nRF51822 with pyOCD and Arch Board

I’m quite excited that Bluetooth Low Energy (nRF51822) is comming to mbed. So I’m exploring what we can do with BLE (nRF51822). Preparing tools to get started with new things is always the beginning.

Here we use CMSIS-DAP and pyOCD. CMSIS-DAP is the software running on mbed interface to provide drag-n-drop, USB2UART communication and SWD debug. pyOCD is an Open Source python library or programming and debugging ARM Cortex-M microcontrollers using CMSIS-DAP.

First, use Arch as an mbed interface to run CMSIS-DAP.

  1. Download mbed interface firmware for Arch.
  2. Connect Arch with PC, long press Arch’s button and replace firmware.bin with the new firmware in “CRP DISABLD” drive on windows. use dd if=lpc11u24_nrf51822_if_mbed.bin of={path-to}/firmware.bin conv=notrunc on Linux/Mac
  3. Quick press the button. “MBED” drive will pop up.
  4. Install the mbed interface driver for windows to enable USB2UART function

CMSIS-DAP debug adapter

Second, setup pyOCD for nRF51822. We need pyOCD, pyUSB(Linux) or pyWinUSB(Windows) and

On Ubuntu

sudo apt-get install python-setuptools
sudo easy_install pyusb
sudo easy_install pyocd

On windows, install pyWinUSB instread of pyUSB.

Third, flash softdevice hex file or application binary file to nRF51822.

The softdevice hex file include two parts — Code Region 0(CR0) and User Information Configuration Registers(UICR). Here we use arm-none-eabi-objcopy to divide the hex file into two binary files for CR0 and UICR. It’s done in, so we just need to keep arm-none-eabi-objcop in the PATH variable.

To flash softdevice hex, just run

sudo python -s softdevice.hex

To flash an application binary

sudo python -a {application.bin}


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