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# -*- coding: utf-8 -*-
# || ____ _ __
# +------+ / __ )(_) /_______________ _____ ___
# | 0xBC | / __ / / __/ ___/ ___/ __ `/_ / / _ \
# +------+ / /_/ / / /_/ /__/ / / /_/ / / /_/ __/
# || || /_____/_/\__/\___/_/ \__,_/ /___/\___/
# Copyright (C) 2014 Bitcraze AB
# Crazyflie Nano Quadcopter Client
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
This example connects to the first Crazyflie that it finds and writes to the
one wire memory.
Note: this example will not work with the BLE version of the nRF51 firmware
(flashed on production units).
import logging
import sys
import time
import cflib.crtp
from cflib.crazyflie import Crazyflie
from cflib.crazyflie.mem import MemoryElement
from cflib.crazyflie.mem import OWElement
# Only output errors from the logging framework
class WriteOwExample:
def __init__(self, link_uri):
""" Initialize and run the example with the specified link_uri """
# Create a Crazyflie object without specifying any cache dirs
self._cf = Crazyflie()
# Connect some callbacks from the Crazyflie API
print('Connecting to %s' % link_uri)
# Try to connect to the Crazyflie
# Variable used to keep main loop occupied until disconnect
self.is_connected = True
def _connected(self, link_uri):
""" This callback is called form the Crazyflie API when a Crazyflie
has been connected and the TOCs have been downloaded."""
print('Connected to %s' % link_uri)
mems = self._cf.mem.get_mems(MemoryElement.TYPE_1W)
print('Found {} 1-wire memories'.format(len(mems)))
if len(mems) > 0:
print('Writing test configuration to'
' memory {}'.format(mems[0].id))
mems[0].vid = 0xBC
mems[0].pid = 0xFF
board_name_id = OWElement.element_mapping[1]
board_rev_id = OWElement.element_mapping[2]
mems[0].elements[board_name_id] = 'Test board'
mems[0].elements[board_rev_id] = 'A'
def _data_written(self, mem, addr):
print('Data written, reading back...')
def _data_updated(self, mem):
print('Updated id={}'.format(
print('\tType : {}'.format(mem.type))
print('\tSize : {}'.format(mem.size))
print('\tValid : {}'.format(mem.valid))
print('\tName : {}'.format(
print('\tVID : 0x{:02X}'.format(mem.vid))
print('\tPID : 0x{:02X}'.format(
print('\tPins : 0x{:02X}'.format(mem.pins))
print('\tElements : ')
for key in mem.elements:
print('\t\t{}={}'.format(key, mem.elements[key]))
def _stab_log_error(self, logconf, msg):
"""Callback from the log API when an error occurs"""
print('Error when logging %s: %s' % (, msg))
def _stab_log_data(self, timestamp, data, logconf):
"""Callback froma the log API when data arrives"""
print('[%d][%s]: %s' % (timestamp,, data))
def _connection_failed(self, link_uri, msg):
"""Callback when connection initial connection fails (i.e no Crazyflie
at the speficied address)"""
print('Connection to %s failed: %s' % (link_uri, msg))
self.is_connected = False
def _connection_lost(self, link_uri, msg):
"""Callback when disconnected after a connection has been made (i.e
Crazyflie moves out of range)"""
print('Connection to %s lost: %s' % (link_uri, msg))
def _disconnected(self, link_uri):
"""Callback when the Crazyflie is disconnected (called in all cases)"""
print('Disconnected from %s' % link_uri)
self.is_connected = False
if __name__ == '__main__':
print('This example will not work with the BLE version of the nRF51'
' firmware (flashed on production units). See'
# Initialize the low-level drivers (don't list the debug drivers)
# Scan for Crazyflies and use the first one found
print('Scanning interfaces for Crazyflies...')
available = cflib.crtp.scan_interfaces()
print('Crazyflies found:')
for i in available:
if len(available) > 0:
le = WriteOwExample(available[0][0])
print('No Crazyflies found, cannot run example')
# The Crazyflie lib doesn't contain anything to keep the application alive,
# so this is where your application should do something. In our case we
# are just waiting until we are disconnected.
while le.is_connected:
except KeyboardInterrupt:
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