SPI.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * SPI.h
 *
 *  Created on: Mar 2, 2016
 *      Author: harry-boe
 *
 */

#pragma once

#include "SPIBase.h"
#include "SPISettings.h"

//#define SPI_DEBUG  1

// for compatibility when porting from Arduino
#define SPI_HAS_TRANSACTION 0

#define SPI_NO 1

class SPIClass : public SPIBase
{
public:
    /* @brief begin()
     *
     * Initializes the SPI bus using the default SPISettings
     */
    void begin() override;

    void end() override
    {
    }

    void beginTransaction(SPISettings mySettings) override;

    void endTransaction() override
    {
#ifdef SPI_DEBUG
        debugf("SPIhw::endTransaction()");
#endif
    }

    unsigned char transfer(unsigned char val) override
    {
        return transfer32(val, 8);
    }

    uint8_t read8();

    unsigned short transfer16(unsigned short val) override
    {
        return transfer32(val, 16);
    };

    void transfer(uint8_t* buffer, size_t numberBytes) override;

private:
    virtual uint32_t transfer32(uint32_t val, uint8_t bits);

    // prepare/configure HSPI with settings
    void prepare(SPISettings mySettings);

    void spi_byte_order(uint8_t byte_order);

    void spi_mode(uint8_t mode);

    void setClock(uint8_t prediv, uint8_t cntdiv);

    uint32_t getFrequency(int freq, int& pre, int clk);
    void setFrequency(int freq);

    SPISettings spiSettings;
    bool isTX = false;
    bool initialised = false;
};

extern SPIClass SPI;