// Copyright 2015-2021 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef _SPI_H_INCLUDED
#define _SPI_H_INCLUDED

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

#define SPI_HAS_TRANSACTION

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
{
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;
    bool _inTransaction;
    void writePattern_(const uint8_t * data, uint8_t size, uint8_t repeat);

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);
    
    uint32_t getClockDivider();

    void beginTransaction(SPISettings settings);
    void endTransaction(void);
    void transfer(uint8_t * data, uint32_t size);
    uint8_t transfer(uint8_t data);
    uint16_t transfer16(uint16_t data);
    uint32_t transfer32(uint32_t data);
  
    void transferBytes(const 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 write32(uint32_t data);
    void writeBytes(const uint8_t * data, uint32_t size);
    void writePixels(const void * data, uint32_t size);//ili9341 compatible
    void writePattern(const uint8_t * data, uint8_t size, uint32_t repeat);

    spi_t * bus(){ return _spi; }
};

extern SPIClass SPI;

#endif