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You can run CircuitPython on STM32 hardware, but support is not universal: the documented port covers selected STM32 F4, F7, and H7 chips, and you must match the exact board to a supported CircuitPython configuration. Once you have the right target, connect to the correct USB port, install its firmware, and upload a code.py file to the CIRCUITPY drive.
Check whether your exact STM32 board is supported
Start with the CircuitPython STM32 port documentation. It documents support for the F4, F7, and H7 families, but that does not mean every chip in those families—or every board built around them—has an official, ready-to-use image. The port uses board-specific pin maps and configuration, so confirm that your precise board has a matching target before buying it or attempting a flash.
The Feather STM32F405 Express is a concrete STM32F4 target in the documentation. Treat it as an example of a documented board target, not as evidence that any STM32F405 board has the same firmware configuration or pin assignments.
Choose a board for your setup
Compare candidate boards on compatibility first, then on how you will program and use them:
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
- Exact CircuitPython target: Look for a configuration matching the board, not just its MCU family.
- Programming options: Check whether the board has an integrated ST-Link debugger/programmer or whether you will need another flashing route.
- USB routing and power: Identify which connector reaches the MCU USB interface and whether another connector is needed to power or debug the board.
- Pins and peripherals: Match the board’s mapped pins and supported peripherals to the LED, sensor, or other hardware you intend to use.
- Documentation: Make sure you can find the board manual and its CircuitPython pin and setup information.
ST’s Nucleo range includes Nucleo-32, Nucleo-64, and Nucleo-144 boards, with different connectors and configurations. For example, ST identifies the NUCLEO-F446RE as an STM32F446RE Nucleo-64 with Arduino and ST Morpho connectivity. Those features do not establish that CircuitPython has an exact target for it. Verify that target before treating a Nucleo as plug-and-play.
Find the USB port that CircuitPython uses
On many ST Nucleo and Discovery boards, the primary USB connector is wired to the integrated ST-Link debugger. A separate USB OTG connector may provide access to the MCU’s USB interface, which is the connection used for CircuitPython. The arrangement varies by model; consult the board manual and the ST Nucleo board overview rather than relying on connector position or labeling alone.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Some boards may still need the ST-Link connector attached for power even when you use the MCU’s USB connection for CircuitPython. Check your model’s manual for its power requirements. ST says Nucleo boards include an STLINK debugger/programmer, but that built-in tool does not guarantee CircuitPython support for the board.
Install CircuitPython firmware
The available flashing method depends on the board and chip. The STM32 port documentation describes programming and debugging with ST-Link, as well as a built-in ROM DFU route for relevant F4, F7, and H7 chips that do not have a debugger. DFU is not a universal substitute for checking the exact board instructions.
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Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Use the board’s documented ST-Link route
If your board has an integrated ST-Link, follow the CircuitPython port and board documentation for programming and debugging. If your board lacks a debugger, an external ST-Link/SWD debugger may be useful, but it is optional when an appropriate onboard debugger or DFU route is available.
Use ROM DFU where the board supports it
For the documented DFU procedure, BOOT0 must be high and BOOT1 low when the board resets. The physical switches or jumpers used to set those states depend on the board, so follow its manual rather than copying a switch sequence from another model. The guide identifies STM32CubeProgrammer for Windows and dfu-util for macOS and Linux. Use the port’s instructions for the firmware and programming steps that match your target.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Connect to CircuitPython and upload your first script
- Connect the MCU’s CircuitPython USB interface. Use the connector routed to the MCU, not the ST-Link USB connector unless the board’s documentation says it serves that role. Supply power as the manual requires.
- Confirm the storage drive appears. After CircuitPython starts, look for a drive named
CIRCUITPY. - Create a small
code.py. Save it at the root of theCIRCUITPYdrive. A simple first project can use the board’s status LED or a sensor supported by that board. - Use the CDC serial connection for the REPL. CircuitPython exposes a CDC virtual serial connection for its interactive prompt and debugging. Mu is one editor and terminal option mentioned in the setup documentation.
Pin names and hardware APIs depend on the board configuration. Use the matching board pinout and current CircuitPython documentation; an example written for another board may refer to unavailable pins or peripherals.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Troubleshoot common first-setup problems
- No CircuitPython drive appears: Confirm you used the MCU’s USB interface, that the board is powered as required, and that firmware for the exact board target was installed.
- The board connects only as a debugger: You may be plugged into the ST-Link connector rather than the MCU’s USB port. Check the connector routing in the manual.
- DFU is not detected: Recheck BOOT0 high and BOOT1 low during reset, then verify the board-specific switch or jumper settings and the host tool instructions.
- A sample script fails on a pin or peripheral: Check that it matches your board’s pin mapping and supported hardware APIs rather than assuming another STM32 board uses the same configuration.
