#ifndef OneWire_Direct_GPIO_h
#define OneWire_Direct_GPIO_h

// This header should ONLY be included by OneWire.cpp.  These defines are
// meant to be private, used within OneWire.cpp, but not exposed to Arduino
// sketches or other libraries which may include OneWire.h.

#include <stdint.h>

// Platform specific I/O definitions

#if defined(__AVR__)
#define PIN_TO_BASEREG(pin)             (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint8_t
#define IO_REG_BASE_ATTR asm("r30")
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, mask)         (((*(base)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask)   ((*((base)+1)) &= ~(mask))
#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)+1)) |= (mask))
#define DIRECT_WRITE_LOW(base, mask)    ((*((base)+2)) &= ~(mask))
#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)+2)) |= (mask))

#elif defined(__MK20DX128__) || defined(__MK20DX256__) || defined(__MK66FX1M0__) || defined(__MK64FX512__)
#define PIN_TO_BASEREG(pin)             (portOutputRegister(pin))
#define PIN_TO_BITMASK(pin)             (1)
#define IO_REG_TYPE uint8_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR __attribute__ ((unused))
#define DIRECT_READ(base, mask)         (*((base)+512))
#define DIRECT_MODE_INPUT(base, mask)   (*((base)+640) = 0)
#define DIRECT_MODE_OUTPUT(base, mask)  (*((base)+640) = 1)
#define DIRECT_WRITE_LOW(base, mask)    (*((base)+256) = 1)
#define DIRECT_WRITE_HIGH(base, mask)   (*((base)+128) = 1)

#elif defined(__MKL26Z64__)
#define PIN_TO_BASEREG(pin)             (portOutputRegister(pin))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint8_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, mask)         ((*((base)+16) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask)   (*((base)+20) &= ~(mask))
#define DIRECT_MODE_OUTPUT(base, mask)  (*((base)+20) |= (mask))
#define DIRECT_WRITE_LOW(base, mask)    (*((base)+8) = (mask))
#define DIRECT_WRITE_HIGH(base, mask)   (*((base)+4) = (mask))

#elif defined(__SAM3X8E__) || defined(__SAM3A8C__) || defined(__SAM3A4C__)
// Arduino 1.5.1 may have a bug in delayMicroseconds() on Arduino Due.
// http://arduino.cc/forum/index.php/topic,141030.msg1076268.html#msg1076268
// If you have trouble with OneWire on Arduino Due, please check the
// status of delayMicroseconds() before reporting a bug in OneWire!
#define PIN_TO_BASEREG(pin)             (&(digitalPinToPort(pin)->PIO_PER))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, mask)         (((*((base)+15)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask)   ((*((base)+5)) = (mask))
#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)+4)) = (mask))
#define DIRECT_WRITE_LOW(base, mask)    ((*((base)+13)) = (mask))
#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)+12)) = (mask))
#ifndef PROGMEM
#define PROGMEM
#endif
#ifndef pgm_read_byte
#define pgm_read_byte(addr) (*(const uint8_t *)(addr))
#endif

#elif defined(__PIC32MX__)
#define PIN_TO_BASEREG(pin)             (portModeRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, mask)         (((*(base+4)) & (mask)) ? 1 : 0)  //PORTX + 0x10
#define DIRECT_MODE_INPUT(base, mask)   ((*(base+2)) = (mask))            //TRISXSET + 0x08
#define DIRECT_MODE_OUTPUT(base, mask)  ((*(base+1)) = (mask))            //TRISXCLR + 0x04
#define DIRECT_WRITE_LOW(base, mask)    ((*(base+8+1)) = (mask))          //LATXCLR  + 0x24
#define DIRECT_WRITE_HIGH(base, mask)   ((*(base+8+2)) = (mask))          //LATXSET + 0x28

#elif defined(ARDUINO_ARCH_ESP8266)
// Special note: I depend on the ESP community to maintain these definitions and
// submit good pull requests.  I can not answer any ESP questions or help you
// resolve any problems related to ESP chips.  Please do not contact me and please
// DO NOT CREATE GITHUB ISSUES for ESP support.  All ESP questions must be asked
// on ESP community forums.
#define PIN_TO_BASEREG(pin)             ((volatile uint32_t*) GPO)
#define PIN_TO_BITMASK(pin)             (1 << pin)
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, mask)         ((GPI & (mask)) ? 1 : 0)    //GPIO_IN_ADDRESS
#define DIRECT_MODE_INPUT(base, mask)   (GPE &= ~(mask))            //GPIO_ENABLE_W1TC_ADDRESS
#define DIRECT_MODE_OUTPUT(base, mask)  (GPE |= (mask))             //GPIO_ENABLE_W1TS_ADDRESS
#define DIRECT_WRITE_LOW(base, mask)    (GPOC = (mask))             //GPIO_OUT_W1TC_ADDRESS
#define DIRECT_WRITE_HIGH(base, mask)   (GPOS = (mask))             //GPIO_OUT_W1TS_ADDRESS

#elif defined(ARDUINO_ARCH_ESP32)
#include <driver/rtc_io.h>
#define PIN_TO_BASEREG(pin)             (0)
#define PIN_TO_BITMASK(pin)             (pin)
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR

static inline __attribute__((always_inline))
IO_REG_TYPE directRead(IO_REG_TYPE pin)
{
    if ( pin < 32 )
        return (GPIO.in >> pin) & 0x1;
    else if ( pin < 40 )
        return (GPIO.in1.val >> (pin - 32)) & 0x1;

    return 0;
}

static inline __attribute__((always_inline))
void directWriteLow(IO_REG_TYPE pin)
{
    if ( pin < 32 )
        GPIO.out_w1tc = ((uint32_t)1 << pin);
    else if ( pin < 34 )
        GPIO.out1_w1tc.val = ((uint32_t)1 << (pin - 32));
}

static inline __attribute__((always_inline))
void directWriteHigh(IO_REG_TYPE pin)
{
    if ( pin < 32 )
        GPIO.out_w1ts = ((uint32_t)1 << pin);
    else if ( pin < 34 )
        GPIO.out1_w1ts.val = ((uint32_t)1 << (pin - 32));
}

static inline __attribute__((always_inline))
void directModeInput(IO_REG_TYPE pin)
{
    if ( digitalPinIsValid(pin) )
    {
        uint32_t rtc_reg(rtc_gpio_desc[pin].reg);

        if ( rtc_reg ) // RTC pins PULL settings
        {
            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].mux);
            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].pullup | rtc_gpio_desc[pin].pulldown);
        }

        if ( pin < 32 )
            GPIO.enable_w1tc = ((uint32_t)1 << pin);
        else
            GPIO.enable1_w1tc.val = ((uint32_t)1 << (pin - 32));

        uint32_t pinFunction((uint32_t)2 << FUN_DRV_S); // what are the drivers?
        pinFunction |= FUN_IE; // input enable but required for output as well?
        pinFunction |= ((uint32_t)2 << MCU_SEL_S);

        ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = pinFunction;

        GPIO.pin[pin].val = 0;
    }
}

static inline __attribute__((always_inline))
void directModeOutput(IO_REG_TYPE pin)
{
    if ( digitalPinIsValid(pin) && pin <= 33 ) // pins above 33 can be only inputs
    {
        uint32_t rtc_reg(rtc_gpio_desc[pin].reg);

        if ( rtc_reg ) // RTC pins PULL settings
        {
            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].mux);
            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].pullup | rtc_gpio_desc[pin].pulldown);
        }

        if ( pin < 32 )
            GPIO.enable_w1ts = ((uint32_t)1 << pin);
        else // already validated to pins <= 33
            GPIO.enable1_w1ts.val = ((uint32_t)1 << (pin - 32));

        uint32_t pinFunction((uint32_t)2 << FUN_DRV_S); // what are the drivers?
        pinFunction |= FUN_IE; // input enable but required for output as well?
        pinFunction |= ((uint32_t)2 << MCU_SEL_S);

        ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = pinFunction;

        GPIO.pin[pin].val = 0;
    }
}

#define DIRECT_READ(base, pin)          directRead(pin)
#define DIRECT_WRITE_LOW(base, pin)     directWriteLow(pin)
#define DIRECT_WRITE_HIGH(base, pin)    directWriteHigh(pin)
#define DIRECT_MODE_INPUT(base, pin)    directModeInput(pin)
#define DIRECT_MODE_OUTPUT(base, pin)   directModeOutput(pin)
// https://github.com/PaulStoffregen/OneWire/pull/47
// https://github.com/stickbreaker/OneWire/commit/6eb7fc1c11a15b6ac8c60e5671cf36eb6829f82c
#ifdef  interrupts
#undef  interrupts
#endif
#ifdef  noInterrupts
#undef  noInterrupts
#endif
#define noInterrupts() {portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;portENTER_CRITICAL(&mux)
#define interrupts() portEXIT_CRITICAL(&mux);}
//#warning "ESP32 OneWire testing"

#elif defined(__SAMD21G18A__)
#define PIN_TO_BASEREG(pin)             portModeRegister(digitalPinToPort(pin))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, mask)         (((*((base)+8)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask)   ((*((base)+1)) = (mask))
#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)+2)) = (mask))
#define DIRECT_WRITE_LOW(base, mask)    ((*((base)+5)) = (mask))
#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)+6)) = (mask))

#elif defined(RBL_NRF51822)
#define PIN_TO_BASEREG(pin)             (0)
#define PIN_TO_BITMASK(pin)             (pin)
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, pin)          nrf_gpio_pin_read(pin)
#define DIRECT_WRITE_LOW(base, pin)     nrf_gpio_pin_clear(pin)
#define DIRECT_WRITE_HIGH(base, pin)    nrf_gpio_pin_set(pin)
#define DIRECT_MODE_INPUT(base, pin)    nrf_gpio_cfg_input(pin, NRF_GPIO_PIN_NOPULL)
#define DIRECT_MODE_OUTPUT(base, pin)   nrf_gpio_cfg_output(pin)

#elif defined(__arc__) /* Arduino101/Genuino101 specifics */

#include "scss_registers.h"
#include "portable.h"
#include "avr/pgmspace.h"

#define GPIO_ID(pin)			(g_APinDescription[pin].ulGPIOId)
#define GPIO_TYPE(pin)			(g_APinDescription[pin].ulGPIOType)
#define GPIO_BASE(pin)			(g_APinDescription[pin].ulGPIOBase)
#define DIR_OFFSET_SS			0x01
#define DIR_OFFSET_SOC			0x04
#define EXT_PORT_OFFSET_SS		0x0A
#define EXT_PORT_OFFSET_SOC		0x50

/* GPIO registers base address */
#define PIN_TO_BASEREG(pin)		((volatile uint32_t *)g_APinDescription[pin].ulGPIOBase)
#define PIN_TO_BITMASK(pin)		pin
#define IO_REG_TYPE			uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR

static inline __attribute__((always_inline))
IO_REG_TYPE directRead(volatile IO_REG_TYPE *base, IO_REG_TYPE pin)
{
    IO_REG_TYPE ret;
    if (SS_GPIO == GPIO_TYPE(pin)) {
        ret = READ_ARC_REG(((IO_REG_TYPE)base + EXT_PORT_OFFSET_SS));
    } else {
        ret = MMIO_REG_VAL_FROM_BASE((IO_REG_TYPE)base, EXT_PORT_OFFSET_SOC);
    }
    return ((ret >> GPIO_ID(pin)) & 0x01);
}

static inline __attribute__((always_inline))
void directModeInput(volatile IO_REG_TYPE *base, IO_REG_TYPE pin)
{
    if (SS_GPIO == GPIO_TYPE(pin)) {
        WRITE_ARC_REG(READ_ARC_REG((((IO_REG_TYPE)base) + DIR_OFFSET_SS)) & ~(0x01 << GPIO_ID(pin)),
			((IO_REG_TYPE)(base) + DIR_OFFSET_SS));
    } else {
        MMIO_REG_VAL_FROM_BASE((IO_REG_TYPE)base, DIR_OFFSET_SOC) &= ~(0x01 << GPIO_ID(pin));
    }
}

static inline __attribute__((always_inline))
void directModeOutput(volatile IO_REG_TYPE *base, IO_REG_TYPE pin)
{
    if (SS_GPIO == GPIO_TYPE(pin)) {
        WRITE_ARC_REG(READ_ARC_REG(((IO_REG_TYPE)(base) + DIR_OFFSET_SS)) | (0x01 << GPIO_ID(pin)),
			((IO_REG_TYPE)(base) + DIR_OFFSET_SS));
    } else {
        MMIO_REG_VAL_FROM_BASE((IO_REG_TYPE)base, DIR_OFFSET_SOC) |= (0x01 << GPIO_ID(pin));
    }
}

static inline __attribute__((always_inline))
void directWriteLow(volatile IO_REG_TYPE *base, IO_REG_TYPE pin)
{
    if (SS_GPIO == GPIO_TYPE(pin)) {
        WRITE_ARC_REG(READ_ARC_REG(base) & ~(0x01 << GPIO_ID(pin)), base);
    } else {
        MMIO_REG_VAL(base) &= ~(0x01 << GPIO_ID(pin));
    }
}

static inline __attribute__((always_inline))
void directWriteHigh(volatile IO_REG_TYPE *base, IO_REG_TYPE pin)
{
    if (SS_GPIO == GPIO_TYPE(pin)) {
        WRITE_ARC_REG(READ_ARC_REG(base) | (0x01 << GPIO_ID(pin)), base);
    } else {
        MMIO_REG_VAL(base) |= (0x01 << GPIO_ID(pin));
    }
}

#define DIRECT_READ(base, pin)		directRead(base, pin)
#define DIRECT_MODE_INPUT(base, pin)	directModeInput(base, pin)
#define DIRECT_MODE_OUTPUT(base, pin)	directModeOutput(base, pin)
#define DIRECT_WRITE_LOW(base, pin)	directWriteLow(base, pin)
#define DIRECT_WRITE_HIGH(base, pin)	directWriteHigh(base, pin)

#elif defined(__riscv)

/*
 * Tested on highfive1
 *
 * Stable results are achieved operating in the
 * two high speed modes of the highfive1.  It
 * seems to be less reliable in slow mode.
 */
#define PIN_TO_BASEREG(pin)             (0)
#define PIN_TO_BITMASK(pin)             digitalPinToBitMask(pin)
#define IO_REG_TYPE uint32_t
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR

static inline __attribute__((always_inline))
IO_REG_TYPE directRead(IO_REG_TYPE mask)
{
    return ((GPIO_REG(GPIO_INPUT_VAL) & mask) != 0) ? 1 : 0;
}

static inline __attribute__((always_inline))
void directModeInput(IO_REG_TYPE mask)
{
    GPIO_REG(GPIO_OUTPUT_XOR)  &= ~mask;
    GPIO_REG(GPIO_IOF_EN)      &= ~mask;

    GPIO_REG(GPIO_INPUT_EN)  |=  mask;
    GPIO_REG(GPIO_OUTPUT_EN) &= ~mask;
}

static inline __attribute__((always_inline))
void directModeOutput(IO_REG_TYPE mask)
{
    GPIO_REG(GPIO_OUTPUT_XOR)  &= ~mask;
    GPIO_REG(GPIO_IOF_EN)      &= ~mask;

    GPIO_REG(GPIO_INPUT_EN)  &= ~mask;
    GPIO_REG(GPIO_OUTPUT_EN) |=  mask;
}

static inline __attribute__((always_inline))
void directWriteLow(IO_REG_TYPE mask)
{
    GPIO_REG(GPIO_OUTPUT_VAL) &= ~mask;
}

static inline __attribute__((always_inline))
void directWriteHigh(IO_REG_TYPE mask)
{
    GPIO_REG(GPIO_OUTPUT_VAL) |= mask;
}

#define DIRECT_READ(base, mask)          directRead(mask)
#define DIRECT_WRITE_LOW(base, mask)     directWriteLow(mask)
#define DIRECT_WRITE_HIGH(base, mask)    directWriteHigh(mask)
#define DIRECT_MODE_INPUT(base, mask)    directModeInput(mask)
#define DIRECT_MODE_OUTPUT(base, mask)   directModeOutput(mask)

#else
#define PIN_TO_BASEREG(pin)             (0)
#define PIN_TO_BITMASK(pin)             (pin)
#define IO_REG_TYPE unsigned int
#define IO_REG_BASE_ATTR
#define IO_REG_MASK_ATTR
#define DIRECT_READ(base, pin)          digitalRead(pin)
#define DIRECT_WRITE_LOW(base, pin)     digitalWrite(pin, LOW)
#define DIRECT_WRITE_HIGH(base, pin)    digitalWrite(pin, HIGH)
#define DIRECT_MODE_INPUT(base, pin)    pinMode(pin,INPUT)
#define DIRECT_MODE_OUTPUT(base, pin)   pinMode(pin,OUTPUT)
#warning "OneWire. Fallback mode. Using API calls for pinMode,digitalRead and digitalWrite. Operation of this library is not guaranteed on this architecture."

#endif

#endif
