1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author "Romain Forlot" <romain.forlot@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
class Decoder_c
{
private:
openxc_DynamicField decoded_value;
public:
/* Public: Parse the signal's bitfield from the given data and return the raw
* value.
*
* signal - The signal to parse from the data.
* data - The data to parse the signal from.
* length - The length of the data array.
*
* Returns the raw value of the signal parsed as a bitfield from the given byte
* array.
*/
float parseSignalBitfield(CanSignal* signal, const CanMessage* message);
/* Public: Find and return the corresponding string state for a CAN signal's
* raw integer value.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals.
* signalCount - the length of the signals array.
* value - The numerical value that should map to a state.
* send - An output argument that will be set to false if the value should
* not be sent for any reason.
*
* Returns a DynamicField with a string value if a matching state is found in
* the signal. If an equivalent isn't found, send is sent to false and the
* return value is undefined.
*/
openxc_DynamicField stateDecoder(CanSignal* signal, CanSignal* signals,
int signalCount, float value, bool* send);
/* Public: Coerces a numerical value to a boolean.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals
* signalCount - The length of the signals array
* value - The numerical value that will be converted to a boolean.
* send - An output argument that will be set to false if the value should
* not be sent for any reason.
*
* Returns a DynamicField with a boolean value of false if the raw signal value
* is 0.0, otherwise true. The 'send' argument will not be modified as this
* decoder always succeeds.
*/
openxc_DynamicField booleanDecoder(CanSignal* signal, CanSignal* signals,
int signalCount, float value, bool* send);
/* Public: Update the metadata for a signal and the newly received value.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* This function always flips 'send' to false.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals.
* signalCount - The length of the signals array.
* value - The numerical value that will be converted to a boolean.
* send - This output argument will always be set to false, so the caller will
* know not to publish this value to the pipeline.
*
* The return value is undefined.
*/
openxc_DynamicField ignoreDecoder(CanSignal* signal, CanSignal* signals,
int signalCount, float value, bool* send);
/* Public: Wrap a raw CAN signal value in a DynamicField without modification.
*
* This is an implementation of the SignalDecoder type signature, and can be
* used directly in the CanSignal.decoder field.
*
* signal - The details of the signal that contains the state mapping.
* signals - The list of all signals
* signalCount - The length of the signals array
* value - The numerical value that will be wrapped in a DynamicField.
* send - An output argument that will be set to false if the value should
* not be sent for any reason.
*
* Returns a DynamicField with the original, unmodified raw CAN signal value as
* its numeric value. The 'send' argument will not be modified as this decoder
* always succeeds.
*/
openxc_DynamicField noopDecoder(CanSignal* signal, CanSignal* signals,
int signalCount, float value, bool* send);
/* Public: Parse a signal from a CAN message and apply any required
* transforations to get a human readable value.
*
* If the CanSignal has a non-NULL 'decoder' field, the raw CAN signal value
* will be passed to the decoder before returning.
*
* signal - The details of the signal to decode and forward.
* message - The CAN message that contains the signal.
* signals - an array of all active signals.
* signalCount - The length of the signals array.
* send - An output parameter that will be flipped to false if the value could
* not be decoded.
*
* The decoder returns an openxc_DynamicField, which may contain a number,
* string or boolean. If 'send' is false, the return value is undefined.
*/
openxc_DynamicField decodeSignal(CanSignal* signal,
const CanMessage* message, CanSignal* signals, int signalCount,
bool* send);
/* Public: Decode a transformed, human readable value from an raw CAN signal
* already parsed from a CAN message.
*
* This is the same as decodeSignal(CanSignal*, CanMessage*, CanSignal*, int,
* bool*) but you must parse the bitfield value of the signal from the CAN
* message yourself. This is useful if you need that raw value for something
* else.
*/
openxc_DynamicField decodeSignal(CanSignal* signal, float value,
CanSignal* signals, int signalCount, bool* send);
}
|
