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DAP Downloader

Overview

The debugger
is based on the ARM open-source DAP project (https://github.com/ARMmbed/DAPLink).
Hardware Overview:
The main controller uses an STM32F103C8T6.
The USB interface uses Type-C with an external current-limiting fuse and reverse connection protection diode.
The 5V to 3.3V converter uses an SOT-23 packaged LDO, which can provide a large current.
Since the JTAG interface is not commonly used, it is not yet supported.
The SWD interface and USB to TTL function have been tested.
The hardware interface definitions differ slightly from the official documentation, so it has been forked and modified: https://github.com/AFunnyMan/DAPLink_V1.
Usage:

Use the SWD interface provided with the DAP debugger to download the bootloader. After successful download, a USB drive will appear.
Drag the app into the USB drive. Wait a moment. If successful, a DAP-Link USB drive and a serial port
upgrade app will appear. Connect RST and GND, restart DAP, and a USB drive will appear. Drag the new version of the app into the USB drive to complete the upgrade.

The attached
stm32f103xb_bl.axf is the bootloader. You can use tools such as STM32 ST-LINK Utility or STM32CubeProgrammer to directly download
stm32f103xb_stm32f746zg_if.bin as the app and drag it directly into the USB drive.

Design Files

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Update:2026-03-26 13:12:54

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