--- /dev/null
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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
+##
+
+'''
+MEMSIC MXC6225XU protocol decoder.
+
+The MEMSIC MXC6225XU is a Digital Thermal Orientation Sensor (DTOS).
+
+The chip's I2C interface supports standard mode and fast mode (max. 400kHz).
+Its I2C slave address is 0x2a.
+
+Details:
+TODO
+'''
+
+from .mxc6225xu import *
+
--- /dev/null
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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
+##
+
+# MEMSIC MXC6225XU protocol decoder
+
+import sigrokdecode as srd
+
+# ...
+status = {
+ # SH[1:0]
+ 'sh': {
+ 0b00: 'no shake event',
+ 0b01: 'shake left',
+ 0b10: 'shake right',
+ 0b11: 'undefined',
+ },
+ # ORI[1:0] and OR[1:0] (same format)
+ 'ori': {
+ 0b00: 'vertical in upright orientation',
+ 0b01: 'rotated 90 degrees clockwise',
+ 0b10: 'vertical in inverted orientation',
+ 0b11: 'rotated 90 degrees counterclockwise',
+ },
+}
+
+class Decoder(srd.Decoder):
+ api_version = 1
+ id = 'mxc6225xu'
+ name = 'MXC6225XU'
+ longname = 'MEMSIC MXC6225XU'
+ desc = 'Digital Thermal Orientation Sensor (DTOS) protocol'
+ license = 'gplv2+'
+ inputs = ['i2c']
+ outputs = ['mxc6225xu']
+ probes = []
+ optional_probes = [
+ {'id': 'int', 'name': 'INT', 'desc': 'DTOS interrupt output pin'},
+ ]
+ options = {}
+ annotations = [
+ ['TODO', 'TODO'],
+ ]
+
+ def __init__(self, **kwargs):
+ self.state = 'IDLE'
+
+ def start(self, metadata):
+ # self.out_proto = self.add(srd.OUTPUT_PROTO, 'mxc6225xu')
+ self.out_ann = self.add(srd.OUTPUT_ANN, 'mxc6225xu')
+
+ def report(self):
+ pass
+
+ def putx(self, data):
+ self.put(self.ss, self.es, self.out_ann, data)
+
+ def handle_reg_0x00(self, b):
+ # XOUT: 8-bit x-axis acceleration output.
+ # Data is in 2's complement, values range from -128 to 127.
+ self.putx([0, ['XOUT: ' + str(b)]])
+
+ def handle_reg_0x01(self, b):
+ # YOUT: 8-bit y-axis acceleration output.
+ # Data is in 2's complement, values range from -128 to 127.
+ self.putx([0, ['YOUT: ' + str(b)]])
+
+ def handle_reg_0x02(self, b):
+ # STATUS: Orientation and shake status.
+
+ # Bits [7:7]: INT
+ int_val = (b >> 7) & 1
+ s = 'unchanged and no' if (int_val == 0) else 'changed or'
+ ann = 'INT = %d: Orientation %s shake event occured\n' % (int_val, s)
+
+ # Bits[6:5]: SH[1:0]
+ sh = (((b >> 6) & 1) << 1) | ((b >> 5) & 1)
+ ann += 'SH[1:0] = %s: %s\n' % (bin(sh)[2:], status['sh'][sh])
+
+ # Bits[4:4]: TILT
+ tilt = (b >> 7) & 1
+ s = '' if (tilt == 0) else 'not '
+ ann += 'TILT = %d: Orientation measurement is %svalid\n' % (tilt, s)
+
+ # Bits[3:2]: ORI[1:0]
+ ori = (((b >> 3) & 1) << 1) | ((b >> 2) & 1)
+ ann += 'ORI[1:0] = %s: %s\n' % (bin(ori)[2:], status['ori'][ori])
+
+ # Bits[1:0]: OR[1:0]
+ or_val = (((b >> 1) & 1) << 1) | ((b >> 0) & 1)
+ ann += 'OR[1:0] = %s: %s\n' % (bin(or_val)[2:], status['ori'][or_val])
+
+ # ann += 'b = %s\n' % (bin(b))
+
+ self.putx([0, [ann]])
+
+ def handle_reg_0x03(self, b):
+ # DETECTION: Powerdown, orientation and shake detection parameters.
+ # Note: This is a write-only register.
+
+ # Bits [7:7]: PD
+ pd = (b >> 7) & 1
+ s = 'Do not power down' if (int_val == 0) else 'Power down'
+ ann = 'PD = %d: %s the device\n' % (pd, s)
+
+ # Bits [6:6]: SHM
+ shm = (b >> 6) & 1
+ s = 'TODO' if (shm == 0) else 'TODO'
+ ann = 'SHM = %d: %s\n' % (pd, s)
+
+ # TODO
+ # self.putx([0, ['TODO: DETECTION']])
+
+ # TODO: Fixup, this is copy-pasted from another PD.
+ def decode(self, ss, es, data):
+ cmd, databyte = data
+
+ # Store the start/end samples of this I2C packet.
+ self.ss, self.es = ss, es
+
+ # State machine.
+ if self.state == 'IDLE':
+ # Wait for an I2C START condition.
+ if cmd != 'START':
+ return
+ self.state = 'GET SLAVE ADDR'
+ self.block_start_sample = ss
+ elif self.state == 'GET SLAVE ADDR':
+ # Wait for an address write operation.
+ # TODO: We should only handle packets to the slave (0x2a/TODO).
+ if cmd != 'ADDRESS WRITE':
+ return
+ self.state = 'GET REG ADDR'
+ elif self.state == 'GET REG ADDR':
+ # Wait for a data write (master selects the slave register).
+ if cmd != 'DATA WRITE':
+ return
+ self.reg = databyte
+ self.state = 'WRITE RTC REGS'
+ elif self.state == 'WRITE RTC REGS':
+ # If we see a Repeated Start here, it's probably an RTC read.
+ if cmd == 'START REPEAT':
+ self.state = 'READ RTC REGS'
+ return
+ # Otherwise: Get data bytes until a STOP condition occurs.
+ if cmd == 'DATA WRITE':
+ handle_reg = getattr(self, 'handle_reg_0x%02x' % self.reg)
+ handle_reg(databyte)
+ self.reg += 1
+ # TODO: Check for NACK!
+ elif cmd == 'STOP':
+ # TODO
+ self.state = 'IDLE'
+ else:
+ pass # TODO
+ elif self.state == 'READ RTC REGS':
+ # Wait for an address read operation.
+ # TODO: We should only handle packets to the RTC slave (0xa2/0xa3).
+ if cmd == 'ADDRESS READ':
+ self.state = 'READ RTC REGS2'
+ return
+ else:
+ pass # TODO
+ elif self.state == 'READ RTC REGS2':
+ if cmd == 'DATA READ':
+ handle_reg = getattr(self, 'handle_reg_0x%02x' % self.reg)
+ handle_reg(databyte)
+ self.reg += 1
+ # TODO: Check for NACK!
+ elif cmd == 'STOP':
+ # TODO
+ self.state = 'IDLE'
+ else:
+ pass # TODO?
+ else:
+ raise Exception('Invalid state: %d' % self.state)
+
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