i.MX Processorsのトピックimx6ul uart read data reponse slow

imx6ul uart read data reponse slow

jinghangliu — Thu, 22 Sep 2016 14:12:50 GMT

Hi,

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?

Re: imx6ul uart read data reponse slow

igorpadykov — Thu, 22 Sep 2016 23:59:35 GMT

Hi jinghang

please try to build minimal configuration as describes

Table 1. Freescale Yocto project images, core-image-minimal

attached Yocto Guide.

Best regards
igor
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Re: imx6ul uart read data reponse slow

jinghangliu — Fri, 23 Sep 2016 00:36:37 GMT

I was already buided a zImage. with the same app program, PC linux could repsonse very fast, about within 1ms also could read data. But cross compile to imx6ul it need at least 170ms could read data. I use mark and space parity.