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Diff: mbed/CAN.h
- Revision:
- 17:d1594579eec6
- Parent:
- 0:ad97421fb1fb
diff -r 7321fb3bb396 -r d1594579eec6 mbed/CAN.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed/CAN.h Fri May 19 17:14:07 2017 +0000 @@ -0,0 +1,252 @@ +/* mbed Microcontroller Library - can + * Copyright (c) 2009-2011 ARM Limited. All rights reserved. + */ + +#ifndef MBED_CAN_H +#define MBED_CAN_H + +#include "device.h" + +#if DEVICE_CAN + +#include "Base.h" +#include "platform.h" +#include "PinNames.h" +#include "PeripheralNames.h" + +#include "can_helper.h" +#include "FunctionPointer.h" + +#include <string.h> + +namespace mbed { + +/* Class: CANMessage + * + */ +class CANMessage : public CAN_Message { + +public: + + /* Constructor: CANMessage + * Creates empty CAN message. + */ + CANMessage() { + len = 8; + type = CANData; + format = CANStandard; + id = 0; + memset(data, 0, 8); + } + + /* Constructor: CANMessage + * 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); + } + + /* Constructor: CANMessage + * Creates CAN remote message. + */ + CANMessage(int _id, CANFormat _format = CANStandard) { + len = 0; + type = CANRemote; + format = _format; + id = _id; + memset(data, 0, 8); + } +#if 0 // Inhereted from CAN_Message, for documentation only + + /* Variable: id + * The message id. + * + * If format is CANStandard it must be an 11 bit long id + * If format is CANExtended it must be an 29 bit long id + */ + unsigned int id; + + /* Variable: data + * Space for 8 byte payload. + * + * If type is CANData data can store up to 8 byte data. + */ + unsigned char data[8]; + + /* Variable: len + * Length of data in bytes. + * + * If type is CANData data can store up to 8 byte data. + */ + unsigned char len; + + /* Variable: format + * Defines if the message has standard or extended format. + * + * Defines the type of message id: + * Default is CANStandard which implies 11 bit id. + * CANExtended means 29 bit message id. + */ + CANFormat format; + + /* Variable: type + * Defines the type of a message. + * + * The message type can rather be CANData for a message with data (default). + * Or CANRemote for a request of a specific CAN message. + */ + CANType type; // 0 - DATA FRAME, 1 - REMOTE FRAME +#endif +}; + +/* Class: CAN + * A can bus client, used for communicating with can devices + */ +class CAN : public Base { + +public: + + /* Constructor: CAN + * Creates an CAN interface connected to specific pins. + * + * Example: + * > #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); + * > } + * > } + * + * Variables: + * rd - read from transmitter + * td - transmit to transmitter + */ + CAN(PinName rd, PinName td); + virtual ~CAN(); + + /* Function: frequency + * Set the frequency of the CAN interface + * + * Variables: + * hz - The bus frequency in hertz + * returns - 1 if successful, 0 otherwise + */ + int frequency(int hz); + + /* Function: write + * Write a CANMessage to the bus. + * + * Variables: + * msg - The CANMessage to write. + * + * Returns: + * 0 - If write failed. + * 1 - If write was successful. + */ + int write(CANMessage msg); + + /* Function: read + * Read a CANMessage from the bus. + * + * Variables: + * msg - A CANMessage to read to. + * + * Returns: + * 0 - If no message arrived. + * 1 - If message arrived. + */ + int read(CANMessage &msg); + + /* Function: reset + * Reset CAN interface. + * + * To use after error overflow. + */ + void reset(); + + /* Function: monitor + * Puts or removes the CAN interface into silent monitoring mode + * + * Variables: + * silent - boolean indicating whether to go into silent mode or not + */ + void monitor(bool silent); + + /* Function: rderror + * Returns number of read errors to detect read overflow errors. + */ + unsigned char rderror(); + + /* Function: tderror + * Returns number of write errors to detect write overflow errors. + */ + unsigned char tderror(); + + /* Function: attach + * Attach a function to call whenever a CAN frame received interrupt is + * generated. + * + * Variables: + * fptr - A pointer to a void function, or 0 to set as none + */ + void attach(void (*fptr)(void)); + + /* Function attach + * Attach a member function to call whenever a CAN frame received interrupt + * is generated. + * + * Variables: + * tptr - pointer to the object to call the member function on + * mptr - pointer to the member function to be called + */ + template<typename T> + void attach(T* tptr, void (T::*mptr)(void)) { + if((mptr != NULL) && (tptr != NULL)) { + _rxirq.attach(tptr, mptr); + setup_interrupt(); + } else { + remove_interrupt(); + } + } + +private: + + CANName _id; + FunctionPointer _rxirq; + + void setup_interrupt(void); + void remove_interrupt(void); +}; + +} // namespace mbed + +#endif // MBED_CAN_H + +#endif