yspi.h

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#ifndef YSPI_H
#define YSPI_H


#include <Arduino.h>

#include <SPI.h>

#include "config.h"

class YSPI{
  public:
    virtual void setSS(uint8_t highLow)     const = 0;  
    virtual void beginTransaction()         const = 0;
    virtual uint8_t transfer (uint8_t data) const = 0;
    virtual void endTransaction()           const = 0;
};

class HWSPI : public YSPI{
  protected:
    const uint8_t SS;             
    const SPISettings settings;   
  public:
     HWSPI( uint8_t SSpin, 
           uint32_t clockF, 
           uint8_t bitOrder, 
           uint8_t dataMode);
     
    virtual void setSS(uint8_t highLow)     const;
    virtual void beginTransaction()         const;
    virtual uint8_t transfer (uint8_t data) const;
    virtual void endTransaction()           const;
};


class USARTSPI : public YSPI{
 protected:
  struct usartRegisterStruct {
    volatile uint8_t &udr,      
                     &ucsrA,    
                     &ucsrB,    
                     &ucsrC;    
    volatile uint16_t &ubrr;    
  };
  struct pinRegisterStruct {
    volatile uint8_t &io,   
                     &set;  
  };
  
  struct uartSpecificBitValueStruct {
    const uint8_t   udre,    
                    rxc,     
                    txc,     
                    ddCLK,   
                    ddSS,    
                    umsel0,  
                    umsel1,  
                    txen,    
                    rxen,    
                    portSS;  
  };
  static const usartRegisterStruct usartRegVec[];
  static const pinRegisterStruct  pinRegVec[];
  static const uartSpecificBitValueStruct specificBitVec[];

  const uint8_t uID;
 
 public:
  static const uint8_t nbUARTS;
 
  USARTSPI(uint8_t id);
  virtual void setSS(uint8_t highLow)     const;
  virtual void beginTransaction()         const;
  virtual uint8_t transfer (uint8_t data) const;
  virtual void endTransaction()           const;
};
#endif