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TM4C129XNCZAD 的串口为什么只有uart0 uart1 uart2 可以使用,其他的的不能使用

Other Parts Discussed in Thread: TM4C129XNCZAD

根据例子程序修改的程序,但只有uart0 uart1 uart2可以使用,其他的串口执行到uartprintf 就不往下执行了