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关于6455使用Mailbox_pend和Mailbox_post问题

Mailbox_pend和Mailbox_post传输数据的时候,当突然断开网络连接后,会出现跑飞现象,

经查找,是Mailbox_pend   到  Mailbox_post时间太长,不知道在运行什么,以前调试好的是可以传输的,突然今天不行了