 L# a# C( g
//************************************/ E6 B3 K8 [4 q/ |
// Method: BCDToDec
// FullName: BCDToDec
// Access: public
// Returns: unsigned char& w8 m% g# B2 i
// Parameter: unsigned char _BCD. J1 @0 Q9 D, H" g, G
// Description: BCD编码转十进制
//************************************' E/ K5 T+ y; E4 R
unsigned char BCDToDec(unsigned char _BCD)- x0 \6 }9 \, @* ]( `
{
unsigned char temp = 0;
temp = ((unsigned char)(_BCD & (unsigned char)0xF0) >> (unsigned char)0x04) * 10;
return (temp + (_BCD & (unsigned char)0x0F));
}
复制代码
#include "IIC.h" u$ _. K& n8 U; ]9 q
//#define SDA_H() SET_BIT(GPIO->BSRR,SDA_Pin)
//#define SDA_L() SET_BIT(GPIO->BRR,SDA_Pin)0 h0 X' i6 d. i$ F3 y3 Y
//#define SCL_H() SET_BIT(GPIO->BSRR,SCL_Pin)
//#define SCL_L() SET_BIT(GPIO->BRR,SCL_Pin)
#define SDA_H() (GPIO->BSRR|=SDA_Pin)
#define SDA_L() (GPIO->BRR|=SDA_Pin)
#define SCL_H() (GPIO->BSRR|=SCL_Pin)
#define SCL_L() (GPIO->BRR|=SCL_Pin)' g0 s, Y/ _. H2 ^5 S( W
//************************************
// Method: IIC_Init! P* g' X6 Y- d& o' o! V
// FullName: IIC_Init% R+ I. n# F( }0 {* @; E/ y4 M7 W
// Access: public
// Returns: void' G! e( D4 t$ E
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin9 I5 M7 q* e: d H' `' E1 V
// Description: 初始化IIC,设置SDA、SCL为开漏输出,初始为高电平
//************************************
void IIC_Init(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)0 b' q6 [* c- R* h
{7 G9 I, Z0 A# \: Z1 r
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //本次应用中,两个IIC器件均在GPIOB上2 L. z+ T5 t1 F# x! O
. B- \6 v0 [( q$ h) |: V" T: p3 J& D8 z
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; //开漏输出5 f' _4 N: g+ r. \) S# _# k
GPIO_InitStructure.GPIO_Pin = SCL_Pin | SDA_Pin;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;$ h- K3 [6 u* _, |: v* o$ P
GPIO_Init(GPIO, &GPIO_InitStructure);) U; ~3 }8 r" z% p/ {0 s4 A
//GPIO->BSRR |= SDA_Pin;& D! Z; o/ D- t4 R
//GPIO->BRR |= SCL_Pin;! O: J4 B7 x' b- ?
GPIO_SetBits(GPIO, SDA_Pin | SCL_Pin); //SDA、SCL初始状态为高电平9 j$ ]7 N' O V K: X4 c
}9 Q; d" `5 c& Y# s
//************************************, p( U, i5 i; f
// Method: IIC_Start- U" [/ b2 S" j& r* }
// FullName: IIC_Start
// Access: public $ g. l8 s' A" c& i* B% H" k
// Returns: void: S: f/ X5 u! |; X! f) ?2 d
// Parameter: GPIO_TypeDef * GPIO! R" G: _3 n( p6 v1 J4 R( V
// Parameter: uint16_t SCL_Pin# C& _0 A5 D( N4 O6 o
// Parameter: uint16_t SDA_Pin1 w" w- q% O& o
// Description: 产生起始信号,SCL为高电平时,SDA下降沿) g6 q0 T/ } j1 M* x+ a4 m
//************************************6 ]1 n0 Q: i% s n" p
void IIC_Start(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
SDA_H();
SCL_H();
delay_us(4);
SDA_L(); //开始信号( E& n |! s/ N+ O# m& u
delay_us(4);$ a' H4 B2 i& n/ y
SCL_L(); //拉低SCL电平,准备发送或接收数据
}) o' j. ~: h9 G9 [! i
//************************************
// Method: IIC_Stop
// FullName: IIC_Stop
// Access: public
// Returns: void; W( J2 U; j# ?
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin, c% f7 F( X4 A: X
// Parameter: uint16_t SDA_Pin8 q; M3 `2 Q4 O0 @4 b1 I/ E
// Description: 产生停止信号,SCL为高电平时,SDA上升沿
//************************************ r y2 L4 r$ C5 m6 W
void IIC_Stop(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
SCL_L();
SDA_L();
delay_us(4);
SCL_H();9 F( ]2 k$ p% `' a. p* E- F6 b
SDA_H();
delay_us(4);* W; a9 Q5 s2 k# }( r$ N1 X: l
}5 v( Z7 }5 p, w+ A% i$ |7 t
P" t: A% f. ?; b' y
//************************************
// Method: IIC_Send_Byte# E+ U2 R. I( b) c/ P& }
// FullName: IIC_Send_Byte
// Access: public k) M8 B8 b L& x: O4 P. N
// Returns: void& a' \5 v! b M1 c, T* u4 T
// Parameter: u8 txd
// Parameter: GPIO_TypeDef * GPIO2 s, r' J/ o0 G/ J1 h2 S
// Parameter: uint16_t SCL_Pin0 N! N- H; `: z) S
// Parameter: uint16_t SDA_Pin
// Description: IIC发送一个字节$ \+ e4 _9 K- i2 N8 @
//************************************
void IIC_Send_Byte(u8 txd, GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin) D9 w) ?5 A% w
{
u8 t;
SCL_L(); //拉低时钟开始数据传输
for (t=0;t<8;t++)# t: t* J* j, _2 ~+ H9 }$ }
{
GPIO_WriteBit(GPIO, SDA_Pin, (BitAction)((txd & 0x80) >> 7));6 C% x# `% C; ^+ c& t v
txd <<= 1;/ g0 e* F7 K- _% l) G
delay_us(2);
SCL_H();
delay_us(2);
SCL_L();
delay_us(2);
}- C1 ]/ I8 T' p( B9 e1 p9 d. I" i
}$ L) O1 \* w K8 ^9 Y- f
- p; j* P$ c r5 l
//************************************2 E! j! u# p' F8 K& d4 ?+ l
// Method: IIC_Read_Byte
// FullName: IIC_Read_Byte
// Access: public
// Returns: u8
// Parameter: unsigned char ack$ }2 f Z# f0 d; k1 O! f* u* |& u! I4 z
// ack=1,发送ACK
// ack=0,发送NACK
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin- D: F7 j! M8 `& i) U. ^9 X
// Parameter: uint16_t SDA_Pin
// Description: 读一个字节,SCL低电平时,改变SDA: _& [ x7 A7 R* M6 a
//************************************
u8 IIC_Read_Byte(unsigned char ack, GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{3 P( `8 B+ r5 M* d: B
unsigned char i, receive = 0;& v' ]8 r3 x7 B
SDA_H(); //释放总线- }# c# y( d3 y
for (i = 0; i < 8; i++)
{' U+ Y- Q9 K. q0 Z
SCL_L(); H! g1 g& D! W9 E) G: s
delay_us(2);- o; i; m2 R$ p5 n9 Q
SCL_H();6 h8 U1 R# M, _
receive <<= 1;( V- T* T; s$ l2 U8 j/ N
if (GPIO_ReadInputDataBit(GPIO, SDA_Pin))* `' h2 Y% h$ x9 z
{
receive++;# @% R8 m! I% E p
}! O# ^/ ^* {9 | i* X9 s* Y
//receive |= READ_BIT(GPIO->IDR, SDA_Pin);/ w/ c0 S: n! g! o4 R
delay_us(1);6 U$ U" d, p: t4 ^% i5 ?$ t0 a' @
}
if (!ack)
IIC_NAck(GPIO, SCL_Pin, SDA_Pin);//发送nACK
else
IIC_Ack(GPIO, SCL_Pin, SDA_Pin); //发送ACK + L a# }% Q3 b8 J: A! h8 {% s
return receive;
}
//************************************
// Method: IIC_Wait_Ack
// FullName: IIC_Wait_Ack
// Access: public
// Returns: u8 1-接收应答失败,0-接收应答成功
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin- j U5 q5 o1 |$ Q
// Parameter: uint16_t SDA_Pin8 e) I8 W" i$ a! T& g0 D
// Description: 等待应答信号到来
//************************************) t3 c- c/ }) m, p6 O" L, V4 l# _5 b/ ?
u8 IIC_Wait_Ack(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin), e( M! M; q h
{8 q- Y+ j7 C9 v G8 H. g' D
u8 ucErrTime = 0;$ z, K! ^( r$ l5 ^* _9 q0 _. p) ~
SDA_H(); //释放总线4 L! _. C" S& E
delay_us(1);6 B1 ^% J; ?) Z2 o( q! I! J/ Z$ z0 q
SCL_H();
delay_us(1);; b% _2 l+ U& T' s% _; {6 H
while (READ_BIT(GPIO->IDR,SDA_Pin))
{
ucErrTime++;
if (ucErrTime > 250)/ X3 ?; Z, E" `' Y3 d( B9 `4 C8 W
{% f9 I4 M' v, v/ n0 M" V
IIC_Stop(GPIO, SCL_Pin, SDA_Pin);6 r) j9 q$ [3 f( [+ N ^$ D2 T
return 1;
}
}+ R9 |6 C3 C+ y$ h( e% O) l8 E X. }
SCL_L();
return 0;
}
//************************************
// Method: IIC_Ack
// FullName: IIC_Ack
// Access: public $ @( F# S$ |* W; e
// Returns: void4 K6 x5 ?7 x6 z, z9 @* w3 S
// Parameter: GPIO_TypeDef * GPIO7 W3 V5 I: ~6 `1 H: L
// Parameter: uint16_t SCL_Pin' O" s! Z5 W! d. ` }. l
// Parameter: uint16_t SDA_Pin
// Description: 产生ACK应答,设备在接收或发送到一个字节后能拉低SDA电平
//************************************
void IIC_Ack(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
SCL_L();, X& F# t1 @6 Y7 D+ ^& I/ Z/ u* r9 [
SDA_L();& y# H1 Q$ Z* |; r# n! L
delay_us(2);0 W; i: m3 c7 \6 d, Z7 t" j8 q d
SCL_H();4 `1 L, J# U3 r1 O. ^* ^) O* P1 r& w
delay_us(2);1 O2 o0 y# I0 t
SCL_L();5 i7 \0 n( n- t H
}& ^# \# q; v, v# \/ N
E- ?4 h& C$ U. ]7 I& \" P2 J
//************************************' j4 f' F! e0 R/ i. e3 r, z* m
// Method: IIC_NAck
// FullName: IIC_NAck
// Access: public
// Returns: void* K& ~; D' {% `
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin% a* t6 `. |2 t. {* l
// Parameter: uint16_t SDA_Pin) m/ e0 t" ] N5 j
// Description: 产生NACK应答,设备在接收或发送到一个字节后能拉低SDA电平
//************************************- G2 S8 D' O4 ]# B4 C. a9 o. G' W
void IIC_NAck(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)% B4 Z9 K, {# o% Q, q
{
SCL_L();6 f( D, U8 r+ w. h; M3 {) S3 _/ N. a
SDA_H();1 U4 Q& b% z8 a" j& i% \6 I! c
delay_us(2);
SCL_H();% Y, A; u( L' X. a) ~( X
delay_us(2);
SCL_L();
}