trng.h

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/******************************************************************************
*  Filename:       trng.h
*  Revised:        2016-06-30 09:21:03 +0200 (Thu, 30 Jun 2016)
*  Revision:       46799
*
*  Description:    Defines and prototypes for the true random number gen.
*
*  Copyright (c) 2015 - 2016, Texas Instruments Incorporated
*  All rights reserved.
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions are met:
*
*  1) Redistributions of source code must retain the above copyright notice,
*     this list of conditions and the following disclaimer.
*
*  2) 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.
*
*  3) Neither the name of the ORGANIZATION 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 HOLDER OR CONTRIBUTORS BE
*  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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*  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 __TRNG_H__
#define __TRNG_H__

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

#include <stdbool.h>
#include <stdint.h>
#include <inc/hw_types.h>
#include <inc/hw_trng.h>
#include <inc/hw_memmap.h>
#include <inc/hw_ints.h>
#include <driverlib/debug.h>
#include <driverlib/interrupt.h>
#include <driverlib/cpu.h>

//*****************************************************************************
//
// Support for DriverLib in ROM:
// This section renames all functions that are not "static inline", so that
// calling these functions will default to implementation in flash. At the end
// of this file a second renaming will change the defaults to implementation in
// ROM for available functions.
//
// To force use of the implementation in flash, e.g. for debugging:
// - Globally: Define DRIVERLIB_NOROM at project level
// - Per function: Use prefix "NOROM_" when calling the function
//
//*****************************************************************************
#if !defined(DOXYGEN)
    #define TRNGConfigure                   NOROM_TRNGConfigure
    #define TRNGNumberGet                   NOROM_TRNGNumberGet
#endif

//*****************************************************************************
//
//
//
//*****************************************************************************
#define TRNG_NUMBER_READY       0x00000001  //
#define TRNG_FRO_SHUTDOWN       0x00000002  //
#define TRNG_NEED_CLOCK         0x80000000  //

#define TRNG_HI_WORD            0x00000001
#define TRNG_LOW_WORD           0x00000002

//*****************************************************************************
//
// API Function and prototypes
//
//*****************************************************************************

//*****************************************************************************
//
//
//*****************************************************************************
extern void TRNGConfigure(uint32_t ui32MinSamplesPerCycle,
                          uint32_t ui32MaxSamplesPerCycle,
                          uint32_t ui32ClocksPerSample);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGEnable(void)
{
    // Enable the TRNG.
    HWREGBITW(TRNG_BASE + TRNG_O_CTL, TRNG_CTL_TRNG_EN_BITN) = 1;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGDisable(void)
{
    // Enable the TRNG
    HWREGBITW(TRNG_BASE + TRNG_O_CTL, TRNG_CTL_TRNG_EN_BITN) = 0;
}

//*****************************************************************************
//
//
//*****************************************************************************
extern uint32_t TRNGNumberGet(uint32_t ui32Word);

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE uint32_t
TRNGStatusGet(void)
{
    //
    // Return the status.
    //
    return (HWREG(TRNG_BASE + TRNG_O_IRQFLAGSTAT));
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGReset(void)
{
    //
    // Reset the TRNG.
    //
    HWREG(TRNG_BASE + TRNG_O_SWRESET) = 1;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGIntEnable(uint32_t ui32IntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT((ui32IntFlags & TRNG_NUMBER_READY) ||
           (ui32IntFlags & TRNG_FRO_SHUTDOWN));

    //
    // Enable the specified interrupts.
    //
    HWREG(TRNG_BASE + TRNG_O_IRQFLAGMASK) |= ui32IntFlags;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGIntDisable(uint32_t ui32IntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT((ui32IntFlags & TRNG_NUMBER_READY) ||
           (ui32IntFlags & TRNG_FRO_SHUTDOWN));

    //
    // Disable the specified interrupts.
    //
    HWREG(TRNG_BASE + TRNG_O_IRQFLAGMASK) &= ~ui32IntFlags;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE uint32_t
TRNGIntStatus(bool bMasked)
{
    uint32_t ui32Mask;

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        ui32Mask = HWREG(TRNG_BASE + TRNG_O_IRQFLAGMASK);
        return(ui32Mask & HWREG(TRNG_BASE + TRNG_O_IRQFLAGSTAT));
    }
    else
    {
        return(HWREG(TRNG_BASE + TRNG_O_IRQFLAGSTAT) & 0x00000003);
    }
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGIntClear(uint32_t ui32IntFlags)
{
    //
    // Check the arguments.
    //
    ASSERT((ui32IntFlags & TRNG_NUMBER_READY) ||
           (ui32IntFlags & TRNG_FRO_SHUTDOWN));

    //
    // Clear the requested interrupt sources.
    //
    HWREG(TRNG_BASE + TRNG_O_IRQFLAGCLR) = ui32IntFlags;
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGIntRegister(void (*pfnHandler)(void))
{
    //
    // Register the interrupt handler.
    //
    IntRegister(INT_TRNG_IRQ, pfnHandler);

    //
    // Enable the TRNG interrupt.
    //
    IntEnable(INT_TRNG_IRQ);
}

//*****************************************************************************
//
//
//*****************************************************************************
__STATIC_INLINE void
TRNGIntUnregister(void)
{
    //
    // Disable the interrupt.
    //
    IntDisable(INT_TRNG_IRQ);

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

//*****************************************************************************
//
// Support for DriverLib in ROM:
// Redirect to implementation in ROM when available.
//
//*****************************************************************************
#if !defined(DRIVERLIB_NOROM) && !defined(DOXYGEN)
    #include <driverlib/rom.h>
    #ifdef ROM_TRNGConfigure
        #undef  TRNGConfigure
        #define TRNGConfigure                   ROM_TRNGConfigure
    #endif
    #ifdef ROM_TRNGNumberGet
        #undef  TRNGNumberGet
        #define TRNGNumberGet                   ROM_TRNGNumberGet
    #endif
#endif

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

#endif  // __TRNG_H__

//*****************************************************************************
//
//
//*****************************************************************************