Called max7219 rather than max72xx because there's a whole other series of max723x chips that are unrelated. --- decoders/max7219/__init__.py | 26 +++++++++++ decoders/max7219/pd.py | 109 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 135 insertions(+) create mode 100644 decoders/max7219/__init__.py create mode 100644 decoders/max7219/pd.py
diff --git a/decoders/max7219/__init__.py b/decoders/max7219/__init__.py
new file mode 100644
index 0000000..ad56f0c
--- /dev/null
+++ b/decoders/max7219/__init__.py
@@ -0,0 +1,26 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2015 Paul Evans <leon...@leonerd.org.uk>
+##
+## 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, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+'''
+This decoder stacks on top of the 'spi' PD and decodes the Maxim MAX7219 and
+MAX7221 LED matrix driver registers.
+'''
+
+from .pd import Decoder
diff --git a/decoders/max7219/pd.py b/decoders/max7219/pd.py
new file mode 100644
index 0000000..c8c997e
--- /dev/null
+++ b/decoders/max7219/pd.py
@@ -0,0 +1,109 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2015 Paul Evans <leon...@leonerd.org.uk>
+##
+## 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, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+import re
+import sigrokdecode as srd
+
+def _decode_intensity(val):
+ intensity = val & 0x0f
+ if intensity == 0:
+ return 'min'
+ elif intensity == 15:
+ return 'max'
+ else:
+ return intensity
+
+registers = {
+ 0x00: ['No-op', lambda _: ''],
+ 0x09: ['Decode', lambda v: '0b{:08b}'.format(v)],
+ 0x0A: ['Intensity', _decode_intensity],
+ 0x0B: ['Scan limit', lambda v: 1 + v],
+ 0x0C: ['Shutdown', lambda v: 'off' if v else 'on'],
+ 0x0F: ['Display test', lambda v: 'on' if v else 'off']
+}
+
+class Decoder(srd.Decoder):
+ api_version = 2
+ id = 'max7219'
+ name = 'MAX7219'
+ longname = 'Maxim MAX7219/MAX7221'
+ desc = '8-Digit LED Display Driver'
+ license = 'gplv2+'
+ inputs = ['spi']
+ outputs = ['max7219']
+ annotations = (
+ ('register', 'Registers written to the device'),
+ ('digit', 'Digits displayed on the device'),
+ ('warnings', 'Human-readable warnings'),
+ )
+ ann_reg = 0
+ ann_digit = 1
+ ann_warning = 2
+ annotation_rows = (
+ ('commands', 'Commands', (ann_reg, ann_digit)),
+ ('warnings', 'Warnings', (ann_warning,)),
+ )
+
+ def start(self):
+ self.out_ann = self.register(srd.OUTPUT_ANN)
+ self.pos = 0
+ self.cs_start = 0
+
+ def putreg(self, ss, es, reg, value):
+ self.put(ss, es, self.out_ann, [self.ann_reg, ['%s: %s' % (reg,
value)]])
+
+ def putdigit(self, ss, es, digit, value):
+ self.put(ss, es, self.out_ann, [self.ann_digit, ['Digit %d: %02X' %
(digit, value)]])
+
+ def putwarn(self, ss, es, message):
+ self.put(ss, es, self.out_ann, [self.ann_warning, [message]])
+
+ def decode(self, ss, es, data):
+ ptype, mosi, _ = data
+
+ if ptype == 'DATA':
+ if not self.cs_asserted:
+ return
+
+ if self.pos == 0:
+ self.addr = mosi
+ self.addr_start = ss
+ elif self.pos == 1:
+ if self.addr >= 1 and self.addr <= 8:
+ self.putdigit(self.addr_start, es, self.addr, mosi)
+ elif self.addr in registers:
+ name, decoder = registers[self.addr]
+ self.putreg(self.addr_start, es, name, decoder(mosi))
+ else:
+ self.putwarn(self.addr_start, es, 'Unknown register %02X'
% (self.addr))
+
+ self.pos += 1
+ elif ptype == 'CS-CHANGE':
+ self.cs_asserted = mosi
+ if self.cs_asserted:
+ self.pos = 0
+ self.cs_start = ss
+ else:
+ if self.pos == 1:
+ # Don't warn if pos=0 so that CS glitches don't appear as
+ # spurious warnings
+ self.putwarn(self.cs_start, es, 'Short write')
+ elif self.pos > 2:
+ self.putwarn(self.cs_start, es, 'Overlong write')
--
2.6.1
--
Paul "LeoNerd" Evans
leon...@leonerd.org.uk
http://www.leonerd.org.uk/ | https://metacpan.org/author/PEVANS
pgpO1S9ZfCg49.pgp
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