//*****************************************************************************
//
// flash.c - Driver for programming the on-chip flash.
//
// Copyright (c) 2005-2017 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
//
//   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.
//
//*****************************************************************************

//*****************************************************************************
//
//! \addtogroup flash_api
//! @{
//
//*****************************************************************************

#include "types.h"
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_flash.h"
#include "inc/hw_sysctl.h"
#include "debug.h"
#include "flash.h"
#include "interrupt.h"

//*****************************************************************************
//
// An array that maps the specified memory bank to the appropriate Flash
// Memory Protection Program Enable (FMPPE) register.
//
//*****************************************************************************
static const uint32_t g_pui32FMPPERegs[] =
{
    FLASH_FMPPE0,
    FLASH_FMPPE1,
    FLASH_FMPPE2,
    FLASH_FMPPE3,
    FLASH_FMPPE4,
    FLASH_FMPPE5,
    FLASH_FMPPE6,
    FLASH_FMPPE7,
    FLASH_FMPPE8,
    FLASH_FMPPE9,
    FLASH_FMPPE10,
    FLASH_FMPPE11,
    FLASH_FMPPE12,
    FLASH_FMPPE13,
    FLASH_FMPPE14,
    FLASH_FMPPE15,
};

//*****************************************************************************
//
// An array that maps the specified memory bank to the appropriate Flash
// Memory Protection Read Enable (FMPRE) register.
//
//*****************************************************************************
static const uint32_t g_pui32FMPRERegs[] =
{
    FLASH_FMPRE0,
    FLASH_FMPRE1,
    FLASH_FMPRE2,
    FLASH_FMPRE3,
    FLASH_FMPRE4,
    FLASH_FMPRE5,
    FLASH_FMPRE6,
    FLASH_FMPRE7,
    FLASH_FMPRE8,
    FLASH_FMPRE9,
    FLASH_FMPRE10,
    FLASH_FMPRE11,
    FLASH_FMPRE12,
    FLASH_FMPRE13,
    FLASH_FMPRE14,
    FLASH_FMPRE15,
};

//*****************************************************************************
//
//! Erases a block of flash.
//!
//! \param ui32Address is the start address of the flash block to be erased.
//!
//! This function erases a block of the on-chip flash.  After erasing, the
//! block is filled with 0xFF bytes.  Read-only and execute-only blocks cannot
//! be erased.
//!
//! The flash block size is 16-KB.
//!
//! This function does not return until the block has been erased.
//!
//! \return Returns 0 on success, or -1 if an invalid block address was
//! specified or the block is write-protected.
//
//*****************************************************************************
int32_t
FlashErase(uint32_t ui32Address)
{
    //
    // Check the arguments.
    //
    ASSERT(!(ui32Address & (FLASH_ERASE_SIZE - 1)));

    //
    // Clear the flash access and error interrupts.
    //
    HWREG(FLASH_FCMISC) = (FLASH_FCMISC_AMISC | FLASH_FCMISC_VOLTMISC |
                           FLASH_FCMISC_ERMISC);

    //
    // Erase the block.
    //
    HWREG(FLASH_FMA) = ui32Address;
    HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_ERASE;

    //
    // Wait until the block has been erased.
    //
    while (HWREG(FLASH_FMC) & FLASH_FMC_ERASE)
    {
    }

    //
    // Return an error if an access violation or erase error occurred.
    //
    if (HWREG(FLASH_FCRIS) & (FLASH_FCRIS_ARIS | FLASH_FCRIS_VOLTRIS |
                              FLASH_FCRIS_ERRIS))
    {
        return (-1);
    }

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Programs flash.
//!
//! \param pui32Data is a pointer to the data to be programmed.
//! \param ui32Address is the starting address in flash to be programmed.  Must
//! be a multiple of four.
//! \param ui32Count is the number of bytes to be programmed.  Must be a
//! multiple of four.
//!
//! This function programs a sequence of words into the on-chip flash.
//! Because the flash is programmed one word at a time, the starting address
//! and byte count must both be multiples of four.  It is up to the caller to
//! verify the programmed contents, if such verification is required.
//!
//! This function does not return until the data has been programmed.
//!
//! \return Returns 0 on success, or -1 if a programming error is encountered.
//
//*****************************************************************************
int32_t
FlashProgram(uint32_t *pui32Data, uint32_t ui32Address, uint32_t ui32Count)
{
    //
    // Check the arguments.
    //
    ASSERT(!(ui32Address & 3));
    ASSERT(!(ui32Count & 3));

    //
    // Clear the flash access and error interrupts.
    //
    HWREG(FLASH_FCMISC) = (FLASH_FCMISC_AMISC | FLASH_FCMISC_VOLTMISC |
                           FLASH_FCMISC_INVDMISC | FLASH_FCMISC_PROGMISC);

    //
    // Loop over the words to be programmed.
    //
    while (ui32Count)
    {
        //
        // Set the address of this block of words.
        //
        HWREG(FLASH_FMA) = ui32Address & ~(0x7f);

        //
        // Loop over the words in this 32-word block.
        //
        while (((ui32Address & 0x7c) || (HWREG(FLASH_FWBVAL) == 0)) &&
                (ui32Count != 0))
        {
            //
            // Write this word into the write buffer.
            //
            HWREG(FLASH_FWBN + (ui32Address & 0x7c)) = *pui32Data++;
            ui32Address += 4;
            ui32Count -= 4;
        }

        //
        // Program the contents of the write buffer into flash.
        //
        HWREG(FLASH_FMC2) = FLASH_FMC2_WRKEY | FLASH_FMC2_WRBUF;

        //
        // Wait until the write buffer has been programmed.
        //
        while (HWREG(FLASH_FMC2) & FLASH_FMC2_WRBUF)
        {
        }
    }

    //
    // Return an error if an access violation occurred.
    //
    if (HWREG(FLASH_FCRIS) & (FLASH_FCRIS_ARIS | FLASH_FCRIS_VOLTRIS |
                              FLASH_FCRIS_INVDRIS | FLASH_FCRIS_PROGRIS))
    {
        return (-1);
    }

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Gets the protection setting for a block of flash.
//!
//! \param ui32Address is the start address of the flash block to be queried.
//!
//! This function gets the current protection for the specified block of flash.
//! A block can be read/write, read-only, or execute-only.
//! Read/write blocks can be read, executed, erased, and programmed.  Read-only
//! blocks can be read and executed.  Execute-only blocks can only be executed;
//! processor and debugger data reads are not allowed.
//!
//! \return Returns the protection setting for this block.  See
//! FlashProtectSet() for possible values.
//
//*****************************************************************************
tFlashProtection
FlashProtectGet(uint32_t ui32Address)
{
    uint32_t ui32FMPRE, ui32FMPPE;
    uint32_t ui32Bank;

    //
    // Check the argument.
    //
    ASSERT(!(ui32Address & (FLASH_PROTECT_SIZE - 1)));

    //
    // Calculate the Flash Bank from Base Address, and mask off the Bank
    // from ui32Address for subsequent reference.
    //
    ui32Bank = (((ui32Address / FLASH_PROTECT_SIZE) / 32) % 4);
    ui32Address &= ((FLASH_PROTECT_SIZE * 32) - 1);

    //
    // Read the appropriate flash protection registers for the specified
    // flash bank.
    //
    ui32FMPRE = HWREG(g_pui32FMPRERegs[ui32Bank]);
    ui32FMPPE = HWREG(g_pui32FMPPERegs[ui32Bank]);

    //
    // Check the appropriate protection bits for the block of memory that
    // is specified by the address.
    //
    switch ((((ui32FMPRE >> (ui32Address / FLASH_PROTECT_SIZE)) & 0x1) << 1) |
            ((ui32FMPPE >> (ui32Address / FLASH_PROTECT_SIZE)) & 0x1))
    {
    //
    // This block is marked as execute only (that is, it can not be erased
    // or programmed, and the only reads allowed are via the instruction
    // fetch interface).
    //
    case 0:
    case 1:
    {
        return (FlashExecuteOnly);
    }

    //
    // This block is marked as read only (that is, it can not be erased or
    // programmed).
    //
    case 2:
    {
        return (FlashReadOnly);
    }

    //
    // This block is read/write; it can be read, erased, and programmed.
    //
    case 3:
    default:
    {
        return (FlashReadWrite);
    }
    }
}

//*****************************************************************************
//
//! Sets the protection setting for a block of flash.
//!
//! \param ui32Address is the start address of the flash block to be protected.
//! \param eProtect is the protection to be applied to the block.  Can be one
//! of \b FlashReadWrite, \b FlashReadOnly, or \b FlashExecuteOnly.
//!
//! This function sets the protection for the specified block of flash.
//! Blocks that are read/write can be made read-only or execute-only.
//! Blocks that are read-only can be made execute-only.  Blocks that are
//! execute-only cannot have their protection modified.  Attempts to make the
//! block protection less stringent (that is, read-only to read/write)
//! result in a failure (and are prevented by the hardware).
//!
//! Changes to the flash protection are maintained only until the next reset.
//! This protocol allows the application to be executed in the desired flash
//! protection environment to check for inappropriate flash access (via the
//! flash interrupt).  To make the flash protection permanent, use the
//! FlashProtectSave() function.
//!
//! \return Returns 0 on success, or -1 if an invalid address or an invalid
//! protection was specified.
//
//*****************************************************************************
int32_t
FlashProtectSet(uint32_t ui32Address, tFlashProtection eProtect)
{
    uint32_t ui32ProtectRE, ui32ProtectPE;
    uint32_t ui32Bank;

    //
    // Check the argument.
    //
    ASSERT(!(ui32Address & (FLASH_PROTECT_SIZE - 1)));
    ASSERT((eProtect == FlashReadWrite) || (eProtect == FlashReadOnly) ||
           (eProtect == FlashExecuteOnly));

    //
    // Convert the address into a block number.
    //
    ui32Address /= FLASH_PROTECT_SIZE;

    //
    // ui32Address contains a "raw" block number.  Derive the Flash Bank from
    // the "raw" block number, and convert ui32Address to a "relative"
    // block number.
    //
    ui32Bank = ((ui32Address / 32) % 4);
    ui32Address %= 32;

    //
    // Get the current protection for the specified flash bank.
    //
    ui32ProtectRE = HWREG(g_pui32FMPRERegs[ui32Bank]);
    ui32ProtectPE = HWREG(g_pui32FMPPERegs[ui32Bank]);

    //
    // Set the protection based on the requested protection.
    //
    switch (eProtect)
    {
    //
    // Make this block execute only.
    //
    case FlashExecuteOnly:
    {
        //
        // Turn off the read and program bits for this block.
        //
        ui32ProtectRE &= ~(0x1 << ui32Address);
        ui32ProtectPE &= ~(0x1 << ui32Address);

        //
        // We're done handling this protection.
        //
        break;
    }

    //
    // Make this block read only.
    //
    case FlashReadOnly:
    {
        //
        // The block can not be made read only if it is execute only.
        //
        if (((ui32ProtectRE >> ui32Address) & 0x1) != 0x1)
        {
            return (-1);
        }

        //
        // Make this block read only.
        //
        ui32ProtectPE &= ~(0x1 << ui32Address);

        //
        // We're done handling this protection.
        //
        break;
    }

    //
    // Make this block read/write.
    //
    case FlashReadWrite:
    default:
    {
        //
        // The block can not be made read/write if it is not already
        // read/write.
        //
        if ((((ui32ProtectRE >> ui32Address) & 0x1) != 0x1) ||
                (((ui32ProtectPE >> ui32Address) & 0x1) != 0x1))
        {
            return (-1);
        }

        //
        // The block is already read/write, so there is nothing to do.
        //
        return (0);
    }
    }

    //
    // Set the new protection for the specified flash bank.
    //
    HWREG(g_pui32FMPRERegs[ui32Bank]) = ui32ProtectRE;
    HWREG(g_pui32FMPPERegs[ui32Bank]) = ui32ProtectPE;

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Saves the flash protection settings.
//!
//! This function makes the currently programmed flash protection settings
//! permanent.  This operation is non-reversible; a chip reset or power cycle
//! does not change the flash protection.
//!
//! This function does not return until the protection has been saved.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashProtectSave(void)
{
    uint32_t ui32Temp;

    //
    // Save the entire bank of 8 flash protection registers.
    //
    for (ui32Temp = 0; ui32Temp < 8; ui32Temp++)
    {
        //
        // Tell the flash controller to write the flash protection register.
        //
        HWREG(FLASH_FMA) = ui32Temp;
        HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;

        //
        // Wait until the write has completed.
        //
        while (HWREG(FLASH_FMC) & FLASH_FMC_COMT)
        {
        }
    }

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Gets the user registers.
//!
//! \param pui32User0 is a pointer to the location to store USER Register 0.
//! \param pui32User1 is a pointer to the location to store USER Register 1.
//!
//! This function reads the contents of user registers 0 and 1, and
//! stores them in the specified locations.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashUserGet(uint32_t *pui32User0, uint32_t *pui32User1)
{
    //
    // Verify that the pointers are valid.
    //
    ASSERT(pui32User0 != 0);
    ASSERT(pui32User1 != 0);

    //
    // Get and store the current value of the user registers.
    //
    *pui32User0 = HWREG(FLASH_USERREG0);
    *pui32User1 = HWREG(FLASH_USERREG1);

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Sets the user registers.
//!
//! \param ui32User0 is the value to store in USER Register 0.
//! \param ui32User1 is the value to store in USER Register 1.
//!
//! This function sets the contents of the user registers 0 and 1 to
//! the specified values.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashUserSet(uint32_t ui32User0, uint32_t ui32User1)
{
    //
    // Save the new values into the user registers.
    //
    HWREG(FLASH_USERREG0) = ui32User0;
    HWREG(FLASH_USERREG1) = ui32User1;

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Gets all the user registers.
//!
//! \param pui32User0 is a pointer to the location to store USER Register 0.
//! \param pui32User1 is a pointer to the location to store USER Register 1.
//! \param pui32User2 is a pointer to the location to store USER Register 2.
//! \param pui32User3 is a pointer to the location to store USER Register 3.
//!
//! This function reads the contents of user registers 0, 1, 2 and 3, and
//! stores them in the specified locations.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashAllUserRegisterGet(uint32_t *pui32User0, uint32_t *pui32User1,
                        uint32_t *pui32User2, uint32_t *pui32User3)
{
    //
    // Verify that the pointers are valid.
    //
    ASSERT(pui32User0 != 0);
    ASSERT(pui32User1 != 0);
    ASSERT(pui32User2 != 0);
    ASSERT(pui32User3 != 0);

    //
    // Get and store the current value of the user registers.
    //
    *pui32User0 = HWREG(FLASH_USERREG0);
    *pui32User1 = HWREG(FLASH_USERREG1);
    *pui32User2 = HWREG(FLASH_USERREG2);
    *pui32User3 = HWREG(FLASH_USERREG3);

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Sets the user registers 0 to 3
//!
//! \param ui32User0 is the value to store in USER Register 0.
//! \param ui32User1 is the value to store in USER Register 1.
//! \param ui32User2 is the value to store in USER Register 2.
//! \param ui32User3 is the value to store in USER Register 3.
//!
//! This function sets the contents of the user registers 0, 1, 2 and 3 to
//! the specified values.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashAllUserRegisterSet(uint32_t ui32User0, uint32_t ui32User1,
                        uint32_t ui32User2, uint32_t ui32User3)
{
    //
    // Save the new values into the user registers.
    //
    HWREG(FLASH_USERREG0) = ui32User0;
    HWREG(FLASH_USERREG1) = ui32User1;
    HWREG(FLASH_USERREG2) = ui32User2;
    HWREG(FLASH_USERREG3) = ui32User3;

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Saves the user registers 0 and 1.
//!
//! This function makes the currently programmed user register 0 and 1 settings
//! permanent.  This operation is non-reversible; a chip reset or power cycle
//! does not change the flash protection.
//!
//! This function does not return until the protection has been saved.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashUserSave(void)
{
    //
    // Setting the MSB of FMA will trigger a permanent save of a USER
    // register.  Bit 0 will indicate User 0 (0) or User 1 (1).
    //
    HWREG(FLASH_FMA) = 0x80000000;
    HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;

    //
    // Wait until the write has completed.
    //
    while (HWREG(FLASH_FMC) & FLASH_FMC_COMT)
    {
    }

    //
    // Tell the flash controller to write the USER1 Register.
    //
    HWREG(FLASH_FMA) = 0x80000001;
    HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;

    //
    // Wait until the write has completed.
    //
    while (HWREG(FLASH_FMC) & FLASH_FMC_COMT)
    {
    }

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Saves the user registers.
//!
//! This function makes the currently programmed user register 0, 1, 2 and 3
//! settings permanent.  This operation is non-reversible; a chip reset or
//! power cycle does not change the flash protection.
//!
//! This function does not return until the protection has been saved.
//!
//! \note To ensure data integrity of the user registers, the commits should
//! not be interrupted with a power loss.
//!
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
//
//*****************************************************************************
int32_t
FlashAllUserRegisterSave(void)
{
    uint32_t ui32Index;

    //
    // Setting the MSB of FMA will trigger a permanent save of a USER Register.
    // The 2 least signigicant bits, specify the exact User Register to save.
    // The value of the least significant bits for
    // USER Register 0 is 00,
    // USER Register 1 is 01,
    // USER Register 2 is 10 and
    // USER Register 3 is 11.
    //
    for (ui32Index = 0; ui32Index < 4; ui32Index++)
    {
        //
        // Tell the flash controller to commit a USER Register.
        //
        HWREG(FLASH_FMA) = (0x80000000 + ui32Index);
        HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;

        //
        // Wait until the write has completed.
        //
        while (HWREG(FLASH_FMC) & FLASH_FMC_COMT)
        {
        }
    }

    //
    // Success.
    //
    return (0);
}

//*****************************************************************************
//
//! Registers an interrupt handler for the flash interrupt.
//!
//! \param pfnHandler is a pointer to the function to be called when the flash
//! interrupt occurs.
//!
//! This function sets the handler to be called when the flash interrupt
//! occurs.  The flash controller can generate an interrupt when an invalid
//! flash access occurs, such as trying to program or erase a read-only block,
//! or trying to read from an execute-only block.  It can also generate an
//! interrupt when a program or erase operation has completed.  The interrupt
//! is automatically enabled when the handler is registered.
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
FlashIntRegister(void (*pfnHandler)(void))
{
    //
    // Register the interrupt handler, returning an error if an error occurs.
    //
    IntRegister(INT_FLASH, pfnHandler);

    //
    // Enable the flash interrupt.
    //
    IntEnable(INT_FLASH);
}

//*****************************************************************************
//
//! Unregisters the interrupt handler for the flash interrupt.
//!
//! This function clears the handler to be called when the flash interrupt
//! occurs.  This function also masks off the interrupt in the interrupt
//! controller so that the interrupt handler is no longer called.
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
FlashIntUnregister(void)
{
    //
    // Disable the interrupt.
    //
    IntDisable(INT_FLASH);

    //
    // Unregister the interrupt handler.
    //
    IntUnregister(INT_FLASH);
}

//*****************************************************************************
//
//! Enables individual flash controller interrupt sources.
//!
//! \param ui32IntFlags is a bit mask of the interrupt sources to be enabled.
//! The ui32IntFlags parameter can be the logical OR of any of the following
//! values:
//!
//! - \b FLASH_INT_ACCESS occurs when a program or erase action was attempted
//! on a block of flash that is marked as read-only or execute-only.
//! - \b FLASH_INT_PROGRAM occurs when a programming or erase cycle completes.
//! - \b FLASH_INT_EEPROM occurs when an EEPROM interrupt occurs. The source of
//! the EEPROM interrupt can be determined by reading the EEDONE register.
//! - \b FLASH_INT_VOLTAGE_ERR occurs when the voltage was out of spec during
//! the flash operation and the operation was terminated.
//! - \b FLASH_INT_DATA_ERR occurs when an operation attempts to program a bit that
//! contains a 0 to a 1.
//! - \b FLASH_INT_ERASE_ERR occurs when an erase operation fails.
//! - \b FLASH_INT_PROGRAM_ERR occurs when a program operation fails.
//!
//! This function enables the indicated flash controller interrupt sources.
//! Only the sources that are enabled can be reflected to the processor
//! interrupt; disabled sources have no effect on the processor.
//!
//! \return None.
//
//*****************************************************************************
void
FlashIntEnable(uint32_t ui32IntFlags)
{
    //
    // Enable the specified interrupts.
    //
    HWREG(FLASH_FCIM) |= ui32IntFlags;
}

//*****************************************************************************
//
//! Disables individual flash controller interrupt sources.
//!
//! \param ui32IntFlags is a bit mask of the interrupt sources to be disabled.
//! The ui32IntFlags parameter can be the logical OR of any of the following
//! values:
//!
//! - \b FLASH_INT_ACCESS occurs when a program or erase action was attempted
//! on a block of flash that is marked as read-only or execute-only.
//! - \b FLASH_INT_PROGRAM occurs when a programming or erase cycle completes.
//! - \b FLASH_INT_EEPROM occurs when an EEPROM interrupt occurs. The source of
//! the EEPROM interrupt can be determined by reading the EEDONE register.
//! - \b FLASH_INT_VOLTAGE_ERR occurs when the voltage was out of spec during
//! the flash operation and the operation was terminated.
//! - \b FLASH_INT_DATA_ERR occurs when an operation attempts to program a bit that
//! contains a 0 to a 1.
//! - \b FLASH_INT_ERASE_ERR occurs when an erase operation fails.
//! - \b FLASH_INT_PROGRAM_ERR occurs when a program operation fails.
//!
//! This function disables the indicated flash controller interrupt sources.
//! Only the sources that are enabled can be reflected to the processor
//! interrupt; disabled sources have no effect on the processor.
//!
//! \return None.
//
//*****************************************************************************
void
FlashIntDisable(uint32_t ui32IntFlags)
{
    //
    // Disable the specified interrupts.
    //
    HWREG(FLASH_FCIM) &= ~(ui32IntFlags);
}

//*****************************************************************************
//
//! Gets the current interrupt status.
//!
//! \param bMasked is false if the raw interrupt status is required and true if
//! the masked interrupt status is required.
//!
//! This function returns the interrupt status for the flash controller.
//! Either the raw interrupt status or the status of interrupts that are
//! allowed to reflect to the processor can be returned.
//!
//! \return The current interrupt status, enumerated as a bit field of
//! \b FLASH_INT_ACCESS, \b FLASH_INT_PROGRAM, \b FLASH_INT_EEPROM,
//! FLASH_INT_VOLTAGE_ERR, FLASH_INT_DATA_ERR, FLASH_INT_ERASE_ERR, and
//! FLASH_INT_PROGRAM_ERR.
//
//*****************************************************************************
uint32_t
FlashIntStatus(bool bMasked)
{
    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if (bMasked)
    {
        return (HWREG(FLASH_FCMISC));
    }
    else
    {
        return (HWREG(FLASH_FCRIS));
    }
}

//*****************************************************************************
//
//! Clears flash controller interrupt sources.
//!
//! \param ui32IntFlags is the bit mask of the interrupt sources to be cleared.
//!
//! The specified flash controller interrupt sources are cleared, so that they
//! no longer assert.  The
//! ui32IntFlags parameter can be the logical OR of any of the following
//! values:
//!
//! - \b FLASH_INT_ACCESS occurs when a program or erase action was attempted
//! on a block of flash that is marked as read-only or execute-only.
//! - \b FLASH_INT_PROGRAM occurs when a programming or erase cycle completes.
//! - \b FLASH_INT_EEPROM occurs when an EEPROM interrupt occurs. The source of
//! the EEPROM interrupt can be determined by reading the EEDONE register.
//! - \b FLASH_INT_VOLTAGE_ERR occurs when the voltage was out of spec during
//! the flash operation and the operation was terminated.
//! - \b FLASH_INT_DATA_ERR occurs when an operation attempts to program a bit that
//! contains a 0 to a 1.
//! - \b FLASH_INT_ERASE_ERR occurs when an erase operation fails.
//! - \b FLASH_INT_PROGRAM_ERR occurs when a program operation fails.
//!
//! This function must be called in the interrupt handler to keep the
//! interrupt from being triggered again immediately upon exit.
//!
//! \note Because there is a write buffer in the Cortex-M processor, it may
//! take several clock cycles before the interrupt source is actually cleared.
//! Therefore, it is recommended that the interrupt source be cleared early in
//! the interrupt handler (as opposed to the very last action) to avoid
//! returning from the interrupt handler before the interrupt source is
//! actually cleared.  Failure to do so may result in the interrupt handler
//! being immediately reentered (because the interrupt controller still sees
//! the interrupt source asserted).
//!
//! \return None.
//
//*****************************************************************************
void
FlashIntClear(uint32_t ui32IntFlags)
{
    //
    // Clear the flash interrupt.
    //
    HWREG(FLASH_FCMISC) = ui32IntFlags;
}

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