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Đây là 1 đoạn code chương trình con trong code đồng hồ thời gian thực :
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/****************
toàn bộ code của nó đây :
void IRS_1000ms interrupt 1 //hàm ngắt timer 0 :tạo xung 1ms
{
TF0=0;
TH0=0xe5;
TL0=0xF8;
TR0=1;
millisec++;
millisec2++;
if(millisec==0xFFFD)
millisec=0;
if(millisec%1000=0)
Led=~led; // led nhấp nháy
{
TF0=0;
TH0=0xe5;
TL0=0xF8;
TR0=1;
millisec++;
millisec2++;
if(millisec==0xFFFD)
millisec=0;
if(millisec%1000=0)
Led=~led; // led nhấp nháy
TH0=0xe5;
TL0=0xF8;
....
if(millisec==0xFFFD)
millisec=0;
TL0=0xF8;
....
if(millisec==0xFFFD)
millisec=0;
/****************
toàn bộ code của nó đây :
Code:
*/
#include <REGX52.H>
#define Menu P3_0 //phim menu de chon che do chinh thoi gian
#define Next P3_1 //phim next de tang thoi gian
#define Back P3_2 //phim back de giam thoi gian
#define Timer_Date P3_3 //phim de chuyen che do hien thi
#define SCL P3_5
#define SDA P3_6
#define LedCPU P0_0
#define OffLed {P1=0x00,P2=0xFF;}
//dinh nghia dia chi cac thanh ghi trong DS1307
#define SEC 0x00
#define MIN 0x01
#define HOUR 0x02
#define DATE 0x03
#define DAY 0x04
#define MONTH 0x05
#define YEAR 0x06
//cac ham dung cho DS1307
void I2C_Start(); //khoi dong cho DS1307
void I2C_stop();
unsigned char I2C_write(unsigned char dat); //ham ghi 1 byte du kieu vao DS1307
unsigned char I2C_read(); //ham doc 1 byte du kieu vao DS1307
unsigned char DS1307_Read(unsigned char addr); //ham doc du lieu tu 1 thanh ghi bat ky
void DS1307_write(unsigned char addr,unsigned char dat); //ham ghi du lieu tu 1 thanh ghi bat ky
void Write_DS1307(); //ham cai dat thoi gian vao DS1307
void Read_DS1307(); //ham doc thoi gian vao DS1307
void Convert_Number(); //ham chuyen doi tach so de hien thi tren led 7 thanh
void Display_Gio_Phut_Giay(); //ham hien thi gio phut giay tren led 7 thanh
void Display_Ngay_Thang_Nam(); //ham hien thi ngay thang nam
void ScanKey(); //ham quet phim nhan
//khai bao bien
unsigned char Mang[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
unsigned char SoGioHangChuc,SoGioHangDonVi,SoPhutHangChuc,SoPhutHangDonVi,SoGiayHangChuc,SoGiayHangDonVi;
unsigned char SoNgayHangChuc,SoNgayHangDonVi,SoThangHangChuc,SoThangHangDonVi,SoNamHangChuc,SoNamHangDonVi;
unsigned int Millisec,Millisec2; //bien dem ms
char sec,hour,min,day,date,month,year; //cac bien dem gio phut giay....
unsigned char kt_sec; //bien kiem tra xem RTC co hoat dong khong
unsigned char kt_sec2;
unsigned char kt_menu; //bien vao cac che do chinh thoi gian
bit bTimer; //kiem tra trang thai hien thi
//cac ham khai bao
void delay_ms(unsigned int ms)
{
unsigned int i,j;
for(i=0;i<ms;i++)
for(j=0;j<121;j++);
}
void ISR_1000ms(void) interrupt 1 // ham ngat timer 0 :1ms
{
TF0 = 0;//xoa co tran
TH0 =0xE5; // nap du lieu vao thanh ghi timer
TL0 =0xF8;
TR0=1;
Millisec++;
Millisec2++;
if(Millisec==0xFFFD)
Millisec=0;
if(Millisec%1000==0)
LedCPU=~LedCPU;
}
//ham quet led hien thi gio phut giay
void Display_Gio_phut_giay()
{
P1=1; // led thu nhat sang
P2=Mang[SoGioHangChuc]; //xuat du lieu ra led thu nhat
delay_ms(2); //tre 1ms
P1=2;
P2=Mang[SoGioHangDonVi];
delay_ms(2);
P1=4;
P2=0xBF;
delay_ms(2);
P1=8;
P2=Mang[SoPhutHangChuc];
delay_ms(2);
P1=16;
P2=Mang[SoPhutHangDonVi];
delay_ms(2);
P1=32;
P2=0xBF;
delay_ms(2);
P1=64;
P2=Mang[SoGiayHangChuc];
delay_ms(2);
P1=128;
P2=Mang[SoGiayHangDonVi];
delay_ms(2);
OffLed;
}
//ham quet led hien thi ngay thang nam
void Display_Ngay_Thang_Nam()
{
P1=1;
P2=Mang[SoNgayHangChuc];
delay_ms(2);
P1=2;
P2=Mang[SoNgayHangDonVi];
delay_ms(2);
P1=4;
P2=0xBF;
delay_ms(2);
P1=8;
P2=Mang[SoThangHangChuc];
delay_ms(2);
P1=16;
P2=Mang[SoThangHangDonVi];
delay_ms(2);
P1=32;
P2=0xBF;
delay_ms(2);
P1=64;
P2=Mang[SoNamHangChuc];
delay_ms(2);
P1=128;
P2=Mang[SoNamHangDonVi];
delay_ms(2);
OffLed;
}
void Convert_Number()
{
SoNgayHangChuc=day/10;
SoNgayHangDonVi=day%10;
SoThangHangChuc=month/10;
SoThangHangDonVi=month%10;
SoNamHangChuc=year/10;
SoNamHangDonVi=year%10;
SoGiayHangChuc=sec/10;
SoGiayHangDonVi=sec%10;
SoPhutHangChuc=min/10;
SoPhutHangDonVi=min%10;
SoGioHangChuc=hour/10;
SoGioHangDonVi=hour%10;
}
//chuong trinh chinh
void main(void)
{
Read_DS1307(); //doc thoi gian tu DS1307
kt_sec=sec; //luu giay vao 1 bien kt_sec
delay_ms(2000);
Read_DS1307();//tre 1 khoang thoi gian sau do doc tiep
kt_sec2=sec;
if(kt_sec==kt_sec2) //nguoc lai neu DS1307 chua chay thi phai set thoi gian
{
sec=8;min=7;hour=7;day=9;month=10;year=12;date=7;
Write_DS1307();// ghi du lieu vao DS1307
}
//khoi tao cho bo dem timer
TCON=0x01; // che do 16 bit tu nap lai
TR0=1; //cho phep timer hoat dong
TH0=0xfc;
TL0=0x18; //nap gia tri dem cho thanh ghi timer 0
TR0=1; // cho phép timer 0 hoat dong
TF0=0; //xoa co ngat
EA=1; //cho phep ngat
ET0=1; //cho phep ngat timer 0
while (1)
{
ScanKey();
if(Millisec>=200)
{
Convert_Number(); //cu 100 ms thi chuyen doi 1 lan
Millisec=0;
}
if(bTimer==1&&kt_menu==0) //trong che do hien thi ngay thang nam
{
if(Millisec2>=500) //500ms doc thoi gian tu DS1307 1 lan
{
LedCPU=~LedCPU; //nhap nhay den led
Millisec2=0;
Read_DS1307(); //doc thoi gian tu DS1307
}
Display_Ngay_Thang_Nam();//hien thi ngay thang nam len led 7 thanh
}
else if(bTimer==0&&kt_menu==0) //trong che do gio phut giay
{
if(Millisec2>=500)
{
LedCPU=~LedCPU; //nhap nhay den led
Millisec2=0;
Read_DS1307();
}
Display_Gio_Phut_Giay(); //hien thi gioi phut giay tren led 7thanh
}
}
}
void ScanKey()
{
if(Menu==0)//neu phim menu duoc nhan
{
delay_ms(500);
kt_menu++; //bien luu trang thai menu hien tai
Write_DS1307();//cu moi lan nhan phim thi phai ghi du lieu vao DS1307
if(kt_menu==7)
{
kt_menu=0; //tro ve trang thai hien thi thoi gian binh thuong
}
while(Menu==0);//cho khi nao nha phim menu
}
if(Timer_Date==0)
{
delay_ms(20);
bTimer=~bTimer;
while(Timer_Date==0);
}
if(kt_menu!=0)
{
switch(kt_menu)
{
case 1: //chinh thoi gian ngay
{
if(Back==0)
{
delay_ms(20);
day--;
if(day<=0)
day=31;
while(Back==0);
}
else if(Next==0)
{
delay_ms(20);
day++;
if(day>=32)
day=1;
while(Next==0);
}
P1=1;
P2=Mang[SoNgayHangChuc];
delay_ms(1);
P2=2;
P2=Mang[SoNgayHangDonVi];
delay_ms(1);
OffLed;
}
break;
case 2: //chinh thang
{
if(Back==0)
{
delay_ms(20);
month--;
if(month<=0)
month=12;
while(Back==0);
}
else if(Next==0)
{
delay_ms(20);
month++;
if(month>=13)
month=1;
while(Next==0);
}
P1=8;
P2=Mang[SoThangHangChuc];
delay_ms(1);
P1=16;
P2=Mang[SoThangHangDonVi];
delay_ms(1);
OffLed;
}
break;
case 3: //chinh nam
{
if(Back==0)
{
delay_ms(20);
year--;
if(year<=0)
year=99;
while(Back==0);
}
else if(Next==0)
{
delay_ms(20);
year++;
if(month>=100)
year=0;
while(Next==0);
}
P1=64;
P2=Mang[SoNamHangChuc];
delay_ms(1);
P1=128;
P2=Mang[SoNamHangDonVi];
delay_ms(1);
OffLed;
}
break;
case 4: //chinh gio
{
if(Back==0)
{
delay_ms(20);
hour--;
if(hour<=0)
hour=23;
while(Back==0);
}
else if(Next==0)
{
delay_ms(20);
hour++;
if(hour>=24)
hour=0;
while(Next==0);
}
P1=1;
P2=Mang[SoGioHangChuc];
delay_ms(1);
P1=2;
P2=Mang[SoGioHangDonVi];
delay_ms(1);
OffLed;
}
break; //chinh phut
case 5:
{
if(Back==0)
{
delay_ms(20);
min--;
if(min<=0)
min=59;
while(Back==0);
}
else if(Next==0)
{
delay_ms(20);
min++;
if(min>=60)
min=0;
while(Next==0);
}
P1=8;
P2=Mang[SoPhutHangChuc];
delay_ms(1);
P1=16;
P2=Mang[SoPhutHangDonVi];
delay_ms(1);
OffLed;
}
break;
case 6: //chinh giay
{
if(Back==0)
{
delay_ms(20);
sec--;
if(sec<=0)
sec=59;
while(Back==0);
}
else if(Next==0)
{
delay_ms(20);
sec++;
if(sec>=60)
sec=0;
while(Next==0);
}
P1=64;
P2=Mang[SoGiayHangChuc];
delay_ms(1);
P1=128;
P2=Mang[SoGiayHangDonVi];
delay_ms(1);
OffLed;
}
break;
}
}
}
//******************************************************************************
// CAC CHUONG TRINH CON CHO I2C
//******************************************************************************
void I2C_start() //ham khoi dong I2C
{
SCL = 1;
SCL = 0;
SDA = 1;
SCL = 1;
SDA = 0;
SCL = 0;
}
void I2C_stop()
{
SCL = 1; //keo chan SDA len 1
SCL = 0;
SDA = 0;
SCL = 1;
SDA = 1;
}
unsigned char I2C_write(unsigned char dat)//ham ghi 1 byte du lieu vao DS1307
{
unsigned char i;
for (i=0;i<8;i++)
{
SDA = (dat & 0x80); ///? 1:0;
SCL=1;
SCL=0;
dat<<=1;
}
SCL = 1;
SCL = 0;
return dat;
}
unsigned char I2C_read(void)
{
bit rd_bit;
unsigned char i, dat;
dat = 0x00;
for(i=0;i<8;i++) /* For loop read data 1 byte */
{
SCL = 1;
rd_bit = SDA; /* Keep for check acknowledge */
dat = dat<<1;
dat = dat | rd_bit; /* Keep bit data in dat */
SCL = 0; /* Clear SCL */
}
return dat;
}
// CAC CHUONG TRINH CON CHO DS1307
//******************************************************************************
unsigned char DS1307_read(unsigned char addr)
{
unsigned int temp,ret;
I2C_start(); /* Start i2c bus */
I2C_write(0xD0); /* Connect to DS1307 */
I2C_write(addr); /* Request RAM address on DS1307 */
I2C_start(); /* Start i2c bus */
I2C_write(0XD1); /* Connect to DS1307 for Read */
ret = I2C_read(); /* Receive data */
I2C_stop();
//**********************************************************
temp = ret; /*BCD to HEX*/
ret = (((ret/16)*10)+ (temp & 0x0f)); /*for Led 7seg*/
//**********************************************************
return ret;
}
void DS1307_Write(unsigned char addr,unsigned char dat)
{
unsigned int temp;
//**********************************************
temp = dat ; /*HEX to BCD*/
dat = (((dat/10)*16)|(temp %10)); /*for Led 7seg*/
//**********************************************
I2C_start(); /* Start i2c bus */
I2C_write(0XD0); /* Connect to DS1307 */
I2C_write(addr); /* Request RAM address on DS1307 */
I2C_write(dat); /* Connect to DS1307 for Read */
I2C_stop();
}
void Read_DS1307()
{
sec = DS1307_read(SEC); //doc giay tu DS1307
min = DS1307_read(MIN); //doc phut tu DS1307
hour = DS1307_read(HOUR); //doc gio tu DS1307
day = DS1307_read(DAY); //doc ngay tu DS1307
date = DS1307_read(DATE); //doc thu tu DS1307
month = DS1307_read(MONTH); //doc thang tu DS1307
year = DS1307_read(YEAR); //doc nam tu DS1307
}
void Write_DS1307()
{
DS1307_Write(SEC,sec); //ghi du lieu vao thanh ghi giay
DS1307_Write(MIN,min); //ghi du lieu vao thanh ghi phut
DS1307_Write(HOUR,hour); //ghi du lieu vao thanh ghi gio
DS1307_Write(DAY,day); //ghi du lieu vao thanh ghi ngay
DS1307_Write(DATE,date); //ghi du lieu vao thanh ghi thu
DS1307_Write(MONTH,month); //ghi du lieu vao thanh ghi thang
DS1307_Write(YEAR,year); //ghi du lieu vao thanh ghi nam
}
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