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I have a problem when I communicate with mfrc522 use Uart.

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zhujiu

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Hi,all;

These days , I am learnning rc522. Today , I did a simple test. I use Uart communicate with rc522. I want to read the value of the register 0x01.But I find the rc522 always returns the same number I send to it .
2.jpg1.png

As the picture above. When I want to read the value of the register ,I should set MSB = 1;and I have set it .

I send 0x81, and the module returns 00, 81...........But I think it should returns 20h......?
3.png

How can I get 20h?!
 

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