undefined first referenced
symbol in file
--------- ----------------
_InitEPwm4Gpio C:\\CCStudio_v3.3\\MyProjects\\MyFirst\\Debug\\main.obj
error: unresolved symbols remain
error: errors encountered during linking; "./Debug/MyFirst.out" not built
解决：basic_examples_BUZZER程序有问题，但是没有找出来在哪里。