It's used only as a dev dependency in 3 crates.

Number of dependers MFRC522 version Downloads/month
0 0.8.0 5
1 0.6.1 72
1 0.3.1 33
1 0.2.0 18
Depender (with downloads and own rev deps) MFRC522 version
2.6K 33 stm32f1xx-hal dev ^0.3.0
120 py32f0xx-hal dev ^0.6.1
2 stm32f1xx-hal-bxcan dev ^0.2.0