PIC16F877A DS1302芯片驱动

本文大体介绍了PIC16F877A DS1302芯片驱动

#include

typedef unsigned char uchar;

typedef unsigned int uint;

#define rs_h PORTC|=0x01

#define rs_l PORTC=0xfe

#define rw_h PORTC|=0x02

#define rw_l PORTC=0xfd

#define en_h PORTC|=0x04

#define en_l PORTC=0xfb

#define rst_h PORTC|=0x08

#define rst_l PORTC=0xf7

#define sck_h PORTC|=0x10

#define sck_l PORTC=0xef

#define io_h PORTC|=0x20

#define io_l PORTC=0xdf

#define SECADD 0X80//秒寄存器地址

#define MINADD 0x82

#define HRADD 0x84

#define DATEADD 0x86

#define MONTHADD 0x88

#define DAYADD 0x8a

#define YEARADD 0x8c

#define CONTROLADD 0x8e

#define PORT (PORTB)

void delayms(uint x);

void lcd_com(uchar com);

void lcd_dat(uchar dat);

void lcd_write(uchar c,uchar r,uchar dat);

void lcd_init(void);

void Ds1302Init(void);

void WriteByte(uchar dat);

uchar ReadByte(void);

uchar BCDtoDex(uchar dat);

uchar DextoBCD(uchar dat);

uchar ReadByte(void);

void Ds1302Write(uchar add,uchar dat);

uchar Ds1302Read(uchar add);

void main(void)

{

uchar sec,min,hr,date,month,day,year;

TRISB=0x00;

TRISC=0xc0;

lcd_init();

Ds1302Init();

while(1)

{

sec=Ds1302Read(SECADD);

min=Ds1302Read(MINADD);

hr=Ds1302Read(HRADD);

date=Ds1302Read(DATEADD);

month=Ds1302Read(MONTHADD);

day=Ds1302Read(DAYADD);

year=Ds1302Read(YEARADD);

sec=BCDtoDex(sec);

min=BCDtoDex(min);

hr=BCDtoDex(hr);

date=BCDtoDex(date);

month=BCDtoDex(month);

day=BCDtoDex(day);

year=BCDtoDex(year);

lcd_write(0,1,0x32);

lcd_write(0,2,0x30);

lcd_write(0,3,0x30+year/10);

lcd_write(0,4,0x30+year%10);

lcd_write(0,6,0x30+month/10);

lcd_write(0,7,0x30+month%10);

lcd_write(0,9,0x30+date/10);

lcd_write(0,10,0x30+date%10);

lcd_write(0,14,0x30+day);

lcd_write(1,4,0x30+hr/10);

lcd_write(1,5,0x30+hr%10);

lcd_write(1,7,0x30+min/10);

lcd_write(1,8,0x30+min%10);

lcd_write(1,10,0x30+sec/10);

lcd_write(1,11,0x30+sec%10);

delayms(1005);//1ms

}

}

void Ds1302Init(void)

{

rst_l;

sck_l;

Ds1302Write(CONTROLADD,0);//关闭写保护

Ds1302Write(MINADD,DextoBCD(06));

Ds1302Write(HRADD,DextoBCD(19));

Ds1302Write(DATEADD,DextoBCD(20));

Ds1302Write(MONTHADD,DextoBCD(5));

Ds1302Write(DAYADD,DextoBCD(7));

Ds1302Write(YEARADD,DextoBCD(12));

Ds1302Write(SECADD,DextoBCD(30));//写秒,同时启动时钟

}

void WriteByte(uchar dat)//上升沿输出

{

uchar i;

TRISC=0xdf;

for(i=8;i>0;i--)

{

sck_l;//低电平时数据线可变

if(dat0x01)

io_h;

else

io_l;

sck_h;

dat>>=1;

}

}

uchar BCDtoDex(uchar dat)//BCD码转十进制

{

uchar i;

i=dat/16;

dat%=16;

i=i*10+dat;

return i;

}

uchar DextoBCD(uchar dat)//十进制转BCD码

{

uchar i;

i=dat/10;

dat%=10;

i=i*16+dat;

return i;

}

uchar ReadByte(void)//下降沿输出

{

uchar i;

uchar dat;

TRISC|=0x20;

for(i=8;i>0;i--)//要考虑之前写完后的状态，第一次进入此循环体即有下降沿

{

dat>>=1;

sck_l;

if(PORTC0x20)

dat|=0x80;

sck_h;

}

return dat;

}

void Ds1302Write(uchar add,uchar dat)

{

rst_l;

sck_l;

rst_h;

WriteByte(add);//最低位置0表示写

WriteByte(dat);

rst_l;

}

uchar Ds1302Read(uchar add)

{

uchar dat;

rst_l;

sck_l;

rst_h;

WriteByte(add+1);//地址最低位置1表示读

dat=ReadByte();

rst_l;

return dat;

}

void delayms(uint x) //8M晶振下，延时1ms

{

uint y,z;

for(y=x;y>0;y--)

for(z=220;z>0;z--);

}

void lcd_init(void)//LCD1602初始化

{

lcd_com(0x38);

lcd_com(0x0c);

lcd_com(0x06);

lcd_write(0,5,0xb0);

lcd_write(0,8,0xb0);

lcd_write(1,6,0x3a);

lcd_write(1,9,0x3a);

}

void lcd_com(uchar com)//向LCD1602写命令

{

rs_l;

rw_l;

PORT=com;

delayms(1);

en_h;

delayms(1);

en_l;

}

void lcd_dat(uchar dat)//向LCD1602写数据

{

rs_h;

rw_l;

PORT=dat;

delayms(1);

en_h;

delayms(1);

en_l;

}

void lcd_write(uchar c,uchar r,uchar dat)//向LCD1602指定行、指定列、写数据

{

lcd_com(0x80+0x40*c+r);

lcd_dat(dat);

delayms(1);

}