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/*
 * NCIR Temperature Sensor MLX90614
 * April 17, 2020
 * By Yousef Shabat
 */
#include <M5StickC.h>
#include <Wire.h>

// Screen Orientation
#define TOP_LEFT    1
#define TOP_RIGHT   3

// Global Variables
int rotation = TOP_LEFT;        // Screen Orientation
boolean lock_rotation = false;  // Rotation Lock
boolean lock_screen = false;    // Screen Lock

// Rotate Screen
void rotated() {
  M5.Lcd.fillScreen(BLACK);
  M5.Lcd.setRotation(rotation);
}

// Temperature Measurement
float measurement() {
  uint16_t result;

  Wire.beginTransmission(0x5A); // Send Initial Signal and I2C Bus Address
  Wire.write(0x07);             // Send data only once and add one address automatically.
  Wire.endTransmission(false);  // Stop signal
  Wire.requestFrom(0x5A, 2);    // Get 2 consecutive data from 0x5A, and the data is stored only.
  result = Wire.read();         // Receive DATA
  result |= Wire.read() << 8;   // Receive DATA
 
  return result * 0.02 - 273.15;
}

void setup() {
  // Initialize M5StickC
  M5.begin();
  M5.MPU6886.Init();              // Initialize 6-Axis IMU
  M5.Lcd.setRotation(rotation);   // Initialize Screen
  M5.Lcd.setTextColor(WHITE, BLACK);

  // Initialize I2C PIN for NCIR MLX90614 hat
  Wire.begin(0, 26);
}

void loop() {
  M5.update();

  // Toggle Screen Lock
  if (M5.BtnA.wasPressed()) {
    if (lock_screen) {
      lock_screen = false;
    } else {
      lock_screen = true;
    }
  }

  // Toggle Rotation Lock
  if (M5.BtnB.wasPressed()) {
    if (lock_rotation) {
      lock_rotation = false;
    } else {
      lock_rotation = true;
    }
  }

  if (lock_screen) {
    M5.Lcd.drawString("Screen Lock", 4, 2, 1);
  } else {
    M5.Lcd.drawString("           ", 4, 2, 1);

    if (lock_rotation) {
      M5.Lcd.drawString("Rotation Lock", 4, 70, 1);
    } else {
      M5.Lcd.drawString("             ", 4, 70, 1);
 
      // Change screen orientation with 6-axis IMU
      float accX = 0; float accY = 0; float accZ = 0;
      M5.MPU6886.getAccelData(&accX, &accY, &accZ);
      //Serial.println(accX);
      if (accX < 0 && rotation == TOP_LEFT) {
        rotation = TOP_RIGHT;
        rotated();
      }
      if (accX > 0 && rotation == TOP_RIGHT) {
        rotation = TOP_LEFT;
        rotated();
      }
    }

    // Temperature measurement and display
    float temp = measurement();
    String strTemp = String(temp, 1);
    if (-10 < temp && temp < 10) {
      strTemp = "   " + strTemp;
    }
    if (10 < temp && temp < 100) {
       strTemp = " " + strTemp;
    }
    M5.Lcd.drawRightString(strTemp, 150, 16, 7);
    //Serial.println(strTemp);
  }

  delay(100);
}

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