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MFRC522 i2c for Arduino and ESP8266

Results 2 MFRC522_I2C_Library issues
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Hello, In Arduino IDE and Platformio IDE i get the following Error when i just want try the demo: MFRC522_i2c:9:1: error: 'MFRC522' does not name a type Thanks

Compiling a sketch and using MFRC522_I2C_library the Arduino IDE reports this message (non blocking but present). Can you fix it? thanks. p. c:\Users\...\libraries\MFRC522_I2C_Library-master\src\MFRC522_I2C.cpp: In member function 'byte MFRC522::PCD_ReadRegister(byte)': c:\Users\...Arduino\libraries\MFRC522_I2C_Library-master\src\MFRC522_I2C.cpp:83:51: warning:...