Add example script that uses the ParamFileHelper.

The script will write all supplied parameters to the crazyflie and store them

cflib/utils/param_file_helper.py

@@ -25,6 +25,7 @@
 
 
 class ParamFileHelper:
+    '''ParamFileHelper is a helper to synchonously write multiple paramteters from a file and store them in persistent memory'''
     def __init__(self, crazyflie):
         if isinstance(crazyflie, Crazyflie):
             self._cf = crazyflie

examples/parameters/persistent_params_from_file.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+#
+# ,---------,       ____  _ __
+# |  ,-^-,  |      / __ )(_) /_______________ _____  ___
+# | (  O  ) |     / __  / / __/ ___/ ___/ __ `/_  / / _ \
+# | / ,--'  |    / /_/ / / /_/ /__/ /  / /_/ / / /_/  __/
+#    +------`   /_____/_/\__/\___/_/   \__,_/ /___/\___/
+#
+# Copyright (C) 2021 Bitcraze AB
+#
+# 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, in version 3.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# 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, see <http://www.gnu.org/licenses/>.
+"""
+Example to show how to write several persistent parameters from a yaml file.
+The params in the file should be formatted like this; 
+
+params:
+  activeMarker.back:
+    default_value: 3
+    is_stored: true
+    stored_value: 30
+type: persistent_param_state
+version: '1'
+"""
+import argparse
+import logging
+import cflib.crtp
+from cflib.crazyflie import Crazyflie
+from cflib.crazyflie.syncCrazyflie import SyncCrazyflie
+from cflib.utils import uri_helper
+from cflib.utils.param_file_helper import ParamFileHelper
+
+
+# uri = uri_helper.uri_from_env(default='usb://0')
+uri = uri_helper.uri_from_env(default='radio://0/37/2M/E7E7E7E7E7')
+
+# Only output errors from the logging framework
+logging.basicConfig(level=logging.ERROR)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-f', '--file', type=str, help='The yaml file containing the arguments. ')
+    args = parser.parse_args()
+
+    cflib.crtp.init_drivers()
+
+    cf = Crazyflie(rw_cache='./cache')
+    with SyncCrazyflie(uri, cf=cf) as scf:
+        writer = ParamFileHelper(scf.cf)
+        writer.store_params_from_file(args.file)
+
+