Display Real Time Clock (RTC) on LCD
Pelajari penampilan RTC di LCD.
Description: PR12 is an open source microcontroller Do It Yourself kit. This PIC microcontroller based project uses PIC16F876A to interface with DS1307, getting real time clock (up second) and display it on 16×2 LCD. It will be fun when user have the ability to modify the setting exactly same as your watch, all DIY. It demonstrates the approach to interface with DS1307 through I2C protocol and the programming algorithm to read/write through I2C. This RTC also have back up battery to keep the time. Cytron Technologies uploaded this project with the aim to assist hobbyist and students to pick up embedded system application and development. Download the Details Description, Sample Source, Schematic and necessary material under Useful Document. Utilize your time and enjoy it!
Features:
- DS1307 real time chip
- Back up battery for at least 1 year
- Industrial Grade PCB with proper labeling
- ICSP socket to ease the loading program
- Open Source DIY kit (schematic, source code and explanation)
- Simple, fast and reliable learning tools
Harga kit ini Rp 2.500.000 lengkap dengan kode demo.
//=============================================================================================
// include
//=============================================================================================
#include <pic.h>
#include “i2c.h”
#include “i2c_rtc.h”
//==========================================================================================
// configuration
//=========================================================================================
__CONFIG ( 0×3F32 );
//==========================================================================================
// define
//==========================================================================================
#define sw0 RC0
#define sw1 RC1
#define sw2 RC2
#define rs RA0
#define e RA1
#define led_yellow RA2
#define led_white RA3
#define lcd_data PORTB
#define sdata RC4 // SDA
#define tclk RC3 // SCL
//===========================================================================================
// global variable
//===========================================================================================
unsigned char step=0;
unsigned char store=0;
unsigned char clksec=0;
unsigned char clkmin=0;
unsigned char clkhrs=0;
unsigned char day=0;
unsigned char date=0;
unsigned char month=0;
unsigned char year=0;
unsigned char secondh=0;
unsigned char secondl=0;
unsigned char minutesh=0;
unsigned char minutesl=0;
unsigned char hourh=0;
unsigned char hourl=0;
unsigned char dateh=0;
unsigned char datel=0;
unsigned char monthh=0;
unsigned char monthl=0;
unsigned char yearh=0;
unsigned char yearl=0;
//==============================================================================================
// function prototype
//==============================================================================================
void delay(unsigned long data);
void send_config(unsigned char data);
void send_char(unsigned char data);
void e_pulse(void);
void lcd_goto(unsigned char data);
void lcd_clr(void);
void send_string(const char *s);
void send_dec(unsigned long data,unsigned char num_dig);
void writertc(void);
void readrtc(void); // Read RTC
//============================================================================================
// main function
//============================================================================================
void main(void)
{
i2c_initialize();
i2c_rtc_initialize();
unsigned char i;
ADCON1 = 0b00000110; //set all portA as digital I/O
TRISA = 0b00000000; //set all PORTA pin as OUTPUT
TRISB = 0b00000000; //set all PORTB pin as output
TRISC = 0b00011111; //set all PORTC pin as output
led_white=0; //led white off
led_yellow=0; //led yellow off
send_config(0b00000001); //clear display at lcd
send_config(0b00000010); //Lcd Return to home
send_config(0b00000110); //entry mode-cursor increase 1
send_config(0b00001100); //diplay on, cursor off and cursor blink off
send_config(0b00111000); //function
readrtc();
}
//================================================================================================
// Write to RTC function
//================================================================================================
void writertc(void)
{
led_yellow=0; //led yellow off
led_white=1; //led white on
while(sw0==0)continue; //waiting sw0 to depress
// SET HOUR ===========================================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
lcd_goto(0); //maintain current hour value on LCD and make it blinking
send_dec(clkhrs,2);
delay(10000);
lcd_goto(1);
send_char(‘ ‘);
lcd_goto(0);
send_char(‘ ‘);
delay(10000);
}
if(sw1==0) //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(clkhrs<=22)clkhrs++;
else clkhrs=0;
}
}
lcd_goto(0); //overwrite changed hour value on LCD
send_dec(clkhrs,2);
while(sw0==0)continue; //wait switch 0 to be depressed
// SET MINUTES ====================================================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
lcd_goto(3); //maintain current minute value on LCD and make it blinking
send_dec(clkmin,2);
delay(10000);
lcd_goto(4);
send_char(‘ ‘);
lcd_goto(3);
send_char(‘ ‘);
delay(10000);
}
if(sw1==0) //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(clkmin<=58) clkmin++;
else clkmin=0;
}
}
lcd_goto(3); //overwrite changed minute value on LCD
send_dec(clkmin,2);
while(sw0==0)continue; //wait switch 0 to be depressed
// SET SECONDS ===============================================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
lcd_goto(6); //maintain current minute value on LCD and make it blinking
send_dec(clksec,2);
delay(10000);
lcd_goto(7);
send_char(‘ ‘);
lcd_goto(6);
send_char(‘ ‘);
delay(10000);
}
if(sw1==0) //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(clksec<=58) clksec++;
else clksec=0;
}
}
lcd_goto(6); //overwrite changed second value on LCD
send_dec(clksec,2);
while(sw0==0)continue; //wait switch 0 to be depressed
// SET DATE =========================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
lcd_goto(20); //maintain current date value on LCD and make it blinking
send_dec(date,2);
delay(10000);
lcd_goto(21);
send_char(‘ ‘);
lcd_goto(20);
send_char(‘ ‘);
delay(10000);
}
if(sw1==0) //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(date<=30) date++;
else date=1;
}
}
lcd_goto(20); //overwrite changed date value on LCD
send_dec(date,2);
while(sw0==0)continue; //wait switch 0 to be depressed
// SET MONTH ==========================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
lcd_goto(23); //maintain current month value on LCD and make it blinking
send_dec(month,2);
delay(10000);
lcd_goto(24);
send_char(‘ ‘);
lcd_goto(23);
send_char(‘ ‘);
delay(10000);
}
if(sw1==0) //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(month<=11) month++;
else month=1;
}
}
lcd_goto(23); //overwrite changed month value on LCD
send_dec(month,2);
while(sw0==0)continue; //wait switch 0 to be depressed
// SET YEAR =======================================================================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
lcd_goto(26); //maintain current month value on LCD and make it blinking
send_dec(year,2);
delay(10000);
lcd_goto(27);
send_char(‘ ‘);
lcd_goto(26);
send_char(‘ ‘);
delay(10000);
}
if(sw1==0) //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(year<=99) year++;
else year=0;
}
}
lcd_goto(26); //overwrite changed year value on LCD
send_dec(year,2);
while(sw0==0)continue; //wait switch 0 to be depressed
// SET DAY ====================================================================================
while(sw0==1) //infinity loop if switch0 is not pressed
{
if(sw1==1) //if switch 1 is not pressed
{
if(day==7) //maintain current day value on LCD and make it blinking
{
lcd_goto(31);
send_string(“SUN”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==1)
{
lcd_goto(31);
send_string(“MON”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==2)
{
lcd_goto(31);
send_string(“TUE”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==3)
{
lcd_goto(31);
send_string(“WED”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==4)
{
lcd_goto(31);
send_string(“THU”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==5)
{
lcd_goto(31);
send_string(“FRI”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==6)
{
lcd_goto(31);
send_string(“SAT”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
}
else //if switch 1 is pressed
{
while(sw1==0)continue; //wait switch1 to depress
if(day>6) //if day value greater than 11
{
day=1; //change setday variable to 1
}
else
{
day+=1; //increse day value by 1
}
}
}
if(sw1==0)
{
if(day==7) //overwrite changed day value on LCD
{
lcd_goto(31);
send_string(“SUN”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==1)
{
lcd_goto(31);
send_string(“MON”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==2)
{
lcd_goto(31);
send_string(“TUE”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==3)
{
lcd_goto(31);
send_string(“WED”);
}
else if(day==4)
{
lcd_goto(31);
send_string(“THU”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==5)
{
lcd_goto(31);
send_string(“FRI”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
else if(day==6)
{
lcd_goto(31);
send_string(“SAT”);
delay(10000);
lcd_goto(31);
send_char(‘ ‘);
send_char(‘ ‘);
send_char(‘ ‘);
delay(10000);
}
}
while(sw0==0)continue; //wait switch 0 to be depressed
i2c_rtc_set_seconds(clksec); //send changed second
i2c_rtc_set_minutes(clkmin); //send changed minute
i2c_rtc_set_hours(clkhrs); //send changed hour
i2c_rtc_set_day(day); //send changed day
i2c_rtc_set_date(date); //send changed date
i2c_rtc_set_month(month); //send changed month
i2c_rtc_set_year(year); //send changed year
}
//===================================================================================
// Read RTC function
//===================================================================================
void readrtc(void)
{
while(1)
{
led_yellow=1;
led_white=0;
if(sw0==0) //reset button
{
writertc(); //goto write mode
}
else
{
clksec=uc_i2c_rtc_get_seconds(); //read 1 byte seconds
clkmin= uc_i2c_rtc_get_minutes(); //read 1 byte min
clkhrs=uc_i2c_rtc_get_hours(); //read 1 byte hrs
day=uc_i2c_rtc_get_day(); //read 1 byte day
date=uc_i2c_rtc_get_date(); //read 1 byte date
month=uc_i2c_rtc_get_month(); //read 1 byte month
year=uc_i2c_rtc_get_year(); //read 1 byte year
lcd_goto(0);
send_dec(clkhrs,2);
lcd_goto(2); //display ‘:’
send_char(0×3A);
lcd_goto(3);
send_dec(clkmin,2);
lcd_goto(5); //display ‘:’
send_char(0×3A);
lcd_goto(6);
send_dec(clksec,2);
if(day==7) // display day
{
lcd_goto(31);
send_string(“SUN”);
}
else if(day==1)
{
lcd_goto(31);
send_string(“MON”);
}
else if(day==2)
{
lcd_goto(31);
send_string(“TUE”);
}
else if(day==3)
{
lcd_goto(31);
send_string(“WED”);
}
else if(day==4)
{
lcd_goto(31);
send_string(“THU”);
}
else if(day==5)
{
lcd_goto(31);
send_string(“FRI”);
}
else if(day==6)
{
lcd_goto(31);
send_string(“SAT”);
}
lcd_goto(20); // display date
send_dec(date,2);
lcd_goto(22); //display ‘/’
send_char(0×2F);
lcd_goto(23); // display month
send_dec(month,2);
lcd_goto(25); // display ‘/’
send_char(0×2F);
lcd_goto(26); // display year
send_dec(year,2);
}
}
}
//==========================================================================
// LCD functions
//==========================================================================
void delay(unsigned long data)
{
for( ;data>0;data-=1);
}
void send_config(unsigned char data)
{
rs=0; //clear rs into config mode
lcd_data=data;
delay(300);
e_pulse();
}
void send_char(unsigned char data)
{
rs=1; //set rs into write mode
lcd_data=data;
delay(300);
e_pulse();
}
void e_pulse(void)
{
e=1;
delay(300);
e=0;
delay(300);
}
void lcd_goto(unsigned char data)
{
if(data<16)
{
send_config(0×80+data);
}
else
{
data=data-20;
send_config(0xc0+data);
}
}
void lcd_clr(void)
{
send_config(0×01);
delay(350);
}
void send_string(const char *s)
{
unsigned char i=0;
while (s && *s)send_char (*s++);
}
void send_dec(unsigned long data,unsigned char num_dig)
{
if(num_dig>=10)
{
data=data%10000000000;
send_char(data/1000000000+0×30);
}
if(num_dig>=9)
{
data=data%1000000000;
send_char(data/100000000+0×30);
}
if(num_dig>=8)
{
data=data%100000000;
send_char(data/10000000+0×30);
}
if(num_dig>=7)
{
data=data%10000000;
send_char(data/1000000+0×30);
}
if(num_dig>=6)
{
data=data%1000000;
send_char(data/100000+0×30);
}
if(num_dig>=5)
{
data=data%100000;
send_char(data/10000+0×30);
}
if(num_dig>=4)
{
data=data%10000;
send_char(data/1000+0×30);
}
if(num_dig>=3)
{
data=data%1000;
send_char(data/100+0×30);
}
if(num_dig>=2)
{
data=data%100;
send_char(data/10+0×30);
}
if(num_dig>=1)
{
data=data%10;
send_char(data+0×30);
}
}
