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 NabaztagInjector::processRequest() {
if( sendEnabled && outSize > 0 ) {
Wire.write(out, outSize);
if( sendBuffer.getSize() < 1 ) { //all data is send
inited = false;
enableRFID();
}
outSize = 0;
sendEnabled = 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::begin(int _rfidPort)
{
rfidPort = _rfidPort;
if(rfidPort > 0) {
pinMode(rfidPort, OUTPUT);
digitalWrite(rfidPort, LOW);
}
sendBuffer.init(SEND_BUFFER_SIZE);
Wire.begin(CRX14_ADR);
Wire.onReceive(receiveCallback);
Wire.onRequest(requestCallback);
enableRFID();
}