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// IVT-S meter using Arduino Uno R4 WiFi built-in CAN controller
// Reads both Current and Voltage from IVT-S sensor

#include <Arduino_CAN.h>

// IVT-S CAN message IDs (check your documentation to confirm)
static const uint32_t IVT_CURRENT_ID = 0x521;   // Current message ID
static const uint32_t IVT_VOLTAGE_ID = 0x522;   // Voltage message ID (common alternative: 0x522)

// Variables to store readings
int32_t current_ma = 0;
int32_t voltage_mv = 0;
unsigned long lastUpdate = 0;

void setup() {
  Serial.begin(115200);
  while (!Serial) delay(10);
  
  Serial.println("Initializing CAN at 500kbps...");

  if (!CAN.begin(CanBitRate::BR_500k)) {
    Serial.println("Failed to initialize built-in CAN controller!");
    while (1) delay(1000);
  }
  Serial.println("Built-in CAN controller initialized at 500kbps");
  Serial.println("Waiting for IVT-S Current and Voltage data...");
  Serial.println("---------------------------------------------");
}

void loop() {
  if (CAN.available()) {
    CanMsg const msg = CAN.read();
    
    if (msg.id == IVT_CURRENT_ID && msg.data_length >= 6) {
      // Parse current value (bytes 2-5 as little-endian signed int32)
      current_ma = (int32_t)(
        msg.data[2] | 
        (msg.data[3] << 8) | 
        (msg.data[4] << 16) | 
        (msg.data[5] << 24)
      );
      lastUpdate = millis();
    }
    else if (msg.id == IVT_VOLTAGE_ID && msg.data_length >= 6) {
      // Parse voltage value (bytes 2-5 as little-endian signed int32)
      // Voltage is typically in millivolts (mV)
      voltage_mv = (int32_t)(
        msg.data[2] | 
        (msg.data[3] << 8) | 
        (msg.data[4] << 16) | 
        (msg.data[5] << 24)
      );
      lastUpdate = millis();
      
      // Display both current and voltage when voltage is updated
      displayReadings();
    }
  }
  
  // Display readings every second even if no new data
  if (millis() - lastUpdate >= 1000) {
    displayReadings();
    lastUpdate = millis();
  }
  
  delay(10);
}

void displayReadings() {
  // Convert to more readable units
  float current_a = current_ma / 1000.0;    // mA to A
  float voltage_v = voltage_mv / 1000.0;    // mV to V
  
  Serial.print("Current: ");
  Serial.print(current_a, 3);  // 3 decimal places
  Serial.print(" A (");
  Serial.print(current_ma);
  Serial.print(" mA) | Voltage: ");
  Serial.print(voltage_v, 1);  // 1 decimal place
  Serial.print(" V (");
  Serial.print(voltage_mv);
  Serial.println(" mV)");
}