mohammad3d
Joined: 28 Mar 2009
Posts: 17
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| RDM8800 NFC / RFID Module Driver. |
 Posted: Sat Oct 13, 2018 3:05 am |
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Hi every one.
I write a simple code for reading data from RDM8800 module via serial pin on
pic 16f877 device.
I use an 2x16 charater LCD for display UID tag number.
Just connect RDM8800 TX pin to PIC RX pin(RC7/RX pin26) and enjoy...
Main.c
| Code: |
//main.c File
#include <16F887.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage programing, B3(PIC16) or B5(PIC18) used for I/O
#FUSES XT
#use delay(crystal=4000000)//Set frequency at 4Mhz
#use rs232( baud=9600, parity=N, xmit=PIN_C6, rcv=PIN_C7, bits=8, ERRORS)
#include <C_LCD.h>//2x16 Character LCD driver
#define Time_out 200
int16 RS232_timeout=0;
int8 string_index=1;
int8 i=1;
char NFC_uid[20];
int1 Data_recieve_flag=0;
int1 Read_card_flag=1;
void main()
{
lcd_init();//initialize 2x16 caracter LCD
lcd_putc('\f');//Clear screen
lcd_gotoxy(1,1);
printf(lcd_putc,"RDM8800 NFC/RFID");
lcd_gotoxy(1,2);
printf(lcd_putc," READER ");
delay_ms(1000);
lcd_putc('\f');//Clear screen
while(TRUE)
{
RS232_timeout++;
if(Read_card_flag==1)//Permit read serial port
if(kbhit())
{
RS232_timeout=0;
NFC_uid[string_index]=getc();
if(string_index==12) Data_recieve_flag=1;//recieve 12 character from RDM8800
else string_index++;
}
if(Data_recieve_flag==1)//receive 12 character successfully
{
Read_card_flag=0;
Data_recieve_flag=0;
if(NFC_uid[11]==0x0D && NFC_uid[12]==0x0A)//If received stream is correct, with break line "0x0D 0x0A".
{
lcd_gotoxy(1,1);
printf(lcd_putc,"Card UID number:");
delay_ms(1000);
lcd_putc('\f');//Clear screen
//////////// display 10 digit UID number on LCD ////////////
for(i=1;i<=5;i++)
printf(lcd_putc,"%c,",NFC_uid[i]);
lcd_gotoxy(1,2);
for(i=6;i<=9;i++)
printf(lcd_putc,"%c,",NFC_uid[i]);
printf(lcd_putc,"%c",NFC_uid[10]);
/////////////////////////////////////////////////////////////
delay_ms(5000);
lcd_putc('\f');//Clear screen
}
else ///////// if stream is not correct //////////
{
lcd_putc('\f');//Clear screen
lcd_gotoxy(1,1);
printf(lcd_putc,"Data read error");
delay_ms(1000);
}
}
if(RS232_timeout>Time_out)///// detect blank time between two stream
{
RS232_timeout=Time_out;
string_index=1;
Data_recieve_flag=0;
lcd_gotoxy(1,1);
printf(lcd_putc,"Checking for Tag");
Read_card_flag=1;
}
}
}
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C_LCD.h
| Code: |
//C_LCD.h file
#define _lcd_h_
#include <math.h>
void lcd_init(void);
byte lcd_read_byte(void);
byte lcd_read_nibble(void);
void lcd_send_byte(byte address, byte n);
void lcd_send_nibble(byte n);
void lcd_gotoxy(byte x, byte y);
char lcd_getc(byte x, byte y);
void lcd_putc(char c);
//Define LCD connection Pins
#define LCD_RS_PIN PIN_D1
#define LCD_RW_PIN PIN_D2
#define LCD_ENABLE_PIN PIN_D3
#define LCD_DATA4 PIN_D4
#define LCD_DATA5 PIN_D5
#define LCD_DATA6 PIN_D6
#define LCD_DATA7 PIN_D7
#define lcd_output_enable(x) output_bit(LCD_ENABLE_PIN, x)
#define lcd_enable_tris() output_drive(LCD_ENABLE_PIN)
#define lcd_output_rs(x) output_bit(LCD_RS_PIN, x)
#define lcd_rs_tris() output_drive(LCD_RS_PIN)
#define lcd_output_rw(x) output_bit(LCD_RW_PIN, x)
#define lcd_rw_tris() output_drive(LCD_RW_PIN)
#define lcd_line_one 0x00
#define lcd_line_two 0x40
#define lcd_line_three 0x14
#define lcd_line_four 0x54
#define LCD_TYPE 0x02
byte const LCD_INIT_STRING[4] = {0x28 | (LCD_TYPE << 2), 0x0C, 0x01, 0x06};
void lcd_init(void)
{
byte i;
output_drive(LCD_DATA4);
output_drive(LCD_DATA5);
output_drive(LCD_DATA6);
output_drive(LCD_DATA7);
lcd_enable_tris();
lcd_rs_tris();
lcd_rw_tris();
lcd_output_rs(0);
lcd_output_rw(0);
lcd_output_enable(0);
delay_ms(15);
for(i=1;i<=3;i++)
{
lcd_send_nibble(0x03);
delay_ms(5);
}
lcd_send_nibble(0x02);
for(i=0;i<=3;i++)
lcd_send_byte(0,LCD_INIT_STRING[i]);
}
// ***************************************************
byte lcd_read_byte(void)
{
byte low,high;
output_float(LCD_DATA4);
output_float(LCD_DATA5);
output_float(LCD_DATA6);
output_float(LCD_DATA7);
lcd_output_rw(1);
delay_cycles(1);
lcd_output_enable(1);
delay_cycles(1);
high = lcd_read_nibble();
lcd_output_enable(0);
delay_cycles(1);
lcd_output_enable(1);
delay_cycles(1);
low = lcd_read_nibble();
lcd_output_enable(0);
output_drive(LCD_DATA4);
output_drive(LCD_DATA5);
output_drive(LCD_DATA6);
output_drive(LCD_DATA7);
return((high<<4) | low);
}
// ***************************************************
byte lcd_read_nibble(void)
{
byte n = 0x00;
n |= input(LCD_DATA4);
n |= input(LCD_DATA5) << 1;
n |= input(LCD_DATA6) << 2;
n |= input(LCD_DATA7) << 3;
return(n);
}
// ***************************************************
void lcd_send_byte(byte address, byte n)
{
lcd_output_rs(0);
while(bit_test(lcd_read_byte(),7));
lcd_output_rs(address);
delay_cycles(1);
lcd_output_rw(0);
delay_cycles(1);
lcd_output_enable(0);
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0x0F);
}
// ***************************************************
void lcd_send_nibble(byte n)
{
output_bit(LCD_DATA4, bit_test(n, 0));
output_bit(LCD_DATA5, bit_test(n, 1));
output_bit(LCD_DATA6, bit_test(n, 2));
output_bit(LCD_DATA7, bit_test(n, 3));
delay_cycles(1);
lcd_output_enable(1);
delay_us(2);
lcd_output_enable(0);
}
// ***************************************************
void lcd_gotoxy(byte x, byte y)
{
byte address;
if(y==1)
address=lcd_line_one;
else if(y==2)
address=lcd_line_two;
else if(y==3)
address=lcd_line_three;
else if(y==4)
address=lcd_line_four;
address+=x-1;
lcd_send_byte(0,0x80|address);
}
// ***************************************************
char lcd_getc(byte x, byte y)
{
char value;
lcd_gotoxy(x,y);
while(bit_test(lcd_read_byte(),7));
lcd_output_rs(1);
value = lcd_read_byte();
lcd_output_rs(0);
return(value);
}
// ***************************************************
void lcd_putc(char c)
{
switch (c)
{
case '\f':
lcd_send_byte(0,0x01);
delay_ms(2);
break;
case '\n':
lcd_gotoxy(1,0x02);
break;
case '\b':
lcd_send_byte(0,0x10);
break;
default:
lcd_send_byte(1,c);
break;
}
}
// ***************************************************
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