If you've ever needed to update firmware on an STM32-based device, you know the struggle—setting up an debugger, dealing with drivers, and ensuring proper connections. What if you could do it all without a dedicated programmer, using just your M5Stack Core2 or CoreS3? Enter M5 DAPLink, a powerful solution that transforms your M5 device into a standalone offline programmer.
Why Use M5 DAPLink?
Imagine being able to flash firmware anywhere, anytime—without needing a PC connection or extra hardware. Whether you're in the field, a classroom, or a factory line, M5 DAPLink makes firmware updates seamless. Just load your firmware onto a MicroSD card (for Core2) or a virtual USB drive (for CoreS3), and you're ready to go!
1. Preparations
Required hardware:
• Core2 / CoreS3
• Module Bus
• MicroSD card
• Card reader
• Male-to-female Dupont wires
• Female-to-female Dupont wires
2. Flashing the DAPLink Firmware
M5Burner
Download the M5Burner firmware flashing tool for your operating system from the links below. Extract and launch the application.
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Software Version |
Download Link |
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M5Burner_Windows |
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M5Burner_MacOS |
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M5Burner_Linux |
Open the burner tool, select the corresponding device type from the left menu, and download the matching firmware for your device.
CoreS3 DAPLink
Download the firmware for CoreS3: CoreS3 → CoreS3 DAPLink. Refer to the CoreS3 documentation to learn how to enter download mode. Once the device is detected by your computer, proceed with flashing.
CoreS2 DAPLink
Download the firmware for Core2: Core2 → Core2 DAPLink. Refer to the Core2 documentation to install the required USB driver. Once the device is detected, proceed with flashing.
3. Importing Flashing Algorithms and Firmware
Download the algorithm package below. This package, along with the firmware, is imported into the host device and used to match different chip models during flashing. Some algorithms are preloaded in the firmware, while manual import allows for additional algorithm support. Import methods vary by device—refer to the details below.
• Virtual USB Drive Import
This method is currently only supported for CoreS3.
Extract the algorithm package and copy it to the CoreS3 virtual USB drive. Create a program folder in the root directory to store the firmware files (hex/bin) for flashing.
• MicroSD Import
This method is currently only supported for Core2.
Extract the algorithm package and copy it to the MicroSD card. Create a program folder in the root directory to store the firmware files (hex/bin). The directory structure is the same as the CoreS3 virtual USB method.
• Web Import
This method works for both Core2 and CoreS3. Imported data is automatically saved to the device's flash storage partition. (Note: For Core2 with an SD card, files are stored on the SD card. For CoreS3, safely eject the virtual USB drive before importing via the web.)
Power on the device to enable its AP hotspot. Connect your computer to the hotspot and visit 192.168.4.1 in a browser. Click Program to navigate to the file upload page, then upload the algorithm and firmware files.
4. Device Connection
The DAPLink pin mappings for the firmware are as follows:
For example, to update the firmware of a Unit EXT.IO2, locate the programming pads after opening the device casing and connect them according to the pin mapping above. If contact is unstable, tilt the Dupont wire pins to ensure proper connection.
5. Starting the Flashing Process
After importing the algorithms and firmware, the device will display available options upon startup. Select the algorithm and firmware matching your target device. Click Idle, then Busy to begin flashing. (Note: Some chips, like STM32F0xx series, may require pressing Busy twice.)
6. Using with Module Bus
For daily DAPLink debugging, the Module Bus is highly recommended for easier wiring. It extends the MBus interface to the board's edge and includes two sets of 2.54-15P 90° headers for seamless Dupont wire connections.
Why M5 DAPLink is a Game-Changer
• No extra hardware needed – Your M5 device becomes a portable STM32 programmer.
• Works offline – No need for a PC once set up.
• Flexible import methods – USB, SD card, or web upload.
• Perfect for fieldwork and education – Quick firmware updates anywhere.
With M5 DAPLink, you turn ideas into reality faster—no hassle, no complicated setups. Ready to give it a try? Download the firmware today and start flashing like a pro!