SPI_for_AFE.h

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#ifndef ARDUINO_SPI_FOR_AFE_H
#define ARDUINO_SPI_FOR_AFE_H
 
#include <Arduino.h>
#include <stdint.h>
 
#include <SPI.h>
 
class SPI_for_AFE
{
public:
    virtual void txrx( uint8_t *data, int size );

    virtual void write_r16( uint16_t reg );

    virtual void write_r16( uint16_t reg, uint16_t val );

    virtual uint16_t read_r16( uint16_t reg );

    virtual void write_r24( uint16_t reg, uint32_t val );

    virtual int32_t read_r24( uint16_t reg );

    virtual void burst( uint32_t *data, int length, int width = 3 );

    virtual void spi_frequency( uint32_t frequency = 1000000 );
 
protected:
    void init( void );
    uint32_t    frequency;
 
private:
    //  functions to access AFE multibyte data access independent from endianess
    inline int32_t get_data16( uint8_t *vp )
    {
        return ((uint16_t)(*(vp + 0)) << 8) | *(vp + 1);
    }
    
    inline int32_t get_data24( uint8_t *vp )
    {
        int32_t r0  = *(vp + 0);
        int32_t r1  = *(vp + 1);
        int32_t r2  = *(vp + 2);
        int32_t r   = ( (r0 << 24) | (r1 << 16) | (r2 << 8) );
 
        return r >> 8;
    }
 
    static constexpr int    command_length  = 2;
//  const bool  dev_ad;
};
 
#endif //   ARDUINO_SPI_FOR_AFE_H