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

Number of dependers MFRC522 version Downloads/month
0 0.7.0 250
1 0.6.1 0
1 0.3.1 0
1 0.2.0 21
Depender (with downloads and own rev deps) MFRC522 version
1.2K 32 stm32f1xx-hal dev ^0.3.0
180 py32f0xx-hal dev ^0.6.1
2 stm32f1xx-hal-bxcan dev ^0.2.0