diff options
Diffstat (limited to 'decoders/eeprom93cxx')
| -rw-r--r-- | decoders/eeprom93cxx/__init__.py | 32 | ||||
| -rw-r--r-- | decoders/eeprom93cxx/pd.py | 142 |
2 files changed, 174 insertions, 0 deletions
diff --git a/decoders/eeprom93cxx/__init__.py b/decoders/eeprom93cxx/__init__.py new file mode 100644 index 0000000..036f1f7 --- /dev/null +++ b/decoders/eeprom93cxx/__init__.py @@ -0,0 +1,32 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2017 Kevin Redon <kingkevin@cuvoodoo.info> +## +## 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, see <http://www.gnu.org/licenses/>. +## + +''' +This decoder stacks on top of the 'microwire' PD and decodes the 93Cxx EEPROM +specific instructions. + +The implemented instructions come from the STMicroelectronics M93Cx6 EEPROM +datasheet. They are compatible with the Atmel AT93Cxx EEPROM with slightly +different names. + +Warning: Other EEPROMs using Microwire might have different operation codes +and instructions. +''' + +from .pd import Decoder diff --git a/decoders/eeprom93cxx/pd.py b/decoders/eeprom93cxx/pd.py new file mode 100644 index 0000000..0fd6969 --- /dev/null +++ b/decoders/eeprom93cxx/pd.py @@ -0,0 +1,142 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2017 Kevin Redon <kingkevin@cuvoodoo.info> +## +## 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, see <http://www.gnu.org/licenses/>. +## + +import sigrokdecode as srd + +class Decoder(srd.Decoder): + api_version = 2 + id = 'eeprom93cxx' + name = '93Cxx EEPROM' + longname = '93Cxx EEPROM' + desc = '93Cxx series Microwire EEPROM protocol.' + license = 'gplv2+' + inputs = ['microwire'] + outputs = ['eeprom93cxx'] + options = ( + {'id': 'addresssize', 'desc': 'Address size', 'default': 8}, + {'id': 'wordsize', 'desc': 'Word size', 'default': 16}, + ) + annotations = ( + ('si-data', 'SI data'), + ('so-data', 'SO data'), + ('warning', 'Warning'), + ) + annotation_rows = ( + ('data', 'Data', (0, 1)), + ('warnings', 'Warnings', (2,)), + ) + + def __init__(self): + self.frame = [] + + def start(self): + self.out_ann = self.register(srd.OUTPUT_ANN) + self.addresssize = self.options['addresssize'] + self.wordsize = self.options['wordsize'] + + def put_address(self, data): + # Get address (MSb first). + a = 0 + for b in range(len(data)): + a += (data[b]['si'] << (len(data) - b - 1)) + self.put(data[0]['ss'], data[-1]['se'], self.out_ann, + [0, ['Address: 0x%x' % a, 'Addr: 0x%x' % a, '0x%x' % a]]) + + def put_word(self, si, data): + # Decode word (MSb first). + word = 0 + for b in range(len(data)): + if si: + word += (data[b]['si'] << (len(data) - b - 1)) + else: + word += (data[b]['so'] << (len(data) - b - 1)) + if si: + self.put(data[0]['ss'], data[-1]['se'], + self.out_ann, [0, ['Data: 0x%x' % word, '0x%x' % word]]) + else: + self.put(data[0]['ss'], data[-1]['se'], + self.out_ann, [1, ['Data: 0x%x' % word, '0x%x' % word]]) + + def decode(self, ss, es, data): + if len(data) < (2 + self.addresssize): + self.put(ss, es, self.out_ann, [2, ['Not enough packet bits']]) + return + + opcode = (data[0]['si'] << 1) + (data[1]['si'] << 0) + + if opcode == 2: + # READ instruction. + self.put(data[0]['ss'], data[1]['se'], + self.out_ann, [0, ['Read word', 'READ']]) + self.put_address(data[2:2 + self.addresssize]) + + # Get all words. + word_start = 2 + self.addresssize + while len(data) - word_start > 0: + # Check if there are enough bits for a word. + if len(data) - word_start < self.wordsize: + self.put(data[word_start]['ss'], data[len(data) - 1]['se'], + self.out_ann, [2, ['Not enough word bits']]) + break + self.put_word(False, data[word_start:word_start + self.wordsize]) + # Go to next word. + word_start += self.wordsize + elif opcode == 1: + # WRITE instruction. + self.put(data[0]['ss'], data[1]['se'], + self.out_ann, [0, ['Write word', 'WRITE']]) + self.put_address(data[2:2 + self.addresssize]) + # Get word. + if len(data) < 2 + self.addresssize + self.wordsize: + self.put(data[2 + self.addresssize]['ss'], + data[len(data) - 1]['ss'], + self.out_ann, [2, ['Not enough word bits']]) + else: + self.put_word(True, data[2 + self.addresssize:2 + self.addresssize + self.wordsize]) + elif opcode == 3: + # ERASE instruction. + self.put(data[0]['ss'], data[1]['se'], + self.out_ann, [0, ['Erase word', 'ERASE']]) + self.put_address(data[2:2 + self.addresssize]) + elif opcode == 0: + if data[2]['si'] == 1 and data[3]['si'] == 1: + # WEN instruction. + self.put(data[0]['ss'], data[2 + self.addresssize - 1]['se'], + self.out_ann, [0, ['Write enable', 'WEN']]) + elif data[2]['si'] == 0 and data[3]['si'] == 0: + # WDS instruction. + self.put(data[0]['ss'], data[2 + self.addresssize - 1]['se'], + self.out_ann, [0, ['Write disable', 'WDS']]) + elif data[2]['si'] == 1 and data[3]['si'] == 0: + # ERAL instruction. + self.put(data[0]['ss'], data[2 + self.addresssize - 1]['se'], + self.out_ann, [0, ['Erase all memory', + 'Erase all', 'ERAL']]) + elif data[2]['si'] == 0 and data[3]['si'] == 1: + # WRAL instruction. + self.put(data[0]['ss'], data[2 + self.addresssize - 1]['se'], + self.out_ann, [0, ['Write all memory', + 'Write all', 'WRAL']]) + # Get word. + if len(data) < 2 + self.addresssize + self.wordsize: + self.put(data[2 + self.addresssize]['ss'], + data[len(data) - 1]['ss'], + self.out_ann, [2, ['Not enough word bits']]) + else: + self.put_word(True, data[2 + self.addresssize:2 + self.addresssize + self.wordsize]) |