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targets/TARGET_Maxim/TARGET_MAX32630/mxc/adc.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /**
be_bryan 0:b74591d5ab33 2 * @file
be_bryan 0:b74591d5ab33 3 * @brief This file contains the function implementations for the Analog to
be_bryan 0:b74591d5ab33 4 * Digital Converter (ADC) peripheral module.
be_bryan 0:b74591d5ab33 5 */
be_bryan 0:b74591d5ab33 6
be_bryan 0:b74591d5ab33 7 /* ****************************************************************************
be_bryan 0:b74591d5ab33 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
be_bryan 0:b74591d5ab33 9 *
be_bryan 0:b74591d5ab33 10 * Permission is hereby granted, free of charge, to any person obtaining a
be_bryan 0:b74591d5ab33 11 * copy of this software and associated documentation files (the "Software"),
be_bryan 0:b74591d5ab33 12 * to deal in the Software without restriction, including without limitation
be_bryan 0:b74591d5ab33 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
be_bryan 0:b74591d5ab33 14 * and/or sell copies of the Software, and to permit persons to whom the
be_bryan 0:b74591d5ab33 15 * Software is furnished to do so, subject to the following conditions:
be_bryan 0:b74591d5ab33 16 *
be_bryan 0:b74591d5ab33 17 * The above copyright notice and this permission notice shall be included
be_bryan 0:b74591d5ab33 18 * in all copies or substantial portions of the Software.
be_bryan 0:b74591d5ab33 19 *
be_bryan 0:b74591d5ab33 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
be_bryan 0:b74591d5ab33 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
be_bryan 0:b74591d5ab33 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
be_bryan 0:b74591d5ab33 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
be_bryan 0:b74591d5ab33 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
be_bryan 0:b74591d5ab33 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
be_bryan 0:b74591d5ab33 26 * OTHER DEALINGS IN THE SOFTWARE.
be_bryan 0:b74591d5ab33 27 *
be_bryan 0:b74591d5ab33 28 * Except as contained in this notice, the name of Maxim Integrated
be_bryan 0:b74591d5ab33 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
be_bryan 0:b74591d5ab33 30 * Products, Inc. Branding Policy.
be_bryan 0:b74591d5ab33 31 *
be_bryan 0:b74591d5ab33 32 * The mere transfer of this software does not imply any licenses
be_bryan 0:b74591d5ab33 33 * of trade secrets, proprietary technology, copyrights, patents,
be_bryan 0:b74591d5ab33 34 * trademarks, maskwork rights, or any other form of intellectual
be_bryan 0:b74591d5ab33 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
be_bryan 0:b74591d5ab33 36 * ownership rights.
be_bryan 0:b74591d5ab33 37 *
be_bryan 0:b74591d5ab33 38 * $Date: 2016-09-09 12:50:50 -0500 (Fri, 09 Sep 2016) $
be_bryan 0:b74591d5ab33 39 * $Revision: 24349 $
be_bryan 0:b74591d5ab33 40 *
be_bryan 0:b74591d5ab33 41 *************************************************************************** */
be_bryan 0:b74591d5ab33 42
be_bryan 0:b74591d5ab33 43 /**
be_bryan 0:b74591d5ab33 44 * @ingroup adc
be_bryan 0:b74591d5ab33 45 * @{
be_bryan 0:b74591d5ab33 46 */
be_bryan 0:b74591d5ab33 47
be_bryan 0:b74591d5ab33 48 /* **** Includes **** */
be_bryan 0:b74591d5ab33 49 #include "mxc_config.h"
be_bryan 0:b74591d5ab33 50 #include "mxc_assert.h"
be_bryan 0:b74591d5ab33 51 #include "mxc_sys.h"
be_bryan 0:b74591d5ab33 52 #include "adc.h"
be_bryan 0:b74591d5ab33 53
be_bryan 0:b74591d5ab33 54 /* **** Definitions **** */
be_bryan 0:b74591d5ab33 55
be_bryan 0:b74591d5ab33 56 /* **** Globals **** */
be_bryan 0:b74591d5ab33 57
be_bryan 0:b74591d5ab33 58 /* **** Functions **** */
be_bryan 0:b74591d5ab33 59
be_bryan 0:b74591d5ab33 60 /* ************************************************************************* */
be_bryan 0:b74591d5ab33 61 int ADC_Init(void)
be_bryan 0:b74591d5ab33 62 {
be_bryan 0:b74591d5ab33 63 int err;
be_bryan 0:b74591d5ab33 64
be_bryan 0:b74591d5ab33 65 if ((err = SYS_ADC_Init()) != E_NO_ERROR) {
be_bryan 0:b74591d5ab33 66 return err;
be_bryan 0:b74591d5ab33 67 }
be_bryan 0:b74591d5ab33 68
be_bryan 0:b74591d5ab33 69 /* Wipe previous configuration */
be_bryan 0:b74591d5ab33 70 MXC_ADC->intr = 0;
be_bryan 0:b74591d5ab33 71
be_bryan 0:b74591d5ab33 72 /* Clear all ADC interrupt flags (W1C) */
be_bryan 0:b74591d5ab33 73 MXC_ADC->intr = MXC_ADC->intr;
be_bryan 0:b74591d5ab33 74
be_bryan 0:b74591d5ab33 75 /* Enable done interrupt */
be_bryan 0:b74591d5ab33 76 MXC_ADC->intr = MXC_F_ADC_INTR_ADC_DONE_IE;
be_bryan 0:b74591d5ab33 77
be_bryan 0:b74591d5ab33 78 /* Power up the ADC */
be_bryan 0:b74591d5ab33 79 MXC_ADC->ctrl = (MXC_F_ADC_CTRL_ADC_PU |
be_bryan 0:b74591d5ab33 80 MXC_F_ADC_CTRL_ADC_CLK_EN |
be_bryan 0:b74591d5ab33 81 MXC_F_ADC_CTRL_BUF_PU |
be_bryan 0:b74591d5ab33 82 MXC_F_ADC_CTRL_ADC_REFBUF_PU |
be_bryan 0:b74591d5ab33 83 MXC_F_ADC_CTRL_ADC_CHGPUMP_PU);
be_bryan 0:b74591d5ab33 84
be_bryan 0:b74591d5ab33 85 return E_NO_ERROR;
be_bryan 0:b74591d5ab33 86 }
be_bryan 0:b74591d5ab33 87
be_bryan 0:b74591d5ab33 88 /* ************************************************************************* */
be_bryan 0:b74591d5ab33 89 void ADC_StartConvert(mxc_adc_chsel_t channel, unsigned int adc_scale, unsigned int bypass)
be_bryan 0:b74591d5ab33 90 {
be_bryan 0:b74591d5ab33 91 uint32_t ctrl_tmp;
be_bryan 0:b74591d5ab33 92
be_bryan 0:b74591d5ab33 93 /* Clear the ADC done flag */
be_bryan 0:b74591d5ab33 94 ADC_ClearFlags(MXC_F_ADC_INTR_ADC_DONE_IF);
be_bryan 0:b74591d5ab33 95
be_bryan 0:b74591d5ab33 96 /* Insert channel selection */
be_bryan 0:b74591d5ab33 97 ctrl_tmp = MXC_ADC->ctrl;
be_bryan 0:b74591d5ab33 98 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_CHSEL);
be_bryan 0:b74591d5ab33 99 ctrl_tmp |= ((channel << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL);
be_bryan 0:b74591d5ab33 100
be_bryan 0:b74591d5ab33 101 /* Clear channel configuration */
be_bryan 0:b74591d5ab33 102 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_REFSCL | MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_BUF_BYPASS);
be_bryan 0:b74591d5ab33 103
be_bryan 0:b74591d5ab33 104 /* ADC reference scaling must be set for all channels but two*/
be_bryan 0:b74591d5ab33 105 if ((channel != ADC_CH_VDD18) && (channel != ADC_CH_VDD12)) {
be_bryan 0:b74591d5ab33 106 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_REFSCL;
be_bryan 0:b74591d5ab33 107 }
be_bryan 0:b74591d5ab33 108
be_bryan 0:b74591d5ab33 109 /* Finalize user-requested channel configuration */
be_bryan 0:b74591d5ab33 110 if (adc_scale || channel > ADC_CH_3) {
be_bryan 0:b74591d5ab33 111 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_SCALE;
be_bryan 0:b74591d5ab33 112 }
be_bryan 0:b74591d5ab33 113 if (bypass) {
be_bryan 0:b74591d5ab33 114 ctrl_tmp |= MXC_F_ADC_CTRL_BUF_BYPASS;
be_bryan 0:b74591d5ab33 115 }
be_bryan 0:b74591d5ab33 116
be_bryan 0:b74591d5ab33 117 /* Write this configuration */
be_bryan 0:b74591d5ab33 118 MXC_ADC->ctrl = ctrl_tmp;
be_bryan 0:b74591d5ab33 119
be_bryan 0:b74591d5ab33 120 /* Start conversion */
be_bryan 0:b74591d5ab33 121 MXC_ADC->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START;
be_bryan 0:b74591d5ab33 122
be_bryan 0:b74591d5ab33 123 }
be_bryan 0:b74591d5ab33 124
be_bryan 0:b74591d5ab33 125 /* ************************************************************************* */
be_bryan 0:b74591d5ab33 126 int ADC_GetData(uint16_t *outdata)
be_bryan 0:b74591d5ab33 127 {
be_bryan 0:b74591d5ab33 128 /* See if a conversion is in process */
be_bryan 0:b74591d5ab33 129 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_ACTIVE) {
be_bryan 0:b74591d5ab33 130 /* Wait for conversion to complete */
be_bryan 0:b74591d5ab33 131 while ((MXC_ADC->intr & MXC_F_ADC_INTR_ADC_DONE_IF) == 0);
be_bryan 0:b74591d5ab33 132 }
be_bryan 0:b74591d5ab33 133
be_bryan 0:b74591d5ab33 134 /* Read 32-bit value and truncate to 16-bit for output depending on data align bit*/
be_bryan 0:b74591d5ab33 135 if((MXC_ADC->ctrl & MXC_F_ADC_CTRL_ADC_DATAALIGN) == 0)
be_bryan 0:b74591d5ab33 136 *outdata = (uint16_t)(MXC_ADC->data); /* LSB justified */
be_bryan 0:b74591d5ab33 137 else
be_bryan 0:b74591d5ab33 138 *outdata = (uint16_t)(MXC_ADC->data >> 6); /* MSB justified */
be_bryan 0:b74591d5ab33 139
be_bryan 0:b74591d5ab33 140 /* Check for overflow */
be_bryan 0:b74591d5ab33 141 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) {
be_bryan 0:b74591d5ab33 142 return E_OVERFLOW;
be_bryan 0:b74591d5ab33 143 }
be_bryan 0:b74591d5ab33 144
be_bryan 0:b74591d5ab33 145 return E_NO_ERROR;
be_bryan 0:b74591d5ab33 146 }
be_bryan 0:b74591d5ab33 147
be_bryan 0:b74591d5ab33 148 /* ************************************************************************* */
be_bryan 0:b74591d5ab33 149 int ADC_SetLimit(mxc_adc_limitsel_t unit, mxc_adc_chsel_t channel,
be_bryan 0:b74591d5ab33 150 unsigned int low_enable, unsigned int low_limit,
be_bryan 0:b74591d5ab33 151 unsigned int high_enable, unsigned int high_limit)
be_bryan 0:b74591d5ab33 152 {
be_bryan 0:b74591d5ab33 153 /* Check args */
be_bryan 0:b74591d5ab33 154 if ((unit >= ADC_LIMIT_MAX) || (channel >= ADC_CH_MAX))
be_bryan 0:b74591d5ab33 155 return E_BAD_PARAM;
be_bryan 0:b74591d5ab33 156
be_bryan 0:b74591d5ab33 157 /* set channel using the limit */
be_bryan 0:b74591d5ab33 158 MXC_ADC->limit[unit] = ((channel << MXC_F_ADC_LIMIT0_CH_SEL_POS) & MXC_F_ADC_LIMIT0_CH_SEL);
be_bryan 0:b74591d5ab33 159
be_bryan 0:b74591d5ab33 160 /* enable/disable the limit*/
be_bryan 0:b74591d5ab33 161 if (low_enable) {
be_bryan 0:b74591d5ab33 162 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN |
be_bryan 0:b74591d5ab33 163 ((low_limit << MXC_F_ADC_LIMIT0_CH_LO_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_LO_LIMIT);
be_bryan 0:b74591d5ab33 164 }
be_bryan 0:b74591d5ab33 165 else{
be_bryan 0:b74591d5ab33 166 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN;
be_bryan 0:b74591d5ab33 167 }
be_bryan 0:b74591d5ab33 168
be_bryan 0:b74591d5ab33 169 if (high_enable) {
be_bryan 0:b74591d5ab33 170 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN |
be_bryan 0:b74591d5ab33 171 ((high_limit << MXC_F_ADC_LIMIT0_CH_HI_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_HI_LIMIT);
be_bryan 0:b74591d5ab33 172 }
be_bryan 0:b74591d5ab33 173 else{
be_bryan 0:b74591d5ab33 174 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN;
be_bryan 0:b74591d5ab33 175 }
be_bryan 0:b74591d5ab33 176
be_bryan 0:b74591d5ab33 177 return E_NO_ERROR;
be_bryan 0:b74591d5ab33 178 }
be_bryan 0:b74591d5ab33 179
be_bryan 0:b74591d5ab33 180 /**@} end of group adc */