]>
Commit | Line | Data |
---|---|---|
8892c768 UH |
1 | ## |
2 | ## This file is part of the sigrok project. | |
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 | ||
21 | # | |
22 | # TrekStor EBR30-a I2C demux protocol decoder | |
23 | # | |
24 | # Takes an I2C stream as input and outputs 3 different I2C streams, for the | |
25 | # 3 different I2C devices on the TrekStor EBR30-a eBook reader (which are all | |
26 | # physically connected to the same SCL/SDA lines). | |
27 | # | |
28 | # I2C slave addresses: | |
29 | # | |
30 | # - AXP199 battery management chip: 0x69/0x68 (8bit R/W), 0x34 (7bit) | |
31 | # - H8563S RTC chip: 0xa3/0xa2 (8bit R/W), 0x51 (7bit) | |
32 | # - Unknown accelerometer chip: 0x2b/0x2a (8bit R/W), 0x15 (7bit) | |
33 | # | |
34 | ||
35 | import sigrokdecode as srd | |
36 | ||
37 | # I2C devices | |
38 | AXP199 = 0 | |
39 | H8563S = 1 | |
40 | ACCEL = 2 | |
41 | ||
42 | class Decoder(srd.Decoder): | |
a2c2afd9 | 43 | api_version = 1 |
8892c768 UH |
44 | id = 'ebr30a_i2c_demux' |
45 | name = 'EBR30-a I2C demux' | |
46 | longname = 'TrekStor EBR30-a I2C demux' | |
47 | desc = 'TODO.' | |
48 | longdesc = 'TODO.' | |
8892c768 UH |
49 | license = 'gplv2+' |
50 | inputs = ['i2c'] | |
decde15e | 51 | outputs = ['i2c-axp199', 'i2c-h8563s', 'i2c-accel'] # TODO: type vs. inst. |
8892c768 | 52 | probes = [] |
b77614bc | 53 | optional_probes = [] |
8892c768 UH |
54 | options = {} |
55 | annotations = [] | |
56 | ||
57 | def __init__(self, **kwargs): | |
58 | self.packets = [] | |
59 | self.stream = -1 | |
60 | ||
61 | def start(self, metadata): | |
62 | self.out_proto = [] | |
63 | self.out_proto.append(self.add(srd.OUTPUT_PROTO, 'i2c-axp199')) | |
64 | self.out_proto.append(self.add(srd.OUTPUT_PROTO, 'i2c-h8563s')) | |
65 | self.out_proto.append(self.add(srd.OUTPUT_PROTO, 'i2c-accel')) | |
66 | # TODO: Annotations? | |
67 | ||
68 | def report(self): | |
69 | pass | |
70 | ||
71 | # Grab I2C packets into a local cache, until an I2C STOP condition | |
72 | # packet comes along. At some point before that STOP condition, there | |
73 | # will have been an ADDRESS READ or ADDRESS WRITE which contains the | |
74 | # I2C address of the slave that the master wants to talk to. | |
75 | # We use this slave address to figure out which output stream should | |
76 | # get the whole chunk of packets (from START to STOP). | |
77 | def decode(self, ss, es, data): | |
78 | ||
79 | cmd, databyte, ack_bit = data | |
80 | ||
81 | # Add the I2C packet to our local cache. | |
82 | self.packets += [[ss, es, data]] | |
83 | ||
84 | if cmd in ('ADDRESS READ', 'ADDRESS WRITE'): | |
85 | # print(hex(databyte)) | |
86 | if databyte == 0x34: | |
87 | self.stream = AXP199 | |
88 | elif databyte == 0x51: | |
89 | self.stream = H8563S | |
90 | elif databyte == 0x15: | |
91 | self.stream = ACCEL | |
92 | else: | |
93 | pass # TODO: Error? | |
94 | # TODO: Can there be two ADDRESS READ/WRITE with two different | |
95 | # slave addresses before any STOP occurs? | |
96 | elif cmd == 'STOP': | |
97 | if self.stream != -1: | |
98 | # Send the whole chunk of I2C packets to the correct stream. | |
99 | for p in self.packets: | |
100 | # print(self.out_proto[self.stream], p) | |
101 | self.put(p[0], p[1], self.out_proto[self.stream], p[2]) | |
102 | else: | |
103 | print('Error: Could not determine correct stream!') # FIXME | |
104 | self.packets = [] | |
105 | self.stream = -1 | |
decde15e UH |
106 | else: |
107 | pass # Do nothing, only add the I2C packet to our cache. | |
8892c768 | 108 |