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d997c01a | 1 | ## |
50bd5d25 | 2 | ## This file is part of the libsigrokdecode project. |
d997c01a UH |
3 | ## |
4 | ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
d997c01a UH |
21 | import sigrokdecode as srd |
22 | ||
17160de7 | 23 | # Definitions of various bits in MXC6225XU registers. |
d997c01a UH |
24 | status = { |
25 | # SH[1:0] | |
26 | 'sh': { | |
17160de7 | 27 | 0b00: 'none', |
d997c01a UH |
28 | 0b01: 'shake left', |
29 | 0b10: 'shake right', | |
30 | 0b11: 'undefined', | |
31 | }, | |
32 | # ORI[1:0] and OR[1:0] (same format) | |
33 | 'ori': { | |
34 | 0b00: 'vertical in upright orientation', | |
35 | 0b01: 'rotated 90 degrees clockwise', | |
36 | 0b10: 'vertical in inverted orientation', | |
37 | 0b11: 'rotated 90 degrees counterclockwise', | |
38 | }, | |
17160de7 UH |
39 | # SHTH[1:0] |
40 | 'shth': { | |
41 | 0b00: '0.5g', | |
42 | 0b01: '1.0g', | |
43 | 0b10: '1.5g', | |
44 | 0b11: '2.0g', | |
45 | }, | |
46 | # SHC[1:0] | |
47 | 'shc': { | |
48 | 0b00: '16', | |
49 | 0b01: '32', | |
50 | 0b10: '64', | |
51 | 0b11: '128', | |
52 | }, | |
53 | # ORC[1:0] | |
54 | 'orc': { | |
55 | 0b00: '16', | |
56 | 0b01: '32', | |
57 | 0b10: '64', | |
58 | 0b11: '128', | |
59 | }, | |
d997c01a UH |
60 | } |
61 | ||
62 | class Decoder(srd.Decoder): | |
63 | api_version = 1 | |
64 | id = 'mxc6225xu' | |
65 | name = 'MXC6225XU' | |
66 | longname = 'MEMSIC MXC6225XU' | |
a465436e | 67 | desc = 'Digital Thermal Orientation Sensor (DTOS) protocol.' |
d997c01a UH |
68 | license = 'gplv2+' |
69 | inputs = ['i2c'] | |
70 | outputs = ['mxc6225xu'] | |
da9bcbd9 BV |
71 | annotations = ( |
72 | ('text', 'Human-readable text'), | |
73 | ) | |
d997c01a UH |
74 | |
75 | def __init__(self, **kwargs): | |
76 | self.state = 'IDLE' | |
77 | ||
8915b346 | 78 | def start(self): |
c515eed7 | 79 | # self.out_python = self.register(srd.OUTPUT_PYTHON) |
be465111 | 80 | self.out_ann = self.register(srd.OUTPUT_ANN) |
d997c01a | 81 | |
d997c01a UH |
82 | def putx(self, data): |
83 | self.put(self.ss, self.es, self.out_ann, data) | |
84 | ||
85 | def handle_reg_0x00(self, b): | |
86 | # XOUT: 8-bit x-axis acceleration output. | |
87 | # Data is in 2's complement, values range from -128 to 127. | |
17160de7 | 88 | self.putx([0, ['XOUT: %d' % b]]) |
d997c01a UH |
89 | |
90 | def handle_reg_0x01(self, b): | |
91 | # YOUT: 8-bit y-axis acceleration output. | |
92 | # Data is in 2's complement, values range from -128 to 127. | |
17160de7 | 93 | self.putx([0, ['YOUT: %d' % b]]) |
d997c01a UH |
94 | |
95 | def handle_reg_0x02(self, b): | |
96 | # STATUS: Orientation and shake status. | |
97 | ||
17160de7 | 98 | # Bits[7:7]: INT |
d997c01a UH |
99 | int_val = (b >> 7) & 1 |
100 | s = 'unchanged and no' if (int_val == 0) else 'changed or' | |
101 | ann = 'INT = %d: Orientation %s shake event occured\n' % (int_val, s) | |
102 | ||
103 | # Bits[6:5]: SH[1:0] | |
104 | sh = (((b >> 6) & 1) << 1) | ((b >> 5) & 1) | |
17160de7 UH |
105 | ann += 'SH[1:0] = %s: Shake event: %s\n' % \ |
106 | (bin(sh)[2:], status['sh'][sh]) | |
d997c01a UH |
107 | |
108 | # Bits[4:4]: TILT | |
17160de7 | 109 | tilt = (b >> 4) & 1 |
d997c01a UH |
110 | s = '' if (tilt == 0) else 'not ' |
111 | ann += 'TILT = %d: Orientation measurement is %svalid\n' % (tilt, s) | |
112 | ||
113 | # Bits[3:2]: ORI[1:0] | |
114 | ori = (((b >> 3) & 1) << 1) | ((b >> 2) & 1) | |
115 | ann += 'ORI[1:0] = %s: %s\n' % (bin(ori)[2:], status['ori'][ori]) | |
116 | ||
117 | # Bits[1:0]: OR[1:0] | |
118 | or_val = (((b >> 1) & 1) << 1) | ((b >> 0) & 1) | |
119 | ann += 'OR[1:0] = %s: %s\n' % (bin(or_val)[2:], status['ori'][or_val]) | |
120 | ||
121 | # ann += 'b = %s\n' % (bin(b)) | |
122 | ||
123 | self.putx([0, [ann]]) | |
124 | ||
125 | def handle_reg_0x03(self, b): | |
126 | # DETECTION: Powerdown, orientation and shake detection parameters. | |
127 | # Note: This is a write-only register. | |
128 | ||
17160de7 | 129 | # Bits[7:7]: PD |
d997c01a | 130 | pd = (b >> 7) & 1 |
17160de7 UH |
131 | s = 'Do not power down' if (pd == 0) else 'Power down' |
132 | ann = 'PD = %d: %s the device (into a low-power state)\n' % (pd, s) | |
d997c01a | 133 | |
17160de7 | 134 | # Bits[6:6]: SHM |
d997c01a | 135 | shm = (b >> 6) & 1 |
17160de7 UH |
136 | ann = 'SHM = %d: Set shake mode to %d\n' % (shm, shm) |
137 | ||
138 | # Bits[5:4]: SHTH[1:0] | |
139 | shth = (((b >> 5) & 1) << 1) | ((b >> 4) & 1) | |
140 | ann += 'SHTH[1:0] = %s: Set shake threshold to %s\n' \ | |
141 | % (bin(shth)[2:], status['shth'][shth]) | |
d997c01a | 142 | |
17160de7 UH |
143 | # Bits[3:2]: SHC[1:0] |
144 | shc = (((b >> 3) & 1) << 1) | ((b >> 2) & 1) | |
145 | ann += 'SHC[1:0] = %s: Set shake count to %s readings\n' \ | |
146 | % (bin(shc)[2:], status['shc'][shc]) | |
147 | ||
148 | # Bits[1:0]: ORC[1:0] | |
149 | orc = (((b >> 1) & 1) << 1) | ((b >> 0) & 1) | |
150 | ann += 'ORC[1:0] = %s: Set orientation count to %s readings\n' \ | |
151 | % (bin(orc)[2:], status['orc'][orc]) | |
152 | ||
153 | self.putx([0, [ann]]) | |
d997c01a UH |
154 | |
155 | # TODO: Fixup, this is copy-pasted from another PD. | |
17160de7 | 156 | # TODO: Handle/check the ACKs/NACKs. |
d997c01a UH |
157 | def decode(self, ss, es, data): |
158 | cmd, databyte = data | |
159 | ||
31f1a296 | 160 | # Store the start/end samples of this I²C packet. |
d997c01a UH |
161 | self.ss, self.es = ss, es |
162 | ||
163 | # State machine. | |
164 | if self.state == 'IDLE': | |
31f1a296 | 165 | # Wait for an I²C START condition. |
d997c01a UH |
166 | if cmd != 'START': |
167 | return | |
168 | self.state = 'GET SLAVE ADDR' | |
169 | self.block_start_sample = ss | |
170 | elif self.state == 'GET SLAVE ADDR': | |
171 | # Wait for an address write operation. | |
17160de7 | 172 | # TODO: We should only handle packets to the slave(?) |
d997c01a UH |
173 | if cmd != 'ADDRESS WRITE': |
174 | return | |
175 | self.state = 'GET REG ADDR' | |
176 | elif self.state == 'GET REG ADDR': | |
177 | # Wait for a data write (master selects the slave register). | |
178 | if cmd != 'DATA WRITE': | |
179 | return | |
180 | self.reg = databyte | |
17160de7 UH |
181 | self.state = 'WRITE REGS' |
182 | elif self.state == 'WRITE REGS': | |
183 | # If we see a Repeated Start here, it's a multi-byte read. | |
d997c01a | 184 | if cmd == 'START REPEAT': |
17160de7 | 185 | self.state = 'READ REGS' |
d997c01a UH |
186 | return |
187 | # Otherwise: Get data bytes until a STOP condition occurs. | |
188 | if cmd == 'DATA WRITE': | |
189 | handle_reg = getattr(self, 'handle_reg_0x%02x' % self.reg) | |
190 | handle_reg(databyte) | |
191 | self.reg += 1 | |
192 | # TODO: Check for NACK! | |
193 | elif cmd == 'STOP': | |
194 | # TODO | |
195 | self.state = 'IDLE' | |
196 | else: | |
197 | pass # TODO | |
17160de7 | 198 | elif self.state == 'READ REGS': |
d997c01a | 199 | # Wait for an address read operation. |
17160de7 | 200 | # TODO: We should only handle packets to the slave(?) |
d997c01a | 201 | if cmd == 'ADDRESS READ': |
17160de7 | 202 | self.state = 'READ REGS2' |
d997c01a UH |
203 | return |
204 | else: | |
205 | pass # TODO | |
17160de7 | 206 | elif self.state == 'READ REGS2': |
d997c01a UH |
207 | if cmd == 'DATA READ': |
208 | handle_reg = getattr(self, 'handle_reg_0x%02x' % self.reg) | |
209 | handle_reg(databyte) | |
210 | self.reg += 1 | |
211 | # TODO: Check for NACK! | |
212 | elif cmd == 'STOP': | |
213 | # TODO | |
214 | self.state = 'IDLE' | |
215 | else: | |
216 | pass # TODO? | |
217 | else: | |
0eeeb544 | 218 | raise Exception('Invalid state: %s' % self.state) |
d997c01a | 219 |