在想把B端口配成推挽（使用库函数）的时候，出现L6218E:Undefined symbol GPIO_Init(refferd from test....
usart.c里面没有定义GPIO_Init函数，你包含这个函数的h文件试试
dfa.axf: Error: L6218E: Undefined symbol GPIO_Init (referred from wuyuetian.o).dfa.axf: Error:...
When building with a custom config, the kernel build-process fails with: LD vmlinux.o MODPOST vmlinux.o GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o LD init/built-in.o LD .tmp_vmlinux1 ar...