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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2019 Uli Huber
## Copyright (C) 2020 Soeren Apel
##
## 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
ann_bit, ann_type, ann_command, ann_parameter, ann_parity, ann_pos, ann_warning = range(7)
frame_type_none, frame_type_command, frame_type_16bit_pos, frame_type_18bit_pos = range(4)
class Decoder(srd.Decoder):
api_version = 3
id = 'xy2-100'
name = 'XY2-100'
longname = 'XY2-100(E) and XY-200(E) galvanometer protocol'
desc = 'Serial protocol for galvanometer positioning in laser systems'
license = 'gplv2+'
inputs = ['logic']
outputs = []
tags = ['Embedded/industrial']
channels = (
{'id': 'clk', 'name': 'CLK', 'desc': 'Clock'},
{'id': 'sync', 'name': 'SYNC', 'desc': 'Sync'},
{'id': 'data', 'name': 'DATA', 'desc': 'X, Y or Z axis data'},
)
annotations = (
('bit', 'Bit'),
('type', 'Frame Type'),
('command', 'Command'),
('parameter', 'Parameter'),
('parity', 'Parity'),
('position', 'Position'),
('warning', 'Human-readable warnings'),
)
annotation_rows = (
('bits', 'Bits', (ann_bit,)),
('data', 'Data', (ann_type, ann_command, ann_parameter, ann_parity)),
('positions', 'Positions', (ann_pos,)),
('warnings', 'Warnings', (ann_warning,)),
)
def __init__(self):
self.samplerate = None
self.reset()
def reset(self):
self.bits = []
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 put_ann(self, ss, es, ann_class, value):
self.put(ss, es, self.out_ann, [ann_class, value])
def process_bit(self, sync, bit_ss, bit_es, bit_value):
self.put_ann(bit_ss, bit_es, ann_bit, ['%d' % bit_value])
self.bits.append((bit_ss, bit_es, bit_value))
if sync == 0:
if len(self.bits) < 20:
self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Not enough data bits'])
self.reset()
return
# Bit structure:
# 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
# T --------------- 18-bit pos ----------------- PARITY or
# -TYPE-- ------------ 16-bit pos -------------- PARITY or
# -TYPE-- -8-bit command -8-bit parameter value- PARITY
# Calculate parity, excluding the parity bit itself
parity = 0
for ss, es, value in self.bits[:-1]:
parity ^= value
par_ss, par_es, par_value = self.bits[19]
parity_even = 0
parity_odd = 0
if (par_value == parity):
parity_even = 1
else:
parity_odd = 1
type_1_value = self.bits[0][2]
type_3_value = (self.bits[0][2] << 2) | (self.bits[1][2] << 1) | self.bits[2][2]
# Determine frame type
type = frame_type_none
parity_status = ['X', 'Unknown']
type_ss = self.bits[0][0]
type_es = self.bits[2][1]
### 18-bit position
if (type_1_value == 1) and (parity_odd == 1):
type = frame_type_18bit_pos
type_es = self.bits[0][1]
self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Careful: 18-bit position frames with wrong parity and command frames with wrong parity cannot be identified'])
### 16-bit position
elif (type_3_value == 1):
type = frame_type_16bit_pos
if (parity_even == 1):
parity_status = ['OK']
else:
parity_status = ['NOK']
self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Parity error', 'PE'])
### Command
elif (type_3_value == 7) and (parity_even == 1):
type = frame_type_command
self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Careful: 18-bit position frames with wrong parity and command frames with wrong parity cannot be identified'])
### Other
else:
self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Error', 'Unknown command or parity error'])
self.reset()
return
# Output command and parity annotations
if (type == frame_type_16bit_pos):
self.put_ann(type_ss, type_es, ann_type, ['16 bit Position Frame', '16 bit Pos', 'Pos', 'P'])
if (type == frame_type_18bit_pos):
self.put_ann(type_ss, type_es, ann_type, ['18 bit Position Frame', '18 bit Pos', 'Pos', 'P'])
if (type == frame_type_command):
self.put_ann(type_ss, type_es, ann_type, ['Command Frame', 'Command', 'C'])
self.put_ann(par_ss, par_es, ann_parity, parity_status)
# Output value
if (type == frame_type_16bit_pos) or (type == frame_type_18bit_pos):
pos = 0
if (type == frame_type_16bit_pos):
count = 15
for ss, es, value in self.bits[3:19]:
pos |= value << count
count -= 1
pos = pos if pos < 32768 else pos - 65536
else:
count = 17
for ss, es, value in self.bits[3:19]:
pos |= value << count
count -= 1
pos = pos if pos < 131072 else pos - 262144
self.put_ann(type_es, par_ss, ann_pos, ['%d' % pos])
if (type == frame_type_command):
count = 7
cmd = 0
cmd_es = 0
for ss, es, value in self.bits[3:11]:
cmd |= value << count
count -= 1
cmd_es = es
self.put_ann(type_es, cmd_es, ann_command, ['Command 0x%X' % cmd, 'Cmd 0x%X' % cmd, '0x%X' % cmd])
count = 7
param = 0
for ss, es, value in self.bits[11:19]:
param |= value << count
count -= 1
self.put_ann(cmd_es, par_ss, ann_parameter, ['Parameter 0x%X / %d' % (param, param), '0x%X / %d' % (param, param),'0x%X' % param])
self.reset()
def decode(self):
bit_ss = None
bit_es = None
bit_value = 0
sync_value = 0
while True:
# Wait for any edge on clk
clk, sync, data = self.wait({0: 'e'})
if clk == 1:
bit_es = self.samplenum
if bit_ss:
self.process_bit(sync_value, bit_ss, bit_es, bit_value)
bit_ss = self.samplenum
else:
bit_value = data
sync_value = sync
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