//###########################################################################
//
// FILE:   gpio.h
//
// TITLE:  C28x GPIO driver.
//
//###########################################################################
// $TI Release: F2837xD Support Library v3.08.00.00 $
// $Release Date: Mon Dec 23 17:32:30 IST 2019 $
// $Copyright:
// Copyright (C) 2013-2019 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
// 
//   Redistributions of source code must retain the above copyright 
//   notice, this list of conditions and the following disclaimer.
// 
//   Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the 
//   documentation and/or other materials provided with the   
//   distribution.
// 
//   Neither the name of Texas Instruments Incorporated nor the names of
//   its contributors may be used to endorse or promote products derived
//   from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//###########################################################################

#ifndef GPIO_H
#define GPIO_H

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif

//*****************************************************************************
//
//! \addtogroup gpio_api GPIO
//! @{
//
//*****************************************************************************

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_gpio.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/hw_xint.h"
#include "cpu.h"
#include "xbar.h"
#include "debug.h"

//*****************************************************************************
//
// Useful defines used within the driver functions to access gpio registers.
// Not intended for use by application code.
//
// Divide by 2 is for C28x which has word access
//
//*****************************************************************************
#define GPIO_CTRL_REGS_STEP     ((GPIO_O_GPBCTRL - GPIO_O_GPACTRL) / 2U)
#define GPIO_DATA_REGS_STEP     ((GPIO_O_GPBDAT - GPIO_O_GPADAT) / 2U)

#define GPIO_GPxCTRL_INDEX      (GPIO_O_GPACTRL / 2U)
#define GPIO_GPxQSEL_INDEX      (GPIO_O_GPAQSEL1 / 2U)
#define GPIO_GPxMUX_INDEX       (GPIO_O_GPAMUX1 / 2U)
#define GPIO_GPxDIR_INDEX       (GPIO_O_GPADIR / 2U)
#define GPIO_GPxAMSEL_INDEX     (0x00000014U / 2U) // Address rsvd for GPAAMSEL
#define GPIO_GPxPUD_INDEX       (GPIO_O_GPAPUD / 2U)
#define GPIO_GPxINV_INDEX       (GPIO_O_GPAINV / 2U)
#define GPIO_GPxODR_INDEX       (GPIO_O_GPAODR / 2U)
#define GPIO_GPxGMUX_INDEX      (GPIO_O_GPAGMUX1 / 2U)
#define GPIO_GPxCSEL_INDEX      (GPIO_O_GPACSEL1 / 2U)
#define GPIO_GPxLOCK_INDEX      (GPIO_O_GPALOCK / 2U)
#define GPIO_GPxCR_INDEX        (GPIO_O_GPACR / 2U)

#define GPIO_GPxDAT_INDEX       (GPIO_O_GPADAT / 2U)
#define GPIO_GPxSET_INDEX       (GPIO_O_GPASET / 2U)
#define GPIO_GPxCLEAR_INDEX     (GPIO_O_GPACLEAR / 2U)
#define GPIO_GPxTOGGLE_INDEX    (GPIO_O_GPATOGGLE / 2U)

#define GPIO_MUX_TO_GMUX        (GPIO_O_GPAGMUX1 - GPIO_O_GPAMUX1)

#ifndef DOXYGEN_PDF_IGNORE
//*****************************************************************************
//
// Values that can be passed to GPIO_setPadConfig() as the pinType parameter
// and returned by GPIO_getPadConfig().
//
//*****************************************************************************
#define GPIO_PIN_TYPE_STD       0x0000U //!< Push-pull output or floating input
#define GPIO_PIN_TYPE_PULLUP    0x0001U //!< Pull-up enable for input
#define GPIO_PIN_TYPE_INVERT    0x0002U //!< Invert polarity on input
#define GPIO_PIN_TYPE_OD        0x0004U //!< Open-drain on output
#endif

//*****************************************************************************
//
//! Values that can be passed to GPIO_setDirectionMode() as the \e pinIO
//! parameter and returned from GPIO_getDirectionMode().
//
//*****************************************************************************
typedef enum
{
    GPIO_DIR_MODE_IN,                   //!< Pin is a GPIO input
    GPIO_DIR_MODE_OUT                   //!< Pin is a GPIO output
} GPIO_Direction;

//*****************************************************************************
//
//! Values that can be passed to GPIO_setInterruptType() as the \e intType
//! parameter and returned from GPIO_getInterruptType().
//
//*****************************************************************************
typedef enum
{
    GPIO_INT_TYPE_FALLING_EDGE = 0x00,   //!< Interrupt on falling edge
    GPIO_INT_TYPE_RISING_EDGE  = 0x04,   //!< Interrupt on rising edge
    GPIO_INT_TYPE_BOTH_EDGES   = 0x0C    //!< Interrupt on both edges
} GPIO_IntType;

//*****************************************************************************
//
//! Values that can be passed to GPIO_setQualificationMode() as the
//! \e qualification parameter and returned by GPIO_getQualificationMode().
//
//*****************************************************************************
typedef enum
{
    GPIO_QUAL_SYNC,                     //!< Synchronization to SYSCLKOUT
    GPIO_QUAL_3SAMPLE,                  //!< Qualified with 3 samples
    GPIO_QUAL_6SAMPLE,                  //!< Qualified with 6 samples
    GPIO_QUAL_ASYNC                     //!< No synchronization
} GPIO_QualificationMode;

//*****************************************************************************
//
//! Values that can be passed to GPIO_setAnalogMode() as the \e mode parameter.
//
//*****************************************************************************
typedef enum
{
    GPIO_ANALOG_DISABLED,       //!< Pin is in digital mode
    GPIO_ANALOG_ENABLED         //!< Pin is in analog mode
} GPIO_AnalogMode;

//*****************************************************************************
//
//! Values that can be passed to GPIO_setMasterCore() as the \e core parameter.
//
//*****************************************************************************
typedef enum
{
    GPIO_CORE_CPU1,             //!< CPU1 selected as master core
    GPIO_CORE_CPU1_CLA1,        //!< CPU1's CLA1 selected as master core
    GPIO_CORE_CPU2,             //!< CPU2 selected as master core
    GPIO_CORE_CPU2_CLA1         //!< CPU2's CLA1 selected as master core
} GPIO_CoreSelect;

//*****************************************************************************
//
//! Values that can be passed to GPIO_readPortData(), GPIO_setPortPins(),
//! GPIO_clearPortPins(), and GPIO_togglePortPins() as the \e port parameter.
//
//*****************************************************************************
typedef enum
{
    GPIO_PORT_A = 0,                    //!< GPIO port A
    GPIO_PORT_B = 1,                    //!< GPIO port B
    GPIO_PORT_C = 2,                    //!< GPIO port C
    GPIO_PORT_D = 3,                    //!< GPIO port D
    GPIO_PORT_E = 4,                    //!< GPIO port E
    GPIO_PORT_F = 5                     //!< GPIO port F
} GPIO_Port;

//*****************************************************************************
//
//! Values that can be passed to GPIO_setInterruptPin(),
//! GPIO_setInterruptType(), GPIO_getInterruptType(), GPIO_enableInterrupt(),
//! GPIO_disableInterrupt(), as the \e extIntNum parameter.
//
//*****************************************************************************
typedef enum
{
    GPIO_INT_XINT1,                     //!< External Interrupt 1
    GPIO_INT_XINT2,                     //!< External Interrupt 2
    GPIO_INT_XINT3,                     //!< External Interrupt 3
    GPIO_INT_XINT4,                     //!< External Interrupt 4
    GPIO_INT_XINT5                      //!< External Interrupt 5
} GPIO_ExternalIntNum;

//*****************************************************************************
//
// Prototypes for the APIs.
//
//*****************************************************************************
//*****************************************************************************
//
//! \internal
//! Checks that a pin number is valid for a device.
//!
//! Note that this function reflects the highest possible GPIO number of a
//! device on its biggest package. Check the datasheet to see what the actual
//! range of valid pin numbers is for a specific package.
//!
//! \return None.
//
//*****************************************************************************
#ifdef DEBUG
static inline bool
GPIO_isPinValid(uint32_t pin)
{
    return(pin <= 168U);
}
#endif

//*****************************************************************************
//
//! Sets the interrupt type for the specified pin.
//!
//! \param extIntNum specifies the external interrupt.
//! \param intType specifies the type of interrupt trigger mechanism.
//!
//! This function sets up the various interrupt trigger mechanisms for the
//! specified pin on the selected GPIO port.
//!
//! The following defines can be used to specify the external interrupt for the
//! \e extIntNum parameter:
//!
//! - \b GPIO_INT_XINT1
//! - \b GPIO_INT_XINT2
//! - \b GPIO_INT_XINT3
//! - \b GPIO_INT_XINT4
//! - \b GPIO_INT_XINT5
//!
//! One of the following flags can be used to define the \e intType
//! parameter:
//!
//! - \b GPIO_INT_TYPE_FALLING_EDGE sets detection to edge and trigger to
//!   falling
//! - \b GPIO_INT_TYPE_RISING_EDGE sets detection to edge and trigger to rising
//! - \b GPIO_INT_TYPE_BOTH_EDGES sets detection to both edges
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_setInterruptType(GPIO_ExternalIntNum extIntNum, GPIO_IntType intType)
{
    //
    // Write the selected polarity to the appropriate register.
    //
    HWREGH(XINT_BASE + (uint16_t)extIntNum) =
        (HWREGH(XINT_BASE + (uint16_t)extIntNum) & ~XINT_1CR_POLARITY_M) |
        (uint16_t)intType;
}

//*****************************************************************************
//
//! Gets the interrupt type for a pin.
//!
//! \param extIntNum specifies the external interrupt.
//!
//! This function gets the interrupt type for a interrupt. The interrupt can be
//! configured as a falling-edge, rising-edge, or both-edges detected
//! interrupt.
//!
//! The following defines can be used to specify the external interrupt for the
//! \e extIntNum parameter:
//!
//! - \b GPIO_INT_XINT1
//! - \b GPIO_INT_XINT2
//! - \b GPIO_INT_XINT3
//! - \b GPIO_INT_XINT4
//! - \b GPIO_INT_XINT5
//!
//! \return Returns one of the flags described for GPIO_setInterruptType().
//
//*****************************************************************************
static inline GPIO_IntType
GPIO_getInterruptType(GPIO_ExternalIntNum extIntNum)
{
    //
    // Read the selected polarity from the appropriate register.
    //
    return((GPIO_IntType)(HWREGH(XINT_BASE + (uint16_t)extIntNum) &
                          XINT_1CR_POLARITY_M));
}

//*****************************************************************************
//
//! Enables the specified external interrupt.
//!
//! \param extIntNum specifies the external interrupt.
//!
//! This function enables the indicated external interrupt sources.  Only the
//! sources that are enabled can be reflected to the processor interrupt.
//! Disabled sources have no effect on the processor.
//!
//! The following defines can be used to specify the external interrupt for the
//! \e extIntNum parameter:
//!
//! - \b GPIO_INT_XINT1
//! - \b GPIO_INT_XINT2
//! - \b GPIO_INT_XINT3
//! - \b GPIO_INT_XINT4
//! - \b GPIO_INT_XINT5
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_enableInterrupt(GPIO_ExternalIntNum extIntNum)
{
    //
    // Set the enable bit for the specified interrupt.
    //
    HWREGH(XINT_BASE + (uint16_t)extIntNum) |= XINT_1CR_ENABLE;
}

//*****************************************************************************
//
//! Disables the specified external interrupt.
//!
//! \param extIntNum specifies the external interrupt.
//!
//! This function disables the indicated external interrupt sources.  Only the
//! sources that are enabled can be reflected to the processor interrupt.
//! Disabled sources have no effect on the processor.
//!
//! The following defines can be used to specify the external interrupt for the
//! \e extIntNum parameter:
//!
//! - \b GPIO_INT_XINT1
//! - \b GPIO_INT_XINT2
//! - \b GPIO_INT_XINT3
//! - \b GPIO_INT_XINT4
//! - \b GPIO_INT_XINT5
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_disableInterrupt(GPIO_ExternalIntNum extIntNum)
{
    //
    // Clear the enable bit for the specified interrupt
    //
    HWREGH(XINT_BASE + (uint16_t)extIntNum) &= ~XINT_1CR_ENABLE;
}

//*****************************************************************************
//
//! Gets the value of the external interrupt counter.
//!
//! \param extIntNum specifies the external interrupt.
//!
//! The following defines can be used to specify the external interrupt for the
//! \e extIntNum parameter:
//!
//! - \b GPIO_INT_XINT1
//! - \b GPIO_INT_XINT2
//! - \b GPIO_INT_XINT3
//!
//! \b Note: The counter is clocked at the SYSCLKOUT rate.
//!
//! \return Returns external interrupt counter value.
//
//*****************************************************************************
static inline uint16_t
GPIO_getInterruptCounter(GPIO_ExternalIntNum extIntNum)
{
    ASSERT(extIntNum <= GPIO_INT_XINT3);

    //
    // Read the counter value from the appropriate register.
    //
    return((HWREGH(XINT_BASE + XINT_O_1CTR + (uint16_t)extIntNum)));
}

//*****************************************************************************
//
//! Reads the value present on the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//!
//! The value at the specified pin are read, as specified by \e pin. The value
//! is returned for both input and output pins.
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return Returns the value in the data register for the specified pin.
//
//*****************************************************************************
static inline uint32_t
GPIO_readPin(uint32_t pin)
{
    volatile uint32_t *gpioDataReg;

    //
    // Check the arguments.
    //
    ASSERT(GPIO_isPinValid(pin));

    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((pin / 32U) * GPIO_DATA_REGS_STEP);

    return((gpioDataReg[GPIO_GPxDAT_INDEX] >> (pin % 32U)) & (uint32_t)0x1U);
}


//*****************************************************************************
//
//! Writes a value to the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param outVal is the value to write to the pin.
//!
//! Writes the corresponding bit values to the output pin specified by
//! \e pin.  Writing to a pin configured as an input pin has no effect.
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_writePin(uint32_t pin, uint32_t outVal)
{
    volatile uint32_t *gpioDataReg;
    uint32_t pinMask;

    //
    // Check the arguments.
    //
    ASSERT(GPIO_isPinValid(pin));

    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((pin / 32U) * GPIO_DATA_REGS_STEP);

    pinMask = (uint32_t)1U << (pin % 32U);

    if(outVal == 0U)
    {
        gpioDataReg[GPIO_GPxCLEAR_INDEX] = pinMask;
    }
    else
    {
        gpioDataReg[GPIO_GPxSET_INDEX] = pinMask;
    }
}

//*****************************************************************************
//
//! Toggles the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//!
//! Writes the corresponding bit values to the output pin specified by
//! \e pin.  Writing to a pin configured as an input pin has no effect.
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_togglePin(uint32_t pin)
{
    volatile uint32_t *gpioDataReg;

    //
    // Check the arguments.
    //
    ASSERT(GPIO_isPinValid(pin));

    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((pin / 32U) * GPIO_DATA_REGS_STEP);

    gpioDataReg[GPIO_GPxTOGGLE_INDEX] = (uint32_t)1U << (pin % 32U);
}

//*****************************************************************************
//
//! Reads the data on the specified port.
//!
//! \param port is the GPIO port being accessed in the form of \b GPIO_PORT_X
//! where X is the port letter.
//!
//! \return Returns the value available on pin for the specified port. Each
//! bit of the the return value represents a pin on the port, where bit 0
//! represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on.
//
//*****************************************************************************
static inline uint32_t
GPIO_readPortData(GPIO_Port port)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and return DATA.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((uint32_t)port * GPIO_DATA_REGS_STEP);

    return(gpioDataReg[GPIO_GPxDAT_INDEX]);
}


//*****************************************************************************
//
//! Writes a value to the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param outVal is the value to write to the port.
//!
//! This function writes the value \e outVal to the port specified by the
//! \e port parameter which takes a value in the form of \b GPIO_PORT_X where X
//! is the port letter. For example, use \b GPIO_PORT_A to affect port A
//! (GPIOs 0-31).
//!
//! The \e outVal is a bit-packed value, where each bit represents a bit on a
//! GPIO port. Bit 0 represents GPIO port pin 0, bit 1 represents GPIO port
//! pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_writePortData(GPIO_Port port, uint32_t outVal)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to DATA.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((uint32_t)port * GPIO_DATA_REGS_STEP);

    gpioDataReg[GPIO_GPxDAT_INDEX] = outVal;
}

//*****************************************************************************
//
//! Sets all of the specified pins on the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param pinMask is a mask of which of the 32 pins on the port are affected.
//!
//! This function sets all of the pins specified by the \e pinMask parameter on
//! the port specified by the \e port parameter which takes a value in the
//! form of \b GPIO_PORT_X where X is the port letter. For example, use
//! \b GPIO_PORT_A to affect port A (GPIOs 0-31).
//!
//! The \e pinMask is a bit-packed value, where each bit that is set identifies
//! the pin to be set. Bit 0 represents GPIO port pin 0, bit 1 represents GPIO
//! port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_setPortPins(GPIO_Port port, uint32_t pinMask)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to SET.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((uint32_t)port * GPIO_DATA_REGS_STEP);

    gpioDataReg[GPIO_GPxSET_INDEX] = pinMask;
}

//*****************************************************************************
//
//! Clears all of the specified pins on the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param pinMask is a mask of which of the 32 pins on the port are affected.
//!
//! This function clears all of the pins specified by the \e pinMask parameter
//! on the port specified by the \e port parameter which takes a value in the
//! form of \b GPIO_PORT_X where X is the port letter. For example, use
//! \b GPIO_PORT_A to affect port A (GPIOs 0-31).
//!
//! The \e pinMask is a bit-packed value, where each bit that is \b set
//! identifies the pin to be cleared. Bit 0 represents GPIO port pin 0, bit 1
//! represents GPIO port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_clearPortPins(GPIO_Port port, uint32_t pinMask)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to CLEAR.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((uint32_t)port * GPIO_DATA_REGS_STEP);

    gpioDataReg[GPIO_GPxCLEAR_INDEX] = pinMask;
}

//*****************************************************************************
//
//! Toggles all of the specified pins on the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param pinMask is a mask of which of the 32 pins on the port are affected.
//!
//! This function toggles all of the pins specified by the \e pinMask parameter
//! on the port specified by the \e port parameter which takes a value in the
//! form of \b GPIO_PORT_X where X is the port letter. For example, use
//! \b GPIO_PORT_A to affect port A (GPIOs 0-31).
//!
//! The \e pinMask is a bit-packed value, where each bit that is set identifies
//! the pin to be toggled. Bit 0 represents GPIO port pin 0, bit 1 represents
//! GPIO port pin 1, and so on.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_togglePortPins(GPIO_Port port, uint32_t pinMask)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to TOGGLE.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIODATA_BASE) +
                  ((uint32_t)port * GPIO_DATA_REGS_STEP);

    gpioDataReg[GPIO_GPxTOGGLE_INDEX] = pinMask;
}

//*****************************************************************************
//
//! Locks the configuration of the specified pins on the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param pinMask is a mask of which of the 32 pins on the port are affected.
//!
//! This function locks the configuration registers of the pins specified by
//! the \e pinMask parameter on the port specified by the \e port parameter
//! which takes a value in the form of \b GPIO_PORT_X where X is the port
//! letter. For example, use \b GPIO_PORT_A to affect port A (GPIOs 0-31).
//!
//! The \e pinMask is a bit-packed value, where each bit that is set identifies
//! the pin to be locked. Bit 0 represents GPIO port pin 0, bit 1 represents
//! GPIO port pin 1, 0xFFFFFFFF represents all pins on that port, and so on.
//!
//! Note that this function is for locking the configuration of a pin such as
//! the pin muxing, direction, open drain mode, and other settings. It does not
//! affect the ability to change the value of the pin.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_lockPortConfig(GPIO_Port port, uint32_t pinMask)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to the lock.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIOCTRL_BASE) +
                  ((uint32_t)port * GPIO_CTRL_REGS_STEP);

    EALLOW;
    gpioDataReg[GPIO_GPxLOCK_INDEX] |= pinMask;
    EDIS;
}

//*****************************************************************************
//
//! Unlocks the configuration of the specified pins on the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param pinMask is a mask of which of the 32 pins on the port are affected.
//!
//! This function unlocks the configuration registers of the pins specified by
//! the \e pinMask parameter on the port specified by the \e port parameter
//! which takes a value in the form of \b GPIO_PORT_X where X is the port
//! letter. For example, use \b GPIO_PORT_A to affect port A (GPIOs 0-31).
//!
//! The \e pinMask is a bit-packed value, where each bit that is set identifies
//! the pin to be unlocked. Bit 0 represents GPIO port pin 0, bit 1 represents
//! GPIO port pin 1, 0xFFFFFFFF represents all pins on that port, and so on.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_unlockPortConfig(GPIO_Port port, uint32_t pinMask)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to the lock.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIOCTRL_BASE) +
                  ((uint32_t)port * GPIO_CTRL_REGS_STEP);

    EALLOW;
    gpioDataReg[GPIO_GPxLOCK_INDEX] &= ~pinMask;
    EDIS;
}

//*****************************************************************************
//
//! Commits the lock configuration of the specified pins on the specified port.
//!
//! \param port is the GPIO port being accessed.
//! \param pinMask is a mask of which of the 32 pins on the port are affected.
//!
//! This function commits the lock configuration registers of the pins
//! specified by the \e pinMask parameter on the port specified by the \e port
//! parameter which takes a value in the form of \b GPIO_PORT_X where X is the
//! port letter. For example, use \b GPIO_PORT_A to affect port A (GPIOs 0-31).
//!
//! The \e pinMask is a bit-packed value, where each bit that is set identifies
//! the pin to be locked. Bit 0 represents GPIO port pin 0, bit 1 represents
//! GPIO port pin 1, 0xFFFFFFFF represents all pins on that port, and so on.
//!
//! Note that once this function is called, GPIO_lockPortConfig() and
//! GPIO_unlockPortConfig() will no longer have any effect on the specified
//! pins.
//!
//! \return None.
//
//*****************************************************************************
static inline void
GPIO_commitPortConfig(GPIO_Port port, uint32_t pinMask)
{
    volatile uint32_t *gpioDataReg;

    //
    // Get the starting address of the port's registers and write to the lock.
    //
    gpioDataReg = (uint32_t *)((uintptr_t)GPIOCTRL_BASE) +
                  ((uint32_t)port * GPIO_CTRL_REGS_STEP);

    EALLOW;
    gpioDataReg[GPIO_GPxCR_INDEX] |= pinMask;
    EDIS;
}

//*****************************************************************************
//
//! Sets the direction and mode of the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param pinIO is the pin direction mode.
//!
//! This function configures the specified pin on the selected GPIO port as
//! either input or output.
//!
//! The parameter \e pinIO is an enumerated data type that can be one of the
//! following values:
//!
//! - \b GPIO_DIR_MODE_IN
//! - \b GPIO_DIR_MODE_OUT
//!
//! where \b GPIO_DIR_MODE_IN specifies that the pin is programmed as an input
//! and \b GPIO_DIR_MODE_OUT specifies that the pin is programmed as an output.
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setDirectionMode(uint32_t pin, GPIO_Direction pinIO);

//*****************************************************************************
//
//! Gets the direction mode of a pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//!
//! This function gets the direction mode for a specified pin.  The pin can be
//! configured as either an input or output The type of direction is returned
//! as an enumerated data type.
//!
//! \return Returns one of the enumerated data types described for
//! GPIO_setDirectionMode().
//
//*****************************************************************************
extern GPIO_Direction
GPIO_getDirectionMode(uint32_t pin);

//*****************************************************************************
//
//! Sets the pin for the specified external interrupt.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param extIntNum specifies the external interrupt.
//!
//! This function sets which pin triggers the selected external interrupt.
//!
//! The following defines can be used to specify the external interrupt for the
//! \e extIntNum parameter:
//!
//! - \b GPIO_INT_XINT1
//! - \b GPIO_INT_XINT2
//! - \b GPIO_INT_XINT3
//! - \b GPIO_INT_XINT4
//! - \b GPIO_INT_XINT5
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \sa XBAR_setInputPin()
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setInterruptPin(uint32_t pin, GPIO_ExternalIntNum extIntNum);

//*****************************************************************************
//
//! Sets the pad configuration for the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param pinType specifies the pin type.
//!
//! This function sets the pin type for the specified pin. The parameter
//! \e pinType can be the following values:
//!
//! - \b GPIO_PIN_TYPE_STD specifies a push-pull output or a floating input
//! - \b GPIO_PIN_TYPE_PULLUP specifies the pull-up is enabled for an input
//! - \b GPIO_PIN_TYPE_OD specifies an open-drain output pin
//! - \b GPIO_PIN_TYPE_INVERT specifies inverted polarity on an input
//!
//! \b GPIO_PIN_TYPE_INVERT may be OR-ed with \b GPIO_PIN_TYPE_STD or
//! \b GPIO_PIN_TYPE_PULLUP.
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setPadConfig(uint32_t pin, uint32_t pinType);

//*****************************************************************************
//
//! Gets the pad configuration for a pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//!
//! This function returns the pin type for the specified pin.  The value
//! returned corresponds to the values used in GPIO_setPadConfig().
//!
//! \return Returns a bit field of the values \b GPIO_PIN_TYPE_STD,
//! \b GPIO_PIN_TYPE_PULLUP, \b GPIO_PIN_TYPE_OD, and \b GPIO_PIN_TYPE_INVERT.
//
//*****************************************************************************
extern uint32_t
GPIO_getPadConfig(uint32_t pin);

//*****************************************************************************
//
//! Sets the qualification mode for the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param qualification specifies the qualification mode of the pin.
//!
//! This function sets the qualification mode for the specified pin. The
//! parameter \e qualification can be one of the following values:
//! - \b GPIO_QUAL_SYNC
//! - \b GPIO_QUAL_3SAMPLE
//! - \b GPIO_QUAL_6SAMPLE
//! - \b GPIO_QUAL_ASYNC
//!
//! To set the qualification sampling period, use
//! GPIO_setQualificationPeriod().
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setQualificationMode(uint32_t pin, GPIO_QualificationMode qualification);

//*****************************************************************************
//
//! Gets the qualification type for the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//!
//! \return Returns the qualification mode in the form of one of the values
//! \b GPIO_QUAL_SYNC, \b GPIO_QUAL_3SAMPLE, \b GPIO_QUAL_6SAMPLE, or
//! \b GPIO_QUAL_ASYNC.
//
//*****************************************************************************
extern GPIO_QualificationMode
GPIO_getQualificationMode(uint32_t pin);

//*****************************************************************************
//
//! Sets the qualification period for a set of pins
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param divider specifies the output drive strength.
//!
//! This function sets the qualification period for a set of \b 8 \b pins,
//! specified by the \e pin parameter. For instance, passing in 3 as the value
//! of \e pin will set the qualification period for GPIO0 through GPIO7, and a
//! value of 98 will set the qualification period for GPIO96 through GPIO103.
//! This is because the register field that configures the divider is shared.
//!
//! To think of this in terms of an equation, configuring \e pin as \b n will
//! configure GPIO (n & ~(7)) through GPIO ((n & ~(7)) + 7).
//!
//! \e divider is the value by which the frequency of SYSCLKOUT is divided. It
//! can be 1 or an even value between 2 and 510 inclusive.
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setQualificationPeriod(uint32_t pin, uint32_t divider);

//*****************************************************************************
//
//! Selects the master core of a specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param core is the core that is master of the specified pin.
//!
//! This function configures which core owns the specified pin's data registers
//! (DATA, SET, CLEAR, and TOGGLE). The \e core parameter is an enumerated data
//! type that specifies the core, such as \b GPIO_CORE_CPU1_CLA1 to make CPU1's
//! CLA1 master of the pin.
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setMasterCore(uint32_t pin, GPIO_CoreSelect core);

//*****************************************************************************
//
//! Sets the analog mode of the specified pin.
//!
//! \param pin is the identifying GPIO number of the pin.
//! \param mode is the selected analog mode.
//!
//! This function configures the specified pin for either analog or digital
//! mode. Not all GPIO pins have the ability to be switched to analog mode,
//! so refer to the technical reference manual for details. This setting should
//! be thought of as another level of muxing.
//!
//! The parameter \e mode is an enumerated data type that can be one of the
//! following values:
//!
//! - \b GPIO_ANALOG_DISABLED - Pin is in digital mode
//! - \b GPIO_ANALOG_ENABLED - Pin is in analog mode
//!
//! The pin is specified by its numerical value. For example, GPIO34 is
//! specified by passing 34 as \e pin.
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setAnalogMode(uint32_t pin, GPIO_AnalogMode mode);

//*****************************************************************************
//
//! Configures the alternate function of a GPIO pin.
//!
//! \param pinConfig is the pin configuration value, specified as only one
//! of the \b GPIO_#_???? values.
//!
//! This function configures the pin mux that selects the peripheral function
//! associated with a particular GPIO pin.  Only one peripheral function at a
//! time can be associated with a GPIO pin, and each peripheral function should
//! only be associated with a single GPIO pin at a time (despite the fact that
//! many of them can be associated with more than one GPIO pin).
//!
//! The available mappings are supplied in <tt>pin_map.h</tt>.
//!
//! \return None.
//
//*****************************************************************************
extern void
GPIO_setPinConfig(uint32_t pinConfig);

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

#endif //  GPIO_H
