82 lines
3.0 KiB
Python
82 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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'''
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librfid - RFID EPC Class 1 Gen2 / ISO/IEC 18000-6C compliant library
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Copyright (C) 2013 Entr'ouvert
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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Functions to parse reader command response content.
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'''
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from _exceptions import MalformedDataError, BadParameterException
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from utils import get_integer_on_two_bytes
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def get_rfsettings(response):
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'''
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Parse response content of 'Get_RFSettings' command.
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Return a list of dict describing logic ports of the reader.
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'''
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if not response.data:
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raise MalformedDataError('Data content is malformed.')
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if len(response.data) != 64:
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raise MalformedDataError('Data content is malformed.')
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logic_ports = list()
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for i in range(0, 16):
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logic_port = dict()
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logic_port['ScanDelay'] = int(response.data[i * 4:(i * 4) + 2]
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.encode('hex'), 16) * 10 # 0 ms ≤ ScanDelay ≤ 655350 ms ()
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power_ant_nb = int(response.data[(i * 4) + 2:(i * 4) + 4]
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.encode('hex'), 16)
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logic_port['AntNb'] = power_ant_nb & 0x000f
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logic_port['PowerAnt'] = (power_ant_nb >> 4) / 10
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#[0E6h ≤ PowerAnt ≤ 136h] soit [23 dBm ≤ PowerAnt ≤ 31 dBm] (URF)
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logic_ports.append(logic_port)
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response.processed_data = logic_ports
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def set_rfsettings(command):
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'''
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Parse response content of 'Get_RFSettings' command.
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Return a string representing the data from a list of dict describing
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logic ports of the reader..
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'''
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if not command.data_to_process:
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raise MalformedDataError('Data content is malformed.')
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logic_ports = command.data_to_process
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data = ''
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i = 0
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for logic_port in logic_ports:
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if logic_port['ScanDelay'] > 655350 or logic_port['PowerAnt'] > 31:
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raise BadParameterException('One bad parameter for logic port '
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'%s: ScanDelay %s PowerAnt %s'
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% (i, logic_port['ScanDelay'], logic_port['PowerAnt']))
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data += get_integer_on_two_bytes(logic_port['ScanDelay'] / 10)
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power_ant_nb = (logic_port['PowerAnt'] * 10) << 4
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power_ant_nb |= logic_port['AntNb']
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data += get_integer_on_two_bytes(power_ant_nb)
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i += 1
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for _ in range(i, 16):
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data += '\x00\x00\x00\x00'
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command.data_processed = data
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def set_rfsettings_saved(command):
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return set_rfsettings(command)
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