The MCU-Link-MR debug probe has been updated :-).

The MCU-Link-MR is a CMSIS-DAP debug probe for ARM Cortex-M devices with extra features for mobile robot and drone debugging. The project is open source and available on GitHub with KiCAD files and BOM.

I have built the new PCB back in October this year. But only these days I have found time to assemble and test the new board.

The version of the PCB has been bumped to v0.5.

Compared to the v0.2 version which you can order from NXP or from distributors, the v0.5 includes the following major changes:

• UART with flow control (RTS/CTS), with level-shifter and solder jumper to disconnect the signals
• 3-pin 2.54 mm Pixhawk logic analyzer header
• Reduced BOM costs with 0402 parts instead of 0603
• Silkscreen cleanup and simplification

Especially the UART flow control plus the logic analyzer pins are a plus dealing with any debugging target.

All the design files are on GitHub, so you can build your own debug probe. With the BOM and design files you can order it from PCB vendors too (e.g. PCBWay).

Happy debugging 🙂

Links

• Official MCU-Link-MR from NXP: https://www.nxp.com/design/design-center/development-boards-and-designs/MCU-LINK-MR
• Design files on GitHub: https://github.com/ErichStyger/MCU-Link-MR
• https://mcuoneclipse.com/2024/05/05/cmsis-dap-debug-probe-for-robots-and-pixhawk-with-kicad/
• https://mcuoneclipse.com/2025/04/13/mcu-link-mr-affordable-cmsis-dap-debug-probe-for-robotics-and-beyond/
• Post about MCU-Link-MR: https://mcuoneclipse.com/tag/mcu-link-mr/