12.Warning (15714): Some pins have incomplete I/O assignments. Refer to the I/O Assignment Warnings report for details

解释：对于一些管脚，缺少了部分描述，需要再添加一些设置，比如current strength,slew rate等；

措施：打开pin plannel界面，在current strength和slew rate中选择参数，将默认值改成非默认值；