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我想实现用键盘来改变DA输出电压的大小。
但将例程修改调用后，发现时钟重复定义了，连看门狗都重复定义了。这个是qq1019753552，求指教啊
#ifndef __HEAD_H // 如果没有定义 HEAD_H
#define __HEAD_H // 先定义 HEAD_H，
