ardupilot/libraries/AP_BoardConfig/AP_BoardConfig_CAN.h

#pragma once

#include <AP_HAL/AP_HAL.h>

#if HAL_WITH_UAVCAN

#include <AP_Param/AP_Param.h>

#ifndef AP_CAN_DEBUG
  #define AP_CAN_DEBUG 0
#endif

class AP_BoardConfig_CAN {
public:
    AP_BoardConfig_CAN();

    /* Do not allow copies */
    AP_BoardConfig_CAN(const AP_BoardConfig_CAN &other) = delete;
    AP_BoardConfig_CAN &operator=(const AP_BoardConfig_CAN&) = delete;

    static AP_BoardConfig_CAN* get_singleton() {
        return _singleton;
    }

    enum Protocol_Type : uint8_t {
        Protocol_Type_None = 0,
        Protocol_Type_UAVCAN = 1,
    };

    void init(void);

    // returns number of active CAN drivers
    uint8_t get_num_drivers(void) { return _num_drivers; }

    // return debug level for interface i
    uint8_t get_debug_level(uint8_t i) {
#if AP_CAN_DEBUG
        if (i < MAX_NUMBER_OF_CAN_INTERFACES) {
            return _interfaces[i]._driver_number_cache ? _interfaces[i]._debug_level : 0;
        }
#endif
        return 0;
    }

    // return maximum level of debug of all interfaces
    uint8_t get_debug_level(void) {
        uint8_t ret = 0;
#if AP_CAN_DEBUG
        for (uint8_t i = 0; i < MAX_NUMBER_OF_CAN_INTERFACES; i++) {
            uint8_t dbg = get_debug_level(i);
            ret = (dbg > ret) ? dbg : ret;
        }
#endif
        return ret;
    }

    // return maximum level of debug for driver index i
    uint8_t get_debug_level_driver(uint8_t i) {
        uint8_t ret = 0;
#if AP_CAN_DEBUG
        for (uint8_t j = 0; j < MAX_NUMBER_OF_CAN_INTERFACES; j++) {
            if (_interfaces[j]._driver_number_cache == i) {
                uint8_t dbg = get_debug_level(j);
                ret = (dbg > ret) ? dbg : ret;
            }
        }
#endif
        return ret;
    }

    // return driver for index i
    AP_HAL::CANProtocol* get_driver(uint8_t i) {
        if (i < MAX_NUMBER_OF_CAN_DRIVERS) {
            return _drivers[i]._driver;
        }
        return nullptr;
    }

    // return protocol type index i
    Protocol_Type get_protocol_type(uint8_t i) {
        if (i < MAX_NUMBER_OF_CAN_DRIVERS) {
            return _drivers[i]._protocol_type_cache;
        }
        return Protocol_Type_None;
    }

    static const struct AP_Param::GroupInfo var_info[];

private:
    class Interface {
        friend class AP_BoardConfig_CAN;

    public:
        Interface() {
            AP_Param::setup_object_defaults(this, var_info);
        }

        static const struct AP_Param::GroupInfo var_info[];

    private:
        AP_Int8 _driver_number;
        uint8_t _driver_number_cache;
        AP_Int32 _bitrate;
#if AP_CAN_DEBUG
        AP_Int8 _debug_level;
#endif
    };

    class Driver {
        friend class AP_BoardConfig_CAN;

    public:
        Driver() {
            AP_Param::setup_object_defaults(this, var_info);
        }

        static const struct AP_Param::GroupInfo var_info[];

    private:
        AP_Int8 _protocol_type;
        Protocol_Type _protocol_type_cache;
        AP_HAL::CANProtocol* _driver;
    };

    Interface _interfaces[MAX_NUMBER_OF_CAN_INTERFACES];
    Driver _drivers[MAX_NUMBER_OF_CAN_DRIVERS];
    uint8_t _num_drivers;

    static AP_BoardConfig_CAN *_singleton;
};

namespace AP {
    AP_BoardConfig_CAN& can();
}
#endif