WARNING: Communication failure, is the MFRC522 properly connected? - #26 by ztz - Sensors - Arduino Forum
How to manage chip select pins when reading/writing SD cards on an SPI master/slave(multiple) configuration ?
RFID-MFRC522射频识别模块,S50卡M1_super_mariao的博客-CSDN博客
MSP430FR6989: Can't set chip select pin for SPI transmission - MSP low-power microcontroller forum - MSP low-power microcontrollers - TI E2E support forums