The purpose of the DFU middleware library is to provide an SDK for updating firmware images. The middleware allows creating these types of projects:

• An application loader receives the program and switch to the new application.
• A loadable application to be transferred and programmed.

A project can contain the features of both types.

• Reads firmware images from a host through a number of transport interfaces, e.g. USB, UART, I2C, SPI Supports dynamic switching (during runtime) of the communication interfaces
• Provides ready-for-use transport interface templates based on HAL drivers for PDL drivers for CAT1 devices and CAT2 devices
• Supported flows: Basic bootloader and MCUBoot compatibility
• Device support: CAT1A, CAT2 (Basic bootloader flow), CAT1C (MCUBoot compatibility flow)
• Programs a firmware image to the specified address in internal flash, XIP region or any external memory that supports the DFU API
• Copies applications
• Validates applications
• Updates safely - updates at a temporary location, validates, and if valid, overwrites the working image
• Switches applications - passes parameters in RAM when switching applications
• Supports encrypted image files - transfers encrypted images without decrypting in the middle
• Supports many application images - the number of applications is limited by the metadata size; each image can be an application loader, for example, 512-byte metadata supports up to 63 applications
• Supports customization
• Supports the CRC-32 checksum to validate data.

The DFU middleware requires configuration files which should be enabled by components in the Makefile. The application loader requires DFU_USER component, transport components (e.g. for loading with UART - DFU_UART). The loadable application does not require specific component and dfu_user.h file includes with DFU middleware. The configuration files is copies in the application and could be updated based on the specific use cases. For a build with a the basic bootloader flow, use the dfu linker scripts located in the linker_script directory.

The Quick Start section of the DFU Middleware API Reference Guide describes step-by-step instructions to set up a DFU application.

For more information, refer to the following links:

• DFU Middleware Library Release Notes
• DFU Middleware Library API Reference
• AN213924 DFU SDK User Guide
• CE213903 DFU SDK Basic Communication Code Examples
• CAT1 Peripheral Driver Library API Reference
• CAT2 Peripheral Driver Library API Reference
• USB Device Middleware Library API Reference
• Code Examples for ModusToolbox Software
• ModusToolbox Device Configurator Tool Guide
• ModusToolbox Device Firmware Update Host Tool
• ModusToolbox USB Configurator Tool Guide
• PSoC 6 BLE Pioneer Kit
• PSoC 6 WiFi-BT Pioneer Kit
• PSoC 6 Wi-Fi BT Prototyping Kit
• XMC7200 evaluation kit
• PSoC 6 MCU Datasheets
• PSoC 6 MCU Technical Reference Manuals
• PSoC 4 product page
• Infineon Technologies AG

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