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6eb87578 | 1 | ## |
50bd5d25 | 2 | ## This file is part of the libsigrokdecode project. |
6eb87578 GM |
3 | ## |
4 | ## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz> | |
12549f11 | 5 | ## Copyright (C) 2012-2014 Uwe Hermann <uwe@hermann-uwe.de> |
6eb87578 GM |
6 | ## |
7 | ## This program is free software; you can redistribute it and/or modify | |
8 | ## it under the terms of the GNU General Public License as published by | |
9 | ## the Free Software Foundation; either version 2 of the License, or | |
10 | ## (at your option) any later version. | |
11 | ## | |
12 | ## This program is distributed in the hope that it will be useful, | |
13 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ## GNU General Public License for more details. | |
16 | ## | |
17 | ## You should have received a copy of the GNU General Public License | |
18 | ## along with this program; if not, write to the Free Software | |
19 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | ## | |
ad2dc0de | 21 | |
677d597b | 22 | import sigrokdecode as srd |
67e847fd | 23 | |
0702e0cf | 24 | ''' |
c515eed7 | 25 | OUTPUT_PYTHON format: |
0702e0cf | 26 | |
bf69977d UH |
27 | Packet: |
28 | [<ptype>, <data1>, <data2>] | |
0702e0cf | 29 | |
bf69977d | 30 | <ptype>: |
34929ee0 | 31 | - 'DATA': <data1> contains the MOSI data, <data2> contains the MISO data. |
0702e0cf | 32 | The data is _usually_ 8 bits (but can also be fewer or more bits). |
12549f11 | 33 | Both data items are Python numbers (not strings), or None if the respective |
6a15597a | 34 | channel was not supplied. |
34929ee0 | 35 | - 'BITS': <data1>/<data2> contain a list of bit values in this MOSI/MISO data |
cddd11bc | 36 | item, and for each of those also their respective start-/endsample numbers. |
0702e0cf | 37 | - 'CS CHANGE': <data1> is the old CS# pin value, <data2> is the new value. |
1c49e875 | 38 | Both data items are Python numbers (0/1), not strings. At the beginning of |
8a110ab1 JS |
39 | the decoding a packet is generated with <data1> = None and <data2> being the |
40 | initial state of the CS# pin or None if the chip select pin is not supplied. | |
0702e0cf UH |
41 | |
42 | Examples: | |
8a110ab1 | 43 | ['CS-CHANGE', None, 1] |
0702e0cf UH |
44 | ['CS-CHANGE', 1, 0] |
45 | ['DATA', 0xff, 0x3a] | |
cddd11bc UH |
46 | ['BITS', [[1, 80, 82], [1, 83, 84], [1, 85, 86], [1, 87, 88], |
47 | [1, 89, 90], [1, 91, 92], [1, 93, 94], [1, 95, 96]], | |
d78e0beb UH |
48 | [[0, 80, 82], [1, 83, 84], [0, 85, 86], [1, 87, 88], |
49 | [1, 89, 90], [1, 91, 92], [0, 93, 94], [0, 95, 96]]] | |
0702e0cf | 50 | ['DATA', 0x65, 0x00] |
12549f11 UH |
51 | ['DATA', 0xa8, None] |
52 | ['DATA', None, 0x55] | |
0702e0cf UH |
53 | ['CS-CHANGE', 0, 1] |
54 | ''' | |
55 | ||
8a7ce2a3 | 56 | # Key: (CPOL, CPHA). Value: SPI mode. |
94bbdb9a UH |
57 | # Clock polarity (CPOL) = 0/1: Clock is low/high when inactive. |
58 | # Clock phase (CPHA) = 0/1: Data is valid on the leading/trailing clock edge. | |
c94c8c91 UH |
59 | spi_mode = { |
60 | (0, 0): 0, # Mode 0 | |
61 | (0, 1): 1, # Mode 1 | |
62 | (1, 0): 2, # Mode 2 | |
63 | (1, 1): 3, # Mode 3 | |
64 | } | |
65 | ||
37b0da68 BV |
66 | class SamplerateError(Exception): |
67 | pass | |
68 | ||
f04964c6 | 69 | class ChannelError(Exception): |
37b0da68 BV |
70 | pass |
71 | ||
677d597b | 72 | class Decoder(srd.Decoder): |
12851357 | 73 | api_version = 2 |
67e847fd | 74 | id = 'spi' |
2b7d0e2b | 75 | name = 'SPI' |
3d3da57d | 76 | longname = 'Serial Peripheral Interface' |
a465436e | 77 | desc = 'Full-duplex, synchronous, serial bus.' |
6eb87578 GM |
78 | license = 'gplv2+' |
79 | inputs = ['logic'] | |
80 | outputs = ['spi'] | |
6a15597a | 81 | channels = ( |
49e8a4d6 | 82 | {'id': 'clk', 'name': 'CLK', 'desc': 'Clock'}, |
da9bcbd9 | 83 | ) |
6a15597a | 84 | optional_channels = ( |
49e8a4d6 UH |
85 | {'id': 'miso', 'name': 'MISO', 'desc': 'Master in, slave out'}, |
86 | {'id': 'mosi', 'name': 'MOSI', 'desc': 'Master out, slave in'}, | |
87 | {'id': 'cs', 'name': 'CS#', 'desc': 'Chip-select'}, | |
da9bcbd9 | 88 | ) |
84c1c0b5 BV |
89 | options = ( |
90 | {'id': 'cs_polarity', 'desc': 'CS# polarity', 'default': 'active-low', | |
91 | 'values': ('active-low', 'active-high')}, | |
92 | {'id': 'cpol', 'desc': 'Clock polarity', 'default': 0, | |
93 | 'values': (0, 1)}, | |
94 | {'id': 'cpha', 'desc': 'Clock phase', 'default': 0, | |
95 | 'values': (0, 1)}, | |
b0918d40 | 96 | {'id': 'bitorder', 'desc': 'Bit order', |
84c1c0b5 | 97 | 'default': 'msb-first', 'values': ('msb-first', 'lsb-first')}, |
b0918d40 | 98 | {'id': 'wordsize', 'desc': 'Word size', 'default': 8}, |
84c1c0b5 | 99 | ) |
da9bcbd9 BV |
100 | annotations = ( |
101 | ('miso-data', 'MISO data'), | |
102 | ('mosi-data', 'MOSI data'), | |
103 | ('miso-bits', 'MISO bits'), | |
104 | ('mosi-bits', 'MOSI bits'), | |
105 | ('warnings', 'Human-readable warnings'), | |
106 | ) | |
06b52ebb | 107 | annotation_rows = ( |
cddd11bc UH |
108 | ('miso-data', 'MISO data', (0,)), |
109 | ('miso-bits', 'MISO bits', (2,)), | |
110 | ('mosi-data', 'MOSI data', (1,)), | |
111 | ('mosi-bits', 'MOSI bits', (3,)), | |
112 | ('other', 'Other', (4,)), | |
06b52ebb | 113 | ) |
49d0e05c UH |
114 | binary = ( |
115 | ('miso', 'MISO'), | |
116 | ('mosi', 'MOSI'), | |
117 | ) | |
6eb87578 | 118 | |
3643fc3f | 119 | def __init__(self): |
8a3c8792 | 120 | self.samplerate = None |
bcd14870 | 121 | self.oldclk = 1 |
a10bfc48 | 122 | self.bitcount = 0 |
bbc100f7 | 123 | self.misodata = self.mosidata = 0 |
cddd11bc | 124 | self.misobits = [] |
bbc100f7 | 125 | self.mosibits = [] |
486b19ce | 126 | self.ss_block = -1 |
d6bace96 | 127 | self.samplenum = -1 |
bb08f4b3 | 128 | self.cs_was_deasserted = False |
8a110ab1 | 129 | self.oldcs = None |
2fcd7c22 | 130 | self.oldpins = None |
bbc100f7 | 131 | self.have_cs = self.have_miso = self.have_mosi = None |
1c49e875 | 132 | self.no_cs_notification = False |
6eb87578 | 133 | |
8a3c8792 BV |
134 | def metadata(self, key, value): |
135 | if key == srd.SRD_CONF_SAMPLERATE: | |
136 | self.samplerate = value | |
137 | ||
8915b346 | 138 | def start(self): |
c515eed7 | 139 | self.out_python = self.register(srd.OUTPUT_PYTHON) |
be465111 | 140 | self.out_ann = self.register(srd.OUTPUT_ANN) |
49d0e05c | 141 | self.out_bin = self.register(srd.OUTPUT_BINARY) |
8a3c8792 BV |
142 | self.out_bitrate = self.register(srd.OUTPUT_META, |
143 | meta=(int, 'Bitrate', 'Bitrate during transfers')) | |
3643fc3f | 144 | |
ec0afe27 | 145 | def putw(self, data): |
486b19ce | 146 | self.put(self.ss_block, self.samplenum, self.out_ann, data) |
ec0afe27 | 147 | |
bbc100f7 UH |
148 | def putdata(self): |
149 | # Pass MISO and MOSI bits and then data to the next PD up the stack. | |
150 | so = self.misodata if self.have_miso else None | |
151 | si = self.mosidata if self.have_mosi else None | |
152 | so_bits = self.misobits if self.have_miso else None | |
153 | si_bits = self.mosibits if self.have_mosi else None | |
7c09dbb2 UH |
154 | |
155 | if self.have_miso: | |
156 | ss, es = self.misobits[-1][1], self.misobits[0][2] | |
49d0e05c | 157 | self.put(ss, es, self.out_bin, (0, bytes([so]))) |
7c09dbb2 UH |
158 | if self.have_mosi: |
159 | ss, es = self.mosibits[-1][1], self.mosibits[0][2] | |
49d0e05c | 160 | self.put(ss, es, self.out_bin, (1, bytes([si]))) |
7c09dbb2 UH |
161 | |
162 | self.put(ss, es, self.out_python, ['BITS', si_bits, so_bits]) | |
163 | self.put(ss, es, self.out_python, ['DATA', si, so]) | |
cddd11bc | 164 | |
bbc100f7 UH |
165 | # Bit annotations. |
166 | if self.have_miso: | |
167 | for bit in self.misobits: | |
168 | self.put(bit[1], bit[2], self.out_ann, [2, ['%d' % bit[0]]]) | |
169 | if self.have_mosi: | |
170 | for bit in self.mosibits: | |
171 | self.put(bit[1], bit[2], self.out_ann, [3, ['%d' % bit[0]]]) | |
172 | ||
173 | # Dataword annotations. | |
174 | if self.have_miso: | |
808c6e74 | 175 | self.put(ss, es, self.out_ann, [0, ['%02X' % self.misodata]]) |
bbc100f7 | 176 | if self.have_mosi: |
808c6e74 | 177 | self.put(ss, es, self.out_ann, [1, ['%02X' % self.mosidata]]) |
cddd11bc | 178 | |
d482a2d3 UH |
179 | def reset_decoder_state(self): |
180 | self.misodata = 0 if self.have_miso else None | |
181 | self.mosidata = 0 if self.have_mosi else None | |
182 | self.misobits = [] if self.have_miso else None | |
183 | self.mosibits = [] if self.have_mosi else None | |
184 | self.bitcount = 0 | |
185 | ||
cdceaa94 AS |
186 | def cs_asserted(self, cs): |
187 | active_low = (self.options['cs_polarity'] == 'active-low') | |
188 | return (cs == 0) if active_low else (cs == 1) | |
189 | ||
bcd14870 | 190 | def handle_bit(self, miso, mosi, clk, cs): |
cddd11bc | 191 | # If this is the first bit of a dataword, save its sample number. |
191ec8c5 | 192 | if self.bitcount == 0: |
486b19ce | 193 | self.ss_block = self.samplenum |
cdceaa94 AS |
194 | self.cs_was_deasserted = \ |
195 | not self.cs_asserted(cs) if self.have_cs else False | |
2fcd7c22 | 196 | |
191ec8c5 | 197 | ws = self.options['wordsize'] |
d6bace96 | 198 | |
bbc100f7 UH |
199 | # Receive MISO bit into our shift register. |
200 | if self.have_miso: | |
201 | if self.options['bitorder'] == 'msb-first': | |
202 | self.misodata |= miso << (ws - 1 - self.bitcount) | |
203 | else: | |
204 | self.misodata |= miso << self.bitcount | |
205 | ||
191ec8c5 | 206 | # Receive MOSI bit into our shift register. |
12549f11 UH |
207 | if self.have_mosi: |
208 | if self.options['bitorder'] == 'msb-first': | |
209 | self.mosidata |= mosi << (ws - 1 - self.bitcount) | |
210 | else: | |
211 | self.mosidata |= mosi << self.bitcount | |
3e3c0330 | 212 | |
808c6e74 | 213 | # Guesstimate the endsample for this bit (can be overridden below). |
bbc100f7 UH |
214 | es = self.samplenum |
215 | if self.bitcount > 0: | |
8e8096e8 UH |
216 | if self.have_miso: |
217 | es += self.samplenum - self.misobits[0][1] | |
218 | elif self.have_mosi: | |
219 | es += self.samplenum - self.mosibits[0][1] | |
c94c8c91 | 220 | |
cddd11bc | 221 | if self.have_miso: |
d78e0beb | 222 | self.misobits.insert(0, [miso, self.samplenum, es]) |
cddd11bc | 223 | if self.have_mosi: |
d78e0beb | 224 | self.mosibits.insert(0, [mosi, self.samplenum, es]) |
bbc100f7 UH |
225 | |
226 | if self.bitcount > 0 and self.have_miso: | |
d78e0beb | 227 | self.misobits[1][2] = self.samplenum |
bbc100f7 | 228 | if self.bitcount > 0 and self.have_mosi: |
d78e0beb | 229 | self.mosibits[1][2] = self.samplenum |
cddd11bc | 230 | |
191ec8c5 | 231 | self.bitcount += 1 |
1ea831e9 | 232 | |
191ec8c5 UH |
233 | # Continue to receive if not enough bits were received, yet. |
234 | if self.bitcount != ws: | |
235 | return | |
b1bb5eed | 236 | |
bbc100f7 | 237 | self.putdata() |
12549f11 UH |
238 | |
239 | # Meta bitrate. | |
bbc100f7 | 240 | elapsed = 1 / float(self.samplerate) |
486b19ce | 241 | elapsed *= (self.samplenum - self.ss_block + 1) |
8a3c8792 | 242 | bitrate = int(1 / elapsed * self.options['wordsize']) |
486b19ce | 243 | self.put(self.ss_block, self.samplenum, self.out_bitrate, bitrate) |
8a3c8792 | 244 | |
bb08f4b3 | 245 | if self.have_cs and self.cs_was_deasserted: |
cddd11bc | 246 | self.putw([4, ['CS# was deasserted during this data word!']]) |
191ec8c5 | 247 | |
d482a2d3 | 248 | self.reset_decoder_state() |
191ec8c5 | 249 | |
bcd14870 | 250 | def find_clk_edge(self, miso, mosi, clk, cs): |
efa64173 | 251 | if self.have_cs and self.oldcs != cs: |
191ec8c5 | 252 | # Send all CS# pin value changes. |
c515eed7 | 253 | self.put(self.samplenum, self.samplenum, self.out_python, |
191ec8c5 UH |
254 | ['CS-CHANGE', self.oldcs, cs]) |
255 | self.oldcs = cs | |
efa64173 | 256 | # Reset decoder state when CS# changes (and the CS# pin is used). |
d482a2d3 | 257 | self.reset_decoder_state() |
191ec8c5 | 258 | |
cdceaa94 AS |
259 | # We only care about samples if CS# is asserted. |
260 | if self.have_cs and not self.cs_asserted(cs): | |
261 | return | |
262 | ||
191ec8c5 | 263 | # Ignore sample if the clock pin hasn't changed. |
bcd14870 | 264 | if clk == self.oldclk: |
191ec8c5 | 265 | return |
b1bb5eed | 266 | |
bcd14870 | 267 | self.oldclk = clk |
b1bb5eed | 268 | |
191ec8c5 UH |
269 | # Sample data on rising/falling clock edge (depends on mode). |
270 | mode = spi_mode[self.options['cpol'], self.options['cpha']] | |
bcd14870 | 271 | if mode == 0 and clk == 0: # Sample on rising clock edge |
191ec8c5 | 272 | return |
bcd14870 | 273 | elif mode == 1 and clk == 1: # Sample on falling clock edge |
191ec8c5 | 274 | return |
bcd14870 | 275 | elif mode == 2 and clk == 1: # Sample on falling clock edge |
191ec8c5 | 276 | return |
bcd14870 | 277 | elif mode == 3 and clk == 0: # Sample on rising clock edge |
191ec8c5 UH |
278 | return |
279 | ||
280 | # Found the correct clock edge, now get the SPI bit(s). | |
bcd14870 | 281 | self.handle_bit(miso, mosi, clk, cs) |
191ec8c5 UH |
282 | |
283 | def decode(self, ss, es, data): | |
37b0da68 | 284 | if not self.samplerate: |
21cda951 | 285 | raise SamplerateError('Cannot decode without samplerate.') |
12549f11 | 286 | # Either MISO or MOSI can be omitted (but not both). CS# is optional. |
191ec8c5 | 287 | for (self.samplenum, pins) in data: |
01329e88 | 288 | |
191ec8c5 UH |
289 | # Ignore identical samples early on (for performance reasons). |
290 | if self.oldpins == pins: | |
291 | continue | |
bcd14870 | 292 | self.oldpins, (clk, miso, mosi, cs) = pins, pins |
12549f11 UH |
293 | self.have_miso = (miso in (0, 1)) |
294 | self.have_mosi = (mosi in (0, 1)) | |
efa64173 | 295 | self.have_cs = (cs in (0, 1)) |
b1bb5eed | 296 | |
9ed11500 UH |
297 | # Either MISO or MOSI (but not both) can be omitted. |
298 | if not (self.have_miso or self.have_mosi): | |
f04964c6 | 299 | raise ChannelError('Either MISO or MOSI (or both) pins required.') |
9ed11500 | 300 | |
1c49e875 JS |
301 | # Tell stacked decoders that we don't have a CS# signal. |
302 | if not self.no_cs_notification and not self.have_cs: | |
8a110ab1 | 303 | self.put(0, 0, self.out_python, ['CS-CHANGE', None, None]) |
1c49e875 JS |
304 | self.no_cs_notification = True |
305 | ||
4fecc5a4 | 306 | self.find_clk_edge(miso, mosi, clk, cs) |