// Learn about the ESP32 WiFi simulation in
// https://docs.wokwi.com/guides/esp32-wifi

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Pin Layout
#define SR_DAT 16
#define SR_OEN 2
#define SR_CLK 17
#define SR_LTC 15
#define SR_RST 4
#define BZ_OUT 13

// I2C Devices
#define I2C_LCD 0x27  // Liquid Crystal Display
#define I2C_RTC 0x00  // Real Time Clock
#define I2C_IMU 0x01  // Spedometer

// LCD
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(I2C_LCD, 16, 2);

// This method sends bits to the shift register:
void registerWrite(int whichPin, int whichState) {
  // the bits you want to send
  byte bitsToSend = 0;
  // turn off the output so the pins don't light up
  // while you're shifting bits:
  digitalWrite(SR_LTC, HIGH);
  // turn on the next highest bit in bitsToSend:
  bitWrite(bitsToSend, whichPin, whichState);
  // shift the bits out:
  shiftOut(SR_DAT, SR_CLK, MSBFIRST, bitsToSend);
  // turn on the output so the LEDs can light up:
  digitalWrite(SR_LTC, LOW);
}

void setup() {
  Serial.begin(115200);

  // Setup SR
  pinMode(SR_DAT, OUTPUT);
  pinMode(SR_OEN, OUTPUT);
  pinMode(SR_CLK, OUTPUT);
  pinMode(SR_LTC, OUTPUT);
  pinMode(SR_RST, OUTPUT);
  pinMode(BZ_OUT, OUTPUT);

  // Default States
  digitalWrite(SR_OEN, LOW);
  digitalWrite(SR_RST, HIGH);

  LCD.init();
  LCD.backlight();

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.println("GoTrax XR Elite");
  LCD.setCursor(0, 1);
  LCD.println("Please Update FW");
}

void loop() {
  tone(BZ_OUT, 800, 1000);
  for(int idx=0; idx<16; idx++) {
    registerWrite(idx, 255);
    delay(250);
    registerWrite(idx, 0);
    delay(250);
  }
  delay(250);
}