diff options
| -rw-r--r-- | decoders/x2444m/__init__.py | 25 | ||||
| -rw-r--r-- | decoders/x2444m/pd.py | 109 |
2 files changed, 134 insertions, 0 deletions
diff --git a/decoders/x2444m/__init__.py b/decoders/x2444m/__init__.py new file mode 100644 index 0000000..70d2146 --- /dev/null +++ b/decoders/x2444m/__init__.py @@ -0,0 +1,25 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2018 Stefan Petersen <spe@ciellt.se> +## +## 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/>. +## + +''' +This decoder stacks on top of the 'spi' PD and decodes the Xicor X2444M/P +nonvolatile static RAM protocol. +''' + +from .pd import Decoder diff --git a/decoders/x2444m/pd.py b/decoders/x2444m/pd.py new file mode 100644 index 0000000..e061d62 --- /dev/null +++ b/decoders/x2444m/pd.py @@ -0,0 +1,109 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2018 Stefan Petersen <spe@ciellt.se> +## +## 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 + +registers = { + 0x80: ['WRDS', lambda _: ''], + 0x81: ['STO', lambda _: ''], + 0x82: ['SLEEP', lambda _: ''], + 0x83: ['WRITE', lambda v: '0x%x' % v], + 0x84: ['WREN', lambda _: ''], + 0x85: ['RCL', lambda _: ''], + 0x86: ['READ', lambda v: '0x%x' % v], + 0x87: ['READ', lambda v: '0x%x' % v], +} + +ann_write, ann_read = range(2) + +class Decoder(srd.Decoder): + api_version = 3 + id = 'x2444m' + name = 'X2444M/P' + longname = 'Xicor X2444M/P' + desc = 'Xicor X2444M/P nonvolatile static RAM protocol.' + license = 'gplv2+' + inputs = ['spi'] + outputs = ['x2444m'] + annotations = ( + ('write', 'Commands and data written to the device'), + ('read', 'Data read from the device'), + ) + annotation_rows = ( + ('data', 'Data', (ann_write, ann_read)), + ) + + def __init__(self): + self.reset() + + def reset(self): + pass + + def start(self): + self.out_ann = self.register(srd.OUTPUT_ANN) + self.cs_start = 0 + self.cs_asserted = False + self.cmd_digit = 0 + + def putreadwrite(self, ss, es, reg, addr, value): + self.put(ss, es, self.out_ann, + [ann_write, ['%s: %s => 0x%4.4x' % (reg, addr, value)]]) + + def putcmd(self, ss, es, reg): + self.put(ss, es, self.out_ann, [ann_write, ['%s' % reg]]) + + def decode(self, ss, es, data): + ptype, mosi, miso = data + + if ptype == 'DATA': + if not self.cs_asserted: + return + + if self.cmd_digit == 0: + self.addr = mosi + self.addr_start = ss + elif self.cmd_digit > 0: + self.read_value = (self.read_value << 8) + miso + self.write_value = (self.write_value << 8) + mosi + self.cmd_digit += 1 + elif ptype == 'CS-CHANGE': + self.cs_asserted = (miso == 1) + # When not asserted, CS has just changed from asserted to deasserted. + if not self.cs_asserted: + # Only one digit, simple command. Else read/write. + if self.cmd_digit == 1: + name, decoder = registers[self.addr & 0x87] + self.putcmd(self.addr_start, es, name) + elif self.cmd_digit > 1: + name, decoder = registers[self.addr & 0x87] + if name == 'READ': + value = self.read_value + elif name == 'WRITE': + value = self.write_value + else: + value = 0 + self.putreadwrite(self.addr_start, es, name, + decoder((self.addr >> 3) & 0x0f), value) + + if self.cs_asserted: + self.cs_start = ss + self.cmd_digit = 0 + self.read_value = 0 + self.write_value = 0 |