PIC16F877A DS1302 chip driver-EEWORLD

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#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 //Second register address
#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(fly c,fly r,fly dat);
void lcd_init(void);
void Ds1302Init(void);
void WriteByte(volatile dat);
void ReadByte(void);
float BCDtoDex(float dat);
float DextoBCD(float dat);
void ReadByte(void);
void Ds1302Write(uchar add,uchar dat);
fly Ds1302Read(fly 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); //turn off write protection
Ds1302Write(MINADD,DextoBCD(06));
Ds1302Write(HRADD,DextoBCD(19));
Ds1302Write(DATEADD,DextoBCD(20));
Ds1302Write(MONTHADD,DextoBCD(5));
Ds1302Write(ONEADD,DextoBCD(7));
Ds1302Write(YEARADD,DextoBCD(12));
Ds1302Write(SECADD,DextoBCD(30)); //Write seconds and start the clock at the same time
}
void WriteByte(uchar dat)//Rising edge output
{
flying i;
TRISC&=0xdf;
for(i=8;i>0;i--)
{
sck_l; //The data line is variable when the level is low
if(dat&0x01)
i_h;
else
I l;
sck_h;
that>>=1;
}
}
uchar BCDtoDex(uchar dat) //BCD code to decimal
{
flying i;
i=that/16;
that%=16;
i=i*10+dat;
return i;
}
uchar DextoBCD(uchar dat) //Decimal to BCD code
{
flying i;
i=that/10;
that%=10;
i=i*16+dat;
return i;
}
uchar ReadByte(void) // falling edge output
{
flying i;
flying dat;
TRISC|=0x20;
for(i=8;i>0;i--)//Consider the state after the previous writing. The first time entering this loop body, there is a falling edge.
{
that>>=1;
sck_l;
if(PORTC&0x20)
that|=0x80;
sck_h;
}
return that;
}
void Ds1302Write(uchar add,uchar dat)
{
rst_l;
sck_l;
rst_h;
WriteByte(add); //The lowest position 0 means write
WriteByte(that);
rst_l;
}
fly Ds1302Read(fly add)
{
flying dat;
rst_l;
sck_l;
rst_h;
WriteByte(add+1); //The lowest address position 1 indicates read
dat=ReadByte();
rst_l;
return that;
}
void delayms(uint x) //8M crystal oscillator, delay 1ms
{
uint y,z;
for(y=x;y>0;y--)
for(z=220;z>0;z--);
}
void lcd_init(void) //LCD1602 initialization
{
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) //write command to LCD1602
{
rs_l;
rw_l;
PORT=com;
delayms(1);
and_h;
delayms(1);
en_l;
}
void lcd_dat(uchar dat) //write data to LCD1602
{
rs_h;
rw_l;
PORT=that;
delayms(1);
and_h;
delayms(1);
en_l;
}
void lcd_write(uchar c,uchar r,uchar dat) // specify row, specify column, write data to LCD1602
{
lcd_com(0x80+0x40*c+r);
lcd_dat(dat);
delayms(1);
}

Keywords：PIC16F877A DS1302 Reference address：PIC16F877A DS1302 chip driver

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