Vehicle Diagnostics rev_16

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    - Project: Vehicle Diagnostics
    - Source Code NOT compiled for: Arduino Mega
    - Source Code created on: 2025-07-11 22:03:20

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* send data from bluetooth to android */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
float T_interpolate(byte DS_Temp); // Added prototype for T_interpolate function

/***** DEFINITION OF Software Serial *****/
const uint8_t HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_TX_A0 = A0;
const uint8_t HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial HC05_Bluetooth_Module_HC05_mySerial(HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_RX_A1, HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_TX_A0);

void setup(void)
{
  // Initialize Bluetooth serial communication
  HC05_Bluetooth_Module_HC05_mySerial.begin(9600);
}

void loop(void)
{
  // *** USER CODE START ***
  // Variables for user code
  const byte ALDLTestPin = 4; // Input used to listen for 160 BAUD ALDL activity before commanding 8192 BAUD
  const byte DecodeDataOutputPin = 5; // Input pin for decoded data output control
  const byte HexDataOutputPin = 6; // Input pin for hex data output control

  int ALDLbyte = 0; // One byte of ALDL data
  int bytecounter = 0; // count bytes for line spacing in output
  const int linecount = 64; // 32 bytes per line
  byte M1Cmd[4] = {0x80, 0x56, 0x01, 0x29}; // Mode 1 command to start 8192 Mode 1 DataStream (80 56 01 29 HEX)
  byte Preamble[3] = {0x80, 0x95, 0x01}; // Preamble from ECM indicates start of 8192 Mode 1 DataStream (80 95 01 HEX)
  bool PreambleFound = false; // Reset preamble found flag
  bool SilenceFound = false; // Flag to indicate ECM silence in 160 baud mode
  bool CommInit8192 = false; // Flag for 8192 baud communication
  const double SilenceWait = 15000; // Minimum silence period before transmitting Mode 1 command (ms)
  unsigned long PreambleTimer; // Timeout timer for preamble
  const int ByteCount = 64; // Number of data bytes following preamble
  byte DataBytes[ByteCount]; // Array to hold serial data stream
  int DataStreamIndex = 1; // Data stream byte index
  int i = 0; // Preamble index counter
  unsigned long StartTime; // Timer for measuring incoming data
  unsigned int CheckTotal; // Total for checksum calculation
  byte CheckSum; // Calculated checksum

  // Variables for decoded data
  float RPM = 0;
  float TPS = 0;
  float MAF = 0;
  float InjPW = 0;
  float O2mv = 0;
  int BLCELL = 0;
  int BLM = 0;
  int INTEGRATOR = 0;
  float MAT = 0;
  unsigned int Runtime = 0;

  // *** Wait for silence on ALDL line
  Serial.print("wait for silence ");
  SilenceFound = false;
  StartTime = micros();
  while ((micros() - StartTime) < 15000) // wait 15ms for silence
  {
    if (digitalRead(ALDLTestPin) == 0)
    {
      StartTime = micros(); // reset timer if activity detected
    }
  }
  SilenceFound = true;

  while (SilenceFound)
  {
    // Send Mode 1 command over Bluetooth serial
    PreambleFound = false;
    while (!PreambleFound)
    {
      Serial.print(" M1 cmd ");
      i = 0;
      while (i < 4)
      {
        Serial1.write(M1Cmd[i]);
        i++;
      }
      Serial.println(" Finding Preamble ");
      i = 0;
      PreambleTimer = millis();
      while ((millis() - PreambleTimer) < 100 && !PreambleFound)
      {
        if (Serial1.available() > 0)
        {
          ALDLbyte = Serial1.read();
          if (ALDLbyte == Preamble[i])
          {
            i++;
            if (i > 2) PreambleFound = true;
          }
          else
          {
            PreambleFound = false;
            i = 0;
          }
        }
      }
    }

    // Read data stream after preamble
    DataStreamIndex = 1;
    while (DataStreamIndex < 65)
    {
      if (Serial1.available() > 0)
      {
        DataBytes[DataStreamIndex] = Serial1.read();
        DataStreamIndex++;
      }
    }

    // Calculate checksum
    i = 1;
    CheckTotal = 0x80 + 0x95 + 0x01; // sum preamble bytes
    while (i < ByteCount)
    {
      CheckTotal += DataBytes[i];
      i++;
    }
    CheckSum = 0x200 - CheckTotal; // two's complement

    // Send data to serial port based on control pins
    if (digitalRead(DecodeDataOutputPin) == LOW)
    {
      // Output decoded data
      Serial.print("New Data Stream received at ");
      Serial.print(millis());
      Serial.print(" Calc CHECKSUM: ");
      Serial.print(CheckSum, HEX);
      Serial.print(" Transmitted CHECKSUM: ");
      Serial.print(DataBytes[63], HEX); // last byte
      if (CheckSum == DataBytes[63])
        Serial.println(" Checksum GOOD - Decoded Data as follows:   (Page 1) ");
      else
        Serial.println(" Checksum *** ERROR *** -  Decoded Data as follows:   (Page 1) ");

      // Parse data bytes
      RPM = DataBytes[11] * 25; // RPM
      TPS = DataBytes[10] * 0.019608; // TPS volts
      MAF = ((DataBytes[36] * 256) + DataBytes[37]) * 0.003906; // MAF gm/sec
      BLCELL = DataBytes[21];
      BLM = DataBytes[20];
      INTEGRATOR = DataBytes[22];
      InjPW = ((DataBytes[45] * 256) + DataBytes[46]) * 0.015259; // ms
      O2mv = DataBytes[17] * 4.44; // mV
      MAT = T_interpolate(DataBytes[30]);
      Runtime = (DataBytes[52] * 256) + DataBytes[53];

      // Display data
      Serial.print("Engine Speed     : ");
      Serial.print(RPM);
      Serial.println(" RPM");
      Serial.print("Throttle Position: ");
      Serial.print(TPS);
      Serial.println(" Volts");
      Serial.print("Mass Air Flow    : ");
      Serial.print(MAF);
      Serial.println(" Grams/Sec");
      Serial.print("Current BLM Cell: ");
      Serial.print(BLCELL);
      Serial.print(" BLM Value: ");
      Serial.print(BLM);
      Serial.print("  Current Fuel Integrator: ");
      Serial.println(INTEGRATOR);
      Serial.print("Injector Pulse   : ");
      Serial.print(InjPW);
      Serial.println(" Milliseconds");
      Serial.print("O2 Sensor Voltage: ");
      Serial.print(O2mv);
      Serial.println(" Millivolts");
      Serial.print("Intake Air Temp  : ");
      Serial.print(MAT);
      Serial.println(" Deg C");
      Serial.print("Engine Run Time  : ");
      Serial.print(Runtime);
      Serial.println(" Seconds");

      // Delay for user reading
      unsigned long StartTimeDelay = millis();
      while (millis() < StartTimeDelay + 3000)
      {
        if (Serial1.available() > 0) ALDLbyte = Serial1.read(); // flush buffer
      }
    }
    else if (digitalRead(HexDataOutputPin) == LOW)
    {
      // Output hex data
      Serial.print("New Data Stream received at ");
      Serial.print(millis());
      Serial.print(" Calc CHECKSUM: ");
      Serial.print(CheckSum, HEX);
      Serial.print(" Transmitted CHECKSUM: ");
      Serial.print(DataBytes[63], HEX);
      if (CheckSum == DataBytes[63])
        Serial.println(" Checksum GOOD - Data as follows: ");
      else
        Serial.println(" Checksum *** ERROR *** -  Data as follows: ");

      int j = 1;
      bytecounter = 0;
      while (j < ByteCount + 1)
      {
        Serial.print(DataBytes[j], HEX);
        j++;
        bytecounter++;
        if (bytecounter >= linecount)
        {
          bytecounter = 0;
          Serial.println();
        }
        else
        {
          Serial.print(" ");
        }
      }
      Serial.println();
    }
    else
    {
      // Send raw data stream over Bluetooth serial
      Serial.write(0x80);
      Serial.write(0x95);
      Serial.write(0x01);
      for (int j = 1; j < ByteCount + 1; j++)
      {
        Serial.write(DataBytes[j]);
      }
    }
  }
}

// Implementation of T_interpolate function
float T_interpolate(byte DS_Temp)
{
  const float TempScale[38] = {1, 5, 6, 9, 11, 15, 19, 25, 31, 38, 47, 57, 67, 79, 91, 104, 117, 130, 142, 154, 164, 175, 184, 192, 200, 206, 212, 217, 222, 226, 230, 233, 235, 238, 240, 242, 244, 256};
  const float TempValue[38] = {-40, -30, -25, -20, -15, -10, -5, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 200};
  float T_Range, T_Diff, TempRange, Temperature;
  int i = 0;
  while (i < 38)
  {
    if (TempScale[i] > DS_Temp) break;
    i++;
  }
  if (i > 0)
  {
    T_Range = TempScale[i] - TempScale[i - 1];
    T_Diff = DS_Temp - TempScale[i - 1];
    TempRange = TempValue[i] - TempValue[i - 1];
    Temperature = TempValue[i - 1] + (T_Diff / T_Range) * TempRange;
  }
  else
  {
    Temperature = TempValue[0];
  }
  return Temperature;
}
// *** USER CODE END ***

}