126 lines
4.7 KiB
C
126 lines
4.7 KiB
C
/*-----------------------------------------------------------------------------
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* Name: ADC_XMC4500.c
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* Purpose: A/D Converter interface for Infineon XMC4500 Relax Kit
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* Rev.: 1.00
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*----------------------------------------------------------------------------*/
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/* Copyright (c) 2013 - 2015 ARM LIMITED
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All rights reserved.
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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 are met:
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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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- 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 distribution.
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- Neither the name of ARM nor the names of its contributors may be used
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to endorse or promote products derived from this software without
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specific prior written permission.
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*
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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---------------------------------------------------------------------------*/
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#include "xmc_vadc.h"
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#include "Board_ADC.h"
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#define ADC_RESOLUTION 12 /* Number of A/D converter bits */
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/**
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\fn int32_t ADC_Initialize (void)
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\brief Initialize Analog-to-Digital Converter
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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int32_t ADC_Initialize (void) {
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//Enable the VADC module
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XMC_SCU_RESET_DeassertPeripheralReset(XMC_SCU_PERIPHERAL_RESET_VADC);
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VADC->CLC = 0; /* enable the VADC module clock */
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VADC->GLOBCFG = ((1UL << 15) | /* enable DIVA write control */
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(6UL << 0) ); /* set DIVA to 6 */
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//Enable arbitration slot 02, priority set to 1
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XMC_VADC_GROUP_BackgroundEnableArbitrationSlot(VADC_G0);
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//Add a channel into the scan sequence Group 0 channel 0 (P14.1)
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XMC_VADC_GLOBAL_BackgroundAddChannelToSequence(VADC,0,1);
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VADC_G0->ARBCFG = ((3UL << 16) | /* ANONS normal operation */
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(3UL << 0) ); /* ANONC normal operation */
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VADC->BRSMR = ((1UL << 0)); /* ENGT = 01B */
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return 0;
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}
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/**
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\fn int32_t ADC_Uninitialize (void)
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\brief De-initialize Analog-to-Digital Converter
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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int32_t ADC_Uninitialize (void) {
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//Disable the VADC module
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XMC_SCU_RESET_AssertPeripheralReset(XMC_SCU_PERIPHERAL_RESET_VADC);
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return 0;
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}
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/**
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\fn int32_t ADC_StartConversion (void)
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\brief Start conversion
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\returns
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- \b 0: function succeeded
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- \b -1: function failed
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*/
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int32_t ADC_StartConversion (void) {
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// Generates conversion request
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XMC_VADC_GLOBAL_BackgroundTriggerConversion(VADC);
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return 0;
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}
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/**
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\fn int32_t ADC_ConversionDone (void)
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\brief Check if conversion finished
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\returns
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- \b 0: conversion finished
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- \b -1: conversion in progress
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*/
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int32_t ADC_ConversionDone (void) {
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XMC_VADC_GROUP_STATE_t status;
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status = XMC_VADC_GROUP_IsConverterBusy(VADC_G0);
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return ((status == XMC_VADC_GROUP_STATE_IDLE) ? 0 : -1);
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}
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/**
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\fn int32_t ADC_GetValue (void)
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\brief Get converted value
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\returns
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- <b> >=0</b>: converted value
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- \b -1: conversion in progress or failed
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*/
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int32_t ADC_GetValue (void) {
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//Return the result value of the result register
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if (ADC_ConversionDone() != 0) return -1;
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return (int32_t) XMC_VADC_GROUP_GetResult(VADC_G0,0);
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}
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/**
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\fn uint32_t ADC_GetResolution (void)
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\brief Get resolution of Analog-to-Digital Converter
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\returns Resolution (in bits)
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*/
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uint32_t ADC_GetResolution (void) {
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return ADC_RESOLUTION;
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}
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