Silicon Laboratories UG291 Manuale utente

UG291: WGM110 Wi-Fi® Expansion Kit

User's Guide

The WGM110 Wi-Fi Expansion Kit is an excellent way to explore

and evaluate the WGM110 Wi-Fi Module with an EFM32 MCU for

your embedded application.

The kit contains a Wireless Expansion Board (BRD8016A) and a WGM110 Wi-Fi Mod-

ule Radio Board (BRD4320A). The WGM110 Wi-Fi Module is an easy to use and easy

to interface Wi-Fi Network Co-Processor (NCP). Most of the associated complexity of

Wi-Fi and the protocol stack is offloaded to the module and allows for easy Wi-Fi inte-

gration into any embedded system.

The kit easily integrates and brings Wi-Fi connectivity to a compatible Silicon Labs

MCU Starter Kit through the expansion header. The Wireless Expansion Board has al-

so been designed after the Raspberry Pi Hardware Attached on Top (HAT) board speci-

fication, allowing the WGM110 Wi-Fi Expansion Kit to connect to a Raspberry Pi.

WIRELESS EXPANSION BOARD FEATURES

• EXP connector for interfacing Silicon

Labs Starter Kits

• Common feature set, including SPI,

UART, and I2C

• Allows board detection and

identification

• Radio Board connectors for inserting

Silicon Labs Wireless Radio Boards

• Mini Simplicity debug connector

• Supports programming and debugging

the module firmware

• LDO for high-power radio boards

• Raspberry Pi compatible HAT

• Unpopulated header

• HAT EEPROM for identification

WGM110 WI-FI MODULE RADIO BOARD FEATURES

• WGM110A Wizard Gecko Wi-Fi Module

• Integrated chip antenna

•802.11b/g/n compliant

• TX power: 16 dBm

• RX sensitivity: -98 dBm

• CPU core: 32-bit ARM® Cortex-M3

• Flash memory: 1 MB

• RAM: 128 kB

• Module certification: FCC, IC, Japan

and Korea

• CE compliant

silabs.com | Building a more connected world. Rev. 1.0

Table of Contents

1. Introduction ................................

1.1 Kit Contents ..............................3

1.2 Getting Started .............................3

2. Hardware Overview .............................4

2.1 Hardware Layout .............................4

3. Wi-Fi Expansion Kit .............................5

3.1 Board Setup ..............................5

3.2 Board Identification ............................6

3.3 Host Interfaces .............................6

3.3.1 UART ..............................6

3.3.2 SPI ...............................7

3.3.3 STK Pin Mapping...........................8

4. Wireless EXP Board .............................9

4.1 EXP Header ..............................9

4.1.1 Pass-through Expansion Header .....................10

4.1.2 Expansion Header Pinout ........................10

4.2 Raspberry Pi Connector ..........................11

4.2.1 Raspberry Pi Connector Pinout ......................12

4.3 Mini Simplicity Connector ..........................13

4.3.1 Mini Simplicity Connector Pinout .....................14

4.4 Power Supply ..............................15

5. Reconfiguring the Wi-Fi Module Firmware ................... 17

5.1 Building the Module Firmware ........................17

5.2 Programming the Module Firmware ......................18

6. Schematics, Assembly Drawings, and BOM ................... 20

7. Kit Revision History ............................ 21

7.1 SLEXP4320A Revision History ........................21

8. Document Revision History ......................... 22

silabs.com | Building a more connected world. Rev. 1.0 | 2

1. Introduction

The WGM110 Wi-Fi Expansion Kit (OPN: SLEXP4320A) contains a Wireless Expansion Board (BRD8016A) and a WGM110 Wi-Fi

Module Radio Board (BRD4320A) that plug directly into each other. The core of the kit is a WGM110 Wizard Gecko Wi-Fi Module which

makes this kit an excellent starting point for adding Wi-Fi connectivity to a compatible Silicon Labs MCU Starter Kit.

The kit connects and works out-of-the box by inserting it into the expansion header of one of these Silicon Labs MCU Starter Kits

(STKs):

• EFM32 Pearl Gecko PG12 Starter Kit - SLSTK3402A

• EFM32 Pearl Gecko PG1 Starter Kit - SLSTK3401A

• EFM32 Giant Gecko GG11 Starter Kit - SLSTK3701A

Note: The kit is sold without a Silicon Labs MCU STK.

The firmware and demo that is available with the kit targets applications where the MCU on the STK serves as a host that drives the

application and tells the WGM110 Wi-Fi Module what to do. The picture below shows the kit connected to a Silicon Labs MCU STK

through the Expansion Header.

Figure 1.1. WGM110 Wi-Fi Expansion Kit Connected to a Silicon Labs MCU STK

Although the main connectivity path for the kit is to a Silicon Labs MCU STK through the Expansion Header, the kit can also connect to

a Raspberry Pi and function as a Raspberry Pi HAT. To do so, a dual row, female socket, 0.1" pitch connector must be soldered in.

Note: Do not connect the kit to both a Silicon Labs MCU STK and a Raspberry Pi at the same time.

1.1 Kit Contents

The following items are included in the box:

• 1x Wireless Expansion Board (BRD8016A)

• 1x WGM110 Wi-Fi Module (BRD4320A)

1.2 Getting Started

Detailed instructions for how to get started can be found on the Silicon Labs web pages:

http://www.silabs.com/start-efm32-wifi

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Introduction

silabs.com | Building a more connected world. Rev. 1.0 | 3

2. Hardware Overview

2.1 Hardware Layout

The layout of the WGM110 Wi-Fi Expansion Kit is shown in the figure below.

EXP-header for

Starter Kits Power switch

Pass-through EXP-header

Not mounted

Mini Simplicity

connector

Raspberry Pi connector

Not mounted

Radio Board connectors

Wireless

Expansion Board

WGM110 Wi-Fi

Module Radio Board

WGM110 Wi-Fi Module

WGM110 Wi-Fi

Expansion Kit

Wireless Expansion Board

WGM110 Wi-Fi

Module Radio Board

Figure 2.1. WGM110 Wi-Fi Expansion Kit Hardware Layout

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Hardware Overview

silabs.com | Building a more connected world. Rev. 1.0 | 4

3. Wi-Fi Expansion Kit

The Wizard Gecko WGM110 is an all-inclusive Wi-Fi Module targeted for applications where good RF performance, low power con-

sumption, and easy application development, together with fast time to market, are key requirements. WGM110 has excellent RF per-

formance and can provide long range with robust wireless connectivity. The WGM110 Module integrates all of the necessary elements

required for an IoT Wi-Fi application, including an 802.11b/g/n radio, integrated chip antenna, certifications, a microcontroller, Wi-Fi and

IP stacks, an HTTP server, and multiple protocols, such as TCP and UDP.

WGM110 can act as a Wi-Fi client or be used as a Wi-Fi access point, making the provisioning of the device as easy as surfing on the

web. WGM110 can host BGScript end user applications, which means applications can be designed without relying on an external mi-

crocontroller. Alternatively, the Wi-Fi Module can run in Network Co-Processor (NCP) mode, leaving the complexity of TCP/IP network-

ing to the Module so that the customer’s own host controller can be fully dedicated to processing the customer application tasks.

The Wi-Fi expansion kit provides the ability to pair up the WGM110 Wi-Fi Module with an EFM32 host running the user application,

using the module as a network co-processor. The kit provides the Wireless EXP Board and a WGM110 Wi-Fi Module Radio Board, and

should be used together with a Silicon Labs MCU Starter Kit, such as the EFM32 Pearl Gecko PG12 STK. NCP mode of operation is

the primary focus of this kit. For standalone application development, the Wizard Gecko Wi-Fi Module Wireless Starter Kit

(SLWSTK6120A) is recommended instead.

Figure 3.1. WGM110 Wi-Fi Module as a Network Co-Processor (NCP)

The WGM110 Wi-Fi Module in the kit is pre-configured as a network co-processor, requiring no additional programming of the module

itself in order to be used with an MCU Starter Kit. Wi-Fi functionality is exposed to the host MCU on the Starter Kit through the BGAPI

interface, over a UART or SPI interface. (UART with RTS/CTS flow control is enabled by default).

All Wi-Fi and network actions are performed through this interface, and the user can focus on developing the application on the host

MCU. The module application programming interface is described in detail in the WGM110 API Reference Manual.

3.1 Board Setup

1. Insert the WGM110 Wi-Fi Module Radio Board into the radio board connectors on the Wireless EXP board.

2. Plug the Wireless EXP Board into the EXP header of the MCU Starter Kit.

3. Place the MCU power switch in the "AEM" position, and the Wireless EXP Board power switch in the "High Power (LDO)" position.

4. Insert the USB cable to power up the kit and connect it to a computer.

A detailed quick start guide is described in QSG145: WGM110 SLEXP4320 Wi-Fi Expansion Kit Quick-Start Guide.

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Wi-Fi Expansion Kit

silabs.com | Building a more connected world. Rev. 1.0 | 5

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)

RESETn EXP7

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. Rev. 1.0 | 6

3.3.2 SPI

SPI is one of two host interfaces available on the Wireless Expansion Board. In order to use SPI as the connection between the

WGM110 Wi-Fi Module and a host, the module must be reprogrammed. For more information about how to do this, see Section 3. Wi-

Fi Expansion Kit. The SPI peripheral routing is illustrated in the figure below.

EXP Header

WGM110

Wi-Fi Module

EXP4 (SPI_MOSI)

EXP6 (SPI_MISO)

EXP8 (SPI_SCLK)

EXP10 (SPI_CS)

GPIO10 (SPI_MOSI)

GPIO19 (SPI_MISO)

GPIO11 (SPI_SCLK)

GPIO8 (SPI_CE0_N)

Raspberry Pi HAT

Connector

PD0 (US1_TX)

PD1 (US1_RX)

PD2 (US1_CLK)

PD3 (US1_CS)

PA2 (Notify) EXP11

GPIO4

RESETn EXP7

16 GPIO23

Figure 3.3. SPI Peripheral Routing on the WGM110 Wi-Fi Expansion Kit

The table below shows the features of the SPI host interface.

Table 3.2. SPI Host Interface Features

Parameter Features (Value Ranges)

SPI mode SPI slave

Bit rates 9600 bps - 6 Mbps

Bit order MSB first

Clock polarity and phase Configurable

Host protocol BGAPI serial protocol

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Wi-Fi Expansion Kit

silabs.com | Building a more connected world. Rev. 1.0 | 7

3.3.3 STK Pin Mapping

The pins connected to the WGM110 Wi-Fi Module will vary based on which Starter Kit is used in the configuration. The software run-

ning on the MCU Starter Kit needs to take this into account. The table below shows the pin connections when using either the EFM32

Pearl Gecko PG1 STK or the EFM32 Pearl Gecko PG12 STK.

Table 3.3. MCU Pin Mapping

EXP Header

Module Func-

tion

EFM32 Pearl Gecko PG1 STK EFM32 Pearl Gecko PG12 STK

EXP4 SPI_MOSI PC6 (US1_TX#11) PA6 (US2_TX #1)

EXP6 SPI_MISO PC7 (US1_RX #11) PA7 (US2_RX #1)

EXP8 SPI_SCLK PC8 (US1_CLK #11) PA8 (US2_CLK #1)

EXP10 SPI_CS PC9 (US1_CS #11) PA9 (US2_CS #1)

EXP12 UART_RXD PA0 (US0_TX #0) PD10 (US0_TX #18)

EXP14 UART_TXD PA1 (US0_RX #0) PD11 (US0_RX #18)

EXP3 UART_RTS PA2 (US0_CTS #31) PC9 (US0_CTS #10)

EXP5 UART_CTS PA3 (US0_RTS #31) PD9 (US0_RTS #12)

EXP7 RESET PA4 PB6

Note that the peripheral mapping shown in the right column is just an example. The flexibility of the EFM32 devices allow a number of

different peripherals to be mapped to these pins. The important thing to note is which pin is used for the connection. The peripheral

usage is a design choice that depends on which other resources are required by the application.

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Wi-Fi Expansion Kit

silabs.com | Building a more connected world. Rev. 1.0 | 8

4. Wireless EXP Board

This chapter gives an overview of the Wireless Expansion Board connectivity and power connections.

EXP2 | VMCU

EXP4 | SPI_MOSI | PC6

EXP6 | SPI_MISO | PC7

EXP8 | SPI_SCLK | PC8

EXP10 | SPI_CS | PC9

EXP12 | UART_TX | PA0

EXP14 | UART_RX | PA1

EXP16 | I2C_SDA | PC10

EXP18 | 5V

EXP20 | 3V3

EXP1 | GND

EXP3 | UART_CTS | PA2

EXP5 | UART_RTS | PA3

EXP7 | PF3

EXP9 | PF4

EXP11 | PF5

EXP13 | PF6

EXP15 | PC11 | I2C_SCL

EXP17 | BOARD_ID_SCL

EXP19 | BOARD_ID_SDA

Expansion Header

Breakout

USB Micro-B

Connector

Mini-Simplicity

Connector

Top Side

Mini-Simplicity

Connector

VMCU

RST

VCOM_TX | PA0

SWDIO | PF1

PTI_FRAME | PB13

GND

VCOM_RX | PA1

SWO | PF2

SWCLK | PF0

PTI_DATA | PB12

VBAT

GND

Battery Connector

(on reverse side)

Hirose DF13C-2P-1.25V

Expansion

Header

Radio Board

Connectors

Raspberry Pi

Connector

(Not Mounted)

Pass-through

Expansion Header

(Not Mounted)

Mini-Simplicity

Connector

Top Side

Figure 4.1. Wireless Expansion Board Connector Layout

4.1 EXP Header

On the left hand side of the Wireless Expansion Board, an angled female 20-pin expansion header is provided to allow connection to

one of Silicon Labs’ supported Starter Kits. The expansion header on the Starter Kits follows a standard which ensures that commonly

used peripherals such as an SPI, a UART, and an I2C bus, are available on fixed locations on the connector. Additionally, the VMCU,

3V3 and 5V power rails are also available on the expansion header. For detailed information regarding the pinout to the expansion

header on a specific Starter Kit, consult the accompanying user’s guide.

The figure below shows how the WGM110 Wi-Fi Module is connected to the connector and the peripheral functions that are available.

1516

20 19

VMCU

SPI_MOSI / PD0

SPI_MISO / PD1

SPI_SCLK / PD2

SPI_CS / PD3

UART_RX / PE11

UART_TX / PE10

I2C_SDA / PE0

3V3

GND

PE13 / UART_RTS

PE12 / UART_CTS

RESETn

PE14

PA2

Not Connected (NC)

PE1 / I2C_SCL

Board ID SDA

Board ID SCL

Reserved (Board Identification)

WGM110 Wi-Fi Module I/O Pin

Figure 4.2. Expansion Header

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Wireless EXP Board

silabs.com | Building a more connected world. Rev. 1.0 | 9

4.1.1 Pass-through Expansion Header

The Wireless Expansion Board features a footprint for a secondary expansion header. The signals from the expansion header are di-

rectly tied to the corresponding pins in the footprint, allowing daisy-chaining of additional expansion boards if a connector is soldered in.

4.1.2 Expansion Header Pinout

The table below shows the pin assignments of the Expansion Header, and the port pins and peripheral functions that are available on

the WGM110 Wi-Fi Module.

Table 4.1. Expansion Header Pinout

Expansion Header WGM110 Wi-Fi Module Raspberry Pi Con. Mini Simplicity Con.

Pin Function Pin Peripheral Pin(s) Pin

2 WGM110 Wi-Fi Module voltage

domain (power switch set to Low

Power)

VMCU - 1

4 SPI_MOSI PD0 USART1_MOSI 19, 33 -

6 SPI_MISO PD1 USART1_MISO 21 -

8 SPI_SCLK PD2 USART1_CLK 23, 38 -

10 SPI_CS PD3 USART1_CS 24 -

12 UART_TX PE11 USART0_RX 8 4

14 UART_RX PE10 USART0_TX 10 5

16 I2C_SDA PE0 I2C1_SDA 3 -

18 Board 5V supply. Used to supply

LDO regulator.

5V 2, 4 -

20 Board 3V3 supply. Only used for

board identification.

3V3 1, 17 -

1 Ground GND 6, 9, 14, 20, 25, 30, 34,

3 UART_CTS PE13 USART0_RTS 11, 40 -

5 UART_RTS PE12 USART0_CTS 37, 36 -

7 Reset RESETn 16 3

9 GPIO PE14 15 -

11 GPIO PA2 7 -

13 Not Connected - -

15 I2C_SCL PE1 I2C1_SCL 5 -

17 Identification of expansion boards. BOARD_ID_SC

- -

19 Identification of expansion boards. BOARD_ID_SD

- -

UG291: WGM110 Wi-Fi® Expansion Kit User's Guide

Wireless EXP Board

silabs.com | Building a more connected world. Rev. 1.0 | 10

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