MX6 UART3 (ttymxc2) Rx not working

[jimmysu]

Hi Mr./Mrs

I was trying to connect the imx6q-sabresd board to a rs232 devices via uart3.

The BSP version is L3.0.35_4.1.0_130816 with Android 4.3.

Now, I can test uart3 by typing

echo "test" > /dev/ttymxc2

Its working.

But it can't receive data when I test it by using serial port console app.

Is there anyone can help on this case?

Thanks !

[jimmysu · Accepted solution]

Problem solved. Caused by HW solder empty.

HW wire connection should be:

USB TTL RXD --> R194  (imx6 UART3  TX)

USB TTL TXD --> R192   (imx6 UART3  RX)

then

disable GPS configuration in init.rc

UART3 TX/RX works.