......axf: Error: L6218E: Undefined symbol SystemCoreClock (referred from system_gd32f4xx.o).
解决方法:在system_gd32f4xx.c文件头函数后面定义:
uint32_t SystemCoreClock = 0; //自动更新
......axf: Error: L6218E: Undefined symbol SystemCoreClock (referred from system_gd32f4xx.o).
解决方法:在system_gd32f4xx.c文件头函数后面定义:
uint32_t SystemCoreClock = 0; //自动更新

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