How to load micropython onto official stm32f407vgt6 Discovery board

[stuarte83]

Hi,

o.s.: Debian 12 Bookworm (fully updated)
board: (official) STM32f4-discovery
micropython: STM32F4DISC-20250911-v1.26.1.dfu
STM32CubeProgrammer v2.19.0

I'm trying to load Micropython onto the board listed above using ...Programmer but am having some problems doing so. I have connected both of the board's USB ports to the laptop.

When I set ...Programmer connection mode to ST-LINK the board is connected and is erroneously(!) identified in ...Programmer's "Target Information" list as a device of type STM32F2xx. In this connection mode, the board has both ST-LINK jumpers in place and ...Programmer does display a "File download complete" message after downloading the .dfu file even though it is displaying "No DFU detected".

When I set ...Programmer connection mode to USB, which I thought was necessary to flash/download a .dfu file to the board, ...Programmer does not connect to the board. In this connection mode, both ST-LINK jumpers are removed and one of them is used to jump BOOT0 to VDD. In this mode, ...Programmer shows "Not connected" in its top right corner. When I click on the (green) Connect button, the board remains "Not connected" and ...Programmer's "Target Information" list remains completely blank.

Could someone please point out what I am doing wrong and help me to correct my mistakes.

Stuart

[GitHubsSilverBullet]

Debian oldstable.
Using CN1 (Mini-USB) for flashing and CN5 (micro-USB) for work.

$ st-flash --format ihex  write STM32F4DISC-20250911-v1.26.1.hex
st-flash 1.6.1
2025-10-09T14:34:24 INFO common.c: F4xx: 192 KiB SRAM, 1024 KiB flash in at least 16 KiB pages.
2025-10-09T14:34:24 INFO common.c: Attempting to write 442916 (0x6c224) bytes to stm32 address: 134217728 (0x8000000)
EraseFlash - Sector:0x0 Size:0x4000 2025-10-09T14:34:25 INFO common.c: Flash page at addr: 0x08000000 erased
EraseFlash - Sector:0x1 Size:0x4000 2025-10-09T14:34:25 INFO common.c: Flash page at addr: 0x08004000 erased
EraseFlash - Sector:0x2 Size:0x4000 2025-10-09T14:34:25 INFO common.c: Flash page at addr: 0x08008000 erased
EraseFlash - Sector:0x3 Size:0x4000 2025-10-09T14:34:26 INFO common.c: Flash page at addr: 0x0800c000 erased
EraseFlash - Sector:0x4 Size:0x10000 2025-10-09T14:34:27 INFO common.c: Flash page at addr: 0x08010000 erased
EraseFlash - Sector:0x5 Size:0x20000 2025-10-09T14:34:29 INFO common.c: Flash page at addr: 0x08020000 erased
EraseFlash - Sector:0x6 Size:0x20000 2025-10-09T14:34:31 INFO common.c: Flash page at addr: 0x08040000 erased
EraseFlash - Sector:0x7 Size:0x20000 2025-10-09T14:34:33 INFO common.c: Flash page at addr: 0x08060000 erased
2025-10-09T14:34:33 INFO common.c: Finished erasing 8 pages of 131072 (0x20000) bytes
2025-10-09T14:34:33 INFO common.c: Starting Flash write for F2/F4/L4
2025-10-09T14:34:33 INFO flash_loader.c: Successfully loaded flash loader in sram
enabling 32-bit flash writes
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 32768
size: 16932
2025-10-09T14:34:44 INFO common.c: Starting verification of write complete
2025-10-09T14:34:53 INFO common.c: Flash written and verified! jolly good!
~/tmp$ picoterm 
--- Miniterm on /dev/ttyACM0  4000000,8,N,1 ---
--- Quit: Ctrl+W | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
MicroPython v1.26.1 on 2025-09-11; F4DISC with STM32F407
Type "help()" for more information.
>>> 

i    stlink-tools                  1.6.1+ds-3     1.6.1+ds-3    
OpenSource ST-Link tools replacement.
Flashing tools for STMicroelectronics STM32VL and STM32L. The
transport layers STLINKv1 and STLINKv2 are supported.        
This package contains commandline utilities for stlink, and  
modprobe and udev rules.                                     
Homepage: https://github.com/stlink-org/stlink               
                                                             

[stuarte83]

Hi Norbert, Thank you for your follow-up posting. Please see below the results of its use. Note that I had to prepend /Downloads onto the filename. ```sh $ st-flash --format ihex write Downloads/STM32F4DISC-20250911-v1.26.1.hex st-flash 1.7.0 2025-10-09T17:59:34 INFO common.c: F4xx: 192 KiB SRAM, 1024 KiB flash in at least 16 KiB pages. 2025-10-09T17:59:34 INFO common.c: Attempting to write 442916 (0x6c224) bytes to stm32 address: 134217728 (0x8000000) EraseFlash - Sector:0x0 Size:0x4000 2025-10-09T17:59:34 INFO common.c: Flash page at addr: 0x08000000 erased EraseFlash - Sector:0x1 Size:0x4000 2025-10-09T17:59:34 INFO common.c: Flash page at addr: 0x08004000 erased EraseFlash - Sector:0x2 Size:0x4000 2025-10-09T17:59:35 INFO common.c: Flash page at addr: 0x08008000 erased EraseFlash - Sector:0x3 Size:0x4000 2025-10-09T17:59:35 INFO common.c: Flash page at addr: 0x0800c000 erased EraseFlash - Sector:0x4 Size:0x10000 2025-10-09T17:59:35 INFO common.c: Flash page at addr: 0x08010000 erased EraseFlash - Sector:0x5 Size:0x20000 2025-10-09T17:59:37 INFO common.c: Flash page at addr: 0x08020000 erased EraseFlash - Sector:0x6 Size:0x20000 2025-10-09T17:59:39 INFO common.c: Flash page at addr: 0x08040000 erased EraseFlash - Sector:0x7 Size:0x20000 2025-10-09T17:59:41 INFO common.c: Flash page at addr: 0x08060000 erased 2025-10-09T17:59:41 INFO common.c: Finished erasing 8 pages of 131072 (0x20000) bytes 2025-10-09T17:59:41 INFO common.c: Starting Flash write for F2/F4/F7/L4 2025-10-09T17:59:41 INFO flash_loader.c: Successfully loaded flash loader in sram 2025-10-09T17:59:41 INFO flash_loader.c: Clear DFSR 2025-10-09T17:59:41 INFO common.c: enabling 32-bit flash writes 2025-10-09T17:59:47 INFO common.c: Starting verification of write complete 2025-10-09T17:59:51 INFO common.c ``` Flash written and verified! jolly good!

…

On Thu, 9 Oct 2025 at 13:41, Norbert ***@***.***> wrote: Debian oldstable. $ st-flash --format ihex write STM32F4DISC-20250911-v1.26.1.hex st-flash 1.6.1 2025-10-09T14:34:24 INFO common.c: F4xx: 192 KiB SRAM, 1024 KiB flash in at least 16 KiB pages. 2025-10-09T14:34:24 INFO common.c: Attempting to write 442916 (0x6c224) bytes to stm32 address: 134217728 (0x8000000) EraseFlash - Sector:0x0 Size:0x4000 2025-10-09T14:34:25 INFO common.c: Flash page at addr: 0x08000000 erased EraseFlash - Sector:0x1 Size:0x4000 2025-10-09T14:34:25 INFO common.c: Flash page at addr: 0x08004000 erased EraseFlash - Sector:0x2 Size:0x4000 2025-10-09T14:34:25 INFO common.c: Flash page at addr: 0x08008000 erased EraseFlash - Sector:0x3 Size:0x4000 2025-10-09T14:34:26 INFO common.c: Flash page at addr: 0x0800c000 erased EraseFlash - Sector:0x4 Size:0x10000 2025-10-09T14:34:27 INFO common.c: Flash page at addr: 0x08010000 erased EraseFlash - Sector:0x5 Size:0x20000 2025-10-09T14:34:29 INFO common.c: Flash page at addr: 0x08020000 erased EraseFlash - Sector:0x6 Size:0x20000 2025-10-09T14:34:31 INFO common.c: Flash page at addr: 0x08040000 erased EraseFlash - Sector:0x7 Size:0x20000 2025-10-09T14:34:33 INFO common.c: Flash page at addr: 0x08060000 erased 2025-10-09T14:34:33 INFO common.c: Finished erasing 8 pages of 131072 (0x20000) bytes 2025-10-09T14:34:33 INFO common.c: Starting Flash write for F2/F4/L4 2025-10-09T14:34:33 INFO flash_loader.c: Successfully loaded flash loader in sram enabling 32-bit flash writes size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 32768 size: 16932 2025-10-09T14:34:44 INFO common.c: Starting verification of write complete 2025-10-09T14:34:53 INFO common.c: Flash written and verified! jolly good! ~/tmp$ picoterm --- Miniterm on /dev/ttyACM0 4000000,8,N,1 --- --- Quit: Ctrl+W | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H --- MicroPython v1.26.1 on 2025-09-11; F4DISC with STM32F407 Type "help()" for more information. >>> i stlink-tools 1.6.1+ds-3 1.6.1+ds-3 OpenSource ST-Link tools replacement. Flashing tools for STMicroelectronics STM32VL and STM32L. The transport layers STLINKv1 and STLINKv2 are supported. This package contains commandline utilities for stlink, and modprobe and udev rules. Homepage: https://github.com/stlink-org/stlink — Reply to this email directly, view it on GitHub <#18230 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ARPH3RQGEIGJED5TNRIYLID3WZJWHAVCNFSM6AAAAACIW3ZQQOVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTINRTGY4DCMQ> . You are receiving this because you authored the thread.Message ID: ***@***.*** com>

[stuarte83]

I have now added a new rule to /etc/udev/rules.d called "00-usb-permissions.rules" which contains the following.

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="3748", MODE="0660", GROUP="plugdev"

This has not(!) allowed the laptop to "see" the board. I should state that I am a member of dialout and plugdev groups.

Does anyone have any other ideas/suggestions as to how to get the Debian Bookworm laptop to "see" the stm32f407 discovery board ?

[GitHubsSilverBullet]

Depends on what you mean.

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="3748", \
    MODE:="0666", \
    SYMLINK+="stlinkv2_%n"

That's what I have in ›49-stlinkv2.rules‹
But that's only for programming.
If you're concerned about ›ttyACM0‹, here that device is automagically created with

ls -l /dev/ttyA*
crw-rw----+ 1 root dialout 166, 0 11. Okt 16:35 /dev/ttyACM0

which is fine for everybody in thedialout group.

I am a member of dialout and plugdev groups.

Should you have added those just now in your current session, you''ll need to logout and login again to activate them.