uart3 Receiving data is unstable.

[zhanghan]

imx6 上uart3转rs485，连续多次使用ctrl+c结束程序，然后重新启动应用程序（程序主要是while循环里，使用read读取数据，收到数据后，使用write发送接收到的数据）。多次测试会有收不到485数据的情况。
具体为：接收数据长度107byte 300ms一包数据，数据为不间断发送.

[zhanghan]

First I use ctrl+c  end the program on secure CRT,then I Restart the application （the program is just a while loop，in the loop， i read the data from the 485 interface using uart3 of imx6，after i get the data，then i send the received data）， i find debug serial can not receive data during this test。why？but i find there is data on the uart3 rx pin on the hardware by oscilloscope。