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3.6 USB Serial Console
The evaluation board contains an on-board Silicon Labs CP2102N USB-serial converter. Connect the included
Micro-USB cable to the Micro-USB jack labeled USB-UART Bridge:
The serial converter does not require additional drivers on Windows and Linux.
For Mac OS, drivers are available from Silicon Labs: http://www.silabs.com/products/development-tools/
software/usb-to-uart-bridge-vcp-drivers
The Q7 modules has two external UARTs:
• UART0 is, by default, used for the serial console for interactive login.
• UART1 is unused by default and can be freely used for machine-to-machine communications or other
purposes.
The switch UART0 / UART1 cross-switches UART0 and UART1 between the RS232 / RS485 jack and the onboard
USB-serial converter:
Switch Position
UART0
UART1
For interactive login through the USB-serial converter, make sure the switch is on the UART1 position
Picocom can be used to connect via the serial line (assuming the USB-serial converter is USB0):
picocom -b
115200
/dev/ttyUSB0
Note: Make sure to disable software flow-control (XON/XOFF). Otherwise serial input may not be recognized.
After system bootup, the login console appears on the terminal:
rk3399-q7 login:
You can log in as root with password root or as user user with password user.
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Fig. 3.4: USB UART
RS232 / RS485 jack connected to:
UART0 (interactive console)
UART1
USB-serial converter connected to:
UART1
UART0 (interactive console)
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