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TIVA C M4在ccs编译的问题

Other Parts Discussed in Thread: TM4C1230C3PM

我添加了"driverlib/pin_map.h"文件,但是却说我 error #20: identifier "GPIO_PA0_U0RX" is undefined,而且我第一次建立是没有error的,第二次就冒出来了。。求教