1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <android-base/macros.h>
20 #include <android/hardware/automotive/can/1.0/types.h>
21 
22 namespace android::hardware::automotive::protocan {
23 
24 /**
25  * TODO(twasilczyk): right now, only Little Endian signals are supported.
26  */
27 class Signal {
28  public:
29   using value = uint64_t;
30 
31   const value maxValue;
32 
33   Signal(uint16_t start, uint8_t length, value defVal = 0);
34 
35   value get(const can::V1_0::CanMessage& msg) const;
36   void set(can::V1_0::CanMessage& msg, value val) const;
37   void setDefault(can::V1_0::CanMessage& msg) const;
38 
39  private:
40   const uint16_t kFirstByte;     ///< Index of first byte that holds the signal
41   const uint8_t kFirstBit;       ///< Index of first bit within first byte
42   const uint8_t kFirstByteBits;  ///< How many bits of the first byte belong to the signal
43   const uint16_t kLastByte;      ///< Index of last byte that holds the signal
44   const uint8_t kLastMask;       ///< Bits of the last byte that belong to the signal
45   const uint8_t kFirstMask;      ///< Bits of the first byte that belong to the signal
46 
47   const value kDefVal;
48 };
49 
50 }  // namespace android::hardware::automotive::protocan
51