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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2014 Matt Ranostay <mranostay@gmail.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 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_RGB, ) = range(1)
class Decoder(srd.Decoder):
api_version = 3
id = 'rgb_led_spi'
name = 'RGB LED (SPI)'
longname = 'RGB LED string decoder (SPI)'
desc = 'RGB LED string protocol (RGB values clocked over SPI).'
license = 'gplv2+'
inputs = ['spi']
outputs = []
tags = ['Display']
annotations = (
('rgb', 'RGB value'),
)
def __init__(self):
self.reset()
def reset(self):
self.ss_cmd = None
self.mosi_bytes = []
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
def putg(self, ss, es, cls, text):
self.put(ss, es, self.out_ann, [cls, text])
def decode(self, ss, es, data):
ptype = data[0]
# Grab the payload of three DATA packets. These hold the
# RGB values (in this very order).
if ptype != 'DATA':
return
_, mosi, _ = data
if not self.mosi_bytes:
self.ss_cmd = ss
self.mosi_bytes.append(mosi)
if len(self.mosi_bytes) < 3:
return
# Emit annotations. Invalidate accumulated details as soon as
# they were processed, to prepare the next iteration.
ss_cmd, es_cmd = self.ss_cmd, es
self.ss_cmd = None
red, green, blue = self.mosi_bytes[:3]
self.mosi_bytes.clear()
rgb_value = int(red) << 16 | int(green) << 8 | int(blue)
self.putg(ss_cmd, es_cmd, ANN_RGB, ['#{:06x}'.format(rgb_value)])
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