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	- Project: "Arduino GSM"
	- Source Code compiled for: Arduino Pro Mini 5V
	- Source Code created on: 2024-06-13 11:06:09

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Develop a system to control a SIM800L GSM module */
	/* using an Arduino. The system should handle */
	/* incoming calls via the RING pin and manage power */
	/* states using the RST and DTR pins. Communication */
	/* occurs over SoftwareSerial on pins A0 and A1. */
/****** END SYSTEM REQUIREMENTS *****/


/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h>
#include <Sim800L.h> // https://github.com/vittorioexp/Sim800L-Arduino-Library-revised

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t tre_SIM800L_RING_PIN_D3 = 3;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t tre_SIM800L_RST_PIN_D2 = 2;
const uint8_t tre_SIM800L_DTR_PIN_D4 = 4;

/***** DEFINITION OF Software Serial *****/
const uint8_t tre_SIM800L_Serial_PIN_SERIAL_TX_A0 = A0;
const uint8_t tre_SIM800L_Serial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial tre_SIM800L_Serial(tre_SIM800L_Serial_PIN_SERIAL_RX_A1, tre_SIM800L_Serial_PIN_SERIAL_TX_A0);

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool tre_SIM800L_RST_PIN_D2_rawData = 0;
bool tre_SIM800L_DTR_PIN_D4_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float tre_SIM800L_RST_PIN_D2_phyData = 0.0;
float tre_SIM800L_DTR_PIN_D4_phyData = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
Sim800L GSM(&tre_SIM800L_Serial, tre_SIM800L_RST_PIN_D2, tre_SIM800L_DTR_PIN_D4, tre_SIM800L_RING_PIN_D3);

void setup(void) {
  // Initialize serial communication for debugging
  Serial.begin(9600);

  // Set pin modes
  pinMode(tre_SIM800L_RING_PIN_D3, INPUT_PULLUP);
  pinMode(tre_SIM800L_RST_PIN_D2, OUTPUT);
  pinMode(tre_SIM800L_DTR_PIN_D4, OUTPUT);

  // Initialize the software serial for GSM communication
  tre_SIM800L_Serial.begin(9600);

  // Initialize the GSM module
  GSM.begin(4800);

  // Set minimum functionality mode
  if (!GSM.setFunctionalityMode(0)) Serial.println("ERROR");
  else Serial.println("Minimum functionality");

  Serial.print("Functionality mode: ");
  Serial.println(GSM.getFunctionalityMode());
  delay(5000);

  // Set full functionality mode
  if (!GSM.setFunctionalityMode(1)) Serial.println("ERROR");
  else Serial.println("Full functionality");

  Serial.print("Functionality mode: ");
  Serial.println(GSM.getFunctionalityMode());
  delay(5000);

  // Set flight mode (disable RF function)
  if (!GSM.setFunctionalityMode(4)) Serial.println("ERROR");
  else Serial.println("Flight mode (disable RF function)");

  Serial.print("Functionality mode: ");
  Serial.println(GSM.getFunctionalityMode());
  delay(5000);
}

void loop(void) {
  // Refresh output data
  updateOutputs();

  // Check for incoming calls via the RING pin
  if (digitalRead(tre_SIM800L_RING_PIN_D3) == LOW) {
    Serial.println("Incoming call detected!");
    // Handle the incoming call as needed
  }
}

void updateOutputs() {
  // Update the output pins with the raw data
  digitalWrite(tre_SIM800L_RST_PIN_D2, tre_SIM800L_RST_PIN_D2_rawData);
  digitalWrite(tre_SIM800L_DTR_PIN_D4, tre_SIM800L_DTR_PIN_D4_rawData);
}

/* END CODE */