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mcp_can.h
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mcp_can.h
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/*
mcp_can.h
2012 Copyright (c) Seeed Technology Inc. All right reserved.
Author:Loovee (loovee@seeed.cc)
2014-1-16
Contributor:
Cory J. Fowler
Latonita
Woodward1
Mehtajaghvi
BykeBlast
TheRo0T
Tsipizic
ralfEdmund
Nathancheek
BlueAndi
Adlerweb
Btetz
Hurvajs
ttlappalainen
The MIT License (MIT)
Copyright (c) 2013 Seeed Technology Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef _MCP2515_H_
#define _MCP2515_H_
#include "mcp_can_dfs.h"
#define MAX_CHAR_IN_MESSAGE 8
class MCP_CAN
{
private:
byte ext_flg; // identifier xxxID
// either extended (the 29 LSB) or standard (the 11 LSB)
unsigned long can_id; // can id
byte rtr; // rtr
byte SPICS;
SPIClass *pSPI;
byte nReservedTx; // Count of tx buffers for reserved send
/*
* mcp2515 driver function
*/
private:
void mcp2515_reset(void); // reset mcp2515
byte mcp2515_readRegister(const byte address); // read mcp2515's register
void mcp2515_readRegisterS(const byte address,
byte values[],
const byte n);
void mcp2515_setRegister(const byte address, // set mcp2515's register
const byte value);
void mcp2515_setRegisterS(const byte address, // set mcp2515's registers
const byte values[],
const byte n);
void mcp2515_initCANBuffers(void);
void mcp2515_modifyRegister(const byte address, // set bit of one register
const byte mask,
const byte data);
byte mcp2515_readStatus(void); // read mcp2515's Status
byte mcp2515_setCANCTRL_Mode(const byte newmode); // set mode
byte mcp2515_configRate(const byte canSpeed, const byte clock); // set baudrate
byte mcp2515_init(const byte canSpeed, const byte clock); // mcp2515init
void mcp2515_write_id( const byte mcp_addr, // write can id
const byte ext,
const unsigned long id );
void mcp2515_read_id( const byte mcp_addr, // read can id
byte* ext,
unsigned long* id );
void mcp2515_write_canMsg( const byte buffer_sidh_addr, unsigned long id, byte ext, byte rtr, byte len, volatile const byte *buf); // read can msg
void mcp2515_read_canMsg( const byte buffer_load_addr, volatile unsigned long *id, volatile byte *ext, volatile byte *rtr, volatile byte *len, volatile byte *buf); // write can msg
void mcp2515_start_transmit(const byte mcp_addr); // start transmit
byte mcp2515_getNextFreeTXBuf(byte *txbuf_n); // get Next free txbuf
byte mcp2515_isTXBufFree(byte *txbuf_n, byte iBuf); // is buffer by index free
/*
* can operator function
*/
byte sendMsg(unsigned long id, byte ext, byte rtrBit, byte len, const byte *buf, bool wait_sent=true); // send message
public:
MCP_CAN(byte _CS=0);
void init_CS(byte _CS); // define CS after construction before begin()
void setSPI(SPIClass *_pSPI) { pSPI=_pSPI; } // define SPI port to use before begin()
void enableTxInterrupt(bool enable=true); // enable transmit interrupt
void reserveTxBuffers(byte nTxBuf=0) { nReservedTx=(nTxBuf<MCP_N_TXBUFFERS?nTxBuf:MCP_N_TXBUFFERS-1); }
byte getLastTxBuffer() { return MCP_N_TXBUFFERS-1; } // read index of last tx buffer
byte begin(byte speedset, const byte clockset = MCP_16MHz); // init can
byte init_Mask(byte num, byte ext, unsigned long ulData); // init Masks
byte init_Filt(byte num, byte ext, unsigned long ulData); // init filters
byte sendMsgBuf(unsigned long id, byte ext, byte rtrBit, byte len, const byte *buf, bool wait_sent=true); // send buf
byte sendMsgBuf(unsigned long id, byte ext, byte len, const byte *buf, bool wait_sent=true); // send buf
byte readMsgBuf(byte *len, byte *buf); // read buf
byte readMsgBufID(unsigned long *ID, byte *len, byte *buf); // read buf with object ID
byte checkReceive(void); // if something received
byte checkError(void); // if something error
unsigned long getCanId(void); // get can id when receive
byte isRemoteRequest(void); // get RR flag when receive
byte isExtendedFrame(void); // did we recieve 29bit frame?
byte readMsgBufID(byte status, volatile unsigned long *id, volatile byte *ext, volatile byte *rtr, volatile byte *len, volatile byte *buf); // read buf with object ID
byte trySendMsgBuf(unsigned long id, byte ext, byte rtrBit, byte len, const byte *buf, byte iTxBuf=0xff); // as sendMsgBuf, but does not have any wait for free buffer
byte sendMsgBuf(byte status, unsigned long id, byte ext, byte rtrBit, byte len, volatile const byte *buf); // send message buf by using parsed buffer status
inline byte trySendExtMsgBuf(unsigned long id, byte len, const byte *buf, byte iTxBuf=0xff) { // as trySendMsgBuf, but set ext=1 and rtr=0
return trySendMsgBuf(id,1,0,len,buf,iTxBuf);
}
inline byte sendExtMsgBuf(byte status, unsigned long id, byte len, volatile const byte *buf) { // as sendMsgBuf, but set ext=1 and rtr=0
return sendMsgBuf(status,id,1,0,len,buf);
}
void clearBufferTransmitIfFlags(byte flags=0); // Clear transmit flags according to status
byte readRxTxStatus(void); // read has something send or received
byte checkClearRxStatus(byte *status); // read and clear and return first found rx status bit
byte checkClearTxStatus(byte *status, byte iTxBuf=0xff); // read and clear and return first found or buffer specified tx status bit
};
#endif
/*********************************************************************************************************
END FILE
*********************************************************************************************************/