// vim:set et sw=2 ts=2 tw=120:
#include <stdint.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

#include "inc/int/dcf77.h"

#define CTC_MATCH_OVERFLOW ((F_CPU / 1000) / 8)

// set bit
static inline void BIT_SET(volatile uint8_t* target, uint8_t bit) __attribute__((always_inline));
static inline void BIT_SET(volatile uint8_t* target, uint8_t bit) { *target |= (1 << bit); };

// set clear
static inline void BIT_CLEAR(volatile uint8_t* target, uint8_t bit) __attribute__((always_inline));
static inline void BIT_CLEAR(volatile uint8_t* target, uint8_t bit) { *target &= ~(1 << bit); };


/*
 * 
 * PB2        : connected to ShiftClock on Port 11
 * PB3        : connected to MemoryClock on Port 12 (shows content of memory)
 * PB4 (PIN3) : connected to SERIAL_IN on pin 14
 *
 */

void pulse_sck()
{
  PORTB |= (1 << PB2);
  PORTB ^= (1 << PB2);

}

void print_data(uint16_t data)
{
  //BIT_CLEAR(&PORTB, PB4);
  //BIT_SET(&PORTB, PB4);

  for (uint16_t i = 0; i < 16; i++)
  {
    data & 0x1 << i
      ? BIT_SET(&PORTB, PB4)
      : BIT_CLEAR(&PORTB, PB4);
    pulse_sck();
  }
  //BIT_CLEAR(&PORTB, PB4);
  // pulse_sck();
  BIT_CLEAR(&PORTB, PB3);
  BIT_SET(&PORTB, PB3);

}

int main(void)
{

  BIT_CLEAR(&PORTB, PB5);
  _delay_ms(20);
  BIT_SET(&PORTB, PB5);
  BIT_CLEAR(&PORTB, PB5);
  _delay_ms(20);
  BIT_SET(&PORTB, PB5);



  // make all pins output pins...
  DDRB  = 0xFF;
  DDRB &= ~(1 << PB0); // makes PB0 an input pin (INT0)
  PORTB |= (1 << PB0); // activate input resistor

  // activate dcf77-receiver...
  PORTB &=  (1 << PB1); // sets PB1 to low
  _delay_ms(20);
  PORTB &= ~(1 << PB1); // sets PB1 to low


  cli();

  /*
  GIMSK |= (1<<INT0); // External Interrupt Request 0 Enable
  GIMSK |= (1<<PCIE); // Pin Change Interrupt Enable

  // MCU Control Register (controls CPU-behaviours like interrupts & sleepmode)
  MCUCR |= ~(1<<ISC01) | (1<<ISC00); // any logical change generates interrupt
  PCMSK |= (1<<PCINT0);
  // INT0_CONTROL = INT0_RISING_EDGE; // going to toggle int0-behaviour
  */

  TCCR0A |= (1 << WGM01);              // CTC mode
  // TCCR0B |= (1 << CS00);
  TCCR0B |= (1 << CS01);               // Prescaler 8
  // TCCR0B |= (1 << CS02);               // Prescaler 256
  // OCR0A  |= (1 << WGM01);              // CTC mode

  // OCR0A   = 149;
  OCR0A   = 124;
  // OCR0A   = CTC_MATCH_OVERFLOW;
  TIMSK  |= (1 << OCIE0A);             // if you want interrupt

  sei();

  while (1)
  {
    // uint16_t t = 1;
    // for (uint16_t i=0; i<16; i++)
    // {
      print_data(t_current.s);
      // t = t<<1;
    // }
    // print_data(t_current.s);


    /*
      print_data(0xFFFF);
      _delay_ms(1000);
      print_data(0x0000);
      _delay_ms(1000);
    */
  }
  return 0;
}


/*
for(uint16_t hour=0; hour<24; hour++)
  for(uint16_t minute=0; minute<60; minute++)
    for (uint16_t second = 1; second < 60; second++)
    {
      // clear register (reset)
      // print_data(hour<< 12 | minute << 6 | second);
      // print_data((int64_t) dcf77);
      // dcf77[dcf77_bit].bit == 1
      //   ? print_data(0xFFFF)
      //   : print_data(0x0000);
    }A
*/