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##
## 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 Microwire 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].es, 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)):
d = data[b].si if si else data[b].so
word += (d << (len(data) - b - 1))
idx = 0 if si else 1
self.put(data[0].ss, data[-1].es,
self.out_ann, [idx, ['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].es,
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].es,
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].es,
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].es,
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].es,
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].es,
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].es,
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].es,
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])
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