// Version 8, 09.04.2023

#include <LiquidCrystal_I2C.h>
#include<SPI.h>
#include <stdio.h>


#define MOSI 11
#define MISO  12
#define SPICLOCK  13

#define CS 4 //CS

byte clr;
byte clr1;



LiquidCrystal_I2C lcd(0x27, 20, 4);    //Zuweisen Adresse (0x27); 20 (Stellen); 4 (Zeilen)

byte counterStart = 131;  // alternative: 6
unsigned int scaleFactor = 250; // alternative: 1000


//char spi_transfer(volatile char data)
unsigned char  spi_transfer(char  data)
{
  
  SPDR = data;                    // Start the transmission
  while (!(SPSR & (1<<SPIF)))     // Wait the end of the transmission
  {
  };
  clr = SPSR;
  clr = SPIF;
  return SPDR;                    // return the received byte
  
}


void CS5524_init()
{
  lcd.setCursor(0, 2);                // setze Kursor in zweite Zeile
  //lcd.print("                    ");      // dritte Zeile
    lcd.print("             posinit");      // dritte Zeile
  delay(1000);
  
  byte data = 0b11111111;
  PORTD &= ~(1 << PD4); //CS5524 Chip-select auf low
  for(int i = 1; i <= 15; i++)
  {
    spi_transfer(data);
  }
  data = 0b11111110;
  spi_transfer(0xFE);

  data = 0b00000011;
  spi_transfer(0x03); 
  data = 0b00100000;
  spi_transfer(0x20);  

  data = 0b00000000;
  for(int i = 1; i <= 3; i++)
  {
    spi_transfer(data);
  }
  delay(10);
    
  data = 0b00000011;
  spi_transfer(data); 
  data = 0b00000000;
  for(int i = 1; i <= 4; i++)
  {
    spi_transfer(data);
  }
  PORTD |= (1 << PD4);  //CS5524 Chip-select auf high
  delay(500);
    lcd.setCursor(0, 2);                // setze Kursor in zweite Zeile
  //lcd.print("                    ");      // dritte Zeile
    lcd.print("          posinitaus");      // dritte Zeile
  delay(2000);
}

unsigned char  ADC_Werte0 = 'a';  //MSB
unsigned char  ADC_Werte1 = 'a';
unsigned char  ADC_Werte2 = 'a';  //LSB
unsigned char  ADC_Werte3 = 'a';  //Infos

void CS5524_read(char Kannal) //(char Kannal)
{
  //lcd.setCursor(0, 3); 
  //lcd.print(" Autobus2           ");
  delay(10);
  
  //char ADC_Werte[4];
  PORTD &= ~(1 << PD4); //CS5524 Chip-select auf low

  byte data = 0b10000000; //select Kannal 1, Temperatur
  spi_transfer(data);
  delay(500);
  
  data = 0b00000000; //SDO flag loeschen
  //spi_transfer(data);

  //ADC-Werte einlesen

  ADC_Werte0 = spi_transfer(data);  //MSB
  ADC_Werte1 = spi_transfer(data);
  ADC_Werte2 = spi_transfer(data);  //LSB
  ADC_Werte3 = spi_transfer(data);  //Infos

  PORTD |= (1 << PD4);  //CS5524 Chip-select auf high
  
  //lcd.setCursor(0, 3);   
  //lcd.print(" Autobus3           ");
  delay(10);
  
  lcd.setCursor(0, 0);             
  lcd.print(ADC_Werte0); 
  lcd.setCursor(0, 1);             
  lcd.print(ADC_Werte1); 
  lcd.setCursor(0, 2);             
  lcd.print(ADC_Werte2);   
  lcd.setCursor(0, 3);             
  lcd.print(ADC_Werte3);   
}

void setup()
{ 

  // Watchdog Anfang
  TCCR2A = 0x00; // OC2A and OC2B disconnected; Wave Form Generation Mode 0: Normal Mode
  TCCR2B = (1<<CS22) + (1<<CS21); // prescaler = 256
  // TCCR2B = (1<<CS22); // prescaler = 64; 
  TIMSK2 = (1<<TOIE2); // interrupt when TCNT2 is overflowed
  TCNT2 = counterStart;
  DDRD |= (1<<PD7);
  // Watchdog Ende

  Serial.begin(9600);


  DDRD |= (1 << PD4); // CS5524 Chip-select
  DDRB |= (1 << PB3) | (1 << PB5); // MOSI, MISO, SCK
  delay(10);
  
  PORTD |= (1 << PD4);  //CS5524 Chip-select auf high
  
  // SPCR = 01010000
  //interrupt disabled,spi enabled,msb 1st,controller,clk low when idle,
  //sample on leading edge of clk,system clock/8 rate (fastest)
  delay(100);

 
  SPI.begin();

   //SPCR |= (1 << SPE)|(1 << MSTR)|(1 << SPR1) | (1 << SPR0);
  //bitSet(SPCR, 4);  // MSTR Bit
  //bitSet(SPCR, 7);
  SPI.setBitOrder(MSBFIRST);  //bit transmission order
  SPI.setDataMode(SPI_MODE2); // Mode2
  SPI.setClockDivider(SPI_CLOCK_DIV16);  
  bitClear(SPCR, 7);   //local SPI interrupt is disable
  //bitSet(SPCR, 7);

  //clr = SPSR;
  //clr = SPDR;

/*
  SPCR |= (1 << MSTR);
  SPCR |= (1 << CPOL) | (1 << CPHA);
  SPCR &= ~(1 << DORD);
  SPSR &= ~(1 << SPI2X);
  SPCR |= (1 << SPR0) | (1 << SPR1);
  SPCR |= (1 << SPE);
*/  

  
  //sei();

  
  delay(100);
  //CS5524_init();

  //clr = SPSR;
  //clr1 = SPDR;
  
  
  /*
  PORTD |= (1 << PD4);  //CS5524 Chip-select auf high
  PORTD &= ~(1 << PD4); //CS5524 Chip-select auf low
  */

  delay(100);

  lcd.init();                         // LCD initialisierung
  lcd.backlight();                    // Einschalten Backlight

  lcd.setCursor(0, 0);                // Hochfahrbildschrim 1
  lcd.print("         V1         ");        // erste Zeile
  lcd.setCursor(0, 0);                // Hochfahrbildschrim 1
  lcd.print(clr1);        // erste Zeile
  
  lcd.setCursor(0, 1);                // setze Kursor in zweite Zeile
  lcd.print("                    ");      // zweite Zeile
  lcd.setCursor(0, 2);                // setze Kursor in zweite Zeile
  lcd.print("                    ");      // dritte Zeile
  lcd.setCursor(0, 3);                // Hochfahrbildschrim 1
  lcd.print("                    ");

  delay(1000);

  lcd.setCursor(0, 0);                // Hochfahrbildschrim 1
  lcd.print("     Pos1           ");        // erste Zeile

  delay(100);
  CS5524_init();
  delay(500);

  lcd.setCursor(0, 0);                // Hochfahrbildschrim 1
  lcd.print("     Pos2           ");        // erste Zeile

  Read_config_register();

  lcd.setCursor(0, 0);                // Hochfahrbildschrim 1
  lcd.print("     Pos3           ");        // erste Zeile
}

void Read_config_register()
{
  unsigned char config_register_werte = '1';

  lcd.setCursor(0, 0);                // Hochfahrbildschrim 1
  lcd.print("           Pos8      ");      // dritte Zeile
  lcd.setCursor(9, 0);                // Hochfahrbildschrim 1
  lcd.print(config_register_werte);        // erste Zeile
  delay(1000); 

  PORTD &= ~(1 << PD4); //CS5524 Chip-select auf low
  char data = 0b00001011; // byte zum Lesen von config_register
  spi_transfer(data);
  data = 0b00000000; //SDO flag loeschen
  spi_transfer(data);
  delay(1);
  ADC_Werte0 = spi_transfer(data);  //MSB
  ADC_Werte1 = spi_transfer(data);
  ADC_Werte2 = spi_transfer(data);  //LSB
  //ADC_Werte3 = spi_transfer(data);  //Infos

  PORTD |= (1 << PD4);  //CS5524 Chip-select auf high
  
  //lcd.setCursor(0, 3);   
  //lcd.print(" Autobus3           ");
  delay(10);
  
  lcd.setCursor(5, 0);             
  lcd.print(ADC_Werte0); 
  lcd.setCursor(5, 1);             
  lcd.print(ADC_Werte1); 
  lcd.setCursor(5, 2);             
  lcd.print(ADC_Werte2);   
  lcd.setCursor(0, 3);             
  lcd.print("                    ");      // dritte Zeile

  delay(5000);  

  channel_setup();
  delay(500);
}

void channel_setup()
{
  PORTD &= ~(1 << PD4); //CS5524 Chip-select auf low

  //Setting the channel setup register

  char data;
  
  data = 0b00000101;   
  spi_transfer(data);
  
  data = 0b00000100;    
  spi_transfer(data);
  
  data = 0b11000000;
  spi_transfer(data);
  
  data = 0b01000100;
  spi_transfer(data);
  
  data = 0b11000000;
  spi_transfer(data);  
  
  PORTD |= (1 << PD4);  //CS5524 Chip-select auf high
}

ISR(TIMER2_OVF_vect)
{
  static int counter = 0;
  TCNT2 = counterStart;
  counter++;
  if(counter == 250) // scaleFactor = 250
  {
    PORTD ^= (1<<PD7);
    counter = 0; 
  }

}


void loop()
{ 
  //lcd.print(" Autobusdd          ");
  delay(200);
  CS5524_read(1);
  delay(200);
  //lcd.setCursor(0, 3);               
  //lcd.print(" Autobus9aa         ");
}