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120 lines
4.0 KiB
Python
Executable File
120 lines
4.0 KiB
Python
Executable File
##
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## This file is part of the libsigrokdecode project.
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##
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## Copyright (C) 2016 Vladimir Ermakov <vooon341@gmail.com>
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## Copyright (C) 2019 DreamSourceLab <support@dreamsourcelab.com>
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 3 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, see <http://www.gnu.org/licenses/>.
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##
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import sigrokdecode as srd
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from functools import reduce
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class SamplerateError(Exception):
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pass
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class Decoder(srd.Decoder):
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api_version = 3
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id = 'rgb_led_ws281x'
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name = 'RGB LED (WS281x)'
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longname = 'RGB LED string decoder (WS281x)'
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desc = 'RGB LED string protocol (WS281x).'
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license = 'gplv3+'
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inputs = ['logic']
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outputs = []
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tags = ['Display', 'IC']
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channels = (
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{'id': 'din', 'name': 'DIN', 'desc': 'DIN data line'},
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)
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annotations = (
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('bit', 'Bit'),
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('reset', 'RESET'),
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('rgb', 'RGB'),
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)
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annotation_rows = (
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('bit', 'Bits', (0, 1)),
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('rgb', 'RGB', (2,)),
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)
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def __init__(self):
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self.reset()
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def reset(self):
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self.state = 'FIND RESET'
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self.samplerate = None
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self.ss_packet = None
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self.ss = None
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self.es = None
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self.bits = []
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def start(self):
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self.out_ann = self.register(srd.OUTPUT_ANN)
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def metadata(self, key, value):
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if key == srd.SRD_CONF_SAMPLERATE:
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self.samplerate = value
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def handle_bits(self, samplenum):
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if len(self.bits) == 24:
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grb = reduce(lambda a, b: (a << 1) | b, self.bits)
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rgb = (grb & 0xff0000) >> 8 | (grb & 0x00ff00) << 8 | (grb & 0x0000ff)
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self.put(self.ss_packet, samplenum, self.out_ann,
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[2, ['#%06x' % rgb]])
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self.bits = []
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self.ss_packet = samplenum
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def decode(self):
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if not self.samplerate:
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raise SamplerateError('Cannot decode without samplerate.')
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while True:
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if self.state == 'FIND RESET':
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self.wait({0: 'f'})
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self.ss = self.samplenum
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self.wait({0: 'r'})
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self.es = self.samplenum
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if ((self.es - self.ss) / self.samplerate > 50e-6):
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self.state = 'RESET'
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elif self.state == 'RESET':
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self.put(self.ss, self.es, self.out_ann, [1, ['RESET', 'RST', 'R']])
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self.bits = []
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self.ss = self.samplenum
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self.ss_packet = self.samplenum
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self.wait({0: 'f'})
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self.state = 'BIT FALLING'
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elif self.state == 'BIT FALLING':
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self.es = self.samplenum
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self.wait({0: 'r'})
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if ((self.es - self.ss) / self.samplerate > 50e-6):
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self.ss = self.es
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self.es = self.samplenum
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self.state = 'RESET'
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else:
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self.state = 'BIT RISING'
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elif self.state == 'BIT RISING':
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period = self.samplenum - self.ss
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duty = self.es - self.ss
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# Ideal duty for T0H: 33%, T1H: 66%.
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bit_ = (duty / period) > 0.5
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self.put(self.ss, self.samplenum, self.out_ann,
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[0, ['%d' % bit_]])
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self.bits.append(bit_)
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self.handle_bits(self.samplenum)
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self.ss = self.samplenum
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self.wait({0: 'f'})
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self.state = 'BIT FALLING'
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