pymcuprog documentation

Python MCU programmer utility

pymcuprog is a utility for programming various Microchip MCU devices using Microchip CMSIS-DAP based debuggers


pymcuprog is available:

Command-line interface usage

For using pymcuprog as a CLI, see (

Library usage

pymcuprog can be used as a library using its backend API. For example:

# Setup logging - pymcuprog uses the Python logging module
import logging
logging.basicConfig(format="%(levelname)s: %(message)s", level=logging.WARNING)

# Configure the session:
from pymcuprog.backend import SessionConfig
sessionconfig = SessionConfig("atmega4808")

# Instantiate USB transport (only 1 tool connected)
from pymcuprog.toolconnection import ToolUsbHidConnection
transport = ToolUsbHidConnection()

# Instantiate backend
from pymcuprog.backend import Backend
backend = Backend()

# Connect to tool using transport

# Start the session

# Read the target device_id
device_id = backend.read_device_id()
print ("Device ID is {0:06X}".format(int.from_bytes(d, byteorder="little")))

# Print the pymcuprog package version:
from pymcuprog.version import VERSION as pymcuprog_version
print("pymcuprog version {}".format(pymcuprog_version))

# In addition, the CLI-backend API is versioned for convenience:
print("pymcuprog backend API version: {}".format(backend.get_api_version()))


This package uses the Python logging module for publishing log messages to library users. A basic configuration can be used (see example), but for best results a more thorough configuration is recommended in order to control the verbosity of output from dependencies in the stack which also use logging. See logging.yaml which is included in the package (although only used for CLI)


pymcuprog depends on pyedbglib for its transport protocol. pyedbglib requires a USB transport library like libusb. See pyedbglib package for more information.

Supported devices and tools

Note: pymcuprog is primarily intended for use with PKOB nano (nEDBG) debuggers which are found on Curiosity Nano kits and other development boards. This means that it is continuously tested with a selection of AVR devices with UPDI interface as well as a selection of PIC devices. However since the protocol is compatible between all EDBG-based debuggers (pyedbglib) it is possible to use pymcuprog with a wide range of debuggers and devices, although not all device families/interfaces have been implemented.

The following Atmel/Microchip debuggers are supported:
  • PKOB nano (nEDBG)

  • MPLAB PICkit 4 ICD (only when in ‘AVR mode’)

  • MPLAB Snap ICD (only when in ‘AVR mode’)

  • Atmel-ICE

  • Power Debugger

  • EDBG

  • mEDBG

  • JTAGICE3 (only firmware version 3.x)

Although not all functionality is provided on all debuggers/boards. See device support section below.

The following device-types are supported:
  • All AVR UPDI devices, whether mounted on kits or standalone

  • PIC devices mounted on Curiosity Nano kits, or similar board with PKOB nano (nEDBG) debugger

  • Other devices (eg ATmega328P, ATsamd21e18a) may be partially supported for experimental purposes


Indices and tables