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imx6ul uart read data reponse slow

Question asked by jinghang liu on Sep 22, 2016
Latest reply on Sep 22, 2016 by jinghang liu


     I'm  useing  imx6ul runing the kernel  linux3.14.38, when I read data from the /dev/ttymxc3 the other side connect with a MCU.  When imx6ul send a data to  the MCU it will return data within 5ms .  But I have a test , If send data less than 171ms, the ttymxc3 can't read data.  So I can't read return data from MCU. In imx6ul, I use select to read data.  Where i can modify that let me read data whin 5ms?