try to implement code for rfid

project/rfid/rfid_reader.cpp

@@ -0,0 +1,47 @@
+#include "rfid_reader.hpp"
+#include <unistd.h>
+#include <iostream>
+#include <chrono>
+#include <thread>
+#include <ctime>
+
+rfid_reader::rfid_reader()
+{
+	mfrc.PCD_Init();
+	loop();
+	std::this_thread::sleep_for(1s);
+}
+
+uint32_t rfid_reader::last_id() const
+{
+	return uid;
+}
+
+void rfid_reader::loop()
+{
+	while(true)
+	{
+		if(!mfrc.PICC_IsNewCardPresent())
+		{
+			continue;
+		}
+		if(!mfrc.PICC_ReadCardSerial())
+		{
+			continue;
+		}
+		
+
+		uid = int((unsigned char)(mfrc.uid.uidByte[0]) << 24 |
+		      (unsigned char)(mfrc.uid.uidByte[1]) << 16 |
+		      (unsigned char)(mfrc.uid.uidByte[2]) << 8  |
+		      (unsigned char)(mfrc.uid.uidByte[3]));
+
+#ifndef NDEBUG
+		printf("\n");
+		std::time_t result = std::time(nullptr);
+		std::cout << std::asctime(std::localtime(&result));
+		printf("%X\n", last_id());
+#endif
+
+	}
+}