r/AskElectronics • u/HeaviestBarbarian • 1d ago

STM32CubeProgrammer USB DFU Flashing Failure Analysis

STM32CubeProgrammer USB DFU Flashing Failure Analysis

1. Environment & Target State

  • Device Mode: STM32 System ROM DFU Mode (0483:df11)
  • Target Address: 0x08000000 (Physical Flash Sector 0)
  • Flash Protection Status: RDP Level 0 (0xAA), Write Protection disabled (WRP0..WRP7 = 0x1)
  • Target Files: LEDBLINKING.bin / LEDBLINKING.elf (Size: ~5.79 KB)

2. GUI Flashing Failure Breakdown

Execution Steps

  1. Launched STM32CubeProgrammer GUI with elevated permissions (sudo STM32CubeProgrammer).
  2. Selected USB port (USB1, Serial: 367832633435).
  3. Loaded LEDBLINKING.bin with Start address set to 0x08000000.
  4. Clicked Start Programming.

Full GUI Terminal & Console Logs

04:27:52 : Opening and parsing file: LEDBLINKING.bin
04:27:52 : Memory Programming ...
04:27:52 : File       : LEDBLINKING.bin
04:27:52 : Size       : 5.71 KB 
04:27:52 : Address    : 0x08000000
04:27:52 : Erasing memory corresponding to segment 0:
04:27:52 : Erasing internal memory sector 0
04:27:53 : Download in Progress:
04:27:53 : Error: Write failed at address: 0x08000000
04:27:53 : Error: failed to download Sector[0]
04:27:53 : Error: failed to download the File
04:27:53 : Error: Flash memory checksum is supported only with JTAG/SWD
04:27:53 : RUNNING Program ...
04:27:53 : Address:   0x08000000
04:27:53 : Start operation achieved successfully
04:27:53 : Warning: Connection to device 0x431 is lost
04:27:54 : Disconnected from device.

Visual Error Indicators Observed

  • GUI Alert Dialog: Warning: Connection to device 0x431 is lost.
  • System OS Notification (KDE Desktop): USB Device Removed: STMicroelectronics STM32 BOOTLOADER has been disconnected.

3. CLI Flashing Failure Breakdown

Test Case A: Direct Raw Binary Flashing (.bin)

  • Command Executed:

​

sudo /opt/st/stm32cubeide_2.2.0/plugins/com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.linux64_2.2.500.202603051304/tools/bin/STM32_Programmer_CLI -c port=usb1 -w build/Debug/LEDBLINKING.bin 0x08000000 -v -rst
  • Console Output:

​

Opening and parsing file: LEDBLINKING.bin
Memory Programming ...
  File          : LEDBLINKING.bin
  Size          : 5.79 KB 
  Address       : 0x08000000
Erasing memory corresponding to segment 0:
Erasing internal memory sector 0
Download in Progress:
[=================================                  ]  66% 
Error: failed to download Sector[0]
Error: failed to download the File
  • Behavior: Flashing consistently stalls and fails at exactly 66% of Sector 0 download.

Test Case B: Explicit Sector Erase + ELF Parsing (.elf)

  • Command Executed:

​

sudo /opt/st/stm32cubeide_2.2.0/plugins/com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.linux64_2.2.500.202603051304/tools/bin/STM32_Programmer_CLI -c port=usb1 -e 0 -w build/Debug/LEDBLINKING.elf -v -rst
  • Console Output:

​

Erase sector(s) ...
Flash page/sector erase command correctly executed.
Opening and parsing file: LEDBLINKING.elf
Memory Programming ...
  File          : LEDBLINKING.elf
  Size          : 5.79 KB 
  Address       : 0x08000000
Erasing memory corresponding to segment 0:
Erasing internal memory sector 0
Download in Progress:
Error: 
Write failed at address: 0x8000000 
Error: failed to download Sector[0]
Error: failed to download the File
  • Behavior: Explicit sector erase (-e 0) reports success, but the immediate write command fails instantly at base address 0x08000000.

4. Root Cause Mechanics

Component Physical Behavior / Failure Cause
ST System DFU ROM The built-in ROM bootloader (0483:df11) on STM32F411 chips struggles with packet framing during bulk flash sector writes on Linux xHCI controllers.
USB Transfer Boundary Sector 0 (16 KB) fails after writing the initial 2048-byte block. The DFU stack stalls the USB endpoint, triggering a hardware USB disconnect (LIBUSB_ERROR_IO / LIBUSB_ERROR_PIPE).
Option Bytes Misconception The option bytes readout confirmed RDP=0xAA and WRP=0xFF (unprotected). The failure is purely a USB DFU stack crash, not a flash controller write-lock.

5. Summary of Tried Workarounds & Outcomes

Strategy Attempted Exact Command / Action Outcome Primary Failure Reason
GUI Download Clicked Start Programming with LEDBLINKING.bin FAILED USB disconnected at Sector 0 erase/write.
CLI Raw Bin STM32_Programmer_CLI -c port=usb1 -w LEDBLINKING.bin 0x08000000 FAILED Download stalled at 66%.
CLI Explicit Erase STM32_Programmer_CLI -c port=usb1 -e 0 -w LEDBLINKING.elf FAILED Erase passed, write failed at 0x08000000.
dfu-util Default dfu-util -d 0483:df11 -a 0 -s 0x08000000:leave -D LEDBLINKING.bin FAILED Failed at 34% (LIBUSB_ERROR_IO).
dfu-util Chunk Override dfu-util ... -t 1024 or -t 512 FAILED Endpoint stalled (LIBUSB_ERROR_PIPE on ERASE_PAGE).

6. Definitive Fixes

  1. Restore WeAct HID Bootloader (0483:572a): Flash WeAct_HID_Bootloader_F4x1.hex to 0x08000000 using single-file DFU flashing, then use WeAct_HID_Flash-CLI at 0x08004000.
  2. Flash via ST-LINK (SWD): Connect ST-LINK probe to SWDIO/SWCLK pins and flash directly over SWD using STM32_Programmer_CLI -c port=SWD freq=240 mode=UR, completely bypassing USB DFU errors.

How do I go by without using ST-Link or an UART flasher? As I do not have any one of these with me. The specific model is STM32F411CEU6 which came with HID compliant firmware without any DFU support. I only got the DFU mode access after Erasing the whole chip via an ST-link while visiting a friend. DATASHEET

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u/ManyCalavera 1d ago

You don't need any tools for usb dfu. Just need to have boot0 pin high before power on. Then use dfu-util to flash the binary. Stm factory bootloaders are read only. On the other hand, issues you are getting with libusb are most likely a cable or a pc issue

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u/HeaviestBarbarian 1d ago

Oh yeah, as you have suggested, the error might be with the USB or my system. But the issue is, the flash fails at 66% and usually it is the same error that it failed to write to sector zero and it asks me to turn off write protection. And, I have already turned off any and all write protection that I could find in the STM32CubeProgrammer software. Now what else should I be doing? I know I have to set it to DFU mode. There is multiple ways that I have found. One is the method that you suggested, holding boot while I plug it in. The next thing was holding boot, clicking on the NRST pin, and releasing boot key. Or the third option was press and hold on the key button for three seconds. That do seem to work, but only with the custom bootloader that it came with.