SRPIO.h

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#ifndef SRPIO_H
#define SRPIO_H

#include "GPIO.h"

template<uint8_t BITORDER, BOARD::pin_t DATA_PIN, BOARD::pin_t CLOCK_PIN>
class SRPIO {
public:
  SRPIO()
  {
    m_data.open_drain();
    m_clock.output();
  }

  void write(uint8_t value)
  {
    if (BITORDER == LSBFIRST) {
      uint8_t mask = 1;
      do {
        if (value & mask) m_data.input(); else m_data.output();
        m_clock.toggle();
        mask <<= 1;
        m_clock.toggle();
      } while (mask);
    }
    else {
      uint8_t mask = 0x80;
      do {
        if (value & mask) m_data.input(); else m_data.output();
        m_clock.toggle();
        mask >>= 1;
        m_clock.toggle();
      } while (mask);
    }
    m_data.input();
  }

  void operator<<(uint8_t value)
  {
    write(value);
  }

  uint8_t read()
  {
    uint8_t res = 0;
    if (BITORDER == LSBFIRST) {
      uint8_t mask = 1;
      do {
        m_clock.toggle();
        res |= (m_data ? mask : 0);
        m_clock.toggle();
        mask <<= 1;
      } while (mask);
    }
    else {
      uint8_t mask = 0x80;
      do {
        m_clock.toggle();
        res |= (m_data ? mask : 0);
        m_clock.toggle();
        mask >>= 1;
      } while (mask);
    }
    return (res);
  }

  void operator>>(uint8_t& value)
  {
    value = read();
  }

protected:
  GPIO<DATA_PIN> m_data;
  GPIO<CLOCK_PIN> m_clock;
};

#endif