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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2018 Max Weller
##
## 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 re
import sigrokdecode as srd
ann_cmdbit, ann_databit, ann_cmd, ann_data, ann_warning = range(5)
class Decoder(srd.Decoder):
api_version = 3
id = 'sda2506'
name = 'SDA2506'
longname = 'Siemens SDA 2506-5'
desc = 'Serial nonvolatile 1-Kbit EEPROM.'
license = 'gplv2+'
inputs = ['logic']
outputs = []
tags = ['IC', 'Memory']
channels = (
{'id': 'clk', 'name': 'CLK', 'desc': 'Clock'},
{'id': 'd', 'name': 'DATA', 'desc': 'Data'},
{'id': 'ce', 'name': 'CE#', 'desc': 'Chip-enable'},
)
annotations = (
('cmdbit', 'Command bit'),
('databit', 'Data bit'),
('cmd', 'Command'),
('data', 'Data byte'),
('warnings', 'Human-readable warnings'),
)
annotation_rows = (
('bits', 'Bits', (ann_cmdbit, ann_databit)),
('commands', 'Commands', (ann_cmd,)),
('data', 'Data', (ann_data,)),
('warnings', 'Warnings', (ann_warning,)),
)
def __init__(self):
self.samplerate = None
self.reset()
def reset(self):
self.cmdbits = []
self.databits = []
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
def putbit(self, ss, es, typ, value):
self.put(ss, es, self.out_ann, [typ, ['%s' % (value)]])
def putdata(self, ss, es):
value = 0
for i in range(8):
value = (value << 1) | self.databits[i]
self.put(ss, es, self.out_ann, [ann_data, ['%02X' % (value)]])
def decode_bits(self, offset, width):
out = 0
for i in range(width):
out = (out << 1) | self.cmdbits[offset + i][0]
return (out, self.cmdbits[offset + width - 1][1], self.cmdbits[offset][2])
def decode_field(self, name, offset, width):
val, ss, es = self.decode_bits(offset, width)
self.put(ss, es, self.out_ann, [ann_data, ['%s: %02X' % (name, val)]])
return val
def decode(self):
while True:
# Wait for CLK edge or CE edge.
clk, d, ce = self.wait([{0: 'e'}, {2: 'e'}])
if self.matched[0] and ce == 1 and clk == 1:
# Rising clk edge and command mode.
bitstart = self.samplenum
self.wait({0: 'f'})
self.cmdbits = [(d, bitstart, self.samplenum)] + self.cmdbits
if len(self.cmdbits) > 24:
self.cmdbits = self.cmdbits[0:24]
self.putbit(bitstart, self.samplenum, ann_cmdbit, d)
elif self.matched[0] and ce == 0 and clk == 0:
# Falling clk edge and data mode.
bitstart = self.samplenum
clk, d, ce = self.wait([{'skip': int(2.5 * (1e6 / self.samplerate))}, {0: 'r'}, {2: 'e'}]) # Wait 25 us for data ready.
if self.matched == (True, False, False):
self.wait([{0: 'r'}, {2: 'e'}])
if len(self.databits) == 0:
self.datastart = bitstart
self.databits = [d] + self.databits
self.putbit(bitstart, self.samplenum, ann_databit, d)
if len(self.databits) == 8:
self.putdata(self.datastart, self.samplenum)
self.databits = []
elif self.matched[1] and ce == 0:
# Chip enable edge.
try:
self.decode_field('addr', 1, 7)
self.decode_field('CB', 0, 1)
if self.cmdbits[0][0] == 0:
# Beginning read command.
self.decode_field('read', 1, 7)
self.put(self.cmdbits[7][1], self.samplenum,
self.out_ann, [ann_cmd, ['read' ]])
elif d == 0:
# Beginning write command.
self.decode_field('data', 8, 8)
addr, ss, es = self.decode_bits(1, 7)
data, ss, es = self.decode_bits(8, 8)
cmdstart = self.samplenum
self.wait({2: 'r'})
self.put(cmdstart, self.samplenum, self.out_ann,
[ann_cmd, ['Write to %02X: %02X' % (addr, data)]])
else:
# Beginning erase command.
val, ss, es = self.decode_bits(1, 7)
cmdstart = self.samplenum
self.wait({2: 'r'})
self.put(cmdstart, self.samplenum, self.out_ann,
[ann_cmd, ['Erase: %02X' % (val)]])
self.databits = []
except Exception as ex:
self.reset()
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