Usb Serial Console - Cherry RINGNECK SOM-PX30-uQ7 User Manual

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 macOS, drivers are available from Silicon Labs: https://www.silabs.com/products/development-tools/
software/usb-to-uart-bridge-vcp-drivers
The RINGNECK SOM-PX30-uQ7 module 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.
Note: UART1 is the name of the UART exposed on the Haikou baseboard. It is actually connected to the UART5
controller on the PX30 SoC.
Incidentially, UART0 on Haikou is connected to the UART0 controller on the PX30 SoC.
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 boot-up, the login console appears on the terminal:
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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)