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	- Project: "Arduino Setup+"
	- Source Code compiled for: Arduino Pro Mini 5V
	- Source Code created on: 2023-12-22 12:22:37

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Check if digital data is received from bluetooth */
	/* and and use this data into MCP4725. */
/****** SYSTEM REQUIREMENT 2 *****/
	/* Read currentAcquisition and send it via bluetooth. */
	/* The data to be send has to be integer. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Arduino.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <Adafruit_MCP4725.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateInputs(void);
void convertInputsFromRawToPhyData(void);

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t currentAcquisition_PIN_A0 = A0;

/***** DEFINITION OF Software Serial *****/
const uint8_t DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_TX_A1 = A1;
const uint8_t DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_RX_A2 = A2;
SoftwareSerial DX_BT27_Slave_HC05_mySerial(DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_RX_A2, DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_TX_A1);

/***** DEFINITION OF I2C PINS *****/
const uint8_t MCP4725_PIN_SDA_A4 = A4;
const uint8_t MCP4725_PIN_SCL_A5 = A5;

/****** DEFINITION OF ANALOG INPUTS CHARACTERISTIC CURVES *****/
const uint8_t SEGMENT_POINTS_voltage_Current_PIN_A0 = 2;
const float voltage_Current_PIN_A0_lookup[2][SEGMENT_POINTS_voltage_Current_PIN_A0] = {
  {0.0, 5.0},  //Voltage [V]
  {0.0, 500.0} //Current [A]
};

/***** DEFINITION OF INPUT RAW VARIABLES *****/
/***** used to store raw data *****/
unsigned int currentAcquisition_PIN_A0_rawData = 0; // Analog Input

/***** DEFINITION OF INPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float currentAcquisition_PIN_A0_phyData = 0.0; // Current [A]

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
Adafruit_MCP4725 dac;

void setup(void) {
  // put your setup code here, to run once:

  pinMode(currentAcquisition_PIN_A0, INPUT);

  DX_BT27_Slave_HC05_mySerial.begin(9600);

  dac.begin(MCP4725_I2CADDR_DEFAULT, &Wire); // Initialize DAC with default I2C address and Wire object
}

void loop(void) {
  // put your main code here, to run repeatedly:

  updateInputs(); // Refresh input data

  convertInputsFromRawToPhyData(); // after that updateInput function is called, so raw data are transformed into physical data according to the characteristic curve

  // Check if digital data is received from bluetooth and use this data into MCP4725
  if (DX_BT27_Slave_HC05_mySerial.available()) {
    int data = DX_BT27_Slave_HC05_mySerial.parseInt();
    dac.setVoltage(data, true); // Set the voltage output of the DAC and write to EEPROM
  }

  // Read currentAcquisition and send it via bluetooth
  int currentAcquisitionInt = (int)currentAcquisition_PIN_A0_phyData;
  DX_BT27_Slave_HC05_mySerial.println(currentAcquisitionInt);
}

void updateInputs() {
  currentAcquisition_PIN_A0_rawData = analogRead(currentAcquisition_PIN_A0);
}

/* BLOCK lookup_phyData_from_voltage */
float lookup_phyData_from_voltage(float voltage, int segment_points, const float* voltage_phyData_lookup)
{
	// Search table for appropriate value.
	uint8_t index = 0;

	const float *voltagePointer = &voltage_phyData_lookup[0];
	const float *phyDataPointer = &voltage_phyData_lookup[segment_points];

	// Perform minimum and maximum voltage saturation based on characteristic curve
	voltage = min(voltage, voltagePointer[segment_points-1]);
	voltage = max(voltage, voltagePointer[0]);

	while( voltagePointer[index] <= voltage && index < segment_points )
		index++;

	// If index is zero, physical value is smaller than our table range
	if( index==0 )
	{
		return map_f( voltage,
			voltagePointer[0],   // X1
			voltagePointer[1],   // X2
			phyDataPointer[0],   // Y1
			phyDataPointer[1] ); // Y2
	}
	// If index is maxed out, phyisical value is larger than our range.
	else if( index==segment_points )
	{
		return map_f( voltage,
			voltagePointer[segment_points-2],   // X1
			voltagePointer[segment_points-1],   // X2
			phyDataPointer[segment_points-2],   // Y1
			phyDataPointer[segment_points-1] ); // Y2
	}
	// index is between 0 and max, just right
	else
	{
		return map_f( voltage,
			voltagePointer[index-1], // X1
			voltagePointer[index],    // X2
			phyDataPointer[index-1], // Y1
			phyDataPointer[index] );  // Y2
	}
}
/* END BLOCK lookup_phyData_from_voltage */

/* BLOCK map_f */
float map_f(float x, float in_min, float in_max, float out_min, float out_max)
{
	return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
/* END BLOCK map_f */

/* BLOCK convertInputsFromRawToPhyData */
void convertInputsFromRawToPhyData()
{
	float voltage = 0.0;

	voltage = currentAcquisition_PIN_A0_rawData * (5.0 / 1023.0);
	currentAcquisition_PIN_A0_phyData = lookup_phyData_from_voltage(voltage, SEGMENT_POINTS_voltage_Current_PIN_A0, &(voltage_Current_PIN_A0_lookup[0][0]));

}
/* END BLOCK convertInputsFromRawToPhyData */