Board Identification; Host Interfaces; Uart - Silicon Laboratories UG291 User Manual

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
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.
WGM110
Wi-Fi Module
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.
Parameter
UART baud rate
Flow control
Data bits
Parity
Stop bits
Host protocol
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PE10 (US0_TX)
PE11 (US0_RX)
PE12 (US0_CTS)
PE13 (US0_RTS)
RESETn
Table 3.1. UART Host Interface Features and Default Values
Features / Supported
9600 bps - 6 Mbps
none, odd, even
BGAPI serial protocol
UG291: WGM110 Wi-Fi® Expansion Kit User's Guide
14
EXP14 (UART_RX)
12
EXP12 (UART_TX)
5
EXP5
3
EXP3
7
EXP7
10
GPIO15 (UART_RXD0)
8
GPIO14 (UART_TXD0)
36
GPIO16
11
GPIO17
16
GPIO23
Ranges
RTS/CTS
8 or 9
1 or 2
Wi-Fi Expansion Kit
5. Reconfiguring the
EXP Header
Raspberry Pi HAT
Connector
Default Value
115200 Kbps
Enabled
8
None
1
BGAPI serial protocol
Rev. 1.0 | 6