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PIC16F877A & RS232 RFID READER, HiTech C

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reachrajesh

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This codes only works for first input, for 2nd input onwards, it does not working.....


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/************************ RFID BASED ELECTRONIC TOLL GATE SYSTEM **********************************************/
 
#include<htc.h>
#include<pic16f877a.h>
 
#include<string.h>
#include<stdio.h>
#define _XTAL_FREQ 20e6
 
 
 
//========================================================================
//  Configuration
//========================================================================
__CONFIG ( 0x3F32 );                //configuration for the  microcontroller
 
 
//=========================================================================                                 
//  Define
//=========================================================================
#define rs          RC0             //RS pin of the LCD display
#define rw          RC1             //R/W pin of the LCD display    
#define e           RC2             //E pin of the LCD display
#define lcd_data    PORTB           //LCD 8-bit data PORT
 
 
 
//===========================================================================
//  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);
 
 
 
//===========================================================================
//  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[12]={"0003475374"};      //define the Tag ID here
    unsigned char id_2[12]={"0003471976"};      //change this ID to the tag ID that user want to read
    
    unsigned char user_1[10]={"USER1-WCM"}; //define the Tag user here
    unsigned char user_2[10]={"USER2-WCM"}; //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
    
 
    
    //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
 
    
    lcd_clr();                          //clear lcd
    lcd_goto(0);                        //set the lcd cursor to location 0
    send_string("RFID");        //display welcome note
    lcd_goto(20);                       //set the lcd cursor to location 20
    send_string("TOLL COLLECTION");         //display welcome note
 
    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
 
 
                
        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
        
                lcd_goto(0X01);                             //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
            
                break;
            case 2:                                         //id_2 match
        
                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 
            
                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"
            
                break;
        }
        delay(300000);                                      //delay
 
    }
        
}
 
//===========================================================================
//  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
}

 

Re: PIC16F877A &amp; RS232 RFID READER, HiTech C

any one tell me why this code is not working for second input..

- - - Updated - - -

any one tell me why this code is not working for second input..
 

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