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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

BGM220P. This eliminates the need for an external serial port adapter.

VCOM_ENABLE

PA05 (US1_TX)

PA06 (US1_RX)

PB04 (GPIO)

VCOM_RX

VCOM_TX

Board

Controller

BGM220P

USB

Host

Isolation & Level Shift

PA08 (US1_CTS)

PA07 (US1_RTS)

VCOM_CTS

VCOM_RTS

ETH

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 BGM220P to the board controller

VCOM_RX Receive data from the board controller to the BGM220P

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 BGM220P 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 admin console. The default settings

depend on which radio board is used with the Wireless STK Mainboard.

Note: The VCOM port is only available when the board controller is powered, which requires the J-Link USB cable to be inserted.

UG432: BGM220P Wireless Gecko Module Starter Kit User's Guide

Peripherals

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