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关于TM4C123G的中断优先级设置

IntPrioritySet(INT_UART0, 1);

这是配置中断优先级的代码,但是配置完成之后在keil的NVIC 显示,配置没有起作用,请问还需要其他的步骤吗?或者是我哪里写错了。