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#include <tiny13a.h>
#include <delay.h>

// Declare your global variables here

inline void wr_reg(char cData)
{
    char temp = cData;
    char i=0;
    for(i=0; i<8; i++)
    {
        PORTB.0 = (temp & 0x80);
        #asm("nop");
        PORTB.2 = 1;
        #asm("nop");        
        PORTB.2 = 0;
        temp = temp << 1;
    }
}

inline void latch_reg()
{
    #asm("nop");
    PORTB.1 = 1;
    #asm("nop");         
    PORTB.1 = 0;
}

flash char cSeg[]={
0b00111111, // 0
0b00000110, // 1
0b01011011, // 2
0b01001111, // 3
0b01100110, // 4
0b01101101, // 5
0b01111101, // 6
0b00000111, // 7
0b01111111, // 8
0b01101111  // 9
};

char cDec = 0;
volatile char cDigit[8];
interrupt [TIM0_COMPA] void timer0_compa_isr(void)
{
    wr_reg(1<<cDec);
    wr_reg(cDigit[cDec]);
    //wr_reg(0b00000000);
    latch_reg();
    cDec += 1;
    if( cDec > 7 )
        cDec = 0; 
        
    TCNT0 = 0;
}

void toDigits(unsigned char i, unsigned long* ulSum) {
    unsigned char j;
    j=4;
    *ulSum=(5000UL*(*ulSum))/(256UL*1024);
    while (j>0) {
        j--;
        cDigit[i+j] = ~cSeg[*ulSum%10];
        *ulSum /=10;
    } 
    *ulSum = 0;
}

#define FIRST_ADC_INPUT 2
#define LAST_ADC_INPUT 3
#define ADC_VREF_TYPE 0x00

unsigned long ulVoltsSum = 0;
char sCounterVSum = 0;

unsigned long ulAmpersSum = 0;
char sCounterASum = 0;

// ADC interrupt service routine
// with auto input scanning
interrupt [ADC_INT] void adc_isr(void)
{
static unsigned char input_index=0;
// Read the AD conversion result
//// Select next ADC input
if (++input_index > LAST_ADC_INPUT)
   input_index=FIRST_ADC_INPUT;
ADMUX=ADC_VREF_TYPE +input_index;

if( input_index == 2 )
{
    ulVoltsSum += ADCW;
    sCounterVSum++;
    if( !sCounterVSum )
    {
        toDigits(0,&ulVoltsSum);
        cDigit[1] &= ~0b10000000;                       
        sCounterVSum = 0;        
    } 
}
if( input_index == 3 )
{   
    ulAmpersSum += ADCW;
    sCounterASum++;
    if( !sCounterASum )
    {
        toDigits(4,&ulAmpersSum);
        cDigit[4] &= ~0b10000000;
        sCounterASum = 0;        
    }
}
                 
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
}

void main(void)
{
// Declare your local variables here

// Crystal Oscillator division factor: 1
/*#pragma optsize-
CLKPR=0x80;
CLKPR=0x00;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif*/

// Input/Output Ports initialization
// Port B initialization
// Func5=In Func4=In Func3=In Func2=In Func1=In Func0=Out 
// State5=T State4=T State3=T State2=T State1=T State0=0 
//PORTB=0x00;
DDRB=0x07;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 9400,000 kHz
// Mode: Normal top=0xFF
// OC0A output: Clear on compare match
// OC0B output: Disconnected
//TCCR0A=0x00;
TCCR0B=0x05;
//TCNT0=0x00;
OCR0A=0x10;
//OCR0B=0x00;

// External Interrupt(s) initialization
// INT0: Off
// Interrupt on any change on pins PCINT0-5: Off
//GIMSK=0x00;
//MCUCR=0x00;

// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=0x04;

// Analog Comparator initialization
// Analog Comparator: Off
ACSR=0x80;
//ADCSRB=0x00;
//DIDR0=0x00;

// ADC initialization
// ADC Clock frequency: 73,438 kHz
// ADC Bandgap Voltage Reference: Off
// ADC Auto Trigger Source: ADC Stopped
// Digital input buffers on ADC0: Off, ADC1: Off, ADC2: On, ADC3: On
DIDR0&=0x03;
DIDR0|=0x24;
ADMUX=FIRST_ADC_INPUT | (ADC_VREF_TYPE & 0xff);
ADCSRA=0xCF;

#asm("sei")

   while(1)
   {
   }
}