mirror of https://github.com/ArduPilot/ardupilot
131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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CANSensor class, for easy creation of CAN sensors using custom CAN protocols
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*/
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#pragma once
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#include "AP_CAN.h"
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#include "AP_CANDriver.h"
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#ifndef HAL_BUILD_AP_PERIPH
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#include "AP_CANManager.h"
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#endif
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#if HAL_MAX_CAN_PROTOCOL_DRIVERS
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class CANSensor : public AP_CANDriver {
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public:
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CANSensor(const char *driver_name, uint16_t stack_size=2048);
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/* Do not allow copies */
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CLASS_NO_COPY(CANSensor);
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void init(uint8_t driver_index, bool enable_filters) override;
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bool add_interface(AP_HAL::CANIface* can_iface) override;
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// handler for incoming frames
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virtual void handle_frame(AP_HAL::CANFrame &frame) = 0;
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// handler for outgoing frames
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bool write_frame(AP_HAL::CANFrame &out_frame, const uint64_t timeout_us);
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#ifdef HAL_BUILD_AP_PERIPH
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static void set_periph(const uint8_t i, const AP_CAN::Protocol protocol, AP_HAL::CANIface* iface) {
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if (i < ARRAY_SIZE(_periph)) {
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_periph[i].protocol = protocol;
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_periph[i].iface = iface;
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}
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}
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// return driver type index i
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static AP_CAN::Protocol get_driver_type(const uint8_t i)
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{
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if (i < ARRAY_SIZE(_periph)) {
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return _periph[i].protocol;
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}
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return AP_CAN::Protocol::None;
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}
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#else
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static AP_CAN::Protocol get_driver_type(const uint8_t i) { return AP::can().get_driver_type(i); }
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#endif
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protected:
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void register_driver(AP_CAN::Protocol dtype);
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private:
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void loop();
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const char *const _driver_name;
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const uint16_t _stack_size;
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bool _initialized;
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uint8_t _driver_index;
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// this is true when we are setup as an auxillary driver using CAN_Dn_PROTOCOL2
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bool is_aux_11bit_driver;
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AP_CANDriver *_can_driver;
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HAL_BinarySemaphore sem_handle;
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AP_HAL::CANIface* _can_iface;
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#ifdef HAL_BUILD_AP_PERIPH
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void register_driver_periph(const AP_CAN::Protocol dtype);
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struct CANSensor_Periph {
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AP_HAL::CANIface* iface;
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AP_CAN::Protocol protocol;
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} static _periph[HAL_NUM_CAN_IFACES];
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#endif
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};
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// a class to allow for multiple CAN backends with one
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// CANSensor driver. This can be shared among different libraries like rangefinder and proximity
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class MultiCAN : public CANSensor {
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public:
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// callback functor def for forwarding frames
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FUNCTOR_TYPEDEF(ForwardCanFrame, bool, AP_HAL::CANFrame &);
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MultiCAN(ForwardCanFrame cf, AP_CAN::Protocol can_type, const char *driver_name);
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// handle a received frame from the CAN bus
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void handle_frame(AP_HAL::CANFrame &frame) override;
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private:
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// class to allow for multiple callbacks implemented as a linked list
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class MultiCANLinkedList {
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public:
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struct CANSensor_Multi {
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ForwardCanFrame _callback;
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CANSensor_Multi* next = nullptr;
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};
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// register a callback for a CAN frame by adding it to the linked list
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void register_callback(ForwardCanFrame callback);
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// distribute the CAN frame to the registered callbacks
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void handle_frame(AP_HAL::CANFrame &frame);
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HAL_Semaphore sem;
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private:
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CANSensor_Multi* head = nullptr;
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};
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// Pointer to static instance of the linked list for persistence across instances
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static MultiCANLinkedList* callbacks;
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};
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#endif // HAL_MAX_CAN_PROTOCOL_DRIVERS
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