comp.c

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//*****************************************************************************
//
// comp.c - Driver for the analog comparator.
//
// Copyright (c) 2005-2014 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.
// 
// This is part of revision 2.1.0.12573 of the Tiva Peripheral Driver Library.
//
//*****************************************************************************

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

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_comp.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/comp.h"
#include "driverlib/debug.h"
#include "driverlib/interrupt.h"

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorConfigure(uint32_t ui32Base, uint32_t ui32Comp, uint32_t ui32Config)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Configure this comparator.
    //
    HWREG(ui32Base + (ui32Comp * 0x20) + COMP_O_ACCTL0) = ui32Config;
}

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorRefSet(uint32_t ui32Base, uint32_t ui32Ref)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);

    //
    // Set the voltage reference voltage as requested.
    //
    HWREG(ui32Base + COMP_O_ACREFCTL) = ui32Ref;
}

//*****************************************************************************
//
//
//*****************************************************************************
bool
ComparatorValueGet(uint32_t ui32Base, uint32_t ui32Comp)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Return the appropriate value based on the comparator's present output
    // value.
    //
    if(HWREG(ui32Base + (ui32Comp * 0x20) + COMP_O_ACSTAT0) &
       COMP_ACSTAT0_OVAL)
    {
        return(true);
    }
    else
    {
        return(false);
    }
}

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorIntRegister(uint32_t ui32Base, uint32_t ui32Comp,
                      void (*pfnHandler)(void))
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Register the interrupt handler, returning an error if an error occurs.
    //
    IntRegister(INT_COMP0_TM4C123 + ui32Comp, pfnHandler);

    //
    // Enable the interrupt in the interrupt controller.
    //
    IntEnable(INT_COMP0_TM4C123 + ui32Comp);

    //
    // Enable the comparator interrupt.
    //
    HWREG(ui32Base + COMP_O_ACINTEN) |= 1 << ui32Comp;
}

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorIntUnregister(uint32_t ui32Base, uint32_t ui32Comp)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Disable the comparator interrupt.
    //
    HWREG(ui32Base + COMP_O_ACINTEN) &= ~(1 << ui32Comp);

    //
    // Disable the interrupt in the interrupt controller.
    //
    IntDisable(INT_COMP0_TM4C123 + ui32Comp);

    //
    // Unregister the interrupt handler.
    //
    IntUnregister(INT_COMP0_TM4C123 + ui32Comp);
}

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorIntEnable(uint32_t ui32Base, uint32_t ui32Comp)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Enable the comparator interrupt.
    //
    HWREG(ui32Base + COMP_O_ACINTEN) |= 1 << ui32Comp;
}

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorIntDisable(uint32_t ui32Base, uint32_t ui32Comp)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Disable the comparator interrupt.
    //
    HWREG(ui32Base + COMP_O_ACINTEN) &= ~(1 << ui32Comp);
}

//*****************************************************************************
//
//
//*****************************************************************************
bool
ComparatorIntStatus(uint32_t ui32Base, uint32_t ui32Comp, bool bMasked)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Return either the interrupt status or the raw interrupt status as
    // requested.
    //
    if(bMasked)
    {
        return(((HWREG(ui32Base + COMP_O_ACMIS) >> ui32Comp) & 1) ? true :
               false);
    }
    else
    {
        return(((HWREG(ui32Base + COMP_O_ACRIS) >> ui32Comp) & 1) ? true :
               false);
    }
}

//*****************************************************************************
//
//
//*****************************************************************************
void
ComparatorIntClear(uint32_t ui32Base, uint32_t ui32Comp)
{
    //
    // Check the arguments.
    //
    ASSERT(ui32Base == COMP_BASE);
    ASSERT(ui32Comp < 3);

    //
    // Clear the interrupt.
    //
    HWREG(ui32Base + COMP_O_ACMIS) = 1 << ui32Comp;
}

//*****************************************************************************
//
// Close the Doxygen group.
//
//*****************************************************************************