3.2 Board Identification
The Starter Kit and Wireless EXP board provide identification of all the connected boards. This detection and identification is used by
the Simplicity Studio tool to present the correct documentation and software examples.
The kit is able to detect which radio board is inserted, but requires the board to be inserted at power-on. It is therefore important to
always connect the boards together before inserting the USB cable into the starter kit (powering on the boards).
3.3 Host Interfaces
There are two available host interfaces on the WGM110 Wi-Fi Expansion Kit, one of which can be used to connect the WGM110 Wi-Fi
Module to an external host. The production firmware on the WGM110 Wi-Fi Module uses UART with RTS/CTS flow control as the de-
fault host interface. For information on how to reprogram the firmware on the WGM110 Wi-Fi Module, see Section
5. Reconfiguring the
Wi-Fi Module Firmware
.
3.3.1 UART
UART with RTS/CTS flow control is enabled by default on the production firmware of the WGM110 Wi-Fi Module. The UART peripheral
routing is illustrated in the figure below.
EXP Header
WGM110
Wi-Fi Module
EXP14 (UART_RX)
EXP12 (UART_TX)
EXP5
EXP3
Raspberry Pi HAT
Connector
GPIO15 (UART_RXD0)
GPIO14 (UART_TXD0)
GPIO16
GPIO17
GPIO23
PE10 (US0_TX)
PE11 (US0_RX)
PE12 (US0_CTS)
PE13 (US0_RTS)
14
12
5
3
10
8
36
11
RESETn
EXP7
7
16
Figure 3.2. UART Peripheral Routing on the WGM110 Wi-Fi Expansion Kit
The table below shows the features of the UART host interface. The WGM110 Wi-Fi Module comes programmed with the settings listed
under default value.
Table 3.1. UART Host Interface Features and Default Values
Parameter
Features / Supported
Ranges
Default Value
UART baud rate
9600 bps - 6 Mbps
115200 Kbps
Flow control
RTS/CTS
Enabled
Data bits
8 or 9
8
Parity
none, odd, even
None
Stop bits
1 or 2
1
Host protocol
BGAPI serial protocol
BGAPI serial protocol
UG291: WGM110 Wi-Fi® Expansion Kit User's Guide
Wi-Fi Expansion Kit
silabs.com
| Building a more connected world.
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