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DSView/libsigrokdecode4DSL/decoders/rgb_led_ws281x/pd.py

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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2016 Vladimir Ermakov <vooon341@gmail.com>
## Copyright (C) 2023 DreamSourceLab <support@dreamsourcelab.com>
## Copyright (C) 2021 Michael Miller <makuna@live.com>
##
## 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 3 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
from functools import reduce
class SamplerateError(Exception):
pass
class Decoder(srd.Decoder):
api_version = 3
id = 'rgb_led_ws281x'
name = 'RGB LED WS2812+'
longname = 'RGB LED color decoder'
desc = 'Decodes colors from bus pulses for single wire RGB leds like APA106, WS2811, WS2812, WS2813, SK6812, TM1829, TM1814, and TX1812.'
license = 'gplv3+'
inputs = ['logic']
outputs = []
tags = ['Display', 'IC']
channels = (
{'id': 'din', 'name': 'DIN', 'desc': 'DIN data line', 'idn':'dec_rgb_led_ws281x_chan_din'},
)
options = (
{'id': 'colors', 'desc': 'Colors', 'default': 'GRB',
'values': ( 'GRB', 'RGB', 'BRG', 'RBG', 'BGR', 'GRBW', 'RGBW', 'WRGB', 'LBGR', 'LGRB', 'LRGB', 'LRBG', 'LGBR', 'LBRG')
, 'idn':'dec_rgb_led_ws281x_opt_colors'},
{'id': 'polarity', 'desc': 'Polarity', 'default': 'normal',
'values': ('normal', 'inverted'), 'idn':'dec_rgb_led_ws281x_opt_polarity'},
)
annotations = (
('bit', 'Bit'),
('reset', 'RESET'),
('rgb', 'RGB'),
)
annotation_rows = (
('bit', 'Bits', (0, 1)),
('rgb', 'RGB', (2,)),
)
def __init__(self):
self.reset()
def reset(self):
self.state = 'FIND RESET'
self.samplerate = None
self.ss_packet = None
self.ss = None
self.es = None
self.bits = []
self.bit_ = None
self.colorsize = None
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
def handle_bits(self, samplenum):
if len(self.bits) == self.colorsize:
elems = reduce(lambda a, b: (a << 1) | b, self.bits)
if self.colorsize == 24:
if self.options['colors'] == 'GRB':
rgb = (elems & 0xff0000) >> 8 | (elems & 0x00ff00) << 8 | (elems & 0x0000ff)
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['GRB#%06x' % rgb]])
elif self.options['colors'] == 'RGB':
rgb = elems
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['RGB#%06x' % rgb]])
elif self.options['colors'] == 'BRG':
rgb = (elems & 0xffff00) >> 8 | (elems & 0x0000ff) << 16
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['BRG#%06x' % rgb]])
elif self.options['colors'] == 'RBG':
rgb = (elems & 0xff0000) | (elems & 0x00ff00) >> 8 | (elems & 0x0000ff) << 8
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['RBG#%06x' % rgb]])
elif self.options['colors'] == 'BGR':
rgb = (elems & 0xff0000) >> 16 | (elems & 0x00ff00) | (elems & 0x0000ff) << 16
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['BGR#%06x' % rgb]])
else:
if self.options['colors'] == 'GRBW':
rgb = (elems & 0xff000000) >> 16 | (elems & 0x00ff0000) | (elems & 0x0000ff00) >> 8
w = (elems & 0x000000ff)
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['GRB#%06x W#%02x' % (rgb, w)]])
elif self.options['colors'] == 'RGBW':
rgb = (elems & 0xffffff00) >> 8
w = (elems & 0x000000ff)
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['RGB#%06x W#%02x' % (rgb, w)]])
elif self.options['colors'] == 'WRGB':
rgb = (elems & 0xffffff00) >> 8
w = (elems & 0x000000ff)
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['W#%02x RGB#%06x ' % (w, rgb)]])
elif self.options['colors'] == 'LBGR':
rgb = (elems & 0x0000ff00) | (elems & 0x00ff0000) >> 16 | (elems & 0x000000ff) << 16
w = (elems & 0xff000000) >> 24
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['L#%02x BGR#%06x ' % (w, rgb)]])
elif self.options['colors'] == 'LGRB':
rgb = (elems & 0x000000ff) | (elems & 0x00ff0000) >> 8 | (elems & 0x0000ff00) << 8
w = (elems & 0xff000000) >> 24
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['L#%02x GRB#%06x ' % (w, rgb)]])
elif self.options['colors'] == 'LRGB':
rgb = (elems & 0x00ffffff)
w = (elems & 0xff000000) >> 24
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['L#%02x RGB#%06x ' % (w, rgb)]])
elif self.options['colors'] == 'LRBG':
rgb = (elems & 0x00ff0000) | (elems & 0x0000ff00) >> 8 | (elems & 0x000000ff) << 8
w = (elems & 0xff000000) >> 24
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['L#%02x RBG#%06x ' % (w, rgb)]])
elif self.options['colors'] == 'LGBR':
rgb = (elems & 0x00ff0000) >> 16 | (elems & 0x0000ffff) << 8
w = (elems & 0xff000000) >> 24
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['L#%02x GRB#%06x ' % (w, rgb)]])
elif self.options['colors'] == 'LBRG':
rgb = (elems & 0x00ffff00) >> 8 | (elems & 0x000000ff) << 16
w = (elems & 0xff000000) >> 24
self.put(self.ss_packet, samplenum, self.out_ann,
[2, ['L#%02x BRG#%06x ' % (w, rgb)]])
self.bits = []
self.ss_packet = samplenum
def check_bit_(self, samplenum):
period = samplenum - self.ss
tH_samples = self.es - self.ss
tH = tH_samples / self.samplerate
if tH >= 625e-9:
self.bit_ = True
else:
# Ideal duty for T0H: 33%, T1H: 66%.
self.bit_ = (tH_samples / period) > 0.5
def end(self):
if self.state == 'BIT FALLING':
self.check_bit_(self.last_samplenum)
self.put(self.ss, self.es, self.out_ann,
[0, ['%d' % self.bit_]])
self.bits.append(self.bit_)
self.handle_bits(self.es)
def decode(self):
if not self.samplerate:
raise SamplerateError('Cannot decode without samplerate.')
if len(self.options['colors']) == 4:
self.colorsize = 32
else:
self.colorsize = 24
while True:
if self.state == 'FIND RESET':
self.wait({0: 'l' if self.options['polarity'] == 'normal' else 'h'})
self.ss = self.samplenum
self.wait({0: 'e'})
self.es = self.samplenum
if ((self.es - self.ss) / self.samplerate > 50e-6):
self.state = 'RESET'
elif ((self.es - self.ss) / self.samplerate > 3e-6):
self.bits = []
self.ss = self.samplenum
self.ss_packet = self.samplenum
self.wait({0: 'e'})
self.state = 'BIT FALLING'
elif self.state == 'RESET':
self.put(self.ss, self.es, self.out_ann, [1, ['RESET', 'RST', 'R']])
self.bits = []
self.ss = self.samplenum
self.ss_packet = self.samplenum
self.wait({0: 'e'})
self.state = 'BIT FALLING'
elif self.state == 'BIT FALLING':
self.es = self.samplenum
self.wait({0: 'e'})
if ((self.samplenum - self.es) / self.samplerate > 50e-6):
self.check_bit_(self.samplenum)
self.put(self.ss, self.es, self.out_ann,
[0, ['%d' % self.bit_]])
self.bits.append(self.bit_)
self.handle_bits(self.es)
self.ss = self.es
self.es = self.samplenum
self.state = 'RESET'
else:
self.state = 'BIT RISING'
elif self.state == 'BIT RISING':
self.check_bit_(self.samplenum)
self.put(self.ss, self.samplenum, self.out_ann,
[0, ['%d' % self.bit_]])
self.bits.append(self.bit_)
self.handle_bits(self.samplenum)
self.ss = self.samplenum
self.wait({0: 'e'})
self.state = 'BIT FALLING'
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