Parallex RFID_PIC16f877a_LCD_Hi Tech C

[Jaden Ng]

Hi guys,
I need your help to provide me a HTC code that can relate the RFID to my LCD.i want the RFID reader to read the RFID tag’s code and send it to my lcd to display out the code.
I have uploaded the picture of my RFID

 

RFID model:Parallex RFID

http://www.trossenrobotics.com/store/p/5378-Parallax-RFID-Card-Reader-Serial-.aspx

RFID datasheet:

http://www.parallax.com/dl/docs/prod/audiovis/RFID-Reader-v1.1.pdf

 

this is my simple code to show character in display but how to do to make the lcd show out the code when RFID tag is sensed by RFID reader.

Code:

/*————————– BEGIN —————————-*/
#include<htc.h>
__CONFIG(0x3F39);
#define _XTAL_FREQ 4e6
#define RS RC4
#define EN RC5
#define databits PORTB

/*—————-PORT SETTINGS——————-*/
void pic_init()
    {
     TRISC4=0;
     TRISC5=0;
     TRISB=0;
    }

/*—————–LCD FUNCTIONS ———————-*/
void LCD_STROBE(void)
    {
    EN = 1;
    __delay_us(0.5);
    EN = 0;
    }
void data(unsigned char c)
    {
    RS=1;
    __delay_us(40);
     databits = ( c >> 4 );
    LCD_STROBE();
    databits = ( c );
    LCD_STROBE();
    }
void cmd(unsigned char c)
    {
     RS=0;
    __delay_us(40);
    databits = ( c >> 4 );
    LCD_STROBE();
    databits = ( c  );
    LCD_STROBE();
  __delay_ms(2);
    }
void clear(void)
    {
     cmd(0x01);
    __delay_ms(2);
    }
void lcd_init()
    {
    __delay_ms(20);
    cmd(0x28 );
    __delay_ms(1);
    cmd(0x28 );
    __delay_ms(1);
    cmd(0x28 );
    cmd(0x28 ); // Function set (4-bit interface, 2 lines, 5*7Pixels)
    cmd(0x0c); // Make cursorinvisible
    clear(); // Clear screen
    cmd(0b00000110); // Set entry Mode(auto increment of cursor)
    }
void string(const char *q)
    {
    while(*q)
  {

   data(*q++);
  }
    }

/*——————MAIN FUNCTION———————–*/
main()
    {
    __delay_ms(50);
    pic_init();
    lcd_init();
    while(1)
        {
        cmd(0x83);
        string(“Blind Audio”);
        cmd(0xc0);
        string(“Guidance System”);
        while(1);
        }
    }
/*—————- END ————————–*/

 

 

 

 

 

 

 

 

 

[nikhiljain]

There are good tutorial available for the same on this site. Try those, the convepts remain  the same.

[Jaden Ng]

wysiwyg_imageupload:2839:wysiwyg_imageupload:2840:wysiwyg_imageupload:2842:

#include<htc.h>
#define _XTAL_FREQ 4e6
__CONFIG(0x3F39);
#define RS RC4
#define EN RC5
#define databits PORTB

unsigned char i=0;
unsigned char data[]=”Blind ID No.”;
unsigned char tag_id[12];

void usrt_init()
{
TXEN=1;
SYNC=0;
BRGH=0; // low baud rate
SPBRG=25; //baud rate 2400
TRMT=1;
SPEN=1;
CREN=1;
}

void interrupt_enable()
{
GIE=1;
PEIE=1;
RCIE=1;
}

void interrupt UART() //interrupt service routine
{
 tag_id=RCREG;
 i++;
}

void LCD_STROBE(void)
{
EN = 1;
__delay_us(2);
EN = 0;
}

void lcddata(unsigned char c)
{
RS = 1;
__delay_us(50);
databits = (c >> 4);
LCD_STROBE();
databits = (c);
LCD_STROBE();
}

void cmd(unsigned char c)
{
RS = 0;
__delay_us(50);
databits = (c >> 4);
LCD_STROBE();
databits = (c);
LCD_STROBE();
}

void clear(void)
{
cmd(0x01);
__delay_ms(2);
}

void lcd_init()
{
__delay_ms(15);
cmd(0x28);
__delay_ms(1);
cmd(0x28);
__delay_us(100);
cmd(0x28);
cmd(0x28); // Function set (4-bit interface, 2 lines, 5*7Pixels)
cmd(0x28); // Function set (4-bit interface, 2 lines, 5*7Pixels)
cmd(0x0c); // Make cursorinvisible
clear(); // Clear screen
cmd(0x6); // Set entry Mode(auto increment of cursor)
}

 

void main()
{
TRISB=0;
TRISC4 = 0;
TRISC5 = 0;
usrt_init();
interrupt_enable();
lcd_init();

while(data!=’’)
{
 lcddata(data);
 i++;
}
while(1)
{
 i=0;
 while(i<12);
 cmd(0xc0);
 i=0;
 while(i<12)
 {
   lcddata(tag_id);
   i++;
 }

}
}

 

 

this is my code use to detect rfid tag’s code and sdisplay with lcd.this is using hi tech c.

but some weird characters occured.what’s the problem?

i have posted the pics…

 

 

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