mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

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targets/TARGET_Maxim/TARGET_MAX32620C/mxc/adc.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /**
Anna Bridge 186:707f6e361f3e 2 * @file
Anna Bridge 186:707f6e361f3e 3 * @brief This file contains the function implementations for the Analog to
Anna Bridge 186:707f6e361f3e 4 * Digital Converter (ADC) peripheral module.
Anna Bridge 186:707f6e361f3e 5 */
Anna Bridge 186:707f6e361f3e 6
Anna Bridge 186:707f6e361f3e 7 /* ****************************************************************************
Anna Bridge 186:707f6e361f3e 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
Anna Bridge 186:707f6e361f3e 9 *
Anna Bridge 186:707f6e361f3e 10 * Permission is hereby granted, free of charge, to any person obtaining a
Anna Bridge 186:707f6e361f3e 11 * copy of this software and associated documentation files (the "Software"),
Anna Bridge 186:707f6e361f3e 12 * to deal in the Software without restriction, including without limitation
Anna Bridge 186:707f6e361f3e 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
Anna Bridge 186:707f6e361f3e 14 * and/or sell copies of the Software, and to permit persons to whom the
Anna Bridge 186:707f6e361f3e 15 * Software is furnished to do so, subject to the following conditions:
Anna Bridge 186:707f6e361f3e 16 *
Anna Bridge 186:707f6e361f3e 17 * The above copyright notice and this permission notice shall be included
Anna Bridge 186:707f6e361f3e 18 * in all copies or substantial portions of the Software.
Anna Bridge 186:707f6e361f3e 19 *
Anna Bridge 186:707f6e361f3e 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
Anna Bridge 186:707f6e361f3e 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Anna Bridge 186:707f6e361f3e 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Anna Bridge 186:707f6e361f3e 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
Anna Bridge 186:707f6e361f3e 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
Anna Bridge 186:707f6e361f3e 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
Anna Bridge 186:707f6e361f3e 26 * OTHER DEALINGS IN THE SOFTWARE.
Anna Bridge 186:707f6e361f3e 27 *
Anna Bridge 186:707f6e361f3e 28 * Except as contained in this notice, the name of Maxim Integrated
Anna Bridge 186:707f6e361f3e 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
Anna Bridge 186:707f6e361f3e 30 * Products, Inc. Branding Policy.
Anna Bridge 186:707f6e361f3e 31 *
Anna Bridge 186:707f6e361f3e 32 * The mere transfer of this software does not imply any licenses
Anna Bridge 186:707f6e361f3e 33 * of trade secrets, proprietary technology, copyrights, patents,
Anna Bridge 186:707f6e361f3e 34 * trademarks, maskwork rights, or any other form of intellectual
Anna Bridge 186:707f6e361f3e 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
Anna Bridge 186:707f6e361f3e 36 * ownership rights.
Anna Bridge 186:707f6e361f3e 37 *
Anna Bridge 186:707f6e361f3e 38 * $Date: 2017-02-14 18:08:19 -0600 (Tue, 14 Feb 2017) $
Anna Bridge 186:707f6e361f3e 39 * $Revision: 26419 $
Anna Bridge 186:707f6e361f3e 40 *
Anna Bridge 186:707f6e361f3e 41 *************************************************************************** */
Anna Bridge 186:707f6e361f3e 42
Anna Bridge 186:707f6e361f3e 43
Anna Bridge 186:707f6e361f3e 44
Anna Bridge 186:707f6e361f3e 45 /* **** Includes **** */
Anna Bridge 186:707f6e361f3e 46 #include "mxc_config.h"
Anna Bridge 186:707f6e361f3e 47 #include "mxc_assert.h"
Anna Bridge 186:707f6e361f3e 48 #include "mxc_sys.h"
Anna Bridge 186:707f6e361f3e 49 #include "adc.h"
Anna Bridge 186:707f6e361f3e 50
Anna Bridge 186:707f6e361f3e 51 /**
Anna Bridge 186:707f6e361f3e 52 * @ingroup group_adc
Anna Bridge 186:707f6e361f3e 53 * @{
Anna Bridge 186:707f6e361f3e 54 */
Anna Bridge 186:707f6e361f3e 55
Anna Bridge 186:707f6e361f3e 56 /* **** Definitions **** */
Anna Bridge 186:707f6e361f3e 57
Anna Bridge 186:707f6e361f3e 58 /* **** Globals **** */
Anna Bridge 186:707f6e361f3e 59
Anna Bridge 186:707f6e361f3e 60 /* **** Functions **** */
Anna Bridge 186:707f6e361f3e 61
Anna Bridge 186:707f6e361f3e 62 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 63 int ADC_Init(void)
Anna Bridge 186:707f6e361f3e 64 {
Anna Bridge 186:707f6e361f3e 65 int err;
Anna Bridge 186:707f6e361f3e 66
Anna Bridge 186:707f6e361f3e 67 if ((err = SYS_ADC_Init()) != E_NO_ERROR) {
Anna Bridge 186:707f6e361f3e 68 return err;
Anna Bridge 186:707f6e361f3e 69 }
Anna Bridge 186:707f6e361f3e 70
Anna Bridge 186:707f6e361f3e 71 /* Wipe previous configuration */
Anna Bridge 186:707f6e361f3e 72 MXC_ADC->intr = 0;
Anna Bridge 186:707f6e361f3e 73
Anna Bridge 186:707f6e361f3e 74 /* Clear all ADC interrupt flags (W1C) */
Anna Bridge 186:707f6e361f3e 75 MXC_ADC->intr = MXC_ADC->intr;
Anna Bridge 186:707f6e361f3e 76
Anna Bridge 186:707f6e361f3e 77 /* Enable done interrupt */
Anna Bridge 186:707f6e361f3e 78 MXC_ADC->intr = MXC_F_ADC_INTR_ADC_DONE_IE;
Anna Bridge 186:707f6e361f3e 79
Anna Bridge 186:707f6e361f3e 80 /* Power up the ADC */
Anna Bridge 186:707f6e361f3e 81 MXC_ADC->ctrl = (MXC_F_ADC_CTRL_ADC_PU |
Anna Bridge 186:707f6e361f3e 82 MXC_F_ADC_CTRL_ADC_CLK_EN |
Anna Bridge 186:707f6e361f3e 83 MXC_F_ADC_CTRL_BUF_PU |
Anna Bridge 186:707f6e361f3e 84 MXC_F_ADC_CTRL_ADC_REFBUF_PU |
Anna Bridge 186:707f6e361f3e 85 MXC_F_ADC_CTRL_ADC_CHGPUMP_PU);
Anna Bridge 186:707f6e361f3e 86
Anna Bridge 186:707f6e361f3e 87 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 88 }
Anna Bridge 186:707f6e361f3e 89
Anna Bridge 186:707f6e361f3e 90 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 91 void ADC_StartConvert(mxc_adc_chsel_t channel, unsigned int adc_scale, unsigned int bypass)
Anna Bridge 186:707f6e361f3e 92 {
Anna Bridge 186:707f6e361f3e 93 uint32_t ctrl_tmp;
Anna Bridge 186:707f6e361f3e 94
Anna Bridge 186:707f6e361f3e 95 /* Clear the ADC done flag */
Anna Bridge 186:707f6e361f3e 96 ADC_ClearFlags(MXC_F_ADC_INTR_ADC_DONE_IF);
Anna Bridge 186:707f6e361f3e 97
Anna Bridge 186:707f6e361f3e 98 /* Insert channel selection */
Anna Bridge 186:707f6e361f3e 99 ctrl_tmp = MXC_ADC->ctrl;
Anna Bridge 186:707f6e361f3e 100 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_CHSEL);
Anna Bridge 186:707f6e361f3e 101 ctrl_tmp |= ((channel << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL);
Anna Bridge 186:707f6e361f3e 102
Anna Bridge 186:707f6e361f3e 103 /* Clear channel configuration */
Anna Bridge 186:707f6e361f3e 104 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_REFSCL | MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_BUF_BYPASS);
Anna Bridge 186:707f6e361f3e 105
Anna Bridge 186:707f6e361f3e 106 /* ADC reference scaling must be set for all channels but two*/
Anna Bridge 186:707f6e361f3e 107 if ((channel != ADC_CH_VDD18) && (channel != ADC_CH_VDD12)) {
Anna Bridge 186:707f6e361f3e 108 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_REFSCL;
Anna Bridge 186:707f6e361f3e 109 }
Anna Bridge 186:707f6e361f3e 110
Anna Bridge 186:707f6e361f3e 111 /* Finalize user-requested channel configuration */
Anna Bridge 186:707f6e361f3e 112 if (adc_scale || channel > ADC_CH_3) {
Anna Bridge 186:707f6e361f3e 113 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_SCALE;
Anna Bridge 186:707f6e361f3e 114 }
Anna Bridge 186:707f6e361f3e 115 if (bypass) {
Anna Bridge 186:707f6e361f3e 116 ctrl_tmp |= MXC_F_ADC_CTRL_BUF_BYPASS;
Anna Bridge 186:707f6e361f3e 117 }
Anna Bridge 186:707f6e361f3e 118
Anna Bridge 186:707f6e361f3e 119 /* Write this configuration */
Anna Bridge 186:707f6e361f3e 120 MXC_ADC->ctrl = ctrl_tmp;
Anna Bridge 186:707f6e361f3e 121
Anna Bridge 186:707f6e361f3e 122 /* Start conversion */
Anna Bridge 186:707f6e361f3e 123 MXC_ADC->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START;
Anna Bridge 186:707f6e361f3e 124
Anna Bridge 186:707f6e361f3e 125 }
Anna Bridge 186:707f6e361f3e 126
Anna Bridge 186:707f6e361f3e 127 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 128 int ADC_GetData(uint16_t *outdata)
Anna Bridge 186:707f6e361f3e 129 {
Anna Bridge 186:707f6e361f3e 130 /* See if a conversion is in process */
Anna Bridge 186:707f6e361f3e 131 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_ACTIVE) {
Anna Bridge 186:707f6e361f3e 132 /* Wait for conversion to complete */
Anna Bridge 186:707f6e361f3e 133 while ((MXC_ADC->intr & MXC_F_ADC_INTR_ADC_DONE_IF) == 0);
Anna Bridge 186:707f6e361f3e 134 }
Anna Bridge 186:707f6e361f3e 135
Anna Bridge 186:707f6e361f3e 136 /* Read 32-bit value and truncate to 16-bit for output depending on data align bit*/
Anna Bridge 186:707f6e361f3e 137 if((MXC_ADC->ctrl & MXC_F_ADC_CTRL_ADC_DATAALIGN) == 0)
Anna Bridge 186:707f6e361f3e 138 *outdata = (uint16_t)(MXC_ADC->data); /* LSB justified */
Anna Bridge 186:707f6e361f3e 139 else
Anna Bridge 186:707f6e361f3e 140 *outdata = (uint16_t)(MXC_ADC->data >> 6); /* MSB justified */
Anna Bridge 186:707f6e361f3e 141
Anna Bridge 186:707f6e361f3e 142 /* Check for overflow */
Anna Bridge 186:707f6e361f3e 143 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) {
Anna Bridge 186:707f6e361f3e 144 return E_OVERFLOW;
Anna Bridge 186:707f6e361f3e 145 }
Anna Bridge 186:707f6e361f3e 146
Anna Bridge 186:707f6e361f3e 147 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 148 }
Anna Bridge 186:707f6e361f3e 149
Anna Bridge 186:707f6e361f3e 150 /* ************************************************************************* */
Anna Bridge 186:707f6e361f3e 151 int ADC_SetLimit(mxc_adc_limitsel_t unit, mxc_adc_chsel_t channel,
Anna Bridge 186:707f6e361f3e 152 unsigned int low_enable, unsigned int low_limit,
Anna Bridge 186:707f6e361f3e 153 unsigned int high_enable, unsigned int high_limit)
Anna Bridge 186:707f6e361f3e 154 {
Anna Bridge 186:707f6e361f3e 155 /* Check args */
Anna Bridge 186:707f6e361f3e 156 if ((unit >= ADC_LIMIT_MAX) || (channel >= ADC_CH_MAX))
Anna Bridge 186:707f6e361f3e 157 return E_BAD_PARAM;
Anna Bridge 186:707f6e361f3e 158
Anna Bridge 186:707f6e361f3e 159 /* set channel using the limit */
Anna Bridge 186:707f6e361f3e 160 MXC_ADC->limit[unit] = ((channel << MXC_F_ADC_LIMIT0_CH_SEL_POS) & MXC_F_ADC_LIMIT0_CH_SEL);
Anna Bridge 186:707f6e361f3e 161
Anna Bridge 186:707f6e361f3e 162 /* enable/disable the limit*/
Anna Bridge 186:707f6e361f3e 163 if (low_enable) {
Anna Bridge 186:707f6e361f3e 164 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN |
Anna Bridge 186:707f6e361f3e 165 ((low_limit << MXC_F_ADC_LIMIT0_CH_LO_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_LO_LIMIT);
Anna Bridge 186:707f6e361f3e 166 }
Anna Bridge 186:707f6e361f3e 167 else{
Anna Bridge 186:707f6e361f3e 168 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN;
Anna Bridge 186:707f6e361f3e 169 }
Anna Bridge 186:707f6e361f3e 170
Anna Bridge 186:707f6e361f3e 171 if (high_enable) {
Anna Bridge 186:707f6e361f3e 172 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN |
Anna Bridge 186:707f6e361f3e 173 ((high_limit << MXC_F_ADC_LIMIT0_CH_HI_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_HI_LIMIT);
Anna Bridge 186:707f6e361f3e 174 }
Anna Bridge 186:707f6e361f3e 175 else{
Anna Bridge 186:707f6e361f3e 176 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN;
Anna Bridge 186:707f6e361f3e 177 }
Anna Bridge 186:707f6e361f3e 178
Anna Bridge 186:707f6e361f3e 179 return E_NO_ERROR;
Anna Bridge 186:707f6e361f3e 180 }
Anna Bridge 186:707f6e361f3e 181
Anna Bridge 186:707f6e361f3e 182 /** @} */