RC522的原理
SPI:
连线说明：
1--CS <----->PG7
2--SCK <----->PB3
3--MOSI<----->PB5
4--MISO<----->PB4
5--悬空
6--GND <----->GND
7--RST(CE) <----->PG6
8--VCC <----->VCC
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RC522 射频卡
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