Update ECCX08.cpp with counter functions

Author: maihde

src/ECCX08.cpp

@@ -548,6 +548,54 @@ int ECCX08Class::nonce(const byte data[])
   return challenge(data);
 }
 
+long ECCX08Class::incrementCounter(int keyId)
+{
+  uint32_t counter;  // the counter can go up to 2,097,151
+
+  if (!wakeup()) {
+    return -1;
+  }
+
+  if (!sendCommand(0x24, 1, keyId)) {
+    return -1;
+  }
+
+  delay(20);
+
+  if (!receiveResponse(&counter, sizeof(counter))) {
+    return -1;
+  }
+
+  delay(1);
+  idle();
+
+  return counter;
+}
+
+long ECCX08Class::readCounter(int keyId)
+{
+  uint32_t counter;  // the counter can go up to 2,097,151
+
+  if (!wakeup()) {
+    return -1;
+  }
+
+  if (!sendCommand(0x24, 0, keyId)) {
+    return -1;
+  }
+
+  delay(20);
+
+  if (!receiveResponse(&counter, sizeof(counter))) {
+    return -1;
+  }
+
+  delay(1);
+  idle();
+
+  return counter;
+}
+
 int ECCX08Class::wakeup()
 {
   _wire->setClock(_wakeupFrequency);
@@ -892,4 +940,4 @@ uint16_t ECCX08Class::crc16(const byte data[], size_t length)
 ECCX08Class ECCX08(CRYPTO_WIRE, 0x60);
 #else
 ECCX08Class ECCX08(Wire, 0x60);
-#endif
+#endif