/*******************************************************
Projekt:        Aetzwanne

Version :        ATTiny2313A - 1
Erstellt:        22.09.2016
Letze Aenderung: 25.09.2016

Chip: Attiny2313A mit internen 8.0 MHz
*******************************************************/

/// Header-Dateien ///
#include <io.h>
#include <delay.h>

/// Definierungen ///
#define InterruptIn PIND.2
#define DataIn      PIND.3

#define SegmentA    PORTB.7
#define SegmentB    PORTB.6
#define SegmentC    PORTB.5
#define SegmentD    PORTB.4
#define SegmentE    PORTB.3
#define SegmentF    PORTB.2
#define SegmentG    PORTB.1

#define Digit1      PORTB.0
#define Digit2      PORTD.6

/// Prototypen ///
void write_bitmuster (char temp_part);
 
/// Globale Variablen ///
char interruptzaehler = 0;

char temp_einer_bit0;
char temp_einer_bit1;
char temp_einer_bit2;
char temp_einer_bit3;

char temp_zehner_bit0;
char temp_zehner_bit1;
char temp_zehner_bit2;
char temp_zehner_bit3;

// External Interrupt 0 service routine
interrupt [EXT_INT0] void ext_int0_isr(void)
{
    switch (interruptzaehler)
    {
        case 0: 
            temp_einer_bit0 = DataIn;
            break;
        
        case 1: 
            temp_einer_bit1 = DataIn;
            break;
            
        case 2: 
            temp_einer_bit2 = DataIn;
            break;
        
        case 3: 
            temp_einer_bit3 = DataIn;
            break; 
            
        case 4: 
            temp_zehner_bit0 = DataIn;
            break; 
            
        case 5: 
            temp_zehner_bit1 = DataIn;
            break; 
            
        case 6: 
            temp_zehner_bit2 = DataIn;
            break; 
        
        case 7: 
            temp_zehner_bit3 = DataIn;
            break;   
    }
            
    interruptzaehler++;
        
    if (interruptzaehler == 8)
        interruptzaehler = 0;  
}

void main(void)
{
    //Lokale Varibalen
    char temp_part = 0;  
    
    // Crystal Oscillator division factor: 1
    #pragma optsize-
    CLKPR=(1<<CLKPCE);
    CLKPR=(0<<CLKPCE) | (0<<CLKPS3) | (0<<CLKPS2) | (0<<CLKPS1) | (0<<CLKPS0);
    #ifdef _OPTIMIZE_SIZE_
    #pragma optsize+
    #endif

    /// Port Initialisierung ///
    // Port A: Bit2=Out Bit1=Out Bit0=Out 
    DDRA=(1<<DDA2) | (1<<DDA1) | (1<<DDA0);
    PORTA=(0<<PORTA2) | (0<<PORTA1) | (0<<PORTA0);

    // Port B: Bit7=Out Bit6=Out Bit5=Out Bit4=Out Bit3=Out Bit2=Out Bit1=Out Bit0=Out 
    DDRB=(1<<DDB7) | (1<<DDB6) | (1<<DDB5) | (1<<DDB4) | (1<<DDB3) | (1<<DDB2) | (1<<DDB1) | (1<<DDB0);
    PORTB=(0<<PORTB7) | (0<<PORTB6) | (0<<PORTB5) | (0<<PORTB4) | (0<<PORTB3) | (0<<PORTB2) | (0<<PORTB1) | (0<<PORTB0);

    // Port D: Bit6=Out Bit5=Out Bit4=Out Bit3=In Bit2=In Bit1=Out Bit0=Out 
    DDRD=(1<<DDD6) | (1<<DDD5) | (1<<DDD4) | (0<<DDD3) | (0<<DDD2) | (1<<DDD1) | (1<<DDD0);
    PORTD=(0<<PORTD6) | (0<<PORTD5) | (0<<PORTD4) | (0<<PORTD3) | (0<<PORTD2) | (0<<PORTD1) | (0<<PORTD0); 
    
    // Externe Interrupts Initialisierung: INT0: ein
    MCUCR=(0<<ISC11) | (0<<ISC10) | (1<<ISC01) | (1<<ISC00);
    GIMSK=(0<<INT1) | (1<<INT0) | (0<<PCIE0) | (0<<PCIE2) | (0<<PCIE1);
    GIFR=(0<<INTF1) | (1<<INTF0) | (0<<PCIF0) | (0<<PCIF2) | (0<<PCIF1);

    #asm("sei")
    
    while (1)
    {            
        //Einerstelle ausrechnen und Multiplexen 
        temp_part = temp_einer_bit0 + temp_einer_bit1 * 2 + temp_einer_bit2 * 4 + temp_einer_bit3 * 8;
        write_bitmuster (temp_part); 
        Digit2 = 1;
        delay_ms (1); 
        Digit2 = 0;
        
        temp_part = temp_zehner_bit0 + temp_zehner_bit1 * 2 + temp_zehner_bit2 * 4 + temp_zehner_bit3 * 8;
        write_bitmuster (temp_part);  
        Digit1 = 1;
        delay_ms (1); 
        Digit1 = 0;
    }
}

void write_bitmuster (char temp_part)
{
    switch (temp_part)
    { 
        case 0:     
            SegmentA = 1;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 1;
            SegmentE = 1;
            SegmentF = 1;
            SegmentG = 0;   
            break;   
                
        case 1:     
            SegmentA = 0;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 0;
            SegmentE = 0;
            SegmentF = 0;
            SegmentG = 0; 
            break;
                
        case 2:     
            SegmentA = 1;
            SegmentB = 1;
            SegmentC = 0;
            SegmentD = 1;
            SegmentE = 1;
            SegmentF = 0;
            SegmentG = 1; 
            break;
                
        case 3:     
            SegmentA = 1;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 1;
            SegmentE = 0;
            SegmentF = 0;
            SegmentG = 1;
            break;
                
        case 4:     
            SegmentA = 0;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 0;
            SegmentE = 0;
            SegmentF = 1;
            SegmentG = 1;
            break;
                
        case 5:     
            SegmentA = 1;
            SegmentB = 0;
            SegmentC = 1;
            SegmentD = 1;
            SegmentE = 0;
            SegmentF = 1;
            SegmentG = 1;
            break;
                
        case 6:     
            SegmentA = 1;
            SegmentB = 0;
            SegmentC = 1;
            SegmentD = 1;
            SegmentE = 1;
            SegmentF = 1;
            SegmentG = 1;
            break;
                
        case 7:     
            SegmentA = 1;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 0;
            SegmentE = 0;
            SegmentF = 0;
            SegmentG = 0; 
            break;
                
        case 8:     
            SegmentA = 1;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 1;
            SegmentE = 1;
            SegmentF = 1;
            SegmentG = 1;   
            break;
                
        case 9:     
            SegmentA = 1;
            SegmentB = 1;
            SegmentC = 1;
            SegmentD = 1;
            SegmentE = 0;
            SegmentF = 1;
            SegmentG = 1;   
            break;
    }
}