boolean RFID_EM41000::readRFID(String& rfid_result, unsigned long timeout_ms) {
unsigned long start_time = millis();
int bytes_read = -1;
char tag_byte = '\0';
char tag_data[RFID_LENGTH+1];
tag_data[RFID_LENGTH] = '\0';
// Flush serial buffer before turning on RFID transponder
readUntilUnavailable(_rfid_serial);
// Enable the RFID reader
enableRFID();
while(bytes_read <= RFID_LENGTH
&& (timeout_ms == 0 || millis() - start_time < timeout_ms))
{
// Read the byte from the RFID reader
tag_byte = _rfid_serial.read();
// Are we currently populating tag_data?
if (bytes_read >= 0) {
// Should we stop populating tag_data?
if(bytes_read >= RFID_LENGTH || tag_byte == RFID_START || tag_byte == RFID_END) {
disableRFID();
break; // stop reading
}
// Append the tag_data (weird bytes appear in >=Arduino 1.0, so we check byte content)
if ((tag_byte >= 'A' && tag_byte <= 'F') || (tag_byte >= '0' && tag_byte <= '9')) {
tag_data[bytes_read] = tag_byte;
bytes_read++;
}
}
else if(tag_byte == RFID_START) {
// We read the first byte of a key... signals that we start reading into tagData[]
bytes_read = 0;
}
}
// Disable RFID (just to be safe)
disableRFID();
// Return result
if (bytes_read == RFID_LENGTH) {
rfid_result = tag_data;
return true;
}
else {
return false;
}
}
void loop() { //Start our main Arduino Loop
enableRFID(); //Enable the RFID card
getRFIDTag(); //Reads the tag
if(isCodeValid()) { //Validates that the tag is good
disableRFID(); //Puts the RFID reader in to low power mode
sendCode(); //Sends the code read to the serial port
delay(ITERATION_LENGTH); //Debounce?
}
else {
disableRFID(); //Got a incomplete code..
Serial.println("Got some noise");
}
Serial.flush();
clearCode();
}
void NabaztagInjector::inject(uint8_t* data, uint8_t length)
{
for(int i = 0; i < length; i++) {
sendBuffer.put(data[i]);
}
disableRFID(); //aka start injection :-)
}
RFID_EM41000::RFID_EM41000(Stream& rfid_serial, int enable_pin)
: _enable_pin(enable_pin), _rfid_serial(rfid_serial)
{
// Assume rfid_serial.begin() is called elsewhere for now
//rfid_serial.begin(RFID_BAUD_RATE);
// Set enable-pin pin-mode
pinMode(enable_pin, OUTPUT);
disableRFID();
}
