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如何把TM4C123 launchpad的pa0pa1的默认uart功能改成GPIO功能?

如何把TM4C123 launchpad的pa0pa1的默认uart功能改成GPIO功能?

新手,由于要使用pa口,发现pa0和pa1默认是Uart功能,直接用API的GPIOtypeOutput改不了。也找不到GPIOPctl怎么改,也不知道是不是要Unlock,怎么UNlock。请问应该如何改成GPIO功能呢?