main.c
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#include <util/delay.h>
#include <avr/io.h>
#include "PN532.h"
#include <PN532_SPI/PN532_SPI.h>
#define __SCREEN_DEBUG__
#ifdef __SCREEN_DEBUG__
#define MODEL_QUERY 'A'
#define SERIAL_ERROR 'G'
#define NFC_TAGQUERY 'C'
#define NFC_TAGQUERY_UID 'H'
#define NFC_ARDUINO 'B'
#define NFC_NOTAG 'D'
#define NFC_TYPE_PROFESSOR 'E'
#define NFC_TYPE_STUDENT 'F'
#else
#define MODEL_QUERY 0x80
#define SERIAL_ERROR 0x55
#define NFC_TAGQUERY 0x82
#define NFC_TAGQUERY_UID 0x84
#define NFC_ARDUINO 0x02
#define NFC_NOTAG 0x81
#define NFC_TYPE_PROFESSOR 0x04
#define NFC_TYPE_STUDENT 0x01
#endif
#define CPU_FREQ 16000000L
#define SERIAL_SPEED 19200
boolean tagDetected = false;
boolean tagType;
PN532_SPI pn532spi(SPI, 10);
PN532 nfc(pn532spi);
void init_serial(int speed)
{
UBRR0 = CPU_FREQ/(((unsigned long int)speed)<<4)-1;
UCSR0B = (1<<TXEN0 | 1<<RXEN0);
UCSR0C = (1<<UCSZ01 | 1<<UCSZ00);
UCSR0A &= ~(1 << U2X0);
}
void send_serial(unsigned char c)
{
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c;
}
unsigned char get_serial(void)
{
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
}
void setup(void)
{
int ser;
init_serial(SERIAL_SPEED);
nfc.begin();
uint32_t versiondata = nfc.getFirmwareVersion();
if(!versiondata)
{
send_serial(SERIAL_ERROR);
while (1);
}
nfc.SAMConfig();
do
{
ser = get_serial();
if(ser == MODEL_QUERY)
send_serial(NFC_ARDUINO);
else
send_serial(SERIAL_ERROR);
}while(ser != MODEL_QUERY);
}
uint8_t success;
uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 };
uint8_t uidLength;
uint8_t data1[16];
uint8_t data2[16];
char professorTag[7];
char studentTag[9] = {'0', '1', '2', '3', '4', '5', '6', '7'};
int ser;
void loop(void)
{
success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
if(success && !tagDetected)
{
if(uidLength == 4)
{
uint8_t keya[6] = { 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5 };
success = nfc.mifareclassic_AuthenticateBlock(uid, uidLength, 44, 0, keya);
if(success)
{
success = nfc.mifareclassic_ReadDataBlock(44, data1);
//_delay_ms(50);
if(success)
{
success = nfc.mifareclassic_ReadDataBlock(45, data2);
if(success)
{
tagDetected = true;
if(data1[4] == data1[15] &&
data1[5] == data2[0] &&
data1[6] == data2[1] &&
data1[7] == data2[2] &&
data1[8] == data2[3] &&
data1[9] == data2[4])
{
//send_serial('M');
tagType = NFC_TYPE_PROFESSOR;
professorTag[0] = data1[4];
professorTag[1] = data1[5];
professorTag[2] = data1[6];
professorTag[3] = data1[7];
professorTag[4] = data1[8];
professorTag[5] = data1[9];
}
else
{
//send_serial('N');
tagType = NFC_TYPE_STUDENT;
studentTag[0] = data1[15];
studentTag[1] = data2[0];
studentTag[2] = data2[1];
studentTag[3] = data2[2];
studentTag[4] = data2[3];
studentTag[5] = data2[4];
studentTag[6] = data2[5];
studentTag[7] = data2[6];
}
}
//else
//send_serial('L');
}
//else
//send_serial('K');
}
//else
//send_serial('J');
}
//else
//send_serial('I');
}
else if(tagDetected)
{
ser = get_serial();
if(ser == NFC_TAGQUERY)
send_serial(tagType);
else if(ser == NFC_TAGQUERY_UID)
{
if(tagType == NFC_TYPE_STUDENT)
{
send_serial(studentTag[0]);
_delay_ms(50);
send_serial(studentTag[1]);
_delay_ms(50);
send_serial(studentTag[2]);
_delay_ms(50);
send_serial(studentTag[3]);
_delay_ms(50);
send_serial(studentTag[4]);
_delay_ms(50);
send_serial(studentTag[5]);
_delay_ms(50);
send_serial(studentTag[6]);
_delay_ms(50);
send_serial(studentTag[7]);
_delay_ms(50);
}
else
{
send_serial(professorTag[0]);
send_serial(professorTag[1]);
send_serial(professorTag[2]);
send_serial(professorTag[3]);
send_serial(professorTag[4]);
send_serial(professorTag[5]);
}
tagDetected = false;
_delay_ms(5000);
}
else
send_serial(SERIAL_ERROR);
}
else
{
if(get_serial() == NFC_TAGQUERY)
send_serial(NFC_NOTAG);
else
send_serial(SERIAL_ERROR);
}
}
int main(void)
{
setup();
while(1)
loop();
return 0;
}