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DAPLink on STLINK
This document describes how to build, flash and use the DAPLink interface firmware on ST-LINK/V2(-1) and clones.
The firmware runs at 72 MHz. Some ST-LINK clones use cheaper STM32F101 MCU which may run unstable because of the 36 MHz maximum supported clock.
cd DAPLink
git checkout develop
pip install virtualenv
virtualenv venv
source venv/bin/activate
pip install -r requirements.txt
tools/progen_compile.py stlinkclone_if
The compiled firmware is in projectfiles/make_gcc_arm/stlinkclone_if/build/stlinkclone_if.bin.
This step doesn't remove the ST bootloader so you can revert to ST-LINK firmware at any time using the official ST-LINK upgrade tool.
You need stlink-tool to talk with ST bootloader.
stlink-tool projectfiles/make_gcc_arm/stlinkclone_if/build/stlinkclone_if.bin
If you replug ST-LINK/V2 it always boots to ST bootloader. Call stlink-tool without arguments to switch to DAPLink.
To automate this add something like this to your udev config:
SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="3748", ACTION=="add", RUN+="/usr/local/bin/stlink-tool"
The above line runs /usr/local/bin/stlink-tool automatically after detecting new ST-LINK/V2 on USB (0483:3748). Change the path to stlink-tool if different than /usr/local/bin/stlink-tool.