如果出现“ST-Link USB communication error”ST-Link USB通信错误，则需要启动STM32 ST-LINK Utility，点击【ST-LINK】->【Firmaware】更新固件，然后打开Kei，点击魔术棒->->Debug->Settings，开到出现类似“0x2BA0 . . . ARM CoreSight SW-DP”显示，说明连接成功。
https://blog.csdn.net/weixin_49382119/article/details/132253422
https://blog.csdn.net/Born_toward/article/details/123496478
