#include "defs.h"
#include "funcs.c"
#include <math.h>
uint8_t tempHolder;

void SPI_Modes_Setting(int mode)
{
  if (mode == 0)
  {
    // CPOL and CPHA
    SPCR &= ~(1 << CPOL) & ~(1 << CPHA);
  } else if (mode == 1)
  {
    SPCR &= ~(1 << CPOL);
    SPCR |= (1 << CPHA);
  } else if (mode == 2)
  {
    SPCR |= (1 << CPOL);
    SPCR &= ~(1 << CPHA);
  } else if (mode == 3)
  {
    SPCR |= (1 << CPOL) | (1 << CPHA);
  }
}

void SPI_MasterInit(void)
{
  SREG |= (1 << 7);
  // SPI mode configuration for CPOL and CPHA
  SPI_Modes_Setting(0);
  //fosc/128 selected
  //SPCR |= (1 << SPR0) | (1 << SPR1);
  //SPSR &= ~(1 << SPI2X);
  // DDB5 --> SCK , DDB3 --> MOSI , DDB2 --> SS , DDB1 --> Output Enable ,
  DDRB |= (1 << DDB5) | (1 << DDB3) | (1 << DDB2) | (1 << DDB1) ;
  // DDB4 --> MISO
  DDRB &= ~(1 << DDB4);
  PORTB |= (1 << DDB1);
  //portD settings
  // DDD2 --> pbBlk , DDD3 --> pbBlu , DDD4 --> pbRed , DDD5 --> pbGrn
  DDRD &= ~(1 << DDD2) | (1 << DDD3) | (1 << DDD4) | (1 << DDD5);
  // Arduino as SPI Master
  SPCR |= (1 << DORD) | (1 << MSTR);
  //SPI Enable
  SPCR |= (1 << SPE); // enable right after Data registers are ready
  // SPI Interrupt Enable
  SPCR |= (1 << SPIE);
}
uint8_t dummyRead, i = 0;

// spi communication global control variable
struct spiVarStruct spiVar;

// spi interrupt function
ISR(SPI_STC_vect) {
  //read data register
  dummyRead = SPDR;
  if (!(spiVar.len > spiVar.ind + 1)) {
    spiVar.ind = 0;
    spiVar.inProc = false;
  } else {
    spiVar.ind++;
    SPDR = (uint8_t) * (spiVar.sendBuff + spiVar.ind);
  }
}

// spi Master send data with interrupt
bool spi_SendDataInt(struct spiVarStruct* spiVar)
{
  if (spiVar->inProc) {
    return false;
  } else {
    spiVar->inProc = true;
    SPDR = (uint8_t) * (spiVar->sendBuff);
    return true;
  }
}


void updtLEDMatrices() {
  for (uint8_t y = 0; y < 8; y++) {
    PORTB &= ~(1 << DDB2); //ss low
    for (uint8_t x = 0; x < 8; x++) {
      tempHolder = y + 1;
      spiVar.sendBuff = &tempHolder;
      spiVar.len = 1;
      spiVar.ind = 0;
      spi_SendDataInt(&spiVar);
      delay(0.1);
      while (spiVar.inProc);
      spiVar.sendBuff = leds[x] + y;
      spi_SendDataInt(&spiVar);
      delay(0.1);
      while (spiVar.inProc);
    }
    PORTB |= (1 << DDB2); //ss high
  }
}
void clrLEDMatrices() {
  clearData(leds);
  updtLEDMatrices();
}
void setup() {
  Serial.begin(9600);
  SPI_MasterInit();
  PORTB |= (1 << DDB2);
  clearData(leds);
  pinMode(5, INPUT);
}

void buildDigits(int val, int noOfdigs, int strtDig) {
  int ans;
  int rem;
  for (int x = 0; x < noOfdigs; x++)
  {
    if (x == 0)
    {
      ans = val / pow(10, (noOfdigs - (x + 1)));
      rem = val % (int)pow(10, (noOfdigs - (x + 1)));
    } else {
      ans = rem / pow(10, (noOfdigs - (x + 1)));
      rem = rem % (int)pow(10, (noOfdigs - (x + 1)));
    }
    if (ans == 0 && strtDig == 0 && x == 0)
    {
      makeNumber(leds, 6 * (x + strtDig), 12);
    } else
    {
      makeNumber(leds, 6 * (x + strtDig), ans);
    }
  }
}
void wrtFloatToLed(float val) {
  clrLEDMatrices();
  buildDigits((int)val, 4, 0);
  makeNumber(leds, 6 * 4, 11);
  buildDigits((int)(10000 * (val - (int)val)), 4, 5);
  updtLEDMatrices();
}

float test01 = 0;
void loop()
{
  if (digitalRead(4)) {
    if (test01 > 0)
    {
      test01 -= 1.125;
    }
  }
  if (digitalRead(5)) {
    if (test01 < 9999)
    {
      test01 += 1.125;
    }
  }
  wrtFloatToLed(test01);
  delay(100);
}