Flash and Lock STM32 devices

Bare minimum scripts to lock or unlock STM32 devices

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Tools

Install the following tools on your system.

Openocd

used version 0.10.0

Linux

sudo apt-get install openocd

Mac

See xpack OpenOCD Installation instructions or download latest released version, unzip it and change its rights.

wget https://github.com/xpack-dev-tools/openocd-xpack/releases/download/v0.10.0-14/xpack-openocd-0.10.0-14-darwin-x64.tar.gz
tar -zxvf xpack-openocd-0.10.0-14-darwin-x64.tar.gz
chmod -R -w xpack-openocd-0.10.0-14-darwin-x64

Move the files into your applications folder and create a symlink to use it with the same commands as on linux

sudo ln -s /Volumes/Macintosh\ HD/Applications/OpenOCD/ /usr/share/openocd

telnet

sudo apt-get install telnet

General

Run openocd with telnet

Call this in first terminal

openocd -d3 -f stlink-v2.cfg -c "transport select hla_swd" -f stm32f1x.cfg

open second terminal

telnet 127.0.0.1 4444

Programming with scripts

If the chip is locked, it can't be programmed until it is unlocked.

A power cycle is required after locking the chip to run the program.

Unlocking the chip will erase it's content completly.

Config

Config files for STLink are located at /usr/share/openocd/scripts/interface/, config for targets can be found at /usr/share/openocd/scripts/target/.

Be aware of different STLink versions, which only differ in one single char of VID.

Flashing

sh flash.sh path/to/some/file.bin

Flash a file with debug level 1

sh flash.sh path/to/some/file.bin -d1

Locking

Lock a STM32F1 with a STLink V2

sh lock.sh

Perform lock with debug level 2 on a STM32F1 with a STLink V2

sh lock.sh -d2

Use general_un_lock_st.sh to lock or unlock a general STM32 device. The following example is for an STM32F0 by using a STLink

sh un_lock_st.sh \
/Applications/OpenOCD/bin/openocd \
/Applications/OpenOCD/scripts \
stlink \
stm32f0x \
lock

Unlocking

Unlock a STM32F1 with a STLink V2

sh unlock.sh

Perform unlock with debug level 1 on a STM32F1 with a STLink V2

sh unlock.sh -d1

Use general_un_lock_st.sh to lock or unlock a general STM32 device. The following example is for an STM32F0 by using an STLink

sh un_lock_st.sh \
/Applications/OpenOCD/bin/openocd \
/Applications/OpenOCD/scripts \
stlink \
stm32f0x \
unlock

Power cycle (only on raspberry)

Power cycle the target by using a raspberry pi pin.

Connect VCC of the debug interface via a transistor or mosfet to VCC. The mosfet or transistor is controlled by the raspberry pi pin.

You have to run this script once to configure the pin and turn it on.

python power_cycle.py