diff options
Diffstat (limited to 'decoders/ds2432')
| -rw-r--r-- | decoders/ds2432/__init__.py | 2 | ||||
| -rw-r--r-- | decoders/ds2432/pd.py | 51 |
2 files changed, 36 insertions, 17 deletions
diff --git a/decoders/ds2432/__init__.py b/decoders/ds2432/__init__.py index 7664b5b..c460e04 100644 --- a/decoders/ds2432/__init__.py +++ b/decoders/ds2432/__init__.py @@ -19,7 +19,7 @@ ''' This decoder stacks on top of the 'onewire_network' PD and decodes the -Maxim DS2432 (1-Wire 1Kbit protected EEPROM with SHA-1 engine) protocol. +Maxim DS243x (1-Wire EEPROM) protocol. ''' from .pd import Decoder diff --git a/decoders/ds2432/pd.py b/decoders/ds2432/pd.py index d50a6d8..0c51596 100644 --- a/decoders/ds2432/pd.py +++ b/decoders/ds2432/pd.py @@ -2,6 +2,7 @@ ## This file is part of the libsigrokdecode project. ## ## Copyright (C) 2017 Kevin Redon <kingkevin@cuvoodoo.info> +## Copyright (C) 2017 Soeren Apel <soeren@apelpie.net> ## ## 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 @@ -20,7 +21,7 @@ import sigrokdecode as srd # Dictionary of FUNCTION commands and their names. -commands = { +commands_2432 = { 0x0f: 'Write scratchpad', 0xaa: 'Read scratchpad', 0x55: 'Copy scratchpad', @@ -30,8 +31,18 @@ commands = { 0xa5: 'Read authenticated page', } -# Maxim DS2432 family code, present at the end of the ROM code. -family_code = 0x33 +commands_2433 = { + 0x0f: 'Write scratchpad', + 0xaa: 'Read scratchpad', + 0x55: 'Copy scratchpad', + 0xf0: 'Read memory', +} + +# Maxim DS243x family code, present at the end of the ROM code. +family_codes = { + 0x33: ('DS2432', commands_2432), + 0x23: ('DS2433', commands_2433), +} # Calculate the CRC-16 checksum. # Initial value: 0x0000, xor-in: 0x0000, polynom 0x8005, xor-out: 0xffff. @@ -51,13 +62,13 @@ def crc16(byte_array): class Decoder(srd.Decoder): api_version = 3 - id = 'ds2432' - name = 'DS2432' - longname = 'Maxim DS2432 1-Wire 1k-Bit Protected EEPROM with SHA-1 Engine' - desc = '1-Wire 1k-Bit Protected EEPROM with SHA-1 Engine.' + id = 'ds243x' + name = 'DS243x' + longname = 'Maxim DS2432/2433' + desc = 'Maxim DS243x series 1-Wire EEPROM protocol.' license = 'gplv2+' inputs = ['onewire_network'] - outputs = ['ds2432'] + outputs = ['ds243x'] annotations = ( ('text', 'Human-readable text'), ) @@ -65,6 +76,9 @@ class Decoder(srd.Decoder): def __init__(self): # Bytes for function command. self.bytes = [] + self.family_code = None + self.family = '' + self.commands = commands_2432 # Use max command set until we know better. def start(self): self.out_ann = self.register(srd.OUTPUT_ANN) @@ -82,22 +96,27 @@ class Decoder(srd.Decoder): self.bytes = [] elif code == 'ROM': self.ss, self.es = ss, es - self.putx([0, ['ROM: 0x%016x (family code %s to 0x%02x)' - % (val, 'matches' if family_code == (val & 0xff) - else 'does not match', family_code), - 'ROM: 0x%016x (family code %s)' - % (val, 'match' if family_code == (val & 0xff) - else 'mismatch')]]) + self.family_code = val & 0xff + + s = None + if self.family_code in family_codes: + self.family, self.commands = family_codes[val & 0xff] + s = 'is 0x%02x, %s detected' % (self.family_code, self.family) + else: + s = '%x%02x unknown' % (self.family_code) + + self.putx([0, ['ROM: 0x%016x (%s)' % (val, 'family code ' + s), + 'ROM: 0x%016x (%s)' % (val, self.family)]]) self.bytes = [] elif code == 'DATA': self.bytes.append(val) if 1 == len(self.bytes): self.ss, self.es = ss, es - if val not in commands: + if val not in self.commands: self.putx([0, ['Unrecognized command: 0x%02x' % val]]) else: self.putx([0, ['Function command: %s (0x%02x)' - % (commands[val], val)]]) + % (self.commands[val], val)]]) elif 0x0f == self.bytes[0]: # Write scratchpad if 2 == len(self.bytes): self.ss = ss |