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targets/TARGET_Maxim/TARGET_MAX32625/mxc/adc.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /**
group-onsemi 0:098463de4c5d 2 * @file adc.c
group-onsemi 0:098463de4c5d 3 * @brief This file contains the function implementations for the Analog to
group-onsemi 0:098463de4c5d 4 * Digital Converter (ADC) peripheral module.
group-onsemi 0:098463de4c5d 5 */
group-onsemi 0:098463de4c5d 6
group-onsemi 0:098463de4c5d 7 /* ****************************************************************************
group-onsemi 0:098463de4c5d 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
group-onsemi 0:098463de4c5d 9 *
group-onsemi 0:098463de4c5d 10 * Permission is hereby granted, free of charge, to any person obtaining a
group-onsemi 0:098463de4c5d 11 * copy of this software and associated documentation files (the "Software"),
group-onsemi 0:098463de4c5d 12 * to deal in the Software without restriction, including without limitation
group-onsemi 0:098463de4c5d 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
group-onsemi 0:098463de4c5d 14 * and/or sell copies of the Software, and to permit persons to whom the
group-onsemi 0:098463de4c5d 15 * Software is furnished to do so, subject to the following conditions:
group-onsemi 0:098463de4c5d 16 *
group-onsemi 0:098463de4c5d 17 * The above copyright notice and this permission notice shall be included
group-onsemi 0:098463de4c5d 18 * in all copies or substantial portions of the Software.
group-onsemi 0:098463de4c5d 19 *
group-onsemi 0:098463de4c5d 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
group-onsemi 0:098463de4c5d 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
group-onsemi 0:098463de4c5d 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
group-onsemi 0:098463de4c5d 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
group-onsemi 0:098463de4c5d 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
group-onsemi 0:098463de4c5d 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
group-onsemi 0:098463de4c5d 26 * OTHER DEALINGS IN THE SOFTWARE.
group-onsemi 0:098463de4c5d 27 *
group-onsemi 0:098463de4c5d 28 * Except as contained in this notice, the name of Maxim Integrated
group-onsemi 0:098463de4c5d 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
group-onsemi 0:098463de4c5d 30 * Products, Inc. Branding Policy.
group-onsemi 0:098463de4c5d 31 *
group-onsemi 0:098463de4c5d 32 * The mere transfer of this software does not imply any licenses
group-onsemi 0:098463de4c5d 33 * of trade secrets, proprietary technology, copyrights, patents,
group-onsemi 0:098463de4c5d 34 * trademarks, maskwork rights, or any other form of intellectual
group-onsemi 0:098463de4c5d 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
group-onsemi 0:098463de4c5d 36 * ownership rights.
group-onsemi 0:098463de4c5d 37 *
group-onsemi 0:098463de4c5d 38 * $Date: 2016-08-02 13:32:46 -0500 (Tue, 02 Aug 2016) $
group-onsemi 0:098463de4c5d 39 * $Revision: 23893 $
group-onsemi 0:098463de4c5d 40 *
group-onsemi 0:098463de4c5d 41 *************************************************************************** */
group-onsemi 0:098463de4c5d 42
group-onsemi 0:098463de4c5d 43 /**
group-onsemi 0:098463de4c5d 44 * @ingroup adc
group-onsemi 0:098463de4c5d 45 * @{
group-onsemi 0:098463de4c5d 46 */
group-onsemi 0:098463de4c5d 47
group-onsemi 0:098463de4c5d 48 /* **** Includes **** */
group-onsemi 0:098463de4c5d 49 #include "mxc_config.h"
group-onsemi 0:098463de4c5d 50 #include "mxc_assert.h"
group-onsemi 0:098463de4c5d 51 #include "mxc_sys.h"
group-onsemi 0:098463de4c5d 52 #include "adc.h"
group-onsemi 0:098463de4c5d 53
group-onsemi 0:098463de4c5d 54 /* **** Definitions **** */
group-onsemi 0:098463de4c5d 55
group-onsemi 0:098463de4c5d 56 /* **** Globals **** */
group-onsemi 0:098463de4c5d 57
group-onsemi 0:098463de4c5d 58 /* **** Functions **** */
group-onsemi 0:098463de4c5d 59
group-onsemi 0:098463de4c5d 60 /* ************************************************************************* */
group-onsemi 0:098463de4c5d 61 int ADC_Init(void)
group-onsemi 0:098463de4c5d 62 {
group-onsemi 0:098463de4c5d 63 int err;
group-onsemi 0:098463de4c5d 64
group-onsemi 0:098463de4c5d 65 if ((err = SYS_ADC_Init()) != E_NO_ERROR) {
group-onsemi 0:098463de4c5d 66 return err;
group-onsemi 0:098463de4c5d 67 }
group-onsemi 0:098463de4c5d 68
group-onsemi 0:098463de4c5d 69 /* Wipe previous configuration */
group-onsemi 0:098463de4c5d 70 MXC_ADC->intr = 0;
group-onsemi 0:098463de4c5d 71
group-onsemi 0:098463de4c5d 72 /* Clear all ADC interrupt flags (W1C) */
group-onsemi 0:098463de4c5d 73 MXC_ADC->intr = MXC_ADC->intr;
group-onsemi 0:098463de4c5d 74
group-onsemi 0:098463de4c5d 75 /* Enable done interrupt */
group-onsemi 0:098463de4c5d 76 MXC_ADC->intr = MXC_F_ADC_INTR_ADC_DONE_IE;
group-onsemi 0:098463de4c5d 77
group-onsemi 0:098463de4c5d 78 /* Power up the ADC */
group-onsemi 0:098463de4c5d 79 MXC_ADC->ctrl = (MXC_F_ADC_CTRL_ADC_PU |
group-onsemi 0:098463de4c5d 80 MXC_F_ADC_CTRL_ADC_CLK_EN |
group-onsemi 0:098463de4c5d 81 MXC_F_ADC_CTRL_BUF_PU |
group-onsemi 0:098463de4c5d 82 MXC_F_ADC_CTRL_ADC_REFBUF_PU |
group-onsemi 0:098463de4c5d 83 MXC_F_ADC_CTRL_ADC_CHGPUMP_PU);
group-onsemi 0:098463de4c5d 84
group-onsemi 0:098463de4c5d 85 return E_NO_ERROR;
group-onsemi 0:098463de4c5d 86 }
group-onsemi 0:098463de4c5d 87
group-onsemi 0:098463de4c5d 88 /* ************************************************************************* */
group-onsemi 0:098463de4c5d 89 void ADC_StartConvert(mxc_adc_chsel_t channel, unsigned int adc_scale, unsigned int bypass)
group-onsemi 0:098463de4c5d 90 {
group-onsemi 0:098463de4c5d 91 uint32_t ctrl_tmp;
group-onsemi 0:098463de4c5d 92
group-onsemi 0:098463de4c5d 93 /* Clear the ADC done flag */
group-onsemi 0:098463de4c5d 94 ADC_ClearFlags(MXC_F_ADC_INTR_ADC_DONE_IF);
group-onsemi 0:098463de4c5d 95
group-onsemi 0:098463de4c5d 96 /* Insert channel selection */
group-onsemi 0:098463de4c5d 97 ctrl_tmp = MXC_ADC->ctrl;
group-onsemi 0:098463de4c5d 98 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_CHSEL);
group-onsemi 0:098463de4c5d 99 ctrl_tmp |= ((channel << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL);
group-onsemi 0:098463de4c5d 100
group-onsemi 0:098463de4c5d 101 /* Clear channel configuration */
group-onsemi 0:098463de4c5d 102 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_REFSCL | MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_BUF_BYPASS);
group-onsemi 0:098463de4c5d 103
group-onsemi 0:098463de4c5d 104 /* ADC reference scaling must be set for all channels but two*/
group-onsemi 0:098463de4c5d 105 if ((channel != ADC_CH_VDD18) && (channel != ADC_CH_VDD12)) {
group-onsemi 0:098463de4c5d 106 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_REFSCL;
group-onsemi 0:098463de4c5d 107 }
group-onsemi 0:098463de4c5d 108
group-onsemi 0:098463de4c5d 109 /* Finalize user-requested channel configuration */
group-onsemi 0:098463de4c5d 110 if (adc_scale || channel > ADC_CH_3) {
group-onsemi 0:098463de4c5d 111 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_SCALE;
group-onsemi 0:098463de4c5d 112 }
group-onsemi 0:098463de4c5d 113 if (bypass) {
group-onsemi 0:098463de4c5d 114 ctrl_tmp |= MXC_F_ADC_CTRL_BUF_BYPASS;
group-onsemi 0:098463de4c5d 115 }
group-onsemi 0:098463de4c5d 116
group-onsemi 0:098463de4c5d 117 /* Write this configuration */
group-onsemi 0:098463de4c5d 118 MXC_ADC->ctrl = ctrl_tmp;
group-onsemi 0:098463de4c5d 119
group-onsemi 0:098463de4c5d 120 /* Start conversion */
group-onsemi 0:098463de4c5d 121 MXC_ADC->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START;
group-onsemi 0:098463de4c5d 122
group-onsemi 0:098463de4c5d 123 }
group-onsemi 0:098463de4c5d 124
group-onsemi 0:098463de4c5d 125 /* ************************************************************************* */
group-onsemi 0:098463de4c5d 126 int ADC_GetData(uint16_t *outdata)
group-onsemi 0:098463de4c5d 127 {
group-onsemi 0:098463de4c5d 128 /* See if a conversion is in process */
group-onsemi 0:098463de4c5d 129 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_ACTIVE) {
group-onsemi 0:098463de4c5d 130 /* Wait for conversion to complete */
group-onsemi 0:098463de4c5d 131 while ((MXC_ADC->intr & MXC_F_ADC_INTR_ADC_DONE_IF) == 0);
group-onsemi 0:098463de4c5d 132 }
group-onsemi 0:098463de4c5d 133
group-onsemi 0:098463de4c5d 134 /* Read 32-bit value and truncate to 16-bit for output depending on data align bit*/
group-onsemi 0:098463de4c5d 135 if((MXC_ADC->ctrl & MXC_F_ADC_CTRL_ADC_DATAALIGN) == 0)
group-onsemi 0:098463de4c5d 136 *outdata = (uint16_t)(MXC_ADC->data); /* LSB justified */
group-onsemi 0:098463de4c5d 137 else
group-onsemi 0:098463de4c5d 138 *outdata = (uint16_t)(MXC_ADC->data >> 6); /* MSB justified */
group-onsemi 0:098463de4c5d 139
group-onsemi 0:098463de4c5d 140 /* Check for overflow */
group-onsemi 0:098463de4c5d 141 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) {
group-onsemi 0:098463de4c5d 142 return E_OVERFLOW;
group-onsemi 0:098463de4c5d 143 }
group-onsemi 0:098463de4c5d 144
group-onsemi 0:098463de4c5d 145 return E_NO_ERROR;
group-onsemi 0:098463de4c5d 146 }
group-onsemi 0:098463de4c5d 147
group-onsemi 0:098463de4c5d 148 /* ************************************************************************* */
group-onsemi 0:098463de4c5d 149 int ADC_SetLimit(mxc_adc_limitsel_t unit, mxc_adc_chsel_t channel,
group-onsemi 0:098463de4c5d 150 unsigned int low_enable, unsigned int low_limit,
group-onsemi 0:098463de4c5d 151 unsigned int high_enable, unsigned int high_limit)
group-onsemi 0:098463de4c5d 152 {
group-onsemi 0:098463de4c5d 153 /* Check args */
group-onsemi 0:098463de4c5d 154 if ((unit >= ADC_LIMIT_MAX) || (channel >= ADC_CH_MAX))
group-onsemi 0:098463de4c5d 155 return E_BAD_PARAM;
group-onsemi 0:098463de4c5d 156
group-onsemi 0:098463de4c5d 157 /* set channel using the limit */
group-onsemi 0:098463de4c5d 158 MXC_ADC->limit[unit] = ((channel << MXC_F_ADC_LIMIT0_CH_SEL_POS) & MXC_F_ADC_LIMIT0_CH_SEL);
group-onsemi 0:098463de4c5d 159
group-onsemi 0:098463de4c5d 160 /* enable/disable the limit*/
group-onsemi 0:098463de4c5d 161 if (low_enable) {
group-onsemi 0:098463de4c5d 162 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN |
group-onsemi 0:098463de4c5d 163 ((low_limit << MXC_F_ADC_LIMIT0_CH_LO_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_LO_LIMIT);
group-onsemi 0:098463de4c5d 164 } else {
group-onsemi 0:098463de4c5d 165 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN;
group-onsemi 0:098463de4c5d 166 }
group-onsemi 0:098463de4c5d 167
group-onsemi 0:098463de4c5d 168 if (high_enable) {
group-onsemi 0:098463de4c5d 169 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN |
group-onsemi 0:098463de4c5d 170 ((high_limit << MXC_F_ADC_LIMIT0_CH_HI_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_HI_LIMIT);
group-onsemi 0:098463de4c5d 171 } else {
group-onsemi 0:098463de4c5d 172 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN;
group-onsemi 0:098463de4c5d 173 }
group-onsemi 0:098463de4c5d 174
group-onsemi 0:098463de4c5d 175 return E_NO_ERROR;
group-onsemi 0:098463de4c5d 176 }
group-onsemi 0:098463de4c5d 177
group-onsemi 0:098463de4c5d 178 /**@} end of group adc */