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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2019 Uli Huber
##
## 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_hdrbit, ann_databit, ann_paritybit, ann_bitlegende, ann_pos, ann_warning = range(6)
class Decoder(srd.Decoder):
api_version = 3
id = 'xy2-100'
name = 'XY2-100'
longname = 'XY2-100 Galvo Protocol'
desc = 'Serial protocol for Galvo positioning'
license = 'gplv2+'
inputs = ['logic']
outputs = []
tags = ['Embedded/industrial']
channels = (
{'id': 'clk', 'name': 'D0', 'desc': 'Clock','default': 0},
{'id': 'sync', 'name': 'D1', 'desc': 'Sync','default': 1},
{'id': 'PosX', 'name': 'D2', 'desc': 'X/Y/Z','default': 2},
)
annotations = (
('hdrbit', 'Header bit'),
('databit', 'Data bit'),
('paritybit', 'Parity bit'),
('bitlegende', 'Bit Legende'),
('position', 'Position Data'),
('warning', 'Human-readable warnings'),
)
annotation_rows = (
('bits', 'Bits', (ann_hdrbit, ann_databit, ann_paritybit)),
('legende', 'Legende', (ann_bitlegende,)),
('positions', 'Position', (ann_pos,)),
('warnings', 'Warnings', (ann_warning,)),
)
def __init__(self):
self.samplerate = None
self.reset()
def reset(self):
self.hdrbits = []
self.databits = []
self.paritybits = []
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 decode(self):
headerstart = 0
datastart = 0
dataend = 0
lastsample = 0
while True:
# Wait for any edge CLK or SYNC
clk, sync, PosX = self.wait({0: 'r'})
bitstart = self.samplenum
bitend = bitstart+(bitstart-lastsample)
# start data collection
if sync == 1:
# wait for falling edge clk
clk, sync, PosX = self.wait({0: 'f'})
if len(self.hdrbits) < 3:
if len(self.hdrbits) == 0:
headerstart = bitstart
self.hdrbits = [(PosX, bitstart, self.samplenum)] + self.hdrbits
self.putbit(bitstart, bitend, ann_hdrbit, PosX)
else:
if len(self.databits) == 0:
datastart = bitstart
self.databits = [(PosX, bitstart, self.samplenum)] + self.databits
#self.putbit(bitstart, self.samplenum+1, ann_databit, PosX)
self.putbit(bitstart,bitend, ann_databit, PosX)
dataend = bitend
# get parity bit, calculate position
elif sync == 0:
clk, sync, PosX = self.wait({0: 'f'})
self.paritybits = [PosX]
self.putbit(dataend, bitend, ann_paritybit, PosX)
self.put(dataend,bitend, self.out_ann, [ann_bitlegende, ['Parity' ]])
self.put(headerstart,datastart, self.out_ann, [ann_bitlegende, ['Header' ]])
self.put(datastart, dataend, self.out_ann, [ann_bitlegende, ['Position' ]])
par=0
for x in self.hdrbits:
par ^= x[0]&1
positionX = 0
stelle = 0
for x in self.databits:
par ^= x[0]&1
if x[0] == 1:
positionX = positionX + (1 << stelle)
stelle += 1
self.put(datastart, dataend, self.out_ann, [ann_pos, ['%02d' % (positionX)]])
check = 'NOK'
if PosX == par:
check = 'OK'
self.put(dataend, bitend, self.out_ann, [ann_pos, ['%02s' % (check)]])
#self.put(datastart, self.samplenum, self.out_ann,
#[ann_warning, ['%s: %02X' % ('WARNUNG: ', 4711)]])
self.databits = []
self.hdrbits = []
lastsample = bitstart
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