+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2015 Paul Evans <leonerd@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, see <http://www.gnu.org/licenses/>.
+##
+
+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']
+}
+
+ann_chip, ann_reg, ann_digit, ann_warning = range(4)
+
+class Decoder(srd.Decoder):
+ api_version = 3
+ id = 'max72xx'
+ name = 'MAX72xx'
+ longname = 'Maxim MAX7219/MAX7221'
+ desc = 'Maxim MAX72xx series 8-digit LED display driver'
+ license = 'gplv2+'
+ inputs = ['spi']
+ outputs = []
+ tags = ['Display']
+ options = (
+ {'id': 'numofdrivers', 'desc': 'Number of daisy-chained chips', 'default': 1},
+ )
+ annotations = (
+ ('chip', 'Index of chip in daisy chain'),
+ ('register', 'Registers written to the device'),
+ ('digit', 'Digits displayed on the device'),
+ ('warning', 'Human-readable warnings'),
+ )
+ annotation_rows = (
+ ('chip_nr', 'Chip number', (ann_chip,)),
+ ('commands', 'Commands', (ann_reg, ann_digit)),
+ ('warnings', 'Warnings', (ann_warning,)),
+ )
+
+ def __init__(self):
+ self.reset()
+
+ def reset(self):
+ pass
+
+ def start(self):
+ self.out_ann = self.register(srd.OUTPUT_ANN)
+ self.pos = 0
+ self.cs_start = 0
+ self.num_of_drivers = self.options['numofdrivers']
+
+ def putchip(self, ss, es, chip):
+ self.put(ss, es, self.out_ann, [ann_chip, ['Chip %d' % (chip)]])
+
+ def putreg(self, ss, es, reg, value):
+ if value:
+ self.put(ss, es, self.out_ann, [ann_reg, ['%s: %s' % (reg, value)]])
+ else:
+ self.put(ss, es, self.out_ann, [ann_reg, [reg]])
+
+ def putdigit(self, ss, es, digit, value):
+ self.put(ss, es, self.out_ann, [ann_digit, ['Digit %d: %02X' % (digit, value)]])
+
+ def putwarn(self, ss, es, message):
+ self.put(ss, es, self.out_ann, [ann_warning, [message]])
+
+ def decode(self, ss, es, data):
+ ptype, mosi, _ = data
+
+ if ptype == 'DATA':
+ if not self.cs_asserted:
+ return
+
+ if self.pos <= self.num_of_drivers * 2:
+ if self.pos % 2 == 0:
+ self.addr = mosi
+ self.addr_start = ss
+ elif self.pos % 2 == 1:
+ if self.num_of_drivers > 1:
+ self.putchip(self.addr_start, es, (self.pos // 2) + 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 > 0 and self.pos < 2 * self.num_of_drivers:
+ # Don't warn if pos=0 so that CS# glitches don't appear
+ # as spurious warnings.
+ self.putwarn(self.cs_start, es, 'Not enough bits sent for current number of chips')
+ elif self.pos > 2 * self.num_of_drivers:
+ self.putwarn(self.cs_start, es, 'Too many bits sent for current number of chips')
projects / libsigrokdecode.git / commitdiff