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c40477de SP |
1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2018 Stefan Petersen <spe@ciellt.se> | |
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, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | import re | |
21 | import sigrokdecode as srd | |
22 | ||
23 | registers = { | |
15a60d37 UH |
24 | 0x80: ['WRDS', 0, lambda _: ''], |
25 | 0x81: ['STO', 1, lambda _: ''], | |
26 | 0x82: ['SLEEP', 2, lambda _: ''], | |
27 | 0x83: ['WRITE', 3, lambda v: '0x%x' % v], | |
28 | 0x84: ['WREN', 4, lambda _: ''], | |
29 | 0x85: ['RCL', 5, lambda _: ''], | |
30 | 0x86: ['READ', 6, lambda v: '0x%x' % v], | |
31 | 0x87: ['READ', 7, lambda v: '0x%x' % v], | |
c40477de SP |
32 | } |
33 | ||
c40477de SP |
34 | class Decoder(srd.Decoder): |
35 | api_version = 3 | |
36 | id = 'x2444m' | |
37 | name = 'X2444M/P' | |
38 | longname = 'Xicor X2444M/P' | |
39 | desc = 'Xicor X2444M/P nonvolatile static RAM protocol.' | |
40 | license = 'gplv2+' | |
41 | inputs = ['spi'] | |
42 | outputs = ['x2444m'] | |
43 | annotations = ( | |
15a60d37 UH |
44 | ('wrds', 'Write disable'), |
45 | ('sto', 'Store RAM data in EEPROM'), | |
46 | ('sleep', 'Enter sleep mode'), | |
47 | ('write', 'Write data into RAM'), | |
48 | ('wren', 'Write enable'), | |
49 | ('rcl', 'Recall EEPROM data into RAM'), | |
50 | ('read', 'Data read from RAM'), | |
51 | ('read', 'Data read from RAM'), | |
c40477de SP |
52 | ) |
53 | ||
54 | def __init__(self): | |
55 | self.reset() | |
56 | ||
57 | def reset(self): | |
c40477de SP |
58 | self.cs_start = 0 |
59 | self.cs_asserted = False | |
60 | self.cmd_digit = 0 | |
61 | ||
e7a4360d UH |
62 | def start(self): |
63 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
64 | ||
15a60d37 | 65 | def putreadwrite(self, ss, es, reg, idx, addr, value): |
c40477de | 66 | self.put(ss, es, self.out_ann, |
15a60d37 | 67 | [idx, ['%s: %s => 0x%4.4x' % (reg, addr, value)]]) |
c40477de | 68 | |
15a60d37 UH |
69 | def putcmd(self, ss, es, reg, idx): |
70 | self.put(ss, es, self.out_ann, [idx, ['%s' % reg]]) | |
c40477de SP |
71 | |
72 | def decode(self, ss, es, data): | |
73 | ptype, mosi, miso = data | |
74 | ||
75 | if ptype == 'DATA': | |
76 | if not self.cs_asserted: | |
77 | return | |
78 | ||
79 | if self.cmd_digit == 0: | |
80 | self.addr = mosi | |
81 | self.addr_start = ss | |
82 | elif self.cmd_digit > 0: | |
83 | self.read_value = (self.read_value << 8) + miso | |
84 | self.write_value = (self.write_value << 8) + mosi | |
85 | self.cmd_digit += 1 | |
86 | elif ptype == 'CS-CHANGE': | |
87 | self.cs_asserted = (miso == 1) | |
88 | # When not asserted, CS has just changed from asserted to deasserted. | |
89 | if not self.cs_asserted: | |
90 | # Only one digit, simple command. Else read/write. | |
91 | if self.cmd_digit == 1: | |
15a60d37 UH |
92 | name, idx, decoder = registers[self.addr & 0x87] |
93 | self.putcmd(self.addr_start, es, name, idx) | |
c40477de | 94 | elif self.cmd_digit > 1: |
15a60d37 | 95 | name, idx, decoder = registers[self.addr & 0x87] |
c40477de SP |
96 | if name == 'READ': |
97 | value = self.read_value | |
98 | elif name == 'WRITE': | |
99 | value = self.write_value | |
100 | else: | |
101 | value = 0 | |
15a60d37 | 102 | self.putreadwrite(self.addr_start, es, name, idx, |
c40477de SP |
103 | decoder((self.addr >> 3) & 0x0f), value) |
104 | ||
105 | if self.cs_asserted: | |
106 | self.cs_start = ss | |
107 | self.cmd_digit = 0 | |
108 | self.read_value = 0 | |
109 | self.write_value = 0 |