speeduino/utils.ino

/*
Speeduino - Simple engine management for the Arduino Mega 2560 platform
Copyright (C) Josh Stewart
A full copy of the license may be found in the projects root directory
*/


/*
Returns how much free dynamic memory exists (between heap and stack)
*/
#include "utils.h"

int freeRam ()
{
  extern int __heap_start, *__brkval;
  int v;
  return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}

void setPinMapping(byte boardID)
{
  switch (boardID)
  {
    case 0:
      //Pin mappings as per the v0.1 shield
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 11; //Output pin injector 3 is on
      pinInjector4 = 10; //Output pin injector 4 is on
      pinCoil1 = 6; //Pin for coil 1
      pinCoil2 = 7; //Pin for coil 2
      pinCoil3 = 12; //Pin for coil 3
      pinCoil4 = 13; //Pin for coil 4
      pinTrigger = 2; //The CAS pin
      pinTPS = A0; //TPS input pin
      pinMAP = A1; //MAP sensor pin
      pinIAT = A2; //IAT sensor pin
      pinCLT = A3; //CLS sensor pin
      pinO2 = A4; //O2 Sensor pin
      break;
    case 1:
      //Pin mappings as per the v0.2 shield
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 10; //Output pin injector 3 is on
      pinInjector4 = 11; //Output pin injector 4 is on
      pinCoil1 = 28; //Pin for coil 1
      pinCoil2 = 24; //Pin for coil 2
      pinCoil3 = 40; //Pin for coil 3
      pinCoil4 = 36; //Pin for coil 4
      pinTrigger = 20; //The CAS pin
      pinTrigger2 = 21; //The Cam Sensor pin
      pinTPS = A2; //TPS input pin
      pinMAP = A3; //MAP sensor pin
      pinIAT = A0; //IAT sensor pin
      pinCLT = A1; //CLS sensor pin
      pinO2 = A8; //O2 Sensor pin
      pinBat = A4; //Battery reference voltage pin
      pinDisplayReset = 48; // OLED reset pin
      break;
    case 2:
      //Pin mappings as per the v0.3 shield
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 10; //Output pin injector 3 is on
      pinInjector4 = 11; //Output pin injector 4 is on
      pinCoil1 = 28; //Pin for coil 1
      pinCoil2 = 24; //Pin for coil 2
      pinCoil3 = 40; //Pin for coil 3
      pinCoil4 = 36; //Pin for coil 4
      pinTrigger = 19; //The CAS pin
      pinTrigger2 = 18; //The Cam Sensor pin
      pinTPS = A2;//TPS input pin
      pinMAP = A3; //MAP sensor pin
      pinIAT = A0; //IAT sensor pin
      pinCLT = A1; //CLS sensor pin
      pinO2 = A8; //O2 Sensor pin
      pinBat = A4; //Battery reference voltage pin
      pinDisplayReset = 48; // OLED reset pin
      pinTachOut = 49; //Tacho output pin
      pinIdle1 = 5; //Single wire idle control
      pinFuelPump = 4; //Fuel pump output

      break;

    case 3:
      //Pin mappings as per the v0.4 shield
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 10; //Output pin injector 3 is on
      pinInjector4 = 11; //Output pin injector 4 is on
      pinCoil1 = 40; //Pin for coil 1
      pinCoil2 = 38; //Pin for coil 2
      pinCoil3 = 52; //Pin for coil 3
      pinCoil4 = 50; //Pin for coil 4
      pinTrigger = 19; //The CAS pin
      pinTrigger2 = 18; //The Cam Sensor pin
      pinTPS = A2;//TPS input pin
      pinMAP = A3; //MAP sensor pin
      pinIAT = A0; //IAT sensor pin
      pinCLT = A1; //CLS sensor pin
      pinO2 = A8; //O2 Sensor pin
      pinBat = A4; //Battery reference voltage pin
      pinDisplayReset = 48; // OLED reset pin
      pinTachOut = 49; //Tacho output pin
      pinIdle1 = 5; //Single wire idle control
      pinFuelPump = 45; //Fuel pump output
      pinStepperDir = 16; //Direction pin  for DRV8825 driver
      pinStepperStep = 17; //Step pin for DRV8825 driver
      break;

    case 10:
      //Pin mappings for user turtanas PCB
      pinInjector1 = 4; //Output pin injector 1 is on
      pinInjector2 = 5; //Output pin injector 2 is on
      pinInjector3 = 6; //Output pin injector 3 is on
      pinInjector4 = 7; //Output pin injector 4 is on
      pinInjector5 = 8; //Placeholder only - NOT USED
      pinInjector6 = 9; //Placeholder only - NOT USED
      pinInjector7 = 10; //Placeholder only - NOT USED
      pinInjector8 = 11; //Placeholder only - NOT USED
      pinCoil1 = 24; //Pin for coil 1
      pinCoil2 = 28; //Pin for coil 2
      pinCoil3 = 36; //Pin for coil 3
      pinCoil4 = 40; //Pin for coil 4
      pinTrigger = 18; //The CAS pin
      pinTrigger2 = 19; //The Cam Sensor pin
      pinTPS = A2;//TPS input pin
      pinMAP = A3; //MAP sensor pin
      pinMAP2 = A8; //MAP2 sensor pin
      pinIAT = A0; //IAT sensor pin
      pinCLT = A1; //CLS sensor pin
      pinO2 = A4; //O2 Sensor pin
      pinBat = A7; //Battery reference voltage pin
      pinDisplayReset = 48; // OLED reset pin
      pinSpareTemp1 = A6;
      pinSpareTemp2 = A5;
      pinTachOut = 41; //Tacho output pin transistori puuttuu 2n2222 tähän ja 1k 12v
      pinFuelPump = 42; //Fuel pump output 2n2222
      break;

    case 20:
      //Pin mappings as per the Plazomat In/Out shields Rev 0.1
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 10; //Output pin injector 3 is on
      pinInjector4 = 11; //Output pin injector 4 is on
      pinCoil1 = 28; //Pin for coil 1
      pinCoil2 = 24; //Pin for coil 2
      pinCoil3 = 40; //Pin for coil 3
      pinCoil4 = 36; //Pin for coil 4
      pinSpareOut1 = 4; //Spare LSD Output 1(PWM)
      pinSpareOut2 = 5; //Spare LSD Output 2(PWM)
      pinSpareOut3 = 6; //Spare LSD Output 3(PWM)
      pinSpareOut4 = 7; //Spare LSD Output 4(PWM)
      pinSpareOut5 = 50; //Spare LSD Output 5(digital)
      pinSpareOut6 = 52; //Spare LSD Output 6(digital)
      pinTrigger = 20; //The CAS pin
      pinTrigger2 = 21; //The Cam Sensor pin
      pinSpareTemp2 = A15; //spare Analog input 2
      pinSpareTemp1 = A14; //spare Analog input 1
      pinO2 = A8; //O2 Sensor pin
      pinBat = A4; //Battery reference voltage pin
      pinMAP = A3; //MAP sensor pin
      pinTPS = A2;//TPS input pin
      pinCLT = A1; //CLS sensor pin
      pinIAT = A0; //IAT sensor pin

    case 30:
      //Pin mappings as per the dazv6 shield
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 10; //Output pin injector 3 is on
      pinInjector4 = 11; //Output pin injector 4 is on
      //pinInjector5 = 12; //Placeholder only - NOT USED
      //pinInjector6 = 13; //Placeholder only - NOT USED
      pinCoil1 = 40; //Pin for coil 1
      pinCoil2 = 38; //Pin for coil 2
      pinCoil3 = 50; //Pin for coil 3
      pinCoil4 = 52; //Pin for coil 4
      pinTrigger = 19; //The CAS pin
      pinTrigger2 = 18; //The Cam Sensor pin
      pinTrigger3 = 17; // cam sensor 2 pin
      pinTPS = A2;//TPS input pin
      pinMAP = A3; //MAP sensor pin
      pinIAT = A0; //IAT sensor pin
      pinCLT = A1; //CLS sensor pin
      pinO2 = A8; //O2 Sensor pin
      pinO2_2 = A9; //O2 sensor pin (second sensor)
      pinBat = A4; //Battery reference voltage pin
      pinDisplayReset = 48; // OLED reset pin
      pinTachOut = 49; //Tacho output pin
      pinIdle1 = 5; //Single wire idle control
      pinFuelPump = 45; //Fuel pump output
      pinSpareHOut1 = 4; // high current output spare1
      pinSpareHOut2 = 6; // high current output spare2
      pinBoost = 7;
      pinSpareLOut1 = 43; //low current output spare1
      pinSpareLOut2 = 47;
      pinSpareLOut3 = 49;
      pinSpareLOut4 = 51;
      pinSpareLOut5 = 53;
      break; 
      
    default:
      //Pin mappings as per the v0.2 shield
      pinInjector1 = 8; //Output pin injector 1 is on
      pinInjector2 = 9; //Output pin injector 2 is on
      pinInjector3 = 10; //Output pin injector 3 is on
      pinInjector4 = 11; //Output pin injector 4 is on
      pinCoil1 = 28; //Pin for coil 1
      pinCoil2 = 24; //Pin for coil 2
      pinCoil3 = 40; //Pin for coil 3
      pinCoil4 = 36; //Pin for coil 4
      pinTrigger = 20; //The CAS pin
      pinTrigger2 = 21; //The Cam Sensor pin
      pinTPS = A2; //TPS input pin
      pinMAP = A3; //MAP sensor pin
      pinIAT = A0; //IAT sensor pin
      pinCLT = A1; //CLS sensor pin
      pinO2 = A8; //O2 Sensor pin
      pinBat = A4; //Battery reference voltage pin
      pinDisplayReset = 48; // OLED reset pin
      break;
  }
  
  

  //Finally, set the relevant pin modes for outputs
  pinMode(pinCoil1, OUTPUT);
  pinMode(pinCoil2, OUTPUT);
  pinMode(pinCoil3, OUTPUT);
  pinMode(pinCoil4, OUTPUT);
  pinMode(pinInjector1, OUTPUT);
  pinMode(pinInjector2, OUTPUT);
  pinMode(pinInjector3, OUTPUT);
  pinMode(pinInjector4, OUTPUT);
  pinMode(pinTachOut, OUTPUT);
  pinMode(pinIdle1, OUTPUT);
  pinMode(pinIdle2, OUTPUT);
  pinMode(pinFuelPump, OUTPUT);
  pinMode(pinLaunch, INPUT_PULLUP);
  
  inj1_pin_port = portOutputRegister(digitalPinToPort(pinInjector1));
  inj1_pin_mask = digitalPinToBitMask(pinInjector1);
  inj2_pin_port = portOutputRegister(digitalPinToPort(pinInjector2));
  inj2_pin_mask = digitalPinToBitMask(pinInjector2);
  inj3_pin_port = portOutputRegister(digitalPinToPort(pinInjector3));
  inj3_pin_mask = digitalPinToBitMask(pinInjector3);
  inj4_pin_port = portOutputRegister(digitalPinToPort(pinInjector4));
  inj4_pin_mask = digitalPinToBitMask(pinInjector4);

  //And for inputs
  pinMode(pinMAP, INPUT);
  pinMode(pinO2, INPUT);
  pinMode(pinO2_2, INPUT);
  pinMode(pinTPS, INPUT);
  pinMode(pinIAT, INPUT);
  pinMode(pinCLT, INPUT);
  pinMode(pinBat, INPUT);
  pinMode(pinTrigger, INPUT);
  pinMode(pinTrigger2, INPUT);
  pinMode(pinTrigger3, INPUT);
  //
  digitalWrite(pinMAP, HIGH);
  //digitalWrite(pinO2, LOW);
  digitalWrite(pinTPS, LOW);
}

/*
This function retuns a pulsewidth time (in us) using a either Alpha-N or Speed Density algorithms, given the following:
REQ_FUEL
VE: Lookup from the main MAP vs RPM fuel table
MAP: In KPa, read from the sensor
GammaE: Sum of Enrichment factors (Cold start, acceleration). This is a multiplication factor (Eg to add 10%, this should be 110)
injDT: Injector dead time. The time the injector take to open minus the time it takes to close (Both in uS)
TPS: Throttle position (0% to 100%)

This function is called by PW_SD and PW_AN for speed0density and pure Alpha-N calculations respectively.
*/
unsigned int PW(int REQ_FUEL, byte VE, byte MAP, int corrections, int injOpen, byte TPS)
{
  //Standard float version of the calculation
  //return (REQ_FUEL * (float)(VE/100.0) * (float)(MAP/100.0) * (float)(TPS/100.0) * (float)(corrections/100.0) + injOpen);
  //Note: The MAP and TPS portions are currently disabled, we use VE and corrections only

  //100% float free version, does sacrifice a little bit of accuracy.
  int iVE = ((int)VE << 7) / 100;
  //int iVE = divs100( ((int)VE << 7));
  //int iMAP = ((int)MAP << 7) / 100;
  int iCorrections = (corrections << 7) / 100;
  //int iTPS = ((int)TPS << 7) / 100;

  unsigned long intermediate = ((long)REQ_FUEL * (long)iVE) >> 7; //Need to use an intermediate value to avoid overflowing the long
  //intermediate = (intermediate * iMAP) >> 7;
  intermediate = (intermediate * iCorrections) >> 7;
  //intermediate = (intermediate * iTPS) >> 7;
  intermediate += injOpen; //Add the injector opening time
  if ( intermediate > 65535) {
    intermediate = 65535;  //Make sure this won't overflow when we convert to uInt. This means the maximum pulsewidth possible is 65.535mS
  }
  return (unsigned int)(intermediate);

}

//Convenience functions for Speed Density and Alpha-N
unsigned int PW_SD(int REQ_FUEL, byte VE, byte MAP, int corrections, int injOpen)
{
  //return PW(REQ_FUEL, VE, MAP, corrections, injOpen, 100); //Just use 1 in place of the TPS
  return PW(REQ_FUEL, VE, 100, corrections, injOpen, 100); //Just use 1 in place of the TPS
}

unsigned int PW_AN(int REQ_FUEL, byte VE, byte TPS, int corrections, int injOpen)
{
  //Sanity check
  if(TPS > 100) { TPS = 100; }
  //return PW(REQ_FUEL, VE, 100, corrections, injOpen, TPS); //Just use 1 in place of the MAP
  return PW(REQ_FUEL, VE, 100, corrections, injOpen, 100); //Just use 1 in place of the MAP
}