nfc.c
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#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <strings.h>
#include <inttypes.h>
#include "ui.h"
#include "nfc.h"
#include "printx.h"
#include "serial.h"
#define DEVICE1 "/dev/ttyACM0"
#define SPEED B19200
#define NFC_POLLING_TIME 500000
#define NFC_TAG_LENGTH 9
#define GET_DEVICE_MODEL 'A'
#define DEVICE_MODEL_NFC 'B'
#define GET_NFC_STATUS 'C'
#define NO_TAG_DETECTED 'D'
#define PROFESSOR_TAG 'E'
#define STUDENT_TAG 'F'
#define GET_TAG_DETAILS 'H'
// Globals
int nfc_fd = -1;
bool nfcStop = false;
struct termios saveterm;
bool initNFC()
{
unsigned char data;
printx(DEBUG, NFC, "Connecting to interface 1\n");
if(init_serial(DEVICE1, SPEED, &nfc_fd, &saveterm))
{
printx(DEBUG, NFC, "Connected to an interface\n");
sendData(&nfc_fd, GET_DEVICE_MODEL);
printx(DEBUG, NFC, "Sended identification request %02x\n", GET_DEVICE_MODEL);
data = getData(&nfc_fd);
if(data == DEVICE_MODEL_NFC)
printx(INFO, NFC, "NFC Arduino connected\n");
else
printx(DEBUG, NFC, "NFC Arduino not found, response was %02x\n", data);
}
else
{
printx(WARNING, NFC, "Unable to connect to such interface\n");
return false;
}
return true;
}
void stopNFC()
{
close_serial(&nfc_fd, &saveterm);
nfcStop = true;
}
bool isTagPresent(char* tag)
{
unsigned char data;
sendData(&nfc_fd, GET_NFC_STATUS);
data = getData(&nfc_fd);
if(data == PROFESSOR_TAG)
{
sendData(&nfc_fd, GET_TAG_DETAILS);
printx(INFO, NFC, "Professor Tag Detected %02x\n", data);
//return (read(serial_fd, tag, 6) == 6);
}
else if(data == STUDENT_TAG)
{
sendData(&nfc_fd, GET_TAG_DETAILS);
printx(INFO, NFC, "Student Tag Detected\n");
tag[0] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[0]);
tag[1] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[1]);
tag[2] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[2]);
tag[3] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[3]);
tag[4] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[4]);
tag[5] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[5]);
tag[6] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[6]);
tag[7] = getData(&nfc_fd);
printx(DEBUG, NFC, "Last read %02x\n", tag[7]);
return true;
}
else if(data == NO_TAG_DETECTED)
{
printx(DEBUG, NFC, "No Tag Detected\n");
return false;
}
else
{
printx(DEBUG, NFC, "Read data did not matched with expected data %02x\n", data);
return false;
}
return false;
}
void* processNFC(void* we)
{
char myTag[NFC_TAG_LENGTH];
char buffer[NFC_TAG_LENGTH];
while(!nfcStop)
{
printx(DEBUG, NFC, "Scanning for tags\n");
if(isTagPresent(buffer))
{
sprintf(myTag, "%s", buffer);
printx(DEBUG, NFC, "Want to send %s as new tag\n", myTag);
setTagName(myTag);
}
usleep(NFC_POLLING_TIME);
}
return NULL;
}