Thanks for your reply.I use the routine generated by STM32CubeMX, and the package X-CUBE-SAFEA1 is version 1.2.2. I can share my.ioc file with you. I use IIC2 and USART2 for serial portI don't have  configurations when I create a project

I use X-CUBE SAEFA1 to run the Authentication routine in STSAFE-A110 on stm32l151, the serial port returns 6 or is stuck, ask for help