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##
## This file is part of the sigrok project.
##
## Copyright (C) 2012 Iztok Jeras <iztok.jeras@gmail.com>
##
## 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
## 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, write to the Free Software
## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
##
# Maxim DS28EA00 protocol decoder
import sigrokdecode as srd
# Dictionary of FUNCTION commands and their names.
command = {
# Scratchpad
0x4e: 'Write scratchpad',
0xbe: 'Read scratchpad',
0x48: 'Copy scratchpad',
# Thermometer
0x44: 'Convert temperature',
0xb4: 'Read power mode',
0xb8: 'Recall EEPROM',
0xf5: 'PIO access read',
0xA5: 'PIO access write',
0x99: 'Chain',
}
class Decoder(srd.Decoder):
api_version = 1
id = 'maxim_ds28ea00'
name = 'Maxim DS28EA00'
longname = 'Maxim DS28EA00 1-Wire digital thermometer'
desc = '1-Wire digital thermometer with Sequence Detect and PIO'
license = 'gplv2+'
inputs = ['onewire_network']
outputs = ['maxim_ds28ea00']
probes = []
optional_probes = [
{'id': 'pioa', 'name': 'PIOA/DONE#',
'desc': 'PIOA channel and chain output'},
{'id': 'piob', 'name': 'PIOB/EN#',
'desc': 'PIOB channel and chain output'},
]
options = {}
annotations = [
['Text', 'Human-readable text'],
]
def __init__(self, **kwargs):
self.trn_beg = 0
self.trn_end = 0
self.state = 'ROM'
self.rom = 0x0000000000000000
def start(self, metadata):
self.out_ann = self.add(srd.OUTPUT_ANN, 'maxim_ds28ea00')
def report(self):
pass
def putx(self, data):
self.put(self.ss, self.es, self.out_ann, data)
def decode(self, ss, es, data):
code, val = data
self.ss, self.es = ss, es
# State machine.
if code == 'RESET/PRESENCE':
self.putx([0, ['Reset/presence: %s'
% ('true' if val else 'false')]])
self.state = 'ROM'
elif code == 'ROM':
self.rom = val
self.putx([0, ['ROM: 0x%016x' % (val)]])
self.state = 'COMMAND'
elif code == 'DATA':
if self.state == 'COMMAND':
if val not in command:
self.putx([0, ['Unrecognized command: 0x%02x' % val]])
return
self.putx([0, ['Function command: 0x%02x \'%s\''
% (val, command[val])]])
self.state = command[val].upper()
elif self.state == 'READ SCRATCHPAD':
self.putx([0, ['Scratchpad data: 0x%02x' % val]])
elif self.state == 'CONVERT TEMPERATURE':
self.putx([0, ['Temperature conversion status: 0x%02x' % val]])
elif self.state in [s.upper() for s in command.values()]:
self.putx([0, ['TODO \'%s\': 0x%02x' % (self.state, val)]])
else:
raise Exception('Invalid state: %s' % self.state)
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