2017-06-06 20:36:18 +08:00
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##
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## This file is part of the libsigrokdecode project.
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##
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## Copyright (C) 2012 Iztok Jeras <iztok.jeras@gmail.com>
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##
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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 General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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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 General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, see <http://www.gnu.org/licenses/>.
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##
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import sigrokdecode as srd
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# Dictionary of FUNCTION commands and their names.
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command = {
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# Scratchpad
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0x4e: 'Write scratchpad',
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0xbe: 'Read scratchpad',
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0x48: 'Copy scratchpad',
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# Thermometer
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0x44: 'Convert temperature',
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0xb4: 'Read power mode',
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0xb8: 'Recall EEPROM',
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0xf5: 'PIO access read',
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0xA5: 'PIO access write',
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0x99: 'Chain',
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}
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class Decoder(srd.Decoder):
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api_version = 3
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2017-06-06 20:36:18 +08:00
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id = 'ds28ea00'
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name = 'DS28EA00'
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longname = 'Maxim DS28EA00 1-Wire digital thermometer'
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desc = '1-Wire digital thermometer with Sequence Detect and PIO.'
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license = 'gplv2+'
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inputs = ['onewire_network']
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outputs = []
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tags = ['IC', 'Sensor']
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2017-06-06 20:36:18 +08:00
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annotations = (
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('text', 'Human-readable text'),
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)
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def __init__(self):
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2019-09-09 00:07:19 -07:00
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self.reset()
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def reset(self):
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2017-06-06 20:36:18 +08:00
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self.trn_beg = 0
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self.trn_end = 0
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self.state = 'ROM'
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self.rom = 0x0000000000000000
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def start(self):
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self.out_ann = self.register(srd.OUTPUT_ANN)
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def putx(self, data):
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self.put(self.ss, self.es, self.out_ann, data)
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def decode(self, ss, es, data):
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code, val = data
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self.ss, self.es = ss, es
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# State machine.
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if code == 'RESET/PRESENCE':
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self.putx([0, ['Reset/presence: %s'
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% ('true' if val else 'false')]])
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self.state = 'ROM'
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elif code == 'ROM':
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self.rom = val
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self.putx([0, ['ROM: 0x%016x' % (val)]])
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self.state = 'COMMAND'
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elif code == 'DATA':
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if self.state == 'COMMAND':
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if val not in command:
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self.putx([0, ['Unrecognized command: 0x%02x' % val]])
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return
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self.putx([0, ['Function command: 0x%02x \'%s\''
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% (val, command[val])]])
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self.state = command[val].upper()
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elif self.state == 'READ SCRATCHPAD':
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self.putx([0, ['Scratchpad data: 0x%02x' % val]])
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elif self.state == 'CONVERT TEMPERATURE':
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self.putx([0, ['Temperature conversion status: 0x%02x' % val]])
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elif self.state in [s.upper() for s in command.values()]:
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self.putx([0, ['TODO \'%s\': 0x%02x' % (self.state, val)]])
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