92 lines
3.2 KiB
C
92 lines
3.2 KiB
C
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//###########################################################################
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//
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// FILE: dac.c
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//
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// TITLE: C28x DAC driver.
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//
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//###########################################################################
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// $Copyright:
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// Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// $
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//###########################################################################
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#include "dac.h"
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//*****************************************************************************
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//
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// DAC_tuneOffsetTrim()
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//
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//*****************************************************************************
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void
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DAC_tuneOffsetTrim(uint32_t base, float32_t referenceVoltage)
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{
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uint16_t oldOffsetTrim;
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float32_t newOffsetTrim;
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//
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// Check the arguments.
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//
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ASSERT(DAC_isBaseValid(base));
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ASSERT(referenceVoltage > 0U);
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//
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// Get the sign-extended offset trim value
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//
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oldOffsetTrim = (HWREGH(base + DAC_O_TRIM) & DAC_TRIM_OFFSET_TRIM_M);
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oldOffsetTrim = ((oldOffsetTrim & (uint16_t)DAC_REG_BYTE_MASK) ^
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(uint16_t)0x80) - (uint16_t)0x80;
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//
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// Calculate new offset trim value if DAC is operating at a reference
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// voltage other than 2.5v.
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//
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newOffsetTrim = ((float32_t)(2.5 / referenceVoltage) *
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(int16_t)oldOffsetTrim);
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//
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// Check if the new offset trim value is valid
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//
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ASSERT(((int16_t)newOffsetTrim > -129) && ((int16_t)newOffsetTrim < 128));
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//
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// Set the new offset trim value
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//
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EALLOW;
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HWREGH(base + DAC_O_TRIM) = (HWREGH(base + DAC_O_TRIM) &
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~DAC_TRIM_OFFSET_TRIM_M) |
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(int16_t)newOffsetTrim;
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EDIS;
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}
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