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Sample code for Arduino CAN
Dependencies: mbed
Diff: arduinoCAN.cpp
- Revision:
- 0:6ed8574c6258
diff -r 000000000000 -r 6ed8574c6258 arduinoCAN.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/arduinoCAN.cpp Mon Feb 29 19:33:12 2016 +0000 @@ -0,0 +1,897 @@ +/* + * Copyright (C) 2009 Libelium Comunicaciones Distribuidas S.L. + * http://www.libelium.com + * + * This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>. + * + * Version: 0.3 + * Design: David Gascon + * Implementation: Luis Antonio Martin & Ahmad Saad + */ + +#include "Arduino.h" +#include "arduinoCAN.h" +#include "../SPI/SPI.h" +#include "../arduino-api/arduinoMultiprotocol.h" +#include "../arduino-api/arduinoUtils.h" + + + +#define DEBUGMODE 0 +/*********************************************************************** + * Constructors + ***********************************************************************/ + +CAN::CAN(void){} + + +/*********************************************************************** + * PUBLIC METHODS + ***********************************************************************/ + +//!************************************************************* +//! Name: ON() +//! Description: Initialization MCP2515 +//! Param : void +//! Returns: "1" if no error, "0" if error +//!************************************************************* +bool CAN::begin(uint16_t speed) +{ + + #if (DEBUGMODE ==1 ) + Serial.println("-- Constructor Can(uint16_t speed) --"); + #endif + + // Initialize in Socket1 + Utils.setONSocket0(); + Utils.setMUXSocket0(); + Utils.unsetCSSocket0(); + + //Initialization SPI + SPI.begin(); + SPI.detachInterrupt(); + SPI.setBitOrder(MSBFIRST); + // both mode 0 & 3 should work + SPI.setDataMode(SPI_MODE0); + + //Set the SPI frequency + SPI.setClockDivider(SPI_CLOCK_DIV128); + + #if (DEBUGMODE==1) + Serial.println("SPI configured"); + #endif + + + //Software resets MCP2515 + reset(); + delay(10); + + //After the reset enters configuration mode + + //Choose the rate of CAN-bus + switch(speed){ + + case 1000: + #if (DEBUGMODE==1) + Serial.println("Speed=1Mbps"); + #endif + Utils.setCSSocket0(); + SPI.transfer(SPI_WRITE); + SPI.transfer(CNF3); + SPI.transfer((1<<PHSEG21)); + SPI.transfer((1<<BTLMODE)|(1<<PHSEG11)); + Utils.unsetCSSocket0(); + break; + + case 500: + #if (DEBUGMODE==1) + Serial.println("Speed=500kps"); + #endif + Utils.setCSSocket0(); + SPI.transfer(SPI_WRITE); + SPI.transfer(CNF3); + SPI.transfer((1<<PHSEG21)); + SPI.transfer((1<<BTLMODE)|(1<<PHSEG11)); + SPI.transfer((1<<BRP0)); + Utils.unsetCSSocket0(); + break; + + case 250: + #if (DEBUGMODE==1) + Serial.println("Speed=250kps"); + #endif + Utils.setCSSocket0(); + SPI.transfer(SPI_WRITE); + SPI.transfer(CNF3); + SPI.transfer((1<<PHSEG20)|(1<<PHSEG22)); + SPI.transfer((1<<BTLMODE)|(1<<PHSEG12)|(1<<PHSEG11)|(1<<PHSEG10)); + SPI.transfer((1<<BRP0)); + Utils.unsetCSSocket0(); + break; + + default: + #if (DEBUGMODE==1) + Serial.println("The rate requested is unavailable, is set to 125 Kbit/s by default"); + #endif + Utils.setCSSocket0(); + SPI.transfer(SPI_WRITE); + SPI.transfer(CNF3); + SPI.transfer((1<<PHSEG21)); + SPI.transfer((1<<BTLMODE)|(1<<PHSEG11)); + SPI.transfer((1<<BRP2)|(1<<BRP1)|(1<<BRP0)); + Utils.unsetCSSocket0(); + break; + + } + + //Enable interrupts the Rx Buffer + writeRegister(CANINTE,(1<<RX1IE)|(1<<RX0IE)); + + //Filters and masks + //Bufer 0: All the messages and Rollover + writeRegister(RXB0CTRL,(1<<RXM1)|(1<<RXM0)|(1<<BUKT)); + + //Bufer 1: All the messages + writeRegister(RXB1CTRL,(1<<RXM1)|(1<<RXM0)); + + //All bits of the mask reception delete + writeRegister( RXM0SIDH, 0 ); + writeRegister( RXM0SIDL, 0 ); + writeRegister( RXM0EID8, 0 ); + writeRegister( RXM0EID0, 0 ); + writeRegister( RXM1SIDH, 0 ); + writeRegister( RXM1SIDL, 0 ); + writeRegister( RXM1EID8, 0 ); + writeRegister( RXM1EID0, 0 ); + + //Disable pins RXnBF pins (high impedance state) + writeRegister( BFPCTRL, 0 ); + + //Set normal mode + setMode(NORMAL_MODE); + + //Test its correct mode + /* + if (read_register(CANSTAT) != 0) { + Serial.println("Failed to initialize the MCP2515, normal mode not activated"); + return false; + }*/ + + #if (DEBUGMODE==1) + Serial.println("-- End Constructor Can(uint16_t speed) --"); + Serial.println(""); + #endif + + return 1; +} + +//!************************************************************* +//! Name: getMessage() +//! Description: Take the CAN message +//! Param : messageCAN *rec_msje: pointer to reception buffer +//! Returns: "1" if no error, "0" if error +//!************************************************************* +char CAN::getMessage(messageCAN *rec_msje) +{ + //Bought that buffer is the message + char status = readStatus(SPI_RX_STATUS); + char addr; + static uint8_t previoSerialuffer; + + /* + if (bit_is_set(status,6)) { + //If the message is in the Buffer 1 + addr = SPI_READ_RX; + } + else if (bit_is_set(status,7)) + { + //If the message is in the Buffer 2 + addr = SPI_READ_RX | 0x04; + } + else { + // Error, the message is not available + return 0; + }*/ + + if ( (((status & 0b11000000)>>6)&0b00000011) >2 ) + { + addr=SPI_READ_RX | (previoSerialuffer++ & 0x01)<<2; + #if (DEBUGMODE==1) + Serial.println("Data in buffer available"); + #endif + } + else if (bit_is_set(status,6)) + { + addr = SPI_READ_RX; + #if (DEBUGMODE==1) + Serial.println("Data in buffer 0"); + #endif + } + else if (bit_is_set(status,7)) + { + addr = SPI_READ_RX | 0x04; + #if (DEBUGMODE==1) + Serial.println("Data in buffer 1"); + #endif + } + else { + // Error: no message available + #if (DEBUGMODE==1) + Serial.println("No messages"); + #endif + + return 0; + } + + Utils.setCSSocket0(); + SPI.transfer(addr); + + //Read id + rec_msje->id = (unsigned int) SPI.transfer(0xff) << 3; //Read the top + rec_msje->id |= SPI.transfer(0xff) >> 5; //Read the lower + + //Return the Extended ID + SPI.transfer(0xff); + SPI.transfer(0xff); + + //Read DLC + char length = SPI.transfer(0xff) & 0x0f; + + rec_msje->header.length = length; + rec_msje->header.rtr = (bit_is_set(status, 3)) ? 1 : 0; + + //Read data + for (char i=0;i<length;i++) { + rec_msje->data[i] = SPI.transfer(0xFF); + } + + Utils.unsetCSSocket0(); + + //Delete the interruptions flags + if (bit_is_set(status, 6)) { + bitModify(CANINTF, (1<<RX0IF), 0); + } + else { + bitModify(CANINTF, (1<<RX1IF), 0); + } + + return status; +} + + + +//!************************************************************* +//! Name: sendMessage() +//! Description: Send the CAN message +//! Param: messageCAN *send_msje: pointer to transmission buffer +//! Returns: "1" if no error, "0" if error +//!************************************************************* +char CAN::sendMessage(messageCAN *send_msje) +{ + char status = readStatus(SPI_READ_STATUS); + + /* Status char: + * + * Bit Funcion + * 2 TXB0CNTRL.TXREQ + * 4 TXB1CNTRL.TXREQ + * 6 TXB2CNTRL.TXREQ + */ + + char address; + + if (bit_is_clear(status, 2)) { + address = 0x00; + } else if (bit_is_clear(status, 4)) { + address = 0x02; + } else if (bit_is_clear(status, 6)) { + address = 0x04; + } else { + //All buffers are used can not send messages (returns 0) + return 0; + } + + Utils.setCSSocket0(); + SPI.transfer(SPI_WRITE_TX | address); + //First, send the top ID10....ID3 + SPI.transfer(send_msje->id >> 3); + //After sending the lower ID2....ID0 + SPI.transfer(send_msje->id << 5); + + //As we will not use the Extended ID you set it to 0 + SPI.transfer(0); + SPI.transfer(0); + + char length = send_msje->header.length & 0x0F; + + if (send_msje->header.rtr) { + SPI.transfer((1<<RTR) | length); + } else { + //Send the message length + SPI.transfer(length); + //Send data + for (char i=0;i<length;i++) { + SPI.transfer(send_msje->data[i]); + } + } + + Utils.unsetCSSocket0(); + + //Send message + Utils.setCSSocket0(); + address = (address == 0) ? 1 : address; + SPI.transfer(SPI_RTS | address); + Utils.unsetCSSocket0(); + + return address; +} + + +//!************************************************************* +//! Name: printMessage() +//! Description: CAN message print out the serial port +//! Param : messageCAN *msje: pointer to the message +//! Returns: "1" if no error, "0" if error +//!************************************************************* +void CAN::printMessage(messageCAN *msje) +{ + Serial.print(" id: "); + Serial.print(messageRx.id,HEX); + Serial.print(" rtr: "); + Serial.print(messageRx.header.rtr,HEX); + Serial.print(" => "); + + if (!msje->header.rtr) { + //Data + Serial.print(" data: "); + Serial.print(messageRx.data[0],HEX); Serial.print(","); + Serial.print(messageRx.data[1],HEX); Serial.print(","); + Serial.print(messageRx.data[2],HEX); Serial.print(","); + Serial.print(messageRx.data[3],HEX); Serial.print(","); + Serial.print(messageRx.data[4],HEX); Serial.print(","); + Serial.print(messageRx.data[5],HEX); Serial.print(","); + Serial.print(messageRx.data[6],HEX); Serial.print(","); + Serial.println(messageRx.data[7],HEX); + } +} + + +//!************************************************************* +//! Name: setMode() +//! Description: Configure the MCP2515 +//! Param : uint8_t mode: The work mode +//! Returns: void +//!************************************************************* +void CAN::setMode(uint8_t mode) +{ + uint8_t mode_register = 0; + + if (mode == LISTEN_ONLY_MODE) { + mode_register = (0<<REQOP2)|(1<<REQOP1)|(1<<REQOP0); + } + else if (mode == LOOPBACK_MODE) { + mode_register = (0<<REQOP2)|(1<<REQOP1)|(0<<REQOP0); + } + else if (mode == SLEEP_MODE) { + mode_register = (0<<REQOP2)|(0<<REQOP1)|(1<<REQOP0); + } + else if (mode == NORMAL_MODE) { + mode_register = (0<<REQOP2)|(0<<REQOP1)|(0<<REQOP0); + } + + //Set the new mode + bitModify(CANCTRL, (1<<REQOP2)|(1<<REQOP1)|(1<<REQOP0), mode_register); + + //Wait until the mode has been changed + while ((readRegister(CANSTAT) & 0xe0) != mode_register) { } +} + + +//!************************************************************* +//! Name: messageAvailable() +//! Description: Check if there is any message +//! Param : void +//! Returns: 1 if available, 0 if not. +//!************************************************************* +uint8_t CAN::messageAvailable(void) +{ + char status = readStatus(SPI_RX_STATUS); + + if ( (((status & 0b11000000)>>6)&0b00000011) >2 ) + { + return 1; + } else if (bit_is_set(status,6)) { + return 1; + } else if (bit_is_set(status,7)) { + return 1; + } else { + return 0; + + #if (DEBUGMODE==1) + Serial.println("No data available"); + #endif + } +} + +//********************************************************************** +// Standars PIDs +//********************************************************************** + + +//!************************************************************* +//! Name: getEngineLoad() +//! Description: Calculated engine load value +//! Param : void +//! Returns: unsigned int: engine load value (0-100) +//!************************************************************* +unsigned int CAN::getEngineLoad() +{ + unsigned int data; + + CiARequest(CALC_ENGINE_LOAD); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] * 100) / 255; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; +} + + +//!************************************************************* +//! Name: getEngineCoolantTemp() +//! Description: Engine coolant temperature +//! Param : void +//! Returns: Engine coolant temperature(-40 - 215) +//!************************************************************* +unsigned int CAN::getEngineCoolantTemp() +{ + unsigned int data; + + CiARequest(ENGINE_COOLANT_TEMP); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] - 40); + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; +} + + +//!************************************************************* +//! Name: getFuelPressure() +//! Description: Fuel pressure +//! Param : void +//! Returns: unsigned int: Fuel pressure (0 - 765 Kpa) +//!************************************************************* +unsigned int CAN::getFuelPressure() +{ + unsigned int data; + + CiARequest(FUEL_PRESSURE); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] * 3) ; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; +} + + +//!************************************************************* +//! Name: getIntakeMAPressure() +//! Description: Intake manifold absolute pressure +//! Param : void +//! Returns: unsigned int: absolute pressure (0 - 255 Kpa) +//!************************************************************* +unsigned int CAN::getIntakeMAPressure() +{ + unsigned int data; + + CiARequest(INTAKE_M_A_PRESSURE); + + if (messageRx.id==ID_RESPONSE) { + data = messageRx.data[3]; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; + + +} + + +//!************************************************************* +//! Name: getEngineRPM() +//! Description: Engine RPM +//! Param : void +//! Returns: unsigned int: Engine RPM (0 - 16,383 RPM) +//!************************************************************* +unsigned int CAN::getEngineRPM() +{ + + unsigned int data; + + CiARequest(ENGINE_RPM); + + if (messageRx.id==ID_RESPONSE) { + data = (uint16_t(messageRx.data[3]*256) + messageRx.data[4])/4; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; +} + + +//!************************************************************* +//! Name: getVehicleSpeed() +//! Description: Vehicle speed +//! Param : void +//! Returns: unsigned int: Vehicle speed (0 - 255) +//!************************************************************* +unsigned int CAN::getVehicleSpeed() +{ + unsigned int data; + + CiARequest(VEHICLE_SPEED); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3]); + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; + +} + + +//!************************************************************* +//! Name: getTimingAdvance() +//! Description: Timing advance +//! Param : void +//! Returns: unsigned int: Time (-64 - 63.5) +//!************************************************************* +unsigned int CAN::getTimingAdvance() +{ + unsigned int data; + + CiARequest(TIMING_ADVANCE); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] / 2- 64); + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; +} + +//!************************************************************* +//! Name: getIntankeAirTemp() +//! Description: Intake air temperature +//! Param : void +//! Returns: unsigned int: Intake air temperature(-40 - 215) +//!************************************************************* +unsigned int CAN::getIntankeAirTemp() +{ + unsigned int data; + + CiARequest(INTAKE_AIR_TEMP); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] - 40); + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; +} + + +//!************************************************************* +//! Name: getMAFairFlowRate() +//! Description: MAF air flow rate +//! Param : void +//! Returns: unsigned int: air flow rate (0 - 655.35 g/s) +//!************************************************************* +unsigned int CAN::getMAFairFlowRate() +{ + unsigned int data; + + CiARequest(MAF_AIR_FLOW_RATE); + + if (messageRx.id==ID_RESPONSE) { + data = ( uint16_t(messageRx.data[3] * 256) + messageRx.data[4]) / 100; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; + +} + + +//!************************************************************* +//! Name: getThrottlePosition() +//! Description: Throttle position +//! Param : void +//! Returns: unsigned int: Throttle position (0 - 100%) +//!************************************************************* +unsigned int CAN::getThrottlePosition() +{ + unsigned int data; + + CiARequest(THROTTLE_POSITION); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] * 100) / 255; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; + + +} + + +//!************************************************************* +//! Name: getFuelLevel() +//! Description: Fuel Level Input +//! Param : void +//! Returns: unsigned int: Fuel Level Input (0 - 100%) +//!************************************************************* +unsigned int CAN::getFuelLevel() +{ + unsigned int data; + + CiARequest(FUEL_LEVEL); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3] * 100) / 255; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; + +} + + +//!************************************************************* +//! Name: getBarometricPressure() +//! Description: Barometric pressure +//! Param : void +//! Returns: unsigned int: Barometric pressure (0 - 255 Kpa) +//!************************************************************* +unsigned int CAN::getBarometricPressure() +{ + unsigned int data; + + CiARequest(BAROMETRIC_PRESSURE); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t(messageRx.data[3]); + + #if (DEBUGMODE == 1) + printMessage(&messageRx); + #endif + } + + return data; +} + + +//!************************************************************* +//! Name: getEngineFuelRate() +//! Description: Engine fuel rate +//! Param : void +//! Returns: unsigned int: Engine fuel rate (0 - 3212 L/h) +//!************************************************************* +unsigned int CAN::getEngineFuelRate() +{ + unsigned int data; + + CiARequest(ENGINE_FUEL_RATE); + + if (messageRx.id==ID_RESPONSE) { + data = uint16_t((messageRx.data[3] * 256) + messageRx.data[4]) * 0.05; + + #if (DEBUGMODE==1) + printMessage(&messageRx); + #endif + } + + return data; + +} + + +/*********************************************************************** + CAN in Automation (CiA) + ***********************************************************************/ + +//Request information through OBD +void CAN::CiARequest(uint8_t PID) +{ + messageTx.id = ID_QUERY; + messageTx.header.rtr = 0; + messageTx.header.length = 8; + messageTx.data[0]= 0x02; + messageTx.data[1]= 0x01; + messageTx.data[2]= PID; + + + sendMessage(&messageTx); + delay(5); + + if (messageAvailable()) { + //Read the message buffers + getMessage(&messageRx); + } + +} + + +/*********************************************************************** + * PRIVATE METHODS + ***********************************************************************/ + +//Write a MCP2515 register +void CAN::writeRegister( char direction, char data ) +{ + //CS low to select the MCP2515 + Utils.setCSSocket0(); + + SPI.transfer(SPI_WRITE); + SPI.transfer(direction); + SPI.transfer(data); + + //CS line again to release + Utils.unsetCSSocket0(); +} + + +//********************************************************************** + +//Read a MCP2515 register +char CAN::readRegister(char direction) +{ + char data; + + //CS low to select the MCP2515 + Utils.setCSSocket0(); + + SPI.transfer(SPI_READ); + SPI.transfer(direction); + //Read data SPI + data = SPI.transfer(0xff); + + //CS line again to release + Utils.unsetCSSocket0(); + + return data; +} + + +//*********************************************************************** + +//Modify a bit of the MCP2515 registers +void CAN::bitModify(char direction, char mask, char data) +{ + //CS low to select the MCP2515 + Utils.setCSSocket0(); + + SPI.transfer(SPI_BIT_MODIFY); + SPI.transfer(direction); + SPI.transfer(mask); + SPI.transfer(data); + + //CS line again to release + Utils.unsetCSSocket0(); +} + + +//*********************************************************************** + +//Check the status of the MCP2515 registers (SPI_RX_STATUS / SPI_READ_STATUS) +char CAN::readStatus(char type) +{ + char data; + + //CS low to select the MCP2515 + Utils.setCSSocket0(); + + SPI.transfer(type); + //Read data SPI + data = SPI.transfer(0xFF); + + //CS line again to release + Utils.unsetCSSocket0(); + + return data; +} + + +//*********************************************************************** + +//Check if the buffers are empty +bool CAN::checkFreeBuffer(void) +{ + char status = readStatus(SPI_READ_STATUS); + + + if ((status & 0x54) == 0x54) + { + //All buffers used + return false; + } + + return true; +} + + +//*********************************************************************** + +//Reset MCP2515 +void CAN::reset(void) +{ + //CS low to select the MCP2515 + Utils.setCSSocket0(); + + SPI.transfer(SPI_RESET); + //CS line again to release + Utils.unsetCSSocket0(); + + + //Wait a bit to be stabilized after the reset MCP2515 + delay(10); + + #if (DEBUGMODE==1) + Serial.println("The MCP2515 has been successfully reset, configuration mode activated"); + #endif +} + +