#include "Arduino.h"
#include "wiring_private.h"

//this function can instead of SPI
uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {
    uint8_t value = 0;
    uint8_t i;
    pinMode(clockPin, OUTPUT);
    pinMode(dataPin, INPUT);
    for (i = 0; i < 8; ++i) {
        digitalWrite(clockPin, HIGH);
        if (bitOrder == LSBFIRST)
            value |= digitalRead(dataPin) << i;
        else
            value |= digitalRead(dataPin) << (7 - i);
        digitalWrite(clockPin, LOW);
    }
    return value;
}

void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
{
    uint8_t i;
    pinMode(clockPin, OUTPUT);
    pinMode(dataPin, OUTPUT);

    for (i = 0; i < 8; i++)  {
        if (bitOrder == LSBFIRST)
            digitalWrite(dataPin, !!(val & (1 << i)));
        else    
            digitalWrite(dataPin, !!(val & (1 << (7 - i))));
            
        digitalWrite(clockPin, HIGH);
        digitalWrite(clockPin, LOW);        
    }
}