ADS7818.h

#ifndef ADS7818_h
#define ADS7871_h
//------------------------------------------------------------------------------
#define nop asm volatile ("nop\n\t")
//------------------------------------------------------------------------------
#define STATIC_ALWAYS_INLINE static inline __attribute__((always_inline))
//------------------------------------------------------------------------------
template<uint8_t ClkPin, uint8_t ConvPin, uint8_t DataPin>
class ADS7818
{
public:
    //----------------------------------------------------------------------------
    void begin()
    {
        fastPinMode(ClkPin, 1);
        fastDigitalWrite(ClkPin, 0);
        fastPinMode(ConvPin, 1);
        fastDigitalWrite(ConvPin, 1);
        fastPinMode(DataPin, 0);
    }
    //----------------------------------------------------------------------------
    inline __attribute__((always_inline))
    uint16_t read()
    {
        uint16_t v = 0;
        fastDigitalWrite(ConvPin, 0);
        fastDigitalWrite(ClkPin, 1);
        fastDigitalWrite(ClkPin, 0);
        fastDigitalWrite(ConvPin, 1);
        fastDigitalWrite(ClkPin, 1);
        fastDigitalWrite(ClkPin, 0);

        readBitFast16(v,  11);
        readBitFast16(v,  10);
        readBitFast16(v,  9);
        readBitFast16(v,  8);
        readBitFast16(v,  7);
        readBitFast16(v,  6);
        readBitFast16(v,  5);
        readBitFast16(v,  4);
        readBitFast16(v,  3);
        readBitFast16(v,  2);
        readBitFast16(v,  1);
        readBitFast16(v,  0);
        return  v;
    }
private:
    //----------------------------------------------------------------------------
    inline __attribute__((always_inline))
    void readBitFast16(uint16_t &v, uint8_t b)
    {
        fastDigitalWrite(ClkPin, 1);
        if (fastDigitalRead(DataPin)) {
            v |= (1 << b);
        }
        fastDigitalWrite(ClkPin, 0);
    }
};
#if 0

STATIC_ALWAYS_INLINE void adcBegin()
{
    fastPinMode(ADC_CLK_PIN, 1);
    fastDigitalWrite(ADC_CLK_PIN, 0);
    fastPinMode(ADC_CONV_PIN, 1);
    fastDigitalWrite(ADC_CONV_PIN, 1);
    fastPinMode(ADC_DATA_PIN, 0);
}
//------------------------------------------------------------------------------
STATIC_ALWAYS_INLINE void fastDummy(bool first)
{
    if (!first) {
        nop;
    }
    fastDigitalWrite(ADC_CLK_PIN, 1);
    nop;
    fastDigitalWrite(ADC_CLK_PIN, 0);
}
//------------------------------------------------------------------------------
STATIC_ALWAYS_INLINE void readBitFast16(uint16_t &v, uint8_t b)
{
    fastDigitalWrite(ADC_CLK_PIN, 1);
    if (fastDigitalRead(ADC_DATA_PIN)) {
        v |= (1 << b);
    }
    fastDigitalWrite(ADC_CLK_PIN, 0);
}
//------------------------------------------------------------------------------
STATIC_ALWAYS_INLINE uint16_t adcRead(bool centered = false)
{
    uint16_t v = 0;
    fastDigitalWrite(ADC_CONV_PIN, 0);
    fastDigitalWrite(ADC_CLK_PIN, 1);
    fastDigitalWrite(ADC_CLK_PIN, 0);
    fastDigitalWrite(ADC_CONV_PIN, 1);
    fastDigitalWrite(ADC_CLK_PIN, 1);
    fastDigitalWrite(ADC_CLK_PIN, 0);
    //  uint16_t v = 0;

    //  fastDummy(1);
    //  fastDummy(0);
    //  fastDummy(0);
    // fastDummy(0);

    //  readBitFast16(v,  15);
    //  readBitFast16(v,  14);
    //  readBitFast16(v,  13);
    //  readBitFast16(v,  12);
    readBitFast16(v,  11);
    readBitFast16(v,  10);
    readBitFast16(v,  9);
    readBitFast16(v,  8);
    readBitFast16(v,  7);
    readBitFast16(v,  6);
    readBitFast16(v,  5);
    readBitFast16(v,  4);
    readBitFast16(v,  3);
    readBitFast16(v,  2);
    readBitFast16(v,  1);
    readBitFast16(v,  0);
    return centered ? v ^ 0X8000 : v;
}
#endif  // 0
#endif  // ADS7818_h