try to implement rfid

project/rfid/rfid.cpp

@@ -0,0 +1,45 @@
+#include <unistd.h>
+#include <iostream>
+#include <ctime>
+#include <cstdint>
+
+#include "MFRC522.h"
+
+MFRC522 mfrc;
+
+uint32_t getUID()
+{
+	uint32_t 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]));
+	return uid;
+}
+
+int main()
+{
+	mfrc.PCD_Init();
+
+	while(true)
+	{
+		if(!mfrc.PICC_IsNewCardPresent())
+		{
+			continue;
+		}
+		if(!mfrc.PICC_ReadCardSerial())
+		{
+			continue;
+		}
+		printf("\n");
+		std::time_t result = std::time(nullptr);
+		std::cout << std::asctime(std::localtime(&result));
+
+		printf("%X\n", getUID());
+
+	}
+
+	printf("\n");
+    	usleep(1000*1000);
+    return 0;
+}
+