/* 
  SPI.h - SPI library for esp8266

  Copyright (c) 2015 Hristo Gochkov. All rights reserved.
  This file is part of the esp8266 core for Arduino environment.
 
  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
*/
#ifndef _SPI_H_INCLUDED
#define _SPI_H_INCLUDED

#include <stdlib.h>
#include "esp32-hal-spi.h"

class SPISettings
{
public:
    SPISettings() :_clock(1000000), _bitOrder(SPI_MSBFIRST), _dataMode(SPI_MODE0) {}
    SPISettings(uint32_t clock, uint8_t bitOrder, uint8_t dataMode) :_clock(clock), _bitOrder(bitOrder), _dataMode(dataMode) {}
    uint32_t _clock;
    uint8_t  _bitOrder;
    uint8_t  _dataMode;
};

class SPIClass
{
public:
    SPIClass(uint8_t spi_bus=HSPI);
    void begin(int8_t sck=-1, int8_t miso=-1, int8_t mosi=-1, int8_t ss=-1);
    void end();

    void setHwCs(bool use);
    void setBitOrder(uint8_t bitOrder);
    void setDataMode(uint8_t dataMode);
    void setFrequency(uint32_t freq);
    void setClockDivider(uint32_t clockDiv);

    void beginTransaction(SPISettings settings);
    void endTransaction(void);

    uint8_t transfer(uint8_t data);
    uint16_t transfer16(uint16_t data);
    uint32_t transfer32(uint32_t data);
    void transferBytes(uint8_t * data, uint8_t * out, uint32_t size);
    void transferBits(uint32_t data, uint32_t * out, uint8_t bits);

    void write(uint8_t data);
    void write16(uint16_t data);
    void write16(uint16_t data, bool msb);
    void write32(uint32_t data);
    void write32(uint32_t data, bool msb);
    void writeBytes(uint8_t * data, uint32_t size);
    void writePattern(uint8_t * data, uint8_t size, uint32_t repeat);
private:
    int8_t _spi_num;
    spi_t * _spi;
    bool _use_hw_ss;
    int8_t _sck;
    int8_t _miso;
    int8_t _mosi;
    int8_t _ss;
    uint32_t _div;
    uint32_t _freq;
    void writePattern_(uint8_t * data, uint8_t size, uint8_t repeat);
};

extern SPIClass SPI;

#endif