5.5 Virtual COM Port
An asynchronous serial connection to the board controller is provided for application data transfer between a host PC and the target
EFR32. This eliminates the need for an external serial port adapter.
VCOM_ENABLE
PA08 (US0_TX)
PA09 (US0_RX)
PB00 (GPIO)
VCOM_RX
VCOM_TX
Board
Controller
EFR32
USB
Host
PC
Isolation & Level Shift
PB05 (US0_CTS)
PA00 (US0_RTS)
VCOM_CTS
VCOM_RTS
ETH
or
Figure 5.5. Virtual COM Port Interface
The virtual COM port consists of a physical UART between the target device and the board controller and a logical function in the board
controller that makes the serial port available to the host PC over USB or Ethernet. The UART interface consists of four pins and an
enable signal.
Table 5.1. Virtual COM Port Interface Pins
Signal
Description
VCOM_TX
Transmit data from the EFR32 to the board controller
VCOM_RX
Receive data from the board controller to the EFR32
VCOM_CTS
Clear to Send hardware flow control input, asserted by the board controller when it is ready to receive more data
VCOM_RTS
Request to Send hardware flow control output, asserted by the EFR32 when it is ready to receive more data
VCOM_ENABLE Enables the VCOM interface, allowing data to pass through to the board controller
The parameters of the serial port, such as baud rate or flow control, can be configured using the
. The default settings
depend on which radio board is used with the mainboard.
Note:
The VCOM port is only available when the board controller is powered, which requires the J-Link USB cable to be inserted.
Note:
There may be slight differences on the terminal prompt and settings between the Wireless Starter Kit Mainboard and the Wire-
less Pro Kit Mainboard.
UG525: EFR32xG24 2.4 GHz 10 dBm Wireless Pro Kit User's Guide
Peripherals
silabs.com
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