![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
temp
Dependencies: mbed SDFileSystem MS5607 ADXL345_I2C FATFileSystem
Diff: mbed/drivers/CAN.h
- Revision:
- 0:c88c3b616c00
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed/drivers/CAN.h Mon Mar 16 23:37:42 2020 +0900 @@ -0,0 +1,262 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * 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. + */ +#ifndef MBED_CAN_H +#define MBED_CAN_H + +#include "platform/platform.h" + +#if DEVICE_CAN + +#include "hal/can_api.h" +#include "platform/Callback.h" +#include "platform/PlatformMutex.h" + +namespace mbed { +/** \addtogroup drivers */ +/** @{*/ + +/** CANMessage class + * + * @Note Synchronization level: Thread safe + */ +class CANMessage : public CAN_Message { + +public: + /** Creates empty CAN message. + */ + CANMessage() : CAN_Message() { + len = 8; + type = CANData; + format = CANStandard; + id = 0; + memset(data, 0, 8); + } + + /** Creates CAN message with specific content. + */ + CANMessage(int _id, const char *_data, char _len = 8, CANType _type = CANData, CANFormat _format = CANStandard) { + len = _len & 0xF; + type = _type; + format = _format; + id = _id; + memcpy(data, _data, _len); + } + + /** Creates CAN remote message. + */ + CANMessage(int _id, CANFormat _format = CANStandard) { + len = 0; + type = CANRemote; + format = _format; + id = _id; + memset(data, 0, 8); + } +}; + +/** A can bus client, used for communicating with can devices + */ +class CAN { + +public: + /** Creates an CAN interface connected to specific pins. + * + * @param rd read from transmitter + * @param td transmit to transmitter + * + * Example: + * @code + * #include "mbed.h" + * + * Ticker ticker; + * DigitalOut led1(LED1); + * DigitalOut led2(LED2); + * CAN can1(p9, p10); + * CAN can2(p30, p29); + * + * char counter = 0; + * + * void send() { + * if(can1.write(CANMessage(1337, &counter, 1))) { + * printf("Message sent: %d\n", counter); + * counter++; + * } + * led1 = !led1; + * } + * + * int main() { + * ticker.attach(&send, 1); + * CANMessage msg; + * while(1) { + * if(can2.read(msg)) { + * printf("Message received: %d\n\n", msg.data[0]); + * led2 = !led2; + * } + * wait(0.2); + * } + * } + * @endcode + */ + CAN(PinName rd, PinName td); + virtual ~CAN(); + + /** Set the frequency of the CAN interface + * + * @param hz The bus frequency in hertz + * + * @returns + * 1 if successful, + * 0 otherwise + */ + int frequency(int hz); + + /** Write a CANMessage to the bus. + * + * @param msg The CANMessage to write. + * + * @returns + * 0 if write failed, + * 1 if write was successful + */ + int write(CANMessage msg); + + /** Read a CANMessage from the bus. + * + * @param msg A CANMessage to read to. + * @param handle message filter handle (0 for any message) + * + * @returns + * 0 if no message arrived, + * 1 if message arrived + */ + int read(CANMessage &msg, int handle = 0); + + /** Reset CAN interface. + * + * To use after error overflow. + */ + void reset(); + + /** Puts or removes the CAN interface into silent monitoring mode + * + * @param silent boolean indicating whether to go into silent mode or not + */ + void monitor(bool silent); + + enum Mode { + Reset = 0, + Normal, + Silent, + LocalTest, + GlobalTest, + SilentTest + }; + + /** Change CAN operation to the specified mode + * + * @param mode The new operation mode (CAN::Normal, CAN::Silent, CAN::LocalTest, CAN::GlobalTest, CAN::SilentTest) + * + * @returns + * 0 if mode change failed or unsupported, + * 1 if mode change was successful + */ + int mode(Mode mode); + + /** Filter out incomming messages + * + * @param id the id to filter on + * @param mask the mask applied to the id + * @param format format to filter on (Default CANAny) + * @param handle message filter handle (Optional) + * + * @returns + * 0 if filter change failed or unsupported, + * new filter handle if successful + */ + int filter(unsigned int id, unsigned int mask, CANFormat format = CANAny, int handle = 0); + + /** Returns number of read errors to detect read overflow errors. + */ + unsigned char rderror(); + + /** Returns number of write errors to detect write overflow errors. + */ + unsigned char tderror(); + + enum IrqType { + RxIrq = 0, + TxIrq, + EwIrq, + DoIrq, + WuIrq, + EpIrq, + AlIrq, + BeIrq, + IdIrq, + + IrqCnt + }; + + /** Attach a function to call whenever a CAN frame received interrupt is + * generated. + * + * @param func A pointer to a void function, or 0 to set as none + * @param event Which CAN interrupt to attach the member function to (CAN::RxIrq for message received, CAN::TxIrq for transmitted or aborted, CAN::EwIrq for error warning, CAN::DoIrq for data overrun, CAN::WuIrq for wake-up, CAN::EpIrq for error passive, CAN::AlIrq for arbitration lost, CAN::BeIrq for bus error) + */ + void attach(Callback<void()> func, IrqType type=RxIrq); + + /** Attach a member function to call whenever a CAN frame received interrupt + * is generated. + * + * @param obj pointer to the object to call the member function on + * @param method pointer to the member function to be called + * @param event Which CAN interrupt to attach the member function to (CAN::RxIrq for message received, TxIrq for transmitted or aborted, EwIrq for error warning, DoIrq for data overrun, WuIrq for wake-up, EpIrq for error passive, AlIrq for arbitration lost, BeIrq for bus error) + */ + template<typename T> + void attach(T* obj, void (T::*method)(), IrqType type=RxIrq) { + // Underlying call thread safe + attach(Callback<void()>(obj, method), type); + } + + /** Attach a member function to call whenever a CAN frame received interrupt + * is generated. + * + * @param obj pointer to the object to call the member function on + * @param method pointer to the member function to be called + * @param event Which CAN interrupt to attach the member function to (CAN::RxIrq for message received, TxIrq for transmitted or aborted, EwIrq for error warning, DoIrq for data overrun, WuIrq for wake-up, EpIrq for error passive, AlIrq for arbitration lost, BeIrq for bus error) + */ + template<typename T> + void attach(T* obj, void (*method)(T*), IrqType type=RxIrq) { + // Underlying call thread safe + attach(Callback<void()>(obj, method), type); + } + + static void _irq_handler(uint32_t id, CanIrqType type); + +protected: + virtual void lock(); + virtual void unlock(); + can_t _can; + Callback<void()> _irq[IrqCnt]; + PlatformMutex _mutex; +}; + +} // namespace mbed + +#endif + +#endif // MBED_CAN_H + +/** @}*/