2019年11月15日 | PIC单片机上实时时钟PCF8563测试程序

..............................PCF8563测试程序主函数............................

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#include

#include "pcf8563.h"

#include "IIC.h"

__CONFIG(FOSC_INTOSC&WDTE_OFF&MCLRE_OFF);  //PIC配置位设置

void init_fosc()    //PIC内部晶振设置

{

OSCCON=0x61;

}

...................在PCF8563.h头文件里定义的结构体.....................

struct Time

{

uchar second;

uchar minute;

uchar hour;

uchar day;

uchar week;

uchar month;

uchar year;

};

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struct Time time;

void main()

{

init_fosc();

time.second=55;

time.minute=51;

time.hour=11;

time.day=2;

time.week=6;

time.month=4;

time.year=14;

P8563_Set_Time();   //PCF8563设置时间子函数

nop();nop();

while(1)

{

P8563_Read_Time();//读取PCF8563子程序

TRISB=0b00000000;

PORTB=~time.second;

uint n;

for(n=0;n<600;n++)

{

nop();

}

}

while(1);

}

...............................IIC通讯子程序.................................

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#include

#include "IIC.h"

void start()   //IIC起始程序

{

TRISC5=0;   //SCL输出

TRISC4=0;   //SDA输出

    SDA_OUT=1;

    SCL_OUT=1;

nop();     

SDA_OUT=0;

nop();      //大于4us

SCL_OUT=0;  

}

void stop()  //IIC停止子程序

{

TRISC5=0;

TRISC4=0;   

        SDA_OUT=0;

        SCL_OUT=1;

nop();        //大于4us

SDA_OUT=1;

TRISC4 = 1;   //  结束后释放总线，sda输入

}

uchar IIC_Get_Ack(void)   //检测应答信号

{

TRISC4=1;        //应答信号由从机发出，所以SDA设为输入

SCL_OUT=0;

SCL_OUT=1;

nop();

if(SDA_IN==1)    //读取SDA状态时，SCL保持高电平

{

ACK=1;

}

else

{

ACK=0;

}

SCL_OUT=0;

return (ACK);

}

void IIC_Ack()           //主机向从机应答，发送继续信号

{

TRISC4=0;

TRISC5=0;

SDA_OUT=0;

        SCL_OUT=0;

SCL_OUT=1;

nop();            //大于4us

SCL_OUT=0;

SDA_OUT=1;

}

void IIC_NOAck()         //主机向从机非应答，停止继续读取

{

TRISC4=0;

TRISC5=0;

SDA_OUT=1;

SCL_OUT=0;

SCL_OUT=1;

    nop();

SCL_OUT=0;

SDA_OUT=0;

}

void IIC_Write_Byte(uchar dat)     //发送一个字节

{

uchar bitcount=8;

do

{

TRISC4=0;

TRISC5=0;

if((dat&0x80)==0x80)       //dat最高位为1，SDA拉高；dat最高位为0，SDA拉低

{

SDA_OUT=1;

}

else

{

SDA_OUT=0;

}

SCL_OUT=0;

SCL_OUT=1;

nop();

SCL_OUT=0;       //SCL为低电平时，允许SDA电平变化

dat=dat<<1;

bitcount--;

}while(bitcount);

TRISC4=1;

nop();nop();

}

uchar IIC_Read_Byte()            //接受一个字节

{

uchar temp1=0;

uchar bitcount1=8;

TRISC4=1;                //SDA设置为输入

TRISC5=0;

do

{

SCL_OUT=0;

SCL_OUT=1;

nop();

if(SDA_IN)

{

temp1=temp1|0x01;    //如果SDA为1，则置高temp1最低位

}

else

{

temp1=temp1&0xfe;    //如果SDA为0，则置低temp1最低位

}

SCL_OUT=0;

if(bitcount1-1)

{

temp1=temp1<<1;

}

bitcount1--;

}while(bitcount1);

return (temp1);

}

................................PCF8563子程序.......................................

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#include

#include "PCF8563.h"

#include "IIC.h"

struct DownCounter dcounter;

struct Time time;

uchar Val2BCD(uchar x)   //十进制转BCD码子程序

{

return ((x/10)<<4)+((x)&0x0F);  

}

uchar PCF8563_Write_Bytes(uchar addr,uchar length,uchar *pbuf)  //写入子程序

{

uchar send_da;

uchar i=0; 

start();

IIC_Write_Byte(0xA2);     //器件地址

do

{;

}while(IIC_Get_Ack());

IIC_Write_Byte(0x02);    //器件读取起始位

do

{;

}while(IIC_Get_Ack());

for(i=0;i

{

send_da=*(pbuf++);

IIC_Write_Byte(send_da);

do

{;

}while(IIC_Get_Ack());

}

stop();

nop();nop();

}

uchar PCF8563_Read_Bytes(uchar addr,uchar length,uchar *pbuf)  //PCF8563读取子程序

{

uint receive_da;

uchar i=0;

start();

IIC_Write_Byte(0xa2);   //器件地址

do

{;

}while(IIC_Get_Ack());

IIC_Write_Byte(0x02);   //最小地址

do

{;

}while(IIC_Get_Ack());

start();

IIC_Write_Byte(0xa3);   //器件读取地址

do

{;

}while(IIC_Get_Ack());

TRISC4=0;

while(length--)

{

receive_da=IIC_Read_Byte();

*(pbuf++)=receive_da;

IIC_Ack();

}

IIC_NOAck();

stop();

nop();nop();nop();nop();nop();nop();

return pbuf[i];

}

uchar P8563_Read_Time()   //PCF8563读取时间子程序

{

uchar temp[7];

PCF8563_Read_Bytes(0x02,0x07,temp);

time.second=BCD2Val(temp[0]&0x7f);

time.minute=BCD2Val(temp[1]&0x7f);

time.hour=BCD2Val(temp[2]&0x1f);

time.day=BCD2Val(temp[3]&0x3f);

time.week=BCD2Val(temp[4]&0x07);

time.month=BCD2Val(temp[5]&0x1f);

time.year=BCD2Val(temp[6]);

return 0;

}

uchar BCD2Val(uchar x)   //BCD转十进制

{

return ((x>>4)&0x0f)*10+(x&0x0f);

}

uchar P8563_Set_Time()   //PCF8563设置时间子程序

{

uchar temp[7];

uchar i;

for(i=0;i<7;i++)

{

temp[i]=Val2BCD(((uchar *)(&time))[i]);

}

return PCF8563_Write_Bytes(0x02,7,temp);

}

uchar P8563_Set_DownCounter()

{

return PCF8563_Write_Bytes(0x0e,2,(uchar *)&dcounter);

}

uchar P8563_Read_DownCounter()

{

return PCF8563_Read_Bytes(0x0e,2,(uchar *)&dcounter);

}