mirror of
https://github.com/DreamSourceLab/DSView.git
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116 lines
3.7 KiB
Python
Executable File
116 lines
3.7 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) 2015 Paul Evans <leonerd@leonerd.org.uk>
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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 2 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 re
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import sigrokdecode as srd
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def _decode_intensity(val):
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intensity = val & 0x0f
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if intensity == 0:
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return 'min'
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elif intensity == 15:
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return 'max'
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else:
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return intensity
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registers = {
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0x00: ['No-op', lambda _: ''],
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0x09: ['Decode', lambda v: '0b{:08b}'.format(v)],
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0x0A: ['Intensity', _decode_intensity],
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0x0B: ['Scan limit', lambda v: 1 + v],
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0x0C: ['Shutdown', lambda v: 'off' if v else 'on'],
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0x0F: ['Display test', lambda v: 'on' if v else 'off']
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}
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ann_reg, ann_digit, ann_warning = range(3)
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class Decoder(srd.Decoder):
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api_version = 3
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id = 'max7219'
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name = 'MAX7219'
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longname = 'Maxim MAX7219/MAX7221'
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desc = 'Maxim MAX72xx series 8-digit LED display driver.'
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license = 'gplv2+'
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inputs = ['spi']
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outputs = []
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tags = ['Display']
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annotations = (
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('register', 'Registers written to the device'),
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('digit', 'Digits displayed on the device'),
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('warnings', 'Human-readable warnings'),
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)
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annotation_rows = (
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('commands', 'Commands', (ann_reg, ann_digit)),
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('warnings', 'Warnings', (ann_warning,)),
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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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pass
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def start(self):
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self.out_ann = self.register(srd.OUTPUT_ANN)
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self.pos = 0
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self.cs_start = 0
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def putreg(self, ss, es, reg, value):
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self.put(ss, es, self.out_ann, [ann_reg, ['%s: %s' % (reg, value)]])
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def putdigit(self, ss, es, digit, value):
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self.put(ss, es, self.out_ann, [ann_digit, ['Digit %d: %02X' % (digit, value)]])
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def putwarn(self, ss, es, message):
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self.put(ss, es, self.out_ann, [ann_warning, [message]])
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def decode(self, ss, es, data):
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ptype, mosi, _ = data
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if ptype == 'DATA':
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if not self.cs_asserted:
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return
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if self.pos == 0:
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self.addr = mosi
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self.addr_start = ss
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elif self.pos == 1:
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if self.addr >= 1 and self.addr <= 8:
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self.putdigit(self.addr_start, es, self.addr, mosi)
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elif self.addr in registers:
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name, decoder = registers[self.addr]
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self.putreg(self.addr_start, es, name, decoder(mosi))
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else:
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self.putwarn(self.addr_start, es,
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'Unknown register %02X' % (self.addr))
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self.pos += 1
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elif ptype == 'CS-CHANGE':
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self.cs_asserted = mosi
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if self.cs_asserted:
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self.pos = 0
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self.cs_start = ss
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else:
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if self.pos == 1:
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# Don't warn if pos=0 so that CS# glitches don't appear
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# as spurious warnings.
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self.putwarn(self.cs_start, es, 'Short write')
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elif self.pos > 2:
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self.putwarn(self.cs_start, es, 'Overlong write')
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