mirror of https://github.com/ARMmbed/mbed-os.git
181 lines
5.7 KiB
C
181 lines
5.7 KiB
C
/**
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* @file
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* @brief This file contains the function implementations for the Analog to
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* Digital Converter (ADC) peripheral module.
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*/
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/* ****************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2016-09-09 12:50:50 -0500 (Fri, 09 Sep 2016) $
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* $Revision: 24349 $
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*
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*************************************************************************** */
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/**
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* @ingroup adc
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* @{
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*/
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/* **** Includes **** */
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#include "mxc_config.h"
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#include "mxc_assert.h"
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#include "mxc_sys.h"
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#include "adc.h"
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/* **** Definitions **** */
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/* **** Globals **** */
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/* **** Functions **** */
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/* ************************************************************************* */
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int ADC_Init(void)
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{
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int err;
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if ((err = SYS_ADC_Init()) != E_NO_ERROR) {
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return err;
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}
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/* Wipe previous configuration */
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MXC_ADC->intr = 0;
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/* Clear all ADC interrupt flags (W1C) */
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MXC_ADC->intr = MXC_ADC->intr;
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/* Enable done interrupt */
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MXC_ADC->intr = MXC_F_ADC_INTR_ADC_DONE_IE;
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/* Power up the ADC */
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MXC_ADC->ctrl = (MXC_F_ADC_CTRL_ADC_PU |
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MXC_F_ADC_CTRL_ADC_CLK_EN |
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MXC_F_ADC_CTRL_BUF_PU |
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MXC_F_ADC_CTRL_ADC_REFBUF_PU |
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MXC_F_ADC_CTRL_ADC_CHGPUMP_PU);
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return E_NO_ERROR;
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}
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/* ************************************************************************* */
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void ADC_StartConvert(mxc_adc_chsel_t channel, unsigned int adc_scale, unsigned int bypass)
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{
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uint32_t ctrl_tmp;
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/* Clear the ADC done flag */
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ADC_ClearFlags(MXC_F_ADC_INTR_ADC_DONE_IF);
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/* Insert channel selection */
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ctrl_tmp = MXC_ADC->ctrl;
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ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_CHSEL);
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ctrl_tmp |= ((channel << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL);
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/* Clear channel configuration */
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ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_REFSCL | MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_BUF_BYPASS);
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/* ADC reference scaling must be set for all channels but two*/
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if ((channel != ADC_CH_VDD18) && (channel != ADC_CH_VDD12)) {
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ctrl_tmp |= MXC_F_ADC_CTRL_ADC_REFSCL;
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}
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/* Finalize user-requested channel configuration */
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if (adc_scale || channel > ADC_CH_3) {
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ctrl_tmp |= MXC_F_ADC_CTRL_ADC_SCALE;
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}
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if (bypass) {
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ctrl_tmp |= MXC_F_ADC_CTRL_BUF_BYPASS;
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}
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/* Write this configuration */
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MXC_ADC->ctrl = ctrl_tmp;
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/* Start conversion */
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MXC_ADC->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START;
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}
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/* ************************************************************************* */
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int ADC_GetData(uint16_t *outdata)
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{
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/* See if a conversion is in process */
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if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_ACTIVE) {
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/* Wait for conversion to complete */
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while ((MXC_ADC->intr & MXC_F_ADC_INTR_ADC_DONE_IF) == 0);
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}
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/* Read 32-bit value and truncate to 16-bit for output depending on data align bit*/
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if((MXC_ADC->ctrl & MXC_F_ADC_CTRL_ADC_DATAALIGN) == 0)
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*outdata = (uint16_t)(MXC_ADC->data); /* LSB justified */
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else
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*outdata = (uint16_t)(MXC_ADC->data >> 6); /* MSB justified */
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/* Check for overflow */
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if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) {
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return E_OVERFLOW;
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}
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return E_NO_ERROR;
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}
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/* ************************************************************************* */
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int ADC_SetLimit(mxc_adc_limitsel_t unit, mxc_adc_chsel_t channel,
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unsigned int low_enable, unsigned int low_limit,
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unsigned int high_enable, unsigned int high_limit)
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{
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/* Check args */
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if ((unit >= ADC_LIMIT_MAX) || (channel >= ADC_CH_MAX))
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return E_BAD_PARAM;
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/* set channel using the limit */
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MXC_ADC->limit[unit] = ((channel << MXC_F_ADC_LIMIT0_CH_SEL_POS) & MXC_F_ADC_LIMIT0_CH_SEL);
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/* enable/disable the limit*/
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if (low_enable) {
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MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN |
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((low_limit << MXC_F_ADC_LIMIT0_CH_LO_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_LO_LIMIT);
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}
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else{
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MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN;
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}
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if (high_enable) {
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MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN |
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((high_limit << MXC_F_ADC_LIMIT0_CH_HI_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_HI_LIMIT);
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}
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else{
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MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN;
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}
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return E_NO_ERROR;
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}
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/**@} end of group adc */
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