keil常见错误 main.c(35):warning:#128-D:loopisnotreachablefromprecedingcode main.c(54):warning:#1-D:lastlineoffileendswithoutanewline initSpi.c(6):error:#268:declarationmaynotappearafterexecutablestatementinblock main.c(31):warning:#223-D:function"initNvic"declaredimpl