User's Manual

Table Of Contents

3.3.1 ARM Serial Wire Debug (SWD)

The WGM110 Module contains a 2-wire ARM SWD interface for programming and debugging. It is recommended that the pads of this

interface are exposed in the application design to allow firmware updates and debugging.

3.3.2 Device Firmware Upgrade (DFU)

The firmware can be updated over the configured host interface (UART, SPI, or USB) using the Device Firmware Upgrade (DFU) proto-

col. This method is intended to be used for field updates of the firmware, for example, when updating the WGM110 Module firmware

from a connected host using the BGAPI serial protocol.

Note: You cannot update the bootloader using the DFU protocol. Bootloader update must be done using the SWD Debug interface.

Note: In case the DFU recovery mode is not useable for any reason, the SWD bus is always available at boot when the RESET pin of

the WGM110 Module is being pulled down.

3.3.3 RF Test Interface

There are dedicated pads on the WGM110 Module that are used to enable the Wi-Fi radio test modes. These test modes would typical-

ly be used if RF measurements relating to CE or any other certification requirements are needed. More specifically, RF Test pads are

used to enable the TX and RX test modes of the WGM110 Module.

3.3.4 Reference Schematic for SWD Debug and RF Test Interfaces

The schematic below shows the necessary connections needed for using the SWD and RF test interfaces.

Figure 3.6. SWD Debug and RF Test Interface Connections

3.4 Real Time Counter (RTC)

The Real Time Counter is a 24-bit counter providing timekeeping functions for the WGM110 Module.

WGM110 Wizard Gecko Wi-Fi

Module Data Sheet

Interfaces

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