// předefinování a přečíslování i2c sběrnic - Wire() , Wire1()
// upraveno přepínání Wire() a Wire1() ternárním operátorem
// tcaselect funguje o.k. 
// ještě propracovat PCA_routines ...
// zapracovat NEX :A different approach ... example pro spolecne cteni/posilani 8bit Go, Halt, dir... 

//#define DEBUG       // Pokud zakomentuju nebo smažu, blok se nepřeloží
#define PWM         // obsluha pwm_PCA.h    
#define NEX         // obsluha next.h
#define PCF         // obsluha next.h

uint16_t pcf_inputs;

#include "defs.h"             //  deklarace společných proměnných

#include <WiFi.h>
#include <Wire.h>

#include <LiquidCrystal_I2C.h>
//LiquidCrystal_I2C lcd(LCD1_ADDRESS, 16, 2);     // je v I2C.h

#include "I2C.h"
#include "NTP.h"

//uint8_t error;
unsigned long duration, period, start, finished, elapsed;     // pomocne pro time

#include "PCA_routines.h"
#include "PCF_routines.h"
#include "NEX_routines.h"

void setup() {

  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.println("H0 Railway ESP32");
  lcd.setCursor(0, 1);
  lcd.println("structs    v: 08");

  Serial.begin(115200);                               //  hwUART0 default pins RX=GPIO3 TX=GPIO1, can be remapped
//Serial1.begin(9600);                                //  hwUART1 e.g. pins RX=GPI09 TX=GPI10, flash memory conflict..
#ifdef NEX
  Serial2.begin(9600, SERIAL_8N1, 16, 17);            //  hwUART2 e.g. pins RX=GPI16 TX=GPI17 for Nextion serial
#endif NEX

// best safe use hwUART2: pins RX=GPI16/TX=GPI17 independent off usb programming,boot/loop,internal memory, wifi etc

  Wire.begin();                                       // běží s default parametry
  Wire.setClock(Wire_FREQ);
//  Wire.begin(SDA, SCL, Wire_FREQ);                  // možnost změny default parametrů
// !!! Wire1.begin();                                    // nefunguje bez zadání pinů
  Wire1.begin(SDA_1, SCL_1, Wire_1_FREQ);             //  druhá sběrnice, deklarace parametrů v I2C.h                                    //

  Serial.println("Hello, H0 by ESP32!");
  vTaskDelay(pdMS_TO_TICKS(500));



  I2C_scan(0);            // scan systemové sběrice Wire()
  I2C_scan(1);            // scan sběrnice Wire1()
  
  lcd.setCursor(0, 0);
  lcd.print("Connecting to ");
  lcd.setCursor(0, 1);
  lcd.print("WiFi .........  ");
  vTaskDelay(pdMS_TO_TICKS(500));

  WiFi.begin("Wokwi-GUEST", "", 6);

  uint64_t startTime = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - startTime < timeout) {
    delay(250);
    spinner();
  }
    if (WiFi.status() == WL_CONNECTED) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("WiFi connected");
    lcd.setCursor(0, 1);
    lcd.print("local IP : ");
    lcd.setCursor(0, 1);
    lcd.print(WiFi.localIP());
    Serial.println("\nConnected to WiFi!");
    Serial.println(WiFi.localIP());
  } else {
    lcd.setCursor(0, 1);
    lcd.print("ConnectionFailed");
    Serial.println("\nConnection Timeout or Failed. Continuing offline...");
  }
  vTaskDelay(pdMS_TO_TICKS(500));
 
 // lcd.clear();
 // lcd.setCursor(0, 0);
 // lcd.println("Online");
  configNTP();          /********************************************************************************************/
    lcd.setCursor(0, 1);
    lcd.println("..local time set");
  vTaskDelay(pdMS_TO_TICKS(500));

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.println("Online     H0_08");

#ifdef PWM
  PCA_setup();           /********************************************************************************************/
#endif

  vTaskDelay(pdMS_TO_TICKS(500));

}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////   main loop   //////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void loop() {

  delay(10); // this speeds up the simulation

// aktualizace času na LCD každoých 500 msec
  if (millis()-period >= 500)
  {
  printLocalTime();     /********************************************************************************************/
  period=millis();
  }

// PCF readings
  i2c_bus = 0;          // select system i2c bus (wire())
  pcf_inputs = ~pcf8575_read(i2c_bus,0x21);                     // testování read
  Serial.println("PCF8575_21 wire : ");
  Serial.println(pcf_inputs,BIN);

  i2c_bus = 1;          // select (wire1) i2c bus
  tcaselect(1);         // přepínání kanálů funguje, TCA na sběrnici 1 (Wire1())

  pcf_inputs = ~pcf8575_read(i2c_bus, 0x24);
  pcf8575_write(0, 0x22, pcf_inputs);                           // testování write
  Serial.println("PCF8575_24 wire2 : ");
  Serial.println(pcf_inputs,BIN);
  pcf_inputs = ~pcf8575_read(i2c_bus, 0x25);
  pcf8575_write(0, 0x23, pcf_inputs);                           // testování write


#ifdef NEX
  nex_read_data();      /********************************************************************************************/
  if (dataReady) {
    nex_parse_data();   /********************************************************************************************/
    dataReady = false;
  }
#endif NEX

#ifdef PWM
//  Serial.println(millis());
  write_pwm();            //   trvá cca 
//  Serial.println(millis());
#endif

vTaskDelay(pdMS_TO_TICKS(1000));

}

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  lcd.setCursor(15, 1);
  lcd.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}