added pin mapping file and tag reset firmware

IOT901_tagReset/IOT901_tagReset.ino

@@ -0,0 +1,153 @@
+#include <NfcAdapter.h>
+#include <PN532/PN532/PN532.h>
+#include <Wire.h>
+#include <PN532/PN532_I2C/PN532_I2C.h>
+
+PN532_I2C pn532_i2c(Wire);
+NfcAdapter nfc = NfcAdapter(pn532_i2c);
+
+int ledPin = 13;
+int ledState ;
+ 
+enum states {READ_READY, READ_PAYLOAD, WRITE_PAYLOAD, WAIT_SERIAL} ; 
+int currentState = READ_READY ;
+
+char payload ;
+
+
+char read_payload(){
+  NfcTag tag = nfc.read();
+        SERIAL.println(tag.getTagType());
+        SERIAL.print("UID: "); SERIAL.println(tag.getUidString());
+
+        if (tag.hasNdefMessage()) { // every tag won't have a message
+
+            NdefMessage message = tag.getNdefMessage();
+//            SERIAL.print("\nThis NFC Tag contains an NDEF Message with ");
+//            SERIAL.print(message.getRecordCount());
+//            SERIAL.print(" NDEF Record");
+//            if (message.getRecordCount() != 1) {
+//                SERIAL.print("s");
+//            }
+//            SERIAL.println(".");
+
+            // cycle through the records, printing some info from each
+//            int recordCount = message.getRecordCount();
+//            for (int i = 0; i < recordCount; i++) {
+//                SERIAL.print("\nNDEF Record "); SERIAL.println(i + 1);
+//                NdefRecord record = message.getRecord(i);
+//                // NdefRecord record = message[i]; // alternate syntax
+//
+//                SERIAL.print("  TNF: "); SERIAL.println(record.getTnf());
+//                SERIAL.print("  Type: "); SERIAL.println(record.getType()); // will be "" for TNF_EMPTY
+//
+//                // The TNF and Type should be used to determine how your application processes the payload
+//                // There's no generic processing for the payload, it's returned as a byte[]
+//                int payloadLength = record.getPayloadLength();
+//                byte payloadtemp[payloadLength];
+//                record.getPayload(payloadtemp);
+//
+//                // Print the Hex and Printable Characters
+//                SERIAL.print("  Payload (HEX): ");
+//                PrintHexChar(payloadtemp, payloadLength);
+//
+//                // id is probably blank and will return ""
+//                String uid = record.getId();
+//                if (uid != "") {
+//                    SERIAL.print("  ID: "); SERIAL.println(uid);
+//                }
+//            }
+            NdefRecord record = message.getRecord(0);
+            int payloadLength = record.getPayloadLength();
+            byte payloadtemp[payloadLength];
+            record.getPayload(payloadtemp);
+            SERIAL.print("  Payload (HEX): ");
+            PrintHexChar(payloadtemp, payloadLength);
+            payload = (char)payloadtemp[3];
+            Serial.println("TAG IS " + String(payload) + " TYPE");
+            }
+    delay(500);
+}
+
+bool write_payload(char payload){
+  
+  Serial.println("\nPlace tag on the reader for writing or send 'q' to abort.");
+    while(!nfc.tagPresent()){
+      //abort on 'q' message
+      if (Serial.available()){if(Serial.read()=='q'){currentState = READ_READY; Serial.println("abort writing");break;}}
+    }
+    if(nfc.tagPresent()){
+      Serial.println("writing tag");
+      NdefMessage message = NdefMessage();
+      message.addTextRecord(String(payload));
+  
+      bool success = nfc.write(message);
+      if (success) {
+        Serial.println("write successfull");
+        read_payload();
+        payload = ' ';   
+        return true;
+      } else {
+        Serial.println("Write failed.");
+        return false;
+      }
+    }
+}
+
+
+void setup() {
+  delay(1000);
+  Serial.begin(115200);
+
+  pinMode (ledPin, OUTPUT);
+
+  nfc.begin();
+
+  Serial.println("TAG RESET STARTED");
+  Serial.println("enter a payload to be written to the next presented tag");
+  Serial.println("or present a tag, if 'a', 'b', or 'c' payload exists tag will be reset, else you'll be asked what payload to write");
+  Serial.println("");
+  
+}
+
+void loop() {
+  switch(currentState){
+    case READ_READY:
+      payload = ' ';
+      Serial.println("\nScan a tag or enter payload to be written");
+      while(!currentState){
+        if(nfc.tagPresent()){currentState = READ_PAYLOAD;}
+        if(Serial.available()){
+          payload = Serial.read();
+          currentState = WRITE_PAYLOAD;
+          Serial.println("Will write " + String(payload) + " to tag");
+          
+        }
+      }
+
+      break;
+
+    case READ_PAYLOAD :
+      read_payload();
+      if (payload=='a' || payload=='b' || payload=='c'){currentState = WRITE_PAYLOAD;break;}
+      else{
+        Serial.println("unknown payload, please enter payload to be written");
+        currentState = WAIT_SERIAL;
+        break;
+      }
+
+    case WRITE_PAYLOAD :
+      write_payload(payload);
+      delay(1000);
+      currentState = READ_READY;
+      break;
+
+    case WAIT_SERIAL :
+      Serial.println("please enter payload to be written, or 'q' to return to read state ");
+      while(!Serial.available()){}
+      payload = Serial.read();
+      if (payload=='q'){currentState = READ_READY;}
+      else{currentState = WRITE_PAYLOAD;}
+  }
+
+}