Device Firmware Update (DFU) Middleware Library 6.2

August 10, 2026 · View on GitHub

What's Included?

For a complete description of the DFU middleware, refer to README.md and the DFU API Reference. The full revision history of the DFU middleware is listed in the Changelog section below.

New in this release:

PMBus Transport Interface Support
PSOC™ Control C3P(M)7/8 MCUs
Initial Host Bridge Mode Support (I2C and UART)

Defect Fixes

No fixes

Known Issues

No known issues

Supported Software and Tools

This version of the DFU middleware was validated for compatibility with the following Software and Tools:

Software and Tools	Version
ModusToolbox tools package	3.8.0
GCC Compiler	14.2.1
IAR Compiler	9.70.2
ARM Compiler 6	6.22
mtb-dsl-psc3m8	1.0.0
mtb-dsl-psc3m6	0.5.0

Usage of the MCUBoot flow requires DFU Host Tool 2.0 or higher.

Changelog

Version	Changes	Reason for Change
6.2.100	Enabled emUSB transport on PSOC™ Control devices	Extending the current feature
6.2.0	Added PMBus transport templates	New transport interface support
6.2.0	Added initial Host Bridge mode support for I2C and UART	New functionality
6.1.0	Add support of PSOC Edge E84 MCUs devices	New device support
6.0.0	Migrate DFU middleware to the HAL Next flow
5.2.0	Added USB HID transport based on the emUSB-Device middleware for the CAT1A device	Extending the current feature
5.2.0	Added CANFD transport based on the PDL driver for the CAT1C device	Extending the current feature
5.2.0	Minor updates in the templates	Improved the templates usability
5.2.0	Fixed address validation for CAT1C device	Bugfix
5.1.0	Added USB CDC transport based on the emUSB-Device middleware for the CAT1A device	Extending the current feature
5.1.0	Minor updates in the templates	Improved the templates usability
5.1.0	Corrected the name of the UART object used in the cyhal_uart_set_baud() function	Now, works correctly the custom baud rate configuring in the UART transport
5.0.0	Add support of the MCUBoot flow.	New functionality.
5.0.0	Add support of the transport switching at the run time.	New functionality.
5.0.0	CAT1 device flash read/write operation and I2C/SPI/UART transport templates updated to use mtb-hal-cat1 drivers instead of mtb-pdl-cat1.	Enhance code portability.
5.0.0	Removed Cy_DFU_Complete function as not used.	Code cleanup.
5.0.0	Removed CAT1A BLE transport templates.	BLESS stack is not supported in the MTB 3.0.
4.20	Added USB CDC transport configuration for the CAT2 PDL.	Add support for the USB interface for the PMG1 device family.
4.20	Updated timeout time for the CAT1A SPI transport.	Fixed the DFU Host Tool timeout error for the CAT1A SPI transport caused by the incorrect function call (transport_spi.c file, SPI_SpiCyBtldrCommRead() function).
4.20	Minor documentation update.	Documentation improvement.
4.10	Added PSoC 4 devices support.	Extended device support.
4.10	Added MISRA-C:2012 compliance.	MISRA standard compliance.
4.10	Updated SPI communication timeout granularity.	Fixed SPI communication issue.
4.0	Updated the linker scripts to use the single pre-compiled CM0p image. The upgradeable part of the image is the CM4 application.	Support ModusToolbox v2.0 build flow.
4.0	Added the ARM compiler version 6 support (version 5 is not supported).
4.0	Added the USB interface (virtual COM port) transport template.
4.0	Removed the Secure Application Formats support.	Secure Application Formats is not supported in ModusToolbox v2.0 build flow.
4.0	Fixed the return value for the SYNC command processing.	The SYNC command returned fail after successful execution.
4.0	Updated the major and minor version defines to follow the naming convention.
3.10	Remove the function prototype from the MDK linker script include file.	Fix the linker error for the MDK compiler.
3.10	Add BLE transport templates.	Add BLE middleware support.
3.0	Bootloader SDK is renamed to the DFU (Device Firmware Update) SDK. All API prefixes and file names are renamed accordingly. Added BWC macros to simplify migration.	Avoid the confusion with the device boot-up and OS load.
3.0	Flattened the organization of the driver source code into the single source directory and the single include directory.	Driver library directory-structure simplification.
2.20	Add check of application number in Set Application Metadata command processing routine.	Prevent incorrect usage of the Set Application Metadata command.
2.20	Minor documentation updates	Documentation improvement
2.10	Moved address and golden image checks from cy_dfu.c to Cy_DFU_WriteData() in dfu_user.c, so the checks can be customized based on application needs.	Allows receiving an update for the running app use case. Improvements made based on usability feedback. Documentation update and clarification.
2.0	Use the shared RAM for application switching instead of the BACKUP register; Add support of secure application verification; Add support of I2C/SPI/BLE transport protocols; Linker scripts updated for PSoC6 Rev *A devices; Made CRC default application checksum.	To increase functionality.
1.0	Initial version.

More information

README.md