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mcp_can.cpp
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mcp_can.cpp
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/*
mcp_can.cpp
2012 Copyright (c) Seeed Technology Inc. All right reserved.
2017 Copyright (c) Cory J. Fowler All Rights Reserved.
Author: Loovee
Contributor: Cory J. Fowler
2017-09-25
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-
1301 USA
*/
#include "mcp_can.h"
#define spi_readwrite mcpSPI->transfer
#define spi_read() spi_readwrite(0x00)
/*********************************************************************************************************
** Function name: mcp2515_reset
** Descriptions: Performs a software reset
*********************************************************************************************************/
void MCP_CAN::mcp2515_reset(void)
{
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_RESET);
MCP2515_UNSELECT();
mcpSPI->endTransaction();
delay(5); // If the MCP2515 was in sleep mode when the reset command was issued then we need to wait a while for it to reset properly
}
/*********************************************************************************************************
** Function name: mcp2515_readRegister
** Descriptions: Read data register
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_readRegister(const INT8U address)
{
INT8U ret;
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_READ);
spi_readwrite(address);
ret = spi_read();
MCP2515_UNSELECT();
mcpSPI->endTransaction();
return ret;
}
/*********************************************************************************************************
** Function name: mcp2515_readRegisterS
** Descriptions: Reads successive data registers
*********************************************************************************************************/
void MCP_CAN::mcp2515_readRegisterS(const INT8U address, INT8U values[], const INT8U n)
{
INT8U i;
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_READ);
spi_readwrite(address);
// mcp2515 has auto-increment of address-pointer
for (i=0; i<n; i++)
values[i] = spi_read();
MCP2515_UNSELECT();
mcpSPI->endTransaction();
}
/*********************************************************************************************************
** Function name: mcp2515_setRegister
** Descriptions: Sets data register
*********************************************************************************************************/
void MCP_CAN::mcp2515_setRegister(const INT8U address, const INT8U value)
{
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_WRITE);
spi_readwrite(address);
spi_readwrite(value);
MCP2515_UNSELECT();
mcpSPI->endTransaction();
}
/*********************************************************************************************************
** Function name: mcp2515_setRegisterS
** Descriptions: Sets successive data registers
*********************************************************************************************************/
void MCP_CAN::mcp2515_setRegisterS(const INT8U address, const INT8U values[], const INT8U n)
{
INT8U i;
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_WRITE);
spi_readwrite(address);
for (i=0; i<n; i++)
spi_readwrite(values[i]);
MCP2515_UNSELECT();
mcpSPI->endTransaction();
}
/*********************************************************************************************************
** Function name: mcp2515_modifyRegister
** Descriptions: Sets specific bits of a register
*********************************************************************************************************/
void MCP_CAN::mcp2515_modifyRegister(const INT8U address, const INT8U mask, const INT8U data)
{
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_BITMOD);
spi_readwrite(address);
spi_readwrite(mask);
spi_readwrite(data);
MCP2515_UNSELECT();
mcpSPI->endTransaction();
}
/*********************************************************************************************************
** Function name: mcp2515_readStatus
** Descriptions: Reads status register
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_readStatus(void)
{
INT8U i;
mcpSPI->beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
MCP2515_SELECT();
spi_readwrite(MCP_READ_STATUS);
i = spi_read();
MCP2515_UNSELECT();
mcpSPI->endTransaction();
return i;
}
/*********************************************************************************************************
** Function name: setSleepWakeup
** Descriptions: Enable or disable the wake up interrupt (If disabled the MCP2515 will not be woken up by CAN bus activity)
*********************************************************************************************************/
void MCP_CAN::setSleepWakeup(const INT8U enable)
{
mcp2515_modifyRegister(MCP_CANINTE, MCP_WAKIF, enable ? MCP_WAKIF : 0);
}
/*********************************************************************************************************
** Function name: setMode
** Descriptions: Sets control mode
*********************************************************************************************************/
INT8U MCP_CAN::setMode(const INT8U opMode)
{
mcpMode = opMode;
return mcp2515_setCANCTRL_Mode(mcpMode);
}
/*********************************************************************************************************
** Function name: mcp2515_setCANCTRL_Mode
** Descriptions: Set control mode
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_setCANCTRL_Mode(const INT8U newmode)
{
// If the chip is asleep and we want to change mode then a manual wake needs to be done
// This is done by setting the wake up interrupt flag
// This undocumented trick was found at https://github.com/mkleemann/can/blob/master/can_sleep_mcp2515.c
if((mcp2515_readRegister(MCP_CANSTAT) & MODE_MASK) == MCP_SLEEP && newmode != MCP_SLEEP)
{
// Make sure wake interrupt is enabled
byte wakeIntEnabled = (mcp2515_readRegister(MCP_CANINTE) & MCP_WAKIF);
if(!wakeIntEnabled)
mcp2515_modifyRegister(MCP_CANINTE, MCP_WAKIF, MCP_WAKIF);
// Set wake flag (this does the actual waking up)
mcp2515_modifyRegister(MCP_CANINTF, MCP_WAKIF, MCP_WAKIF);
// Wait for the chip to exit SLEEP and enter LISTENONLY mode.
// If the chip is not connected to a CAN bus (or the bus has no other powered nodes) it will sometimes trigger the wake interrupt as soon
// as it's put to sleep, but it will stay in SLEEP mode instead of automatically switching to LISTENONLY mode.
// In this situation the mode needs to be manually set to LISTENONLY.
if(mcp2515_requestNewMode(MCP_LISTENONLY) != MCP2515_OK)
return MCP2515_FAIL;
// Turn wake interrupt back off if it was originally off
if(!wakeIntEnabled)
mcp2515_modifyRegister(MCP_CANINTE, MCP_WAKIF, 0);
}
// Clear wake flag
mcp2515_modifyRegister(MCP_CANINTF, MCP_WAKIF, 0);
return mcp2515_requestNewMode(newmode);
}
/*********************************************************************************************************
** Function name: mcp2515_requestNewMode
** Descriptions: Set control mode
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_requestNewMode(const INT8U newmode)
{
byte startTime = millis();
// Spam new mode request and wait for the operation to complete
while(1)
{
// Request new mode
// This is inside the loop as sometimes requesting the new mode once doesn't work (usually when attempting to sleep)
mcp2515_modifyRegister(MCP_CANCTRL, MODE_MASK, newmode);
byte statReg = mcp2515_readRegister(MCP_CANSTAT);
if((statReg & MODE_MASK) == newmode) // We're now in the new mode
return MCP2515_OK;
else if((byte)(millis() - startTime) > 200) // Wait no more than 200ms for the operation to complete
return MCP2515_FAIL;
}
}
/*********************************************************************************************************
** Function name: mcp2515_configRate
** Descriptions: Set baudrate
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_configRate(const INT8U canSpeed, const INT8U canClock)
{
INT8U set, cfg1, cfg2, cfg3;
set = 1;
switch (canClock & MCP_CLOCK_SELECT)
{
case (MCP_8MHZ):
switch (canSpeed)
{
case (CAN_5KBPS): // 5KBPS
cfg1 = MCP_8MHz_5kBPS_CFG1;
cfg2 = MCP_8MHz_5kBPS_CFG2;
cfg3 = MCP_8MHz_5kBPS_CFG3;
break;
case (CAN_10KBPS): // 10KBPS
cfg1 = MCP_8MHz_10kBPS_CFG1;
cfg2 = MCP_8MHz_10kBPS_CFG2;
cfg3 = MCP_8MHz_10kBPS_CFG3;
break;
case (CAN_20KBPS): // 20KBPS
cfg1 = MCP_8MHz_20kBPS_CFG1;
cfg2 = MCP_8MHz_20kBPS_CFG2;
cfg3 = MCP_8MHz_20kBPS_CFG3;
break;
case (CAN_31K25BPS): // 31.25KBPS
cfg1 = MCP_8MHz_31k25BPS_CFG1;
cfg2 = MCP_8MHz_31k25BPS_CFG2;
cfg3 = MCP_8MHz_31k25BPS_CFG3;
break;
case (CAN_33K3BPS): // 33.33KBPS
cfg1 = MCP_8MHz_33k3BPS_CFG1;
cfg2 = MCP_8MHz_33k3BPS_CFG2;
cfg3 = MCP_8MHz_33k3BPS_CFG3;
break;
case (CAN_40KBPS): // 40Kbps
cfg1 = MCP_8MHz_40kBPS_CFG1;
cfg2 = MCP_8MHz_40kBPS_CFG2;
cfg3 = MCP_8MHz_40kBPS_CFG3;
break;
case (CAN_50KBPS): // 50Kbps
cfg1 = MCP_8MHz_50kBPS_CFG1;
cfg2 = MCP_8MHz_50kBPS_CFG2;
cfg3 = MCP_8MHz_50kBPS_CFG3;
break;
case (CAN_80KBPS): // 80Kbps
cfg1 = MCP_8MHz_80kBPS_CFG1;
cfg2 = MCP_8MHz_80kBPS_CFG2;
cfg3 = MCP_8MHz_80kBPS_CFG3;
break;
case (CAN_100KBPS): // 100Kbps
cfg1 = MCP_8MHz_100kBPS_CFG1;
cfg2 = MCP_8MHz_100kBPS_CFG2;
cfg3 = MCP_8MHz_100kBPS_CFG3;
break;
case (CAN_125KBPS): // 125Kbps
cfg1 = MCP_8MHz_125kBPS_CFG1;
cfg2 = MCP_8MHz_125kBPS_CFG2;
cfg3 = MCP_8MHz_125kBPS_CFG3;
break;
case (CAN_200KBPS): // 200Kbps
cfg1 = MCP_8MHz_200kBPS_CFG1;
cfg2 = MCP_8MHz_200kBPS_CFG2;
cfg3 = MCP_8MHz_200kBPS_CFG3;
break;
case (CAN_250KBPS): // 250Kbps
cfg1 = MCP_8MHz_250kBPS_CFG1;
cfg2 = MCP_8MHz_250kBPS_CFG2;
cfg3 = MCP_8MHz_250kBPS_CFG3;
break;
case (CAN_500KBPS): // 500Kbps
cfg1 = MCP_8MHz_500kBPS_CFG1;
cfg2 = MCP_8MHz_500kBPS_CFG2;
cfg3 = MCP_8MHz_500kBPS_CFG3;
break;
case (CAN_1000KBPS): // 1Mbps
cfg1 = MCP_8MHz_1000kBPS_CFG1;
cfg2 = MCP_8MHz_1000kBPS_CFG2;
cfg3 = MCP_8MHz_1000kBPS_CFG3;
break;
default:
set = 0;
return MCP2515_FAIL;
break;
}
break;
case (MCP_16MHZ):
switch (canSpeed)
{
case (CAN_5KBPS): // 5Kbps
cfg1 = MCP_16MHz_5kBPS_CFG1;
cfg2 = MCP_16MHz_5kBPS_CFG2;
cfg3 = MCP_16MHz_5kBPS_CFG3;
break;
case (CAN_10KBPS): // 10Kbps
cfg1 = MCP_16MHz_10kBPS_CFG1;
cfg2 = MCP_16MHz_10kBPS_CFG2;
cfg3 = MCP_16MHz_10kBPS_CFG3;
break;
case (CAN_20KBPS): // 20Kbps
cfg1 = MCP_16MHz_20kBPS_CFG1;
cfg2 = MCP_16MHz_20kBPS_CFG2;
cfg3 = MCP_16MHz_20kBPS_CFG3;
break;
case (CAN_33K3BPS): // 20Kbps
cfg1 = MCP_16MHz_33k3BPS_CFG1;
cfg2 = MCP_16MHz_33k3BPS_CFG2;
cfg3 = MCP_16MHz_33k3BPS_CFG3;
break;
case (CAN_40KBPS): // 40Kbps
cfg1 = MCP_16MHz_40kBPS_CFG1;
cfg2 = MCP_16MHz_40kBPS_CFG2;
cfg3 = MCP_16MHz_40kBPS_CFG3;
break;
case (CAN_50KBPS): // 50Kbps
cfg2 = MCP_16MHz_50kBPS_CFG2;
cfg3 = MCP_16MHz_50kBPS_CFG3;
break;
case (CAN_80KBPS): // 80Kbps
cfg1 = MCP_16MHz_80kBPS_CFG1;
cfg2 = MCP_16MHz_80kBPS_CFG2;
cfg3 = MCP_16MHz_80kBPS_CFG3;
break;
case (CAN_100KBPS): // 100Kbps
cfg1 = MCP_16MHz_100kBPS_CFG1;
cfg2 = MCP_16MHz_100kBPS_CFG2;
cfg3 = MCP_16MHz_100kBPS_CFG3;
break;
case (CAN_125KBPS): // 125Kbps
cfg1 = MCP_16MHz_125kBPS_CFG1;
cfg2 = MCP_16MHz_125kBPS_CFG2;
cfg3 = MCP_16MHz_125kBPS_CFG3;
break;
case (CAN_200KBPS): // 200Kbps
cfg1 = MCP_16MHz_200kBPS_CFG1;
cfg2 = MCP_16MHz_200kBPS_CFG2;
cfg3 = MCP_16MHz_200kBPS_CFG3;
break;
case (CAN_250KBPS): // 250Kbps
cfg1 = MCP_16MHz_250kBPS_CFG1;
cfg2 = MCP_16MHz_250kBPS_CFG2;
cfg3 = MCP_16MHz_250kBPS_CFG3;
break;
case (CAN_500KBPS): // 500Kbps
cfg1 = MCP_16MHz_500kBPS_CFG1;
cfg2 = MCP_16MHz_500kBPS_CFG2;
cfg3 = MCP_16MHz_500kBPS_CFG3;
break;
case (CAN_1000KBPS): // 1Mbps
cfg1 = MCP_16MHz_1000kBPS_CFG1;
cfg2 = MCP_16MHz_1000kBPS_CFG2;
cfg3 = MCP_16MHz_1000kBPS_CFG3;
break;
default:
set = 0;
return MCP2515_FAIL;
break;
}
break;
case (MCP_20MHZ):
switch (canSpeed)
{
case (CAN_40KBPS): // 40Kbps
cfg1 = MCP_20MHz_40kBPS_CFG1;
cfg2 = MCP_20MHz_40kBPS_CFG2;
cfg3 = MCP_20MHz_40kBPS_CFG3;
break;
case (CAN_50KBPS): // 50Kbps
cfg1 = MCP_20MHz_50kBPS_CFG1;
cfg2 = MCP_20MHz_50kBPS_CFG2;
cfg3 = MCP_20MHz_50kBPS_CFG3;
break;
case (CAN_80KBPS): // 80Kbps
cfg1 = MCP_20MHz_80kBPS_CFG1;
cfg2 = MCP_20MHz_80kBPS_CFG2;
cfg3 = MCP_20MHz_80kBPS_CFG3;
break;
case (CAN_100KBPS): // 100Kbps
cfg1 = MCP_20MHz_100kBPS_CFG1;
cfg2 = MCP_20MHz_100kBPS_CFG2;
cfg3 = MCP_20MHz_100kBPS_CFG3;
break;
case (CAN_125KBPS): // 125Kbps
cfg1 = MCP_20MHz_125kBPS_CFG1;
cfg2 = MCP_20MHz_125kBPS_CFG2;
cfg3 = MCP_20MHz_125kBPS_CFG3;
break;
case (CAN_200KBPS): // 200Kbps
cfg1 = MCP_20MHz_200kBPS_CFG1;
cfg2 = MCP_20MHz_200kBPS_CFG2;
cfg3 = MCP_20MHz_200kBPS_CFG3;
break;
case (CAN_250KBPS): // 250Kbps
cfg1 = MCP_20MHz_250kBPS_CFG1;
cfg2 = MCP_20MHz_250kBPS_CFG2;
cfg3 = MCP_20MHz_250kBPS_CFG3;
break;
case (CAN_500KBPS): // 500Kbps
cfg1 = MCP_20MHz_500kBPS_CFG1;
cfg2 = MCP_20MHz_500kBPS_CFG2;
cfg3 = MCP_20MHz_500kBPS_CFG3;
break;
case (CAN_1000KBPS): // 1Mbps
cfg1 = MCP_20MHz_1000kBPS_CFG1;
cfg2 = MCP_20MHz_1000kBPS_CFG2;
cfg3 = MCP_20MHz_1000kBPS_CFG3;
break;
default:
set = 0;
return MCP2515_FAIL;
break;
}
break;
default:
set = 0;
return MCP2515_FAIL;
break;
}
if (canClock & MCP_CLKOUT_ENABLE) {
cfg3 &= (~SOF_ENABLE);
}
if (set) {
mcp2515_setRegister(MCP_CNF1, cfg1);
mcp2515_setRegister(MCP_CNF2, cfg2);
mcp2515_setRegister(MCP_CNF3, cfg3);
return MCP2515_OK;
}
return MCP2515_FAIL;
}
/*********************************************************************************************************
** Function name: mcp2515_initCANBuffers
** Descriptions: Initialize Buffers, Masks, and Filters
*********************************************************************************************************/
void MCP_CAN::mcp2515_initCANBuffers(void)
{
INT8U i, a1, a2, a3;
INT8U std = 0;
INT8U ext = 1;
INT32U ulMask = 0x00, ulFilt = 0x00;
mcp2515_write_mf(MCP_RXM0SIDH, ext, ulMask); /*Set both masks to 0 */
mcp2515_write_mf(MCP_RXM1SIDH, ext, ulMask); /*Mask register ignores ext bit */
/* Set all filters to 0 */
mcp2515_write_mf(MCP_RXF0SIDH, ext, ulFilt); /* RXB0: extended */
mcp2515_write_mf(MCP_RXF1SIDH, std, ulFilt); /* RXB1: standard */
mcp2515_write_mf(MCP_RXF2SIDH, ext, ulFilt); /* RXB2: extended */
mcp2515_write_mf(MCP_RXF3SIDH, std, ulFilt); /* RXB3: standard */
mcp2515_write_mf(MCP_RXF4SIDH, ext, ulFilt);
mcp2515_write_mf(MCP_RXF5SIDH, std, ulFilt);
/* Clear, deactivate the three */
/* transmit buffers */
/* TXBnCTRL -> TXBnD7 */
a1 = MCP_TXB0CTRL;
a2 = MCP_TXB1CTRL;
a3 = MCP_TXB2CTRL;
for (i = 0; i < 14; i++) { /* in-buffer loop */
mcp2515_setRegister(a1, 0);
mcp2515_setRegister(a2, 0);
mcp2515_setRegister(a3, 0);
a1++;
a2++;
a3++;
}
mcp2515_setRegister(MCP_RXB0CTRL, 0);
mcp2515_setRegister(MCP_RXB1CTRL, 0);
}
/*********************************************************************************************************
** Function name: mcp2515_init
** Descriptions: Initialize the controller
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_init(const INT8U canIDMode, const INT8U canSpeed, const INT8U canClock)
{
INT8U res;
mcp2515_reset();
mcpMode = MCP_LOOPBACK;
res = mcp2515_setCANCTRL_Mode(MODE_CONFIG);
if(res > 0)
{
#if DEBUG_MODE
Serial.println(F("Entering Configuration Mode Failure..."));
#endif
return res;
}
#if DEBUG_MODE
Serial.println(F("Entering Configuration Mode Successful!"));
#endif
// Set Baudrate
if(mcp2515_configRate(canSpeed, canClock))
{
#if DEBUG_MODE
Serial.println(F("Setting Baudrate Failure..."));
#endif
return res;
}
#if DEBUG_MODE
Serial.println(F("Setting Baudrate Successful!"));
#endif
if ( res == MCP2515_OK ) {
/* init canbuffers */
mcp2515_initCANBuffers();
/* interrupt mode */
mcp2515_setRegister(MCP_CANINTE, MCP_RX0IF | MCP_RX1IF);
//Sets BF pins as GPO
mcp2515_setRegister(MCP_BFPCTRL,MCP_BxBFS_MASK | MCP_BxBFE_MASK);
//Sets RTS pins as GPI
mcp2515_setRegister(MCP_TXRTSCTRL,0x00);
switch(canIDMode)
{
case (MCP_ANY):
mcp2515_modifyRegister(MCP_RXB0CTRL,
MCP_RXB_RX_MASK | MCP_RXB_BUKT_MASK,
MCP_RXB_RX_ANY | MCP_RXB_BUKT_MASK);
mcp2515_modifyRegister(MCP_RXB1CTRL, MCP_RXB_RX_MASK,
MCP_RXB_RX_ANY);
break;
/* The followingn two functions of the MCP2515 do not work, there is a bug in the silicon.
case (MCP_STD):
mcp2515_modifyRegister(MCP_RXB0CTRL,
MCP_RXB_RX_MASK | MCP_RXB_BUKT_MASK,
MCP_RXB_RX_STD | MCP_RXB_BUKT_MASK );
mcp2515_modifyRegister(MCP_RXB1CTRL, MCP_RXB_RX_MASK,
MCP_RXB_RX_STD);
break;
case (MCP_EXT):
mcp2515_modifyRegister(MCP_RXB0CTRL,
MCP_RXB_RX_MASK | MCP_RXB_BUKT_MASK,
MCP_RXB_RX_EXT | MCP_RXB_BUKT_MASK );
mcp2515_modifyRegister(MCP_RXB1CTRL, MCP_RXB_RX_MASK,
MCP_RXB_RX_EXT);
break;
*/
case (MCP_STDEXT):
mcp2515_modifyRegister(MCP_RXB0CTRL,
MCP_RXB_RX_MASK | MCP_RXB_BUKT_MASK,
MCP_RXB_RX_STDEXT | MCP_RXB_BUKT_MASK );
mcp2515_modifyRegister(MCP_RXB1CTRL, MCP_RXB_RX_MASK,
MCP_RXB_RX_STDEXT);
break;
default:
#if DEBUG_MODE
Serial.println(F("`Setting ID Mode Failure..."));
#endif
return MCP2515_FAIL;
break;
}
res = mcp2515_setCANCTRL_Mode(mcpMode);
if(res)
{
#if DEBUG_MODE
Serial.println(F("Returning to Previous Mode Failure..."));
#endif
return res;
}
}
return res;
}
/*********************************************************************************************************
** Function name: mcp2515_write_id
** Descriptions: Write CAN ID
*********************************************************************************************************/
void MCP_CAN::mcp2515_write_id( const INT8U mcp_addr, const INT8U ext, const INT32U id )
{
uint16_t canid;
INT8U tbufdata[4];
canid = (uint16_t)(id & 0x0FFFF);
if ( ext == 1)
{
tbufdata[MCP_EID0] = (INT8U) (canid & 0xFF);
tbufdata[MCP_EID8] = (INT8U) (canid >> 8);
canid = (uint16_t)(id >> 16);
tbufdata[MCP_SIDL] = (INT8U) (canid & 0x03);
tbufdata[MCP_SIDL] += (INT8U) ((canid & 0x1C) << 3);
tbufdata[MCP_SIDL] |= MCP_TXB_EXIDE_M;
tbufdata[MCP_SIDH] = (INT8U) (canid >> 5 );
}
else
{
tbufdata[MCP_SIDH] = (INT8U) (canid >> 3 );
tbufdata[MCP_SIDL] = (INT8U) ((canid & 0x07 ) << 5);
tbufdata[MCP_EID0] = 0;
tbufdata[MCP_EID8] = 0;
}
mcp2515_setRegisterS( mcp_addr, tbufdata, 4 );
}
/*********************************************************************************************************
** Function name: mcp2515_write_mf
** Descriptions: Write Masks and Filters
*********************************************************************************************************/
void MCP_CAN::mcp2515_write_mf( const INT8U mcp_addr, const INT8U ext, const INT32U id )
{
uint16_t canid;
INT8U tbufdata[4];
canid = (uint16_t)(id & 0x0FFFF);
if ( ext == 1)
{
tbufdata[MCP_EID0] = (INT8U) (canid & 0xFF);
tbufdata[MCP_EID8] = (INT8U) (canid >> 8);
canid = (uint16_t)(id >> 16);
tbufdata[MCP_SIDL] = (INT8U) (canid & 0x03);
tbufdata[MCP_SIDL] += (INT8U) ((canid & 0x1C) << 3);
tbufdata[MCP_SIDL] |= MCP_TXB_EXIDE_M;
tbufdata[MCP_SIDH] = (INT8U) (canid >> 5 );
}
else
{
tbufdata[MCP_EID0] = (INT8U) (canid & 0xFF);
tbufdata[MCP_EID8] = (INT8U) (canid >> 8);
canid = (uint16_t)(id >> 16);
tbufdata[MCP_SIDL] = (INT8U) ((canid & 0x07) << 5);
tbufdata[MCP_SIDH] = (INT8U) (canid >> 3 );
}
mcp2515_setRegisterS( mcp_addr, tbufdata, 4 );
}
/*********************************************************************************************************
** Function name: mcp2515_read_id
** Descriptions: Read CAN ID
*********************************************************************************************************/
void MCP_CAN::mcp2515_read_id( const INT8U mcp_addr, INT8U* ext, INT32U* id )
{
INT8U tbufdata[4];
*ext = 0;
*id = 0;
mcp2515_readRegisterS( mcp_addr, tbufdata, 4 );
*id = (tbufdata[MCP_SIDH]<<3) + (tbufdata[MCP_SIDL]>>5);
if ( (tbufdata[MCP_SIDL] & MCP_TXB_EXIDE_M) == MCP_TXB_EXIDE_M )
{
/* extended id */
*id = (*id<<2) + (tbufdata[MCP_SIDL] & 0x03);
*id = (*id<<8) + tbufdata[MCP_EID8];
*id = (*id<<8) + tbufdata[MCP_EID0];
*ext = 1;
}
}
/*********************************************************************************************************
** Function name: mcp2515_write_canMsg
** Descriptions: Write message
*********************************************************************************************************/
void MCP_CAN::mcp2515_write_canMsg( const INT8U buffer_sidh_addr)
{
INT8U mcp_addr;
mcp_addr = buffer_sidh_addr;
mcp2515_setRegisterS(mcp_addr+5, m_nDta, m_nDlc ); /* write data bytes */
if ( m_nRtr == 1) /* if RTR set bit in byte */
m_nDlc |= MCP_RTR_MASK;
mcp2515_setRegister((mcp_addr+4), m_nDlc ); /* write the RTR and DLC */
mcp2515_write_id(mcp_addr, m_nExtFlg, m_nID ); /* write CAN id */
}
/*********************************************************************************************************
** Function name: mcp2515_read_canMsg
** Descriptions: Read message
*********************************************************************************************************/
void MCP_CAN::mcp2515_read_canMsg( const INT8U buffer_sidh_addr) /* read can msg */
{
INT8U mcp_addr, ctrl;
mcp_addr = buffer_sidh_addr;
mcp2515_read_id( mcp_addr, &m_nExtFlg,&m_nID );
ctrl = mcp2515_readRegister( mcp_addr-1 );
m_nDlc = mcp2515_readRegister( mcp_addr+4 );
if(m_nDlc > MAX_CHAR_IN_MESSAGE) m_nDlc = MAX_CHAR_IN_MESSAGE;
if (ctrl & 0x08)
m_nRtr = 1;
else
m_nRtr = 0;
m_nDlc &= MCP_DLC_MASK;
mcp2515_readRegisterS( mcp_addr+5, &(m_nDta[0]), m_nDlc );
}
/*********************************************************************************************************
** Function name: mcp2515_getNextFreeTXBuf
** Descriptions: Send message
*********************************************************************************************************/
INT8U MCP_CAN::mcp2515_getNextFreeTXBuf(INT8U *txbuf_n) /* get Next free txbuf */
{
INT8U res, i, ctrlval;
INT8U ctrlregs[MCP_N_TXBUFFERS] = { MCP_TXB0CTRL, MCP_TXB1CTRL, MCP_TXB2CTRL };
res = MCP_ALLTXBUSY;
*txbuf_n = 0x00;
/* check all 3 TX-Buffers */
for (i=0; i<MCP_N_TXBUFFERS; i++) {
ctrlval = mcp2515_readRegister( ctrlregs[i] );
if ( (ctrlval & MCP_TXB_TXREQ_M) == 0 ) {
*txbuf_n = ctrlregs[i]+1; /* return SIDH-address of Buffer*/
res = MCP2515_OK;
return res; /* ! function exit */
}
}
return res;
}
/*********************************************************************************************************
** Function name: MCP_CAN
** Descriptions: Public function to declare CAN class and the /CS pin.
*********************************************************************************************************/
MCP_CAN::MCP_CAN(INT8U _CS)
{
MCPCS = _CS;
MCP2515_UNSELECT();
pinMode(MCPCS, OUTPUT);
mcpSPI = &SPI;
}
/*********************************************************************************************************
** Function name: MCP_CAN
** Descriptions: Public function to declare CAN class with SPI and the /CS pin.
*********************************************************************************************************/
MCP_CAN::MCP_CAN(SPIClass *_SPI, INT8U _CS)
{
MCPCS = _CS;
MCP2515_UNSELECT();
pinMode(MCPCS, OUTPUT);
mcpSPI = _SPI;
}
/*********************************************************************************************************
** Function name: begin
** Descriptions: Public function to declare controller initialization parameters.
*********************************************************************************************************/
INT8U MCP_CAN::begin(INT8U idmodeset, INT8U speedset, INT8U clockset)
{
INT8U res;
mcpSPI->begin();
res = mcp2515_init(idmodeset, speedset, clockset);
if (res == MCP2515_OK)
return CAN_OK;
return CAN_FAILINIT;
}
/*********************************************************************************************************
** Function name: init_Mask
** Descriptions: Public function to set mask(s).
*********************************************************************************************************/
INT8U MCP_CAN::init_Mask(INT8U num, INT8U ext, INT32U ulData)
{
INT8U res = MCP2515_OK;
#if DEBUG_MODE
Serial.println(F("Starting to Set Mask!"));
#endif
res = mcp2515_setCANCTRL_Mode(MODE_CONFIG);
if(res > 0){
#if DEBUG_MODE
Serial.println(F("Entering Configuration Mode Failure..."));
#endif
return res;
}
if (num == 0){
mcp2515_write_mf(MCP_RXM0SIDH, ext, ulData);
}
else if(num == 1){
mcp2515_write_mf(MCP_RXM1SIDH, ext, ulData);
}
else res = MCP2515_FAIL;
res = mcp2515_setCANCTRL_Mode(mcpMode);
if(res > 0){
#if DEBUG_MODE
Serial.println(F("Entering Previous Mode Failure..."));
Serial.println(F("Setting Mask Failure..."));
#endif
return res;
}
#if DEBUG_MODE
Serial.println(F("Setting Mask Successful!"));
#endif
return res;
}
/*********************************************************************************************************
** Function name: init_Mask
** Descriptions: Public function to set mask(s).
*********************************************************************************************************/
INT8U MCP_CAN::init_Mask(INT8U num, INT32U ulData)
{
INT8U res = MCP2515_OK;
INT8U ext = 0;
#if DEBUG_MODE
Serial.println(F("Starting to Set Mask!"));
#endif
res = mcp2515_setCANCTRL_Mode(MODE_CONFIG);
if(res > 0){
#if DEBUG_MODE
Serial.println(F("Entering Configuration Mode Failure..."));
#endif
return res;
}
if((ulData & 0x80000000) == 0x80000000)
ext = 1;
if (num == 0){
mcp2515_write_mf(MCP_RXM0SIDH, ext, ulData);
}
else if(num == 1){
mcp2515_write_mf(MCP_RXM1SIDH, ext, ulData);
}
else res = MCP2515_FAIL;
res = mcp2515_setCANCTRL_Mode(mcpMode);
if(res > 0){
#if DEBUG_MODE
Serial.println(F("Entering Previous Mode Failure..."));
Serial.println(F("Setting Mask Failure..."));
#endif
return res;
}
#if DEBUG_MODE
Serial.println(F("Setting Mask Successful!"));
#endif
return res;
}
/*********************************************************************************************************
** Function name: init_Filt
** Descriptions: Public function to set filter(s).
*********************************************************************************************************/
INT8U MCP_CAN::init_Filt(INT8U num, INT8U ext, INT32U ulData)
{
INT8U res = MCP2515_OK;
#if DEBUG_MODE
Serial.println(F("Starting to Set Filter!"));
#endif
res = mcp2515_setCANCTRL_Mode(MODE_CONFIG);
if(res > 0)
{
#if DEBUG_MODE
Serial.println(F("Enter Configuration Mode Failure..."));
#endif
return res;
}
switch( num )
{
case 0:
mcp2515_write_mf(MCP_RXF0SIDH, ext, ulData);
break;
case 1:
mcp2515_write_mf(MCP_RXF1SIDH, ext, ulData);
break;
case 2:
mcp2515_write_mf(MCP_RXF2SIDH, ext, ulData);
break;
case 3:
mcp2515_write_mf(MCP_RXF3SIDH, ext, ulData);
break;
case 4:
mcp2515_write_mf(MCP_RXF4SIDH, ext, ulData);
break;
case 5:
mcp2515_write_mf(MCP_RXF5SIDH, ext, ulData);
break;
default:
res = MCP2515_FAIL;
}
res = mcp2515_setCANCTRL_Mode(mcpMode);
if(res > 0)
{
#if DEBUG_MODE
Serial.println(F("Entering Previous Mode Failure..."));
Serial.println(F("Setting Filter Failure..."));
#endif
return res;
}
#if DEBUG_MODE
Serial.println(F("Setting Filter Successful!"));
#endif
return res;
}