Switch Between DFU and User Application in Software (NO Physical Interaction)?

[dplogiic]

Hello team,

I’m working with an STM32H745iik6/ Nucleo-H745ziq microcontroller and currently using USB DFU mode to upload firmware. The process involves setting BOOT0 to 1 and performing a manual reset to enter DFU mode. After uploading the new firmware, I manually set BOOT0 back to 0 and reset the board again to run the user application.

otherwise any ST software like stm32cubepgm to select DFU mode or user_apllication mode?

Current Approach:

1. Enter DFU Mode:
   • Set BOOT0 to 1.
   • Perform a manual reset.
2. Upload Firmware via USB DFU.
3. Run User Application:
   • Set BOOT0 to 0.
   • Perform another manual reset.

Goal:

I want to automate this process entirely through software without the need for physical interaction. Specifically, I’m looking for a way to:

1. Switch to DFU mode using software.
2. Upload new firmware.
3. Automatically return to the user application after the firmware upload.

• Is it possible to switch between DFU mode and the user application purely through software on STM32 microcontrollers?
• If so, can someone provide an example or detailed steps on how to achieve this?
• What are the best practices to ensure a smooth transition between DFU mode and the user application without manual intervention?

[TDK]

Jumping to the bootloader from the application can be done, see this page for reference.

How to jump to system bootloader from application ... - STMicroelectronics Community

To get back to the application, you can use the GO instruction, or reset the chip (remotely) using STM32CubeProgrammer.