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用CCS按照例程建立工程编译报错

我想用CCS按照官方给的例程建立一个工程,代码都是从例程复制的,头文件路径和添加的C文件都和例程一样,但是编译老是报错(error #10234-D: unresolved symbols remain),细看错误是找不到串口相关的函数定义,我就搞不懂我的工程和官方的看界面都差不多呀,怎么官方的就能找到函数定义呢?