Page 2 - 18F4520 with IDR 232N RFID reader

//========================================================================
//	Author				: Cytron Technologies		
//	Project				: DIY Project (PR8-RFID door security)
//	Project description	: Scan RFID tag and display the ID and user
//						  on lcd display
//	Version				: 1.1 Bug - Scanning Continuosly Hang Solve
//						  1.2 Upgrade Source code using new RFID Protocol
//========================================================================


//========================================================================
//	include
//========================================================================
#include <pic.h> 


//========================================================================
//	Configuration
//========================================================================
__CONFIG ( 0x3F32 );				//configuration for the  microcontroller


//=========================================================================									
//	Define
//=========================================================================
#define	rs			RC3				//RS pin of the LCD display
#define	rw			RC2				//R/W pin of the LCD display	
#define	e			RC4				//E pin of the LCD display
#define	b_light		RC1				//backlight of the LCD display (1 to on backlight)
#define	buzzer		RC0				//buzzer (1 to on buzzer)
#define	button1		RA0				//button (active low)
#define	button2		RA1				//button (active low)
#define	lcd_data	PORTB			//LCD 8-bit data PORT
#define	led1		RA2				//led 1 (active high)
#define	led2		RA3				//led 2 (active high)


//===========================================================================
//	Function prototype				(every function must have a function prototype)
//===========================================================================
void delay(unsigned long data);			
void send_config(unsigned char data);
void send_char(unsigned char data);
void lcd_goto(unsigned char data);
void lcd_clr(void);
void send_string(const char *s);
unsigned char uart_rec(void);
void beep(void);


//===========================================================================
//	Main function					(main fucntion of the program)
//===========================================================================
void main(void)
{
	//assign variable
	unsigned char i,temp,database;				
	unsigned char data[12];						//12 bytes of data received from RFID Reader.
												//The data include start of heading, RFID ID, 
												//and start of text
	
	unsigned char id_1[10]={"0002393929"};		//define the Tag ID here
	unsigned char id_2[10]={"0000797447"};		//change this ID to the tag ID that user want to read
	
	unsigned char user_1[10]={"Joseph    "};	//define the Tag user here
	unsigned char user_2[10]={"Mary      "};	//change this user name to the tag ID owner name

	//set I/O input output
	TRISB = 0b00000000;					//configure PORTB I/O direction
	TRISC = 0b10000000;					//configure PORTC I/O direction
	TRISA = 0b11110011;					//configure PORTA I/O direction
	
	//setup USART
	SPBRG = 0x81;						//set baud rate to 9600 for 20Mhz
	BRGH = 1;							//baud rate high speed option
	TXEN = 1;							//enable transmission
	CREN = 1;							//enable reception
	SPEN = 1;							//enable serial port
	
	//setup ADC
	ADCON1 = 0b00000110;				//set ADx pin digital I/O
	
	//configure lcd
	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);			//display on, cursor off and cursor blink off
	send_config(0b00111000);			//function set
			
	//set initial condition
	buzzer=0;							//off buzzer
	b_light=1;							//on backlight	
	led1=0;								//off led 1
	led2=0;								//off led 2
	
	lcd_clr();							//clear lcd
	lcd_goto(0);						//set the lcd cursor to location 0
	send_string("   RFID door");		//display welcome note
	lcd_goto(20);						//set the lcd cursor to location 20
	send_string("   security");			//display welcome note
	
	beep();								//initial beep
	delay(200000);						//delay for display the welcome note

	//infinity loop 
	while(1)	
	{
		CREN = 1;								//enable reception from UART
		lcd_clr();								//clear lcd
		lcd_goto(0);							//set lcd cursor to location 0
		send_string("Place your ID");			//display note
		lcd_goto(20);							//set lcd cursor to location 20
		send_string("on the reader.");			//display note
		
		for(i=0;i<12;i+=1)data[i]=uart_rec();	//wait for 12 character data receive from RFID reader
												//The data receive are start of heading, RFID ID, 
												//and start of text

		led1=1;									//on led to indicate system is busy
				
		lcd_clr();								//clear lcd
		lcd_goto(20);							//set lcd cursor to location 20
		send_string("Processing......");		//display "Processing...."
		delay(40000);							//delay
		
		database=0;								//clear the value of database and start scanning			
		
		//comparing with the 1st id
		temp=0;									//comparing the received data with the saved id.
												//only byte 2-11 which is RFID ID data, will be used to compare between 
												//receive data and saved id.
		for(i=1;i<11;i+=1)						//comparing digit by digit
		{	
			if((data[i])!=(id_1[i-1]))temp=1;	//if the id is different from the id define above,
		}										//then set temp=1;
		if(temp==0) database=1;					//if temp=0, mean the id match, set the database=1
		
		//comparing with the 2nd id
		temp=0;									//comparing the received data with the saved id
												//only byte 2-11 which is RFID ID data, will be used to compare between 
												//receive data and saved id.
		for(i=1;i<11;i+=1)						//comparing digit by digit
		{
			if((data[i])!=(id_2[i-1]))temp=1;	//if the id is different from the id define above,
		}										//then set temp=1;
		if(temp==0) database=2;					//if temp=0, mean the id match, set the database=1		
		
		lcd_clr();								//clear lcd	
		CREN = 0;								//disable reception from UART


		switch(database)						
		{
			case 1:											//id 1 match
				led2=1;										//on led 2
				lcd_goto(0);								//set lcd cursor to location 0
				send_string("ID:");							//display "ID: "
				for(i=0;i<10;i+=1)send_char(id_1[i]);		//display tag ID
				lcd_goto(20);								//set lcd cursor to location 20
				send_string("user: ");						//display "user: "
				for(i=0;i<10;i+=1)send_char(user_1[i]);		//display user name
				beep();										//beep once
				break;
			case 2:											//id_2 match
				led2=1;										//on led 2
				lcd_goto(0);								//set lcd cursor to location 0
				send_string("ID: ");						//display "ID: "
				for(i=0;i<10;i+=1)send_char(id_2[i]);		//display tag ID
				lcd_goto(20);								//set lcd cursor to location 20
				send_string("user: ");						//display "user: "
				for(i=0;i<10;i+=1)send_char(user_2[i]);		//display user name	
				beep();										//beep once
				break;
			default:										//id doesnt match 
				lcd_goto(0);								//set lcd cursor to location 0
				send_string("ID: ");						//display "ID: "
				for(i=1;i<11;i+=1)send_char(data[i]);		//display tag ID
				lcd_goto(20);								//set lcd cursor to location 20
				send_string("user not found");				//display "user not found"
				beep();										//beep twice
				beep();
				break;
		}
		delay(300000);										//delay
		led1=0;												//off led after the process complete
		led2=0;
	}
		
}

//===========================================================================
//	Functions
//===========================================================================

void delay(unsigned long data)			//delay function, the delay time
{										//depend on the given value
	for( ;data>0;data-=1);
}

void send_config(unsigned char data)	//send lcd configuration 
{
	rw=0;								//set lcd to write mode
	rs=0;								//set lcd to configuration mode
	lcd_data=data;						//lcd data port = data
	e=1;								//pulse e to confirm the data
	delay(50);
	e=0;
	delay(50);
}

void send_char(unsigned char data)		//send lcd character
{
 	rw=0;								//set lcd to write mode
	rs=1;								//set lcd to display mode
	lcd_data=data;						//lcd data port = data
	e=1;								//pulse e to confirm the data
	delay(10);
	e=0;
	delay(10);
}

void lcd_goto(unsigned char data)		//set the location of the lcd cursor
{										//if the given value is (0-15) the 
 	if(data<16)							//cursor will be at the upper line
	{									//if the given value is (20-35) the 
	 	send_config(0x80+data);			//cursor will be at the lower line
	}									//location of the lcd cursor(2X16):
	else								// -----------------------------------------------------
	{									// | |00|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15| |
	 	data=data-20;					// | |20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35| |
		send_config(0xc0+data);			// -----------------------------------------------------	
	}
}

void lcd_clr(void)						//clear the lcd
{
 	send_config(0x01);
	delay(600);	
}

void send_string(const char *s)			//send a string to display in the lcd
{          
	unsigned char i=0;
  	while (s && *s)send_char (*s++);

}

unsigned char uart_rec(void)			//receive uart value
{
	unsigned char rec_data;
	while(RCIF==0);						//wait for data
	rec_data = RCREG;				
	return rec_data;					//return the data received
}

void beep(void)							//short beep function
{
	buzzer=1;							//on buzzer
	delay(10000);						//short delay
	buzzer=0;							//off buzzer
	delay(10000);						//short delay
}

unsigned char uart_rec(void)			//receive uart value
{
	unsigned char rec_data;
	while(PIR1bits.RCIF==0);		//wait for data
	rec_data = RCREG;				
	return rec_data;			//return the data received
}

unsigned char uart_rec(void)			//receive uart value
{
	unsigned char rec_data;
	while(RCIF==0);						//wait for data
	rec_data = RCREG;				
	return rec_data;					//return the data received
}

	int loop = 0;
	while(1)
	{
		clear_screen();
		cursor_set(0,0);
		WriteS(place_tag);
		cursor_set(1,0);
		uart_rec();  // don't care what it is, we're just counting characters in this test
		loop++;
		Write_Decimal(loop);
		Delay10KTCYx(255);
	}