//-------------- DEFINE THE I/O PIN ------------------------------------
#define RS RA2 //RS pin of the LCD display
#define E RA3 //E pin of the LCD display
#define lcd_data PORTD
#define d0 RD0
#define d1 RD1
#define d2 RD2
#define d3 RD3
#define d4 RD4
#define d5 RD5
#define d6 RD6
#define d7 RD7
#define buzzer RC1
#define SW1 RB0
//-------------- DEFINE VARIABLE DEFINITION --------------------------
//-------------- FUNCTION PROTOTYPE ----------------------------------
void delay(unsigned long a);
void e_pulse(void);
void lcd_clr(void);
void lcd_goto(unsigned char data);
void send_char(unsigned char data);
void send_config(unsigned char data);
void send_string(const char *s);
//-------------- MAIN FUNCTION (WRITE YOUR PROGRAM HERE) --------------
void main()
{ //set I/O input output
TRISA=0b00000000; //Configure PORTA I/O direction
TRISB=0b00000111; //Configure PORTB I/O direction
TRISC=0b00000000;
PORTC=0b00000000;
TRISD=0b00000000;
TRISE=0b00000000;
PORTA=0;
PORTB=0;
PORTC=0;
PORTD=0;
PORTE=0;
//Configure PORTD I/O direction
//setup ADC
ADCON1=0b00000110;
//set RA2, RA3 as digital and rest remain as analog I/O.
//Ensure pin share with analog is being configured to digital correctly
//Configure the LCD
send_config(0b00000001); //clear the LCD.
send_config(0b00000010); //Return cursor to home.
send_config(0b00000110); //Entry mode, cursor increase 1.
send_config(0b00001100); //Display on,cursor off and cursor blink off.
send_config(0b00111000); //Function set.
lcd_clr(); //Clear the LCD.
lcd_goto(0); //Put cursor on position 0.
send_string("PRESS BUTTON");
lcd_goto(20); //Put cursor on position 11.
send_string("TO RING");
b_light=1;
while(1)
{
if(SW1==0)
{
while(SW1==0);
lcd_clr();
lcd_goto(0);
send_string("WELCOME TO");
lcd_goto(20);
send_string("OUR HOUSE");
buzzer = 1;
delay(90000);
}
else
{
lcd_clr();
lcd_goto(0);
send_string("PRESS BUTTON");
lcd_goto(22);
send_string("TO RING");
buzzer = 0;
delay(1);
}
}
}
//Delay function. The delay time depends on the given value.
void delay(unsigned long a)
{
for(a=0xFF;a!=0;a--) ;
}
void e_pulse(void
{
E=1;
delay(50);
E=0;
delay(50);
} //Send a pulse to the E pin of the LCD.
//Send the configuration to the LCD.
void send_config(unsigned char data)
{
unsigned char test;
unsigned char i;
RS=0;
for(i=0;i<8;i++) .
{
test=(data>>i)&0b00000001;
switch(i)
{
case 0:
if(test==1)
d0=1;
else d0=0;
case 1:
if(test==1)
d1=1;
else d1=0;
case 2:
if(test==1)
d2=1;
else d2=0;
case 3:
if(test==1)
d3=1;
else d3=0;
case 4:
if(test==1)
d4=1;
else d4=0;
case 5:
if(test==1)
d5=1;
else d5=0;
case 6:
if(test==1)
d6=1;
else d6=0;
case 7:
if(test==1)
d7=1;
else d7=0;
}
}
delay(50);
e_pulse();
}
//Clear the LCD
void lcd_clr(void)
{
send_config(0x01);
delay(600);
}
//Set the location of the LCD cursor.
//If the given value is (0-15) the cursor will be at the upper line.
//If the given value is (20-35) the cursor will be at the lower line.
//Location of the lcd cursor (2x16):
// ----------------------------------------------------------
// ||00|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15||
// ||20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35||
void lcd_goto(unsigned char data)
{
if(data<16)
{
send_config(0x80+data);
}
else
{
data=data-20 ;
send_config(0xC0+data);
}
delay(200);
}
//Send a character to the LCD.
void send_char(unsigned char data)
{
unsigned char test;
unsigned char i;
RS=1;
//Set RS for data mode.
for(i=0;i<8;i++) //Loop for 8 times.
{
test=(data>>i)&0b00000001;
switch(i)
{
case 0:
if(test==1)
d0=1;
else
d0=0;
case 1:
if(test==1)
d1=1;
else
d1=0;
case 2:
if(test==1)
d2=1;
else
d2=0;
case 3:
if(test==1)
d3=1;
else
d3=0;
case 4:
if(test==1)
d4=1;
else
d4=0;
case 5:
if(test==1)
d5=1;
else
d5=0;
case 6:
if(test==1)
d6=1;
else
d6=0;
case 7:
if(test==1)
d7=1;
else
d7=0;
}
}
delay(50);
e_pulse();
}
//Send a string to the LCD.
void send_string(const char *s)
{
unsigned char i=0;
while(s&&*s)
send_char(*s++);
delay(1000);
}
