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CC2520的GPIO2配置为TX_FRM_DONE exceptions之后,在第一次发送完成数据之后,GPIO2引脚一直持续为高电平,即使发送下一帧数据,对其也没有任何影响,一直保持高电平,无法检测到数据帧是否发送完成。怎么才能让TX_FRM_DONE exceptions在每次发送完成一帧数据之后由低电平变为高电平,检测数据是否成功发送?