đồng hồ đếm thời gian thực

[tungtot_vl]

cái này minh chưa làm mạch thật nhưng chạy mô phỏng tốt. bạn xem tạm nhé

#include<16F877a.h>
#fuses NOLVP,NOWDT,PUT,hs,NOPROTECT,NOBROWNOUT
#device 16F877a*=16 ADC=10
#include <math.h>
#use delay(clock=20000000)
//#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#use fast_io(a)
#byte porta=0x05
#use fast_io(b)
#byte portb=0x06
#use fast_io(c)
#byte portc=0x07
#use fast_io(d)
#byte portd=0x08
#use fast_io(e)
#byte porte=0x09
#define RTC_SCL PIN_B0
#define RTC_SDA PIN_B1
#bit RS = portA.0
#bit RW = portA.1
#bit E = portA.2

//#define RTC_RST PIN_B2
#use i2c(master, fast, sda=RTC_SDA, scl=RTC_SCL)
//================================================

int sec,min,hour,date,month,year,a,b;
unsigned char so[] = "0123456789";
// unsigned int led[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80};

void write_RTC(int add, BYTE data)
{
short int status;
i2c_start(); // bao hieu bat dau giao tiep i2c
i2c_write(0xd0); // dia chi thiet bi nhan
i2c_write(add); // dia chi thanh ghi
i2c_write(data); //gui data vao dia chi thanh ghi cua thiet bi nhan
i2c_stop(); // bao hieu ngung ghi
i2c_start(); // bao hieu bat dau giao tiep
status=i2c_write(0xd0); // kiem tra trang thai cua thiet bi nhan
while(status==1) // lap lai cho den khi thiet bi da nhan xong (No Ack)
{
i2c_start();
status=i2c_write(0xd0);
}
delay_us(10);
}

BYTE read_RTC(int add)
{
BYTE data;
i2c_start();
i2c_write(0xd0);
i2c_write(add);
i2c_start();
i2c_write(0xd1);
data=i2c_read(0); // No Ack
i2c_stop();
delay_ms(10);
return(data);

}
void init_RTC() // ham khoi tao eeprom
{
i2c_start(); // bao hieu bat dau giao tiep i2c
i2c_write(0xd0); // dia chi thiet bi nhan
i2c_write(0x00); // enable RTC
i2c_write(0x01);// sec // dia chi thanh ghi
i2c_write(0x00);// min //gui data vao dia chi thanh ghi cua thiet bi nhan
i2c_write(0x08);// hur
i2c_write(0x04);//day
i2c_write(0x11);// date
i2c_write(0x02);// month
i2c_write(0x09);// year
i2c_stop(); // bao hieu ngung ghi
i2c_start(); // bao hieu bat dau giao tiep
}
int rm_bcd(BYTE data) // CHUYEN BCD SANG SO NGUYEN
{
int i;

i=data;
data=(i>>4)*10;
data=data+(i<<4>>4);

return data;
}
////////////////////////////////////////////////////////////
/*Ham yeu cau goi lenh dieu khien LCD*/
void command()
{
RS = 0;
RW = 0;
E = 1;
E = 0;
delay_ms(1);
}
/*Ham yeu cau goi du lieu hien thi len LCD*/
void display()
{
RS = 1;
RW = 0;
E = 1;
E = 0;
delay_ms(1);
}

void main()
{
set_tris_b(0);
set_tris_a(0);
set_tris_c(0);
set_tris_e(0);
set_tris_d(0);
init_RTC();
while(true)
{//write_RTC(addsec,0);
// sec = read_RTC(addsec); // doc thoi gian tu RTC
// min = read_RTC(addmin);
// hour = read_RTC(addhour);
portd = 0x38; // Hai hang, ma tran dot 5*7, 8 bit interface
command();
portd = 0x0C; // Bat hien thi, tat con tro
command();
//////////////////////////////////////////////////
hour = rm_bcd(read_RTC(0x02));
min = rm_bcd(read_RTC(0x01));
sec = rm_bcd(read_RTC(0x00));
date = rm_bcd(read_RTC(0x04));
month = rm_bcd(read_RTC(0x05));
year = rm_bcd(read_RTC(0x06));
//////////////////////////////////////////////////////////////////
a = sec/10; b = sec-a*10;
portd = 0x8b; command(); portd = so[a]; display();
portd = 0x8c; command(); portd = so[b]; display();
portd = 0x8a; command(); portd = ':'; display();
///// hien thi min len LCD ////////
a = min/10; b = min-a*10;
portd = 0x88; command(); portd = so[a]; display();
portd = 0x89; command(); portd = so[b]; display();
portd = 0x87; command(); portd = ':'; display();
///// hien thi sec len LCD ////////
a = hour/10; b = hour-a*10;
portd = 0x85; command(); portd = so[a]; display();
portd = 0x86; command(); portd = so[b]; display();

///////////////////////////////////
a = year/10; b = year-a*10;
portd = 0xcb; command(); portd = so[a]; display();
portd = 0xcc; command(); portd = so[b]; display();
portd = 0xca; command(); portd = '-'; display();
///// hien thi min len LCD ////////
a = month/10; b = month-a*10;
portd = 0xc8; command(); portd = so[a]; display();
portd = 0xc9; command(); portd = so[b]; display();
portd = 0xc7; command(); portd = '-'; display();
///// hien thi sec len LCD ////////
a = date/10; b = date-a*10;
portd = 0xc5; command(); portd = so[a]; display();
portd = 0xc6; command(); portd = so[b]; display();


}

}