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#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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#include <string.h>
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#include <util/delay.h>
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#include <stdlib.h>
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#include "config.h"
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#include "avrutil.h"
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#include "hc595.h"
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#include "twires.h"
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#ifndef NULL
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#define NULL    ((void *)0)
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#endif
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void writeSegment(uint8_t digit, uint8_t value);
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void pcInterrupt(void);
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void receiveEvent(uint8_t howMany);
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/* ------------------------------------------------------------------------- */
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#define I2C_SLAVE_ADDR  0x26
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#ifndef TWI_RX_BUFFER_SIZE
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#define TWI_RX_BUFFER_SIZE ( 16 )
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#endif
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volatile uint8_t tmr0_ovf = 0;
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volatile struct {
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        uint8_t current;
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        uint8_t last;
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        uint8_t mask;
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} pcInt;
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struct {
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	int8_t outer;
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	int8_t inner;
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} input;
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//volatile uint8_t doInt = 0;
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uint8_t disVal[] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
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uint8_t disPt[] = {0, 0};
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int main(void) {
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  /*
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  DDR : 1 = Output, 0 = Input
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  PORT: 1 = Pullup for Input, otherwise set output
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  PIN : Read input pin
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  */
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  /*
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		PA0	- Output					- System LED
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		PA1	- Input, Pullup				- System button
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		PA2 - N/A						- Reset
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  */
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  DDRA          = 0B00000001;
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  PORTA         = 0B00000010;
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  /*
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        PB0     - Input, PCInt, Pullup	- Rot1a
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        PB1     - Input, PCInt, Pullup	- Rot1b
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        PB2     - Input, PCInt, Pullup	- Rot2a
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        PB3     - Input, PCInt, Pullup	- Rot2b
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        PB4     - Input, Pullup			- Swap button
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        PB5     -
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        PB6     -
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        PB7     -
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  */
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  DDRB          = 0B00000000;
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  PORTB         = 0B00011111;
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  /*
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        PD0     -
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        PD1     -
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        PD2     -	Output			- Decimal Point
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        PD3     -	Output			- 4511 blanking
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        PD4     -	Output			- HC595 DS
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        PD5     - 	Output			- HC595 ST
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        PD6     -	Output			- HC595 SH
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  */
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  DDRD          = 0B01111100;
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  PORTD         = 0B00000000;
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    systime = 0;
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    sysclockInit();
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    PCMSK |= (( 1 << PCINT0 ) | ( 1 << PCINT1 )| ( 1 << PCINT2 )| ( 1 << PCINT3 ));
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    GIMSK |= (1 << PCIE);
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    //PCICR |= ( 1 << PCIE1 );
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    pcInt.last = PINB;
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    pcInt.current = pcInt.last;
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    pcInt.mask = 0;
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    twires_begin(I2C_SLAVE_ADDR);
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    twires_onReceive(receiveEvent);
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    wdt_enable(WDTO_1S);	// Watchdog for 1 sec
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    sei();					// Enable interrupts
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    hc595_init();
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    hc595_write(0x00);
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    uint32_t refresh = systime;
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    sbi(PORTA, PA0);
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    _delay_ms(100);
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    cbi(PORTA, PA0);
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    uint8_t disIdx = 0;
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    for(;;){
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    	 wdt_reset();
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    	/*
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		if ( rbi(PINA, PA1) )
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			cbi(PORTA, PA0);
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		else
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			sbi (PORTA, PA0);
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		*/
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		if (pcInt.current != pcInt.last) {
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			pcInterrupt();
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			//doInt = 0;
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		}
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		if (systime > refresh) {
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			writeSegment(disIdx, disVal[disIdx]);
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			refresh = systime+2;
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			disIdx++;
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			if (disIdx > 10) disIdx = 0;
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		}
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		twires_stop_check();
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    }
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    return 0;
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}
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void receiveEvent(uint8_t bytes) {
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	uint8_t cmd = twires_receive();
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	bytes--;
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	switch (cmd) {
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		case (0x05): {
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				while (bytes--) {
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					uint8_t data = twires_receive();
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					disVal[(data >> 4)] = (data & 0x0f);
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				}
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		}
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			break;
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		case (0x08): {
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				disPt[0] = twires_receive();
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				disPt[1] = twires_receive();
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		}
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			break;
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		case (0x0a): {
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					twires_send(input.outer);
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		}
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			break;
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		case (0x0b): {
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					twires_send(input.inner);
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		}
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			break;
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		case (0x0c): {
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					twires_send(!rbi(PINB, PB4));
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		}
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			break;
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		default: {
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			while (twires_available())
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				twires_receive();
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		}
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			break;
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	}
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}
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void writeSegment(uint8_t digit, uint8_t value) {
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	uint8_t dp = 0;
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	if (digit <= 4 && rbi(disPt[0], digit)) dp = 1;
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	if (digit > 4 && rbi(disPt[1], digit-5)) dp = 1;
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	cbi(PORTD, PD3);			// Blank the 4511
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	cbi(PORTD, PD2);			// Drop the DP before changing digit
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	hc595_write((value << 4) | (digit & 0x0f)); //Write the value and digit
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	if (dp) sbi(PORTD, PD2);	// Add DP if required
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	sbi(PORTD, PD3);			// Enable the 4511
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}
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void pcInterrupt() {
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		wdt_reset();
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		pcInt.mask = pcInt.current ^ pcInt.last;
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		pcInt.last = pcInt.current;
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        if (pcInt.mask == 0)
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        	return;
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        // Check which pin caused the interrupt. If they both
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        //  equal 0 || 1, the pin that interrupted is the direction
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        if (((rbi(pcInt.current, PCINT0) == 1 &&
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             rbi(pcInt.current, PCINT1) == 1) ||
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             (rbi(pcInt.current, PCINT0) == 0 &&
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              rbi(pcInt.current, PCINT1) == 0))) {
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              if (rbi(pcInt.mask, PCINT0) ) {
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        		input.outer += 1;
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              } else if (rbi(pcInt.mask, PCINT1) ) {
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            	input.outer -= 1;
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              }
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        }
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        if (((rbi(pcInt.current, PCINT2) == 1 &&
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                rbi(pcInt.current, PCINT3) == 1) ||
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                (rbi(pcInt.current, PCINT2) == 0 &&
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                 rbi(pcInt.current, PCINT3) == 0))) {
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        	if (rbi(pcInt.mask, PCINT2) ) {
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        		input.inner += 1;
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        	} else if (rbi(pcInt.mask, PCINT3) ) {
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        		input.inner -= 1;
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        	}
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        }
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        // Clear the mask so we know we've dealt with it
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        pcInt.mask = 0;
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}
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#ifdef _AVR_ATtiny4313_H_
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ISR(PCINT_B_vect) {
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#else
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ISR(PCINT_vect) {
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#endif
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	pcInt.current = PINB;
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	//doInt = 1;
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}
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ISR(TIMER0_OVF_vect) {
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    tmr0_ovf++;
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	// Clk/1 TCCR0B = (1<< CS00);
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	//20.0Mhz, 1ms = 78ovf
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	//16.5Mhz, 1ms = 64ovf
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	//16.0Mhz, 1ms = 62ovf
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	//12.0Mhz, 1ms = 46ovf
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	// 8.0Mhz, 1ms = 31ovf
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    // 8.0Mhz, .5ms = 15ovf, 160r
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	if (tmr0_ovf>=15) {
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			systime++;
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			tmr0_ovf = 0;
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	}
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}