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/*
* 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
#include <vector>
#include <string>
#include <cstdint>
#include <linux/can.h>
#include "timer.hpp"
#define CAN_MESSAGE_SIZE 8
/**
* @enum CanMessageFormat
* @brief The ID format for a CAN message.
*/
enum CanMessageFormat {
STANDARD, /*!< STANDARD - standard 11-bit CAN arbitration ID. */
EXTENDED, /*!< EXTENDED - an extended frame, with a 29-bit arbitration ID. */
ERROR, /*!< ERROR - ERROR code used at initialization to signify that it isn't usable'*/
};
typedef enum CanMessageFormat CanMessageFormat;
/**
* @class can_message_t
*
* @brief A compact representation of a single CAN message, meant to be used in in/out
* buffers.
*/
/*************************
* old CanMessage struct *
*************************
struct CanMessage {
uint32_t id;
CanMessageFormat format;
uint8_t data[CAN_MESSAGE_SIZE];
uint8_t length;
};
typedef struct CanMessage CanMessage;
*/
class can_message_t {
private:
uint32_t id_; /*!< uint32_t id - The ID of the message. */
bool rtr_flag_; /*!< bool rtr_flag - Telling if the frame has RTR flag positionned. Then frame hasn't data field*/
uint8_t length_; /*!< uint8_t length - the length of the data array (max 8). */
uint8_t flags_; /*!< unint8_t flags of a CAN FD frame. Needed if we catch FD frames.*/
CanMessageFormat format_; /*!< CanMessageFormat format - the format of the message's ID.*/
std::vector<uint8_t> data_; /*!< uint8_t data - The message's data field with a size of 8 which is the standard about CAN bus messages.*/
uint8_t maxdlen_;
public:
/**
* @brief Class constructor
*
* Constructor about can_message_t class.
*/
can_message_t();
/**
* @brief Retrieve id_ member value.
*
* @return uint32_t id_ class member
*/
uint32_t get_id() const;
/**
* @brief Retrieve RTR flag member.
*
* @return bool rtr_flags_ class member
*/
bool get_rtr_flag_() const;
/**
* @brief Retrieve format_ member value.
*
* @return CanMessageFormat format_ class member
*/
int get_format() const;
/**
* @brief Retrieve format_ member value.
*
* @return CanMessageFormat format_ class member
*/
uint8_t get_flags() const;
/**
* @brief Retrieve data_ member value.
*
* @return uint8_t data_ pointer to the first element
* of class member data_
*/
const uint8_t* get_data() const;
/**
* @brief Retrieve length_ member value.
*
* @return uint8_t length_ class member
*/
uint8_t get_length() const;
void set_max_data_length(size_t nbytes);
/**
* @brief Control whether the object is correctly initialized
* to be sent over the CAN bus
*
* @return true if object correctly initialized and false if not...
*/
bool is_correct_to_send();
/**
* @brief Set id_ member value.
*
* Preferred way to initialize these members by using
* convert_from_canfd_frame method.
*
* @param uint32_t id_ class member
*/
void set_id_and_format(const uint32_t new_id);
/**
* @brief Set format_ member value.
*
* Preferred way to initialize these members by using
* convert_from_canfd_frame method.
*
* @param CanMessageFormat format_ class member
*/
void set_format(const CanMessageFormat new_format);
/**
* @brief Set format_ member value. Deducing from the can_id
* of a canfd_frame.
*
* Preferred way to initialize these members by using
* convert_from_canfd_frame method.
*
* @param uint32_t can_id integer from a canfd_frame
*/
void set_format(const uint32_t can_id);
/**
* @brief Set format_ member value.
*
* Preferred way to initialize these members by using
* convert_from_canfd_frame method.
*
* @param CanMessageFormat format_ class member
*/
void set_flags(const uint8_t flags);
/**
* @brief Set data_ member value.
*
* Preferred way to initialize these members by using
* convert_from_canfd_frame method.
*
* @param uint8_t data_ array with a max size of 8 elements.
*/
void set_data(const __u8* new_data);
/**
* @brief Set length_ member value.
*
* Preferred way to initialize these members by using
* convert_from_canfd_frame method.
*
* @param uint8_t length_ array with a max size of 8 elements.
*/
void set_length(const uint8_t new_length);
/**
* @brief Take a canfd_frame struct to initialize class members
*
* This is the preferred way to initialize class members.
*
* @param canfd_frame struct read from can bus device.
*/
void convert_from_canfd_frame(const std::pair<struct canfd_frame&, size_t>args);
/**
* @brief Take all initialized class's members and build an
* canfd_frame struct that can be use to send a CAN message over
* the bus.
*
* @return canfd_frame struct built from class members.
*/
canfd_frame convert_to_canfd_frame();
};
/**
* @struct CanMessageDefinition
*
* @brief The definition of a CAN message. This includes a lot of metadata, so
* to save memory this struct should not be used for storing incoming and
* outgoing CAN messages.
*/
struct CanMessageDefinition {
//can_bus_dev_t bus; /*!< bus - A pointer to the bus this message is on. */
uint32_t id; /*!< id - The ID of the message.*/
CanMessageFormat format; /*!< format - the format of the message's ID.*/
FrequencyClock frequencyClock; /*!< clock - an optional frequency clock to control the output of this
* message, if sent raw, or simply to mark the max frequency for custom
* handlers to retriec++ if ? syntaxve.*/
bool forceSendChanged; /*!< forceSendChanged - If true, regardless of the frequency, it will send CAN
* message if it has changed when using raw passthrough.*/
uint8_t lastValue[CAN_MESSAGE_SIZE]; /*!< lastValue - The last received value of the message. Defaults to undefined.
* This is required for the forceSendChanged functionality, as the stack
* needs to compare an incoming CAN message with the previous frame.*/
};
typedef struct CanMessageDefinition CanMessageDefinition;
/**
* @struct CanMessageSet
*
* @brief A parent wrapper for a particular set of CAN messages and associated
* CAN buses(e.g. a vehicle or program).
*/
typedef struct {
uint8_t index; /*!<index - A numerical ID for the message set, ideally the index in an array
* for fast lookup*/
const std::string name; /*!< name - The name of the message set.*/
uint8_t busCount; /*!< busCount - The number of CAN buses defined for this message set.*/
unsigned short messageCount; /*!< messageCount - The number of CAN messages (across all buses) defined for
* this message set.*/
unsigned short signalCount; /*!< signalCount - The number of CAN signals (across all messages) defined for
* this message set.*/
unsigned short commandCount; /*!< commandCount - The number of CanCommmands defined for this message set.*/
} CanMessageSet;
/** Public: Return the currently active CAN configuration. */
CanMessageSet* getActiveMessageSet();
/** Public: Retrive a list of all possible CAN configurations.
*
* Returns a pointer to an array of all configurations.
*/
CanMessageSet* getMessageSets();
/** Public: Return the length of the array returned by getMessageSets() */
int getMessageSetCount();
/* Public: Return an array of all CAN messages to be processed in the active
* configuration.
*/
CanMessageDefinition* getMessages();
/* Public: Return the length of the array returned by getMessages(). */
int getMessageCount();
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