embassy/examples/boot/bootloader/stm32wb-dfu

Bootloader for STM32

This bootloader implementation uses embassy-boot and embassy-usb-dfu to manage firmware updates and interact with the flash memory on STM32WB55 devices.

Prerequisites

• Rust toolchain with cargo installed
• cargo-flash for flashing the bootloader
• dfu-util for firmware updates
• cargo-binutils for binary generation

Usage

1. Flash the Bootloader

First, flash the bootloader to your device:

cargo flash --features embassy-stm32/stm32wb55rg --release --chip STM32WB55RGVx

2. Build and Flash Application

Generate your application binary and flash it using DFU:

cargo objcopy --release -- -O binary fw.bin
dfu-util -d c0de:cafe -w -D fw.bin

Troubleshooting

• Make sure your device is in DFU mode before flashing
• Verify the USB VID:PID matches your device (c0de:cafe)
• Check USB connections if the device is not detected
• Make sure the transfer size option of dfu-util matches the bootloader configuration. By default, dfu-util will use the transfer size reported by the device, but you can override it with the -t option if needed.
• Make sure control_buf size is larger than or equal to the usb_dfu BLOCK_SIZE parameter (in this example, both are set to 4096 bytes).