Turn a mbed-enabled development board with USB into a CMSIS-DAP debug probe.

mbed CMSIS-DAP is based on mbed os 5. If you prefer to using mbed os 2, you can try Simple-CMSIS-DAP

git clone https://github.com/xiongyihui/mbed-CMSIS-DAP.git
cd mbed-CMSIS-DAP
pip install mbed-cli
mbed deploy
mbed compile -t gcc_arm -m nrf52840_dk

Devices supported by mbed os 5 usb stack should be supported, such as nRF52840, LPC17xx and STM32.

Tested devices:

• nRF52840

  • nRF52840-MDK USB Dongle
  • nRF52840-MDK
  • Pitaya Go

1. Download pre-built firmware CMSIS-DAP for nRF52840 MDK USB Dongle

2. Use nRF Connect Desktop or nRF Util to upgrade the firmware via its bootloader

   pip3 install nrfutil
   nrfutil pkg generate --hw-version 52 --application-version 1 --sd-req 0x00 --application cmsis-dap-for-nrf52840-mdk-usb-dongle-0x1000.hex cmsis-dap.zip
   nrfutil dfu usb-serial -pkg cmsis-dap.zip -p /dev/ttyACM0
   

3. Connect the USB Dongle with a ARM microcontroller through SWD interface

   • nRESET - p0.6
   • SWCLK - p0.7
   • SWDIO - p0.8