Network Operations rev_05

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    - Project: Network Operations
    - Source Code NOT compiled for: Arduino Nano 33 BLE
    - Source Code created on: 2025-06-20 08:02:48

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Detect and initialize the Ethernet connection */
    /* using the Ethernet2 library and the W5500 module. */
    /* Retrieve and display the assigned IP address to */
    /* confirm successful connection. */
/****** SYSTEM REQUIREMENT 2 *****/
    /* Monitor and read all channels connected via the */
    /* PCF8575 I2C expander periodically, ensuring real- */
    /* time data acquisition from the digital inputs. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SPI.h>
#include <Wire.h>
#include <Ethernet2.h>    //https://github.com/adafruit/Ethernet2
#include <PCF8575.h>      //https://github.com/RobTillaart/PCF8575.git
#include <DFRobot_ADS1115.h> //https://github.com/DFRobot/DFRobot_ADS1115

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

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t ethernet_W5500_RST_PIN_D2 = 2;

/***** DEFINITION OF I2C PINS *****/
const uint8_t pdf_PCF8575_I2C_PIN_SDA_A4 = A4;
const uint8_t pdf_PCF8575_I2C_PIN_SCL_A5 = A5;
const uint8_t pdf_PCF8575_I2C_SLAVE_ADDRESS = 32;
const uint8_t adc_ADS1115_I2C_PIN_SDA_A4 = A4;
const uint8_t adc_ADS1115_I2C_PIN_SCL_A5 = A5;
const uint8_t adc_ADS1115_I2C_SLAVE_ADDRESS = 72;

/***** DEFINITION OF SPI PINS *****/
const uint8_t ethernet_W5500_SPI_PIN_MOSI_D11 = 11;
const uint8_t ethernet_W5500_SPI_PIN_MISO_D12 = 12;
const uint8_t ethernet_W5500_SPI_PIN_SCLK_D13 = 13;
const uint8_t ethernet_W5500_SPI_PIN_CS_D10 = 10;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool ethernet_W5500_RST_PIN_D2_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float ethernet_W5500_RST_PIN_D2_phyData = 0.0;

/****** LIBRARY CLASS INSTANCES *****/
EthernetClass Ethernet; // Ethernet object
PCF8575 pcf8575(pdf_PCF8575_I2C_SLAVE_ADDRESS); // PCF8575 expander
// Add ADS1115 object if needed
DFRobot_ADS1115 ads1115; // ADS1115 ADC

unsigned long previousMillis = 0;
const long interval = 1000; // 1 second interval for periodic reading

void setup(void)
{
  // Initialize serial communication for debugging
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // Initialize Ethernet
  initializeEthernet();

  // Initialize pins
  pinMode(ethernet_W5500_RST_PIN_D2, OUTPUT);
  pinMode(ethernet_W5500_SPI_PIN_CS_D10, OUTPUT);
  // start the SPI library:
  SPI.begin();

  // Initialize I2C
  Wire.begin();

  // Initialize PCF8575
  pcf8575.begin();

  // Initialize ADS1115 if needed
  // ads1115.initialize(); // Uncomment if ADS1115 is used

}

void loop(void)
{
  // Maintain Ethernet connection
  Ethernet.maintain();

  // Periodically read all channels
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    readAllChannels();
  }

  // Update outputs
  updateOutputs();
}

void updateOutputs()
{
  digitalWrite(ethernet_W5500_RST_PIN_D2, ethernet_W5500_RST_PIN_D2_rawData);
}

void initializeEthernet()
{
  // Use DHCP to get IP address
  int result = Ethernet.begin();
  if (result == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // fallback or error handling
  } else {
    Serial.print("Ethernet IP Address: ");
    Serial.println(Ethernet.localIP());
  }
}

void readAllChannels()
{
  // Read all digital inputs from PCF8575
  uint16_t inputStates = pcf8575.read16();
  Serial.print("PCF8575 Inputs: ");
  Serial.println(inputStates, BIN);
}