SPIWrapper.h

/*
  SPIWrapper.h 
  Copyright (c) 2025 Phil Schatzmann. All right reserved.
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
 
#pragma once
#include "Sources.h"
#include "api/HardwareSPI.h"
 
namespace arduino {
 
class SPIWrapper : public HardwareSPI {
 public:
  SPIWrapper() = default;
  SPIWrapper(SPISource& source) { setSource(&source); }
  SPIWrapper(HardwareSPI& spi) { setSPI(&spi); }
  ~SPIWrapper() = default;
  void begin();
  void end();
  uint8_t transfer(uint8_t data);
  uint16_t transfer16(uint16_t data);
  void transfer(void* data, size_t count);
  void usingInterrupt(int interruptNumber);
  void notUsingInterrupt(int interruptNumber);
  void beginTransaction(SPISettings settings);
  void endTransaction(void);
  void attachInterrupt();
  void detachInterrupt();
 
  void setSPI(HardwareSPI* spi) {
    p_spi = spi;
    p_source = nullptr;
  }
  void setSource(SPISource* source) {
    p_source = source;
    p_spi = nullptr;
  }
 
 protected:
  HardwareSPI* p_spi = nullptr;
  SPISource* p_source = nullptr;
 
  HardwareSPI* getSPI() {
    HardwareSPI* result = p_spi;
    if (result == nullptr && p_source != nullptr) {
      result = p_source->getSPI();
    }
    return result;
  }
};
 
extern SPIWrapper SPI;
 
}  // namespace arduino