xref: /btstack/port/msp432p401lp-cc256x/ti/devices/msp432p4xx/driverlib/fpu.c (revision 5fd0122a3e19d95e11e1f3eb8a08a2b2acb2557e)

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 * Copyright (c) 2017, Texas Instruments Incorporated
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 *    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
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 *    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,
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#include <ti/devices/msp432p4xx/driverlib/fpu.h>

void FPU_enableModule(void)
{
    //
    // Enable the coprocessors used by the floating-point unit.
    //
    SCB->CPACR = ((SCB->CPACR & ~(SCB_CPACR_CP11_MASK | SCB_CPACR_CP10_MASK))
            | SCB_CPACR_CP11_MASK | SCB_CPACR_CP10_MASK);
}

void FPU_disableModule(void)
{
    //
    // Disable the coprocessors used by the floating-point unit.
    //
    SCB->CPACR = ((SCB->CPACR & ~(SCB_CPACR_CP10_MASK | SCB_CPACR_CP11_MASK)));
}

void FPU_enableStacking(void)
{
    //
    // Enable automatic state preservation for the floating-point unit, and
    // disable lazy state preservation (meaning that the floating-point state
    // is always stacked when floating-point instructions are used).
    //
    FPU->FPCCR = (FPU->FPCCR & ~FPU_FPCCR_LSPEN_Msk) | FPU_FPCCR_ASPEN_Msk;
}

void FPU_enableLazyStacking(void)
{
    //
    // Enable automatic and lazy state preservation for the floating-point
    // unit.
    //
    FPU->FPCCR |= FPU_FPCCR_ASPEN_Msk | FPU_FPCCR_LSPEN_Msk;
}

void FPU_disableStacking(void)
{
    //
    // Disable automatic and lazy state preservation for the floating-point
    // unit.
    //
    FPU->FPCCR &= ~(FPU_FPCCR_ASPEN_Msk | FPU_FPCCR_LSPEN_Msk);
}

void FPU_setHalfPrecisionMode(uint32_t mode)
{
    //
    // Set the half-precision floating-point format.
    //
    FPU->FPDSCR = (FPU->FPDSCR & ~(FPU_FPDSCR_AHP_Msk)) | mode;
}

void FPU_setNaNMode(uint32_t mode)
{
    //
    // Set the NaN mode.
    //
    FPU->FPDSCR = (FPU->FPDSCR & ~(FPU_FPDSCR_DN_Msk)) | mode;
}

void FPU_setFlushToZeroMode(uint32_t mode)
{
    //
    // Set the flush-to-zero mode.
    //
    FPU->FPDSCR = (FPU->FPDSCR & ~(FPU_FPDSCR_FZ_Msk)) | mode;
}

void FPU_setRoundingMode(uint32_t mode)
{
    //
    // Set the rounding mode.
    //
    FPU->FPDSCR = (FPU->FPDSCR & ~(FPU_FPDSCR_RMode_Msk)) | mode;
}