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关于使用协议栈串口功能的问题

请问各方大牛:

     在基于协议栈想把串口0定义在P1口上(协议栈默认在P0口上)。只要把ZTOOL_P1改为ZTOOL_P2吗。我改了好像没有效果,这是为什么呢?