Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Maxim/TARGET_MAX32630/mxc/adc.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
157:ff67d9f36b67 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 157:ff67d9f36b67 1 /**
<> 157:ff67d9f36b67 2 * @file
<> 157:ff67d9f36b67 3 * @brief This file contains the function implementations for the Analog to
<> 157:ff67d9f36b67 4 * Digital Converter (ADC) peripheral module.
<> 157:ff67d9f36b67 5 */
<> 157:ff67d9f36b67 6
<> 157:ff67d9f36b67 7 /* ****************************************************************************
<> 157:ff67d9f36b67 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
<> 157:ff67d9f36b67 9 *
<> 157:ff67d9f36b67 10 * Permission is hereby granted, free of charge, to any person obtaining a
<> 157:ff67d9f36b67 11 * copy of this software and associated documentation files (the "Software"),
<> 157:ff67d9f36b67 12 * to deal in the Software without restriction, including without limitation
<> 157:ff67d9f36b67 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 157:ff67d9f36b67 14 * and/or sell copies of the Software, and to permit persons to whom the
<> 157:ff67d9f36b67 15 * Software is furnished to do so, subject to the following conditions:
<> 157:ff67d9f36b67 16 *
<> 157:ff67d9f36b67 17 * The above copyright notice and this permission notice shall be included
<> 157:ff67d9f36b67 18 * in all copies or substantial portions of the Software.
<> 157:ff67d9f36b67 19 *
<> 157:ff67d9f36b67 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 157:ff67d9f36b67 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 157:ff67d9f36b67 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 157:ff67d9f36b67 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 157:ff67d9f36b67 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 157:ff67d9f36b67 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 157:ff67d9f36b67 26 * OTHER DEALINGS IN THE SOFTWARE.
<> 157:ff67d9f36b67 27 *
<> 157:ff67d9f36b67 28 * Except as contained in this notice, the name of Maxim Integrated
<> 157:ff67d9f36b67 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 157:ff67d9f36b67 30 * Products, Inc. Branding Policy.
<> 157:ff67d9f36b67 31 *
<> 157:ff67d9f36b67 32 * The mere transfer of this software does not imply any licenses
<> 157:ff67d9f36b67 33 * of trade secrets, proprietary technology, copyrights, patents,
<> 157:ff67d9f36b67 34 * trademarks, maskwork rights, or any other form of intellectual
<> 157:ff67d9f36b67 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 157:ff67d9f36b67 36 * ownership rights.
<> 157:ff67d9f36b67 37 *
<> 157:ff67d9f36b67 38 * $Date: 2016-09-09 12:50:50 -0500 (Fri, 09 Sep 2016) $
<> 157:ff67d9f36b67 39 * $Revision: 24349 $
<> 157:ff67d9f36b67 40 *
<> 157:ff67d9f36b67 41 *************************************************************************** */
<> 157:ff67d9f36b67 42
<> 157:ff67d9f36b67 43 /**
<> 157:ff67d9f36b67 44 * @ingroup adc
<> 157:ff67d9f36b67 45 * @{
<> 157:ff67d9f36b67 46 */
<> 157:ff67d9f36b67 47
<> 157:ff67d9f36b67 48 /* **** Includes **** */
<> 157:ff67d9f36b67 49 #include "mxc_config.h"
<> 157:ff67d9f36b67 50 #include "mxc_assert.h"
<> 157:ff67d9f36b67 51 #include "mxc_sys.h"
<> 157:ff67d9f36b67 52 #include "adc.h"
<> 157:ff67d9f36b67 53
<> 157:ff67d9f36b67 54 /* **** Definitions **** */
<> 157:ff67d9f36b67 55
<> 157:ff67d9f36b67 56 /* **** Globals **** */
<> 157:ff67d9f36b67 57
<> 157:ff67d9f36b67 58 /* **** Functions **** */
<> 157:ff67d9f36b67 59
<> 157:ff67d9f36b67 60 /* ************************************************************************* */
<> 157:ff67d9f36b67 61 int ADC_Init(void)
<> 157:ff67d9f36b67 62 {
<> 157:ff67d9f36b67 63 int err;
<> 157:ff67d9f36b67 64
<> 157:ff67d9f36b67 65 if ((err = SYS_ADC_Init()) != E_NO_ERROR) {
<> 157:ff67d9f36b67 66 return err;
<> 157:ff67d9f36b67 67 }
<> 157:ff67d9f36b67 68
<> 157:ff67d9f36b67 69 /* Wipe previous configuration */
<> 157:ff67d9f36b67 70 MXC_ADC->intr = 0;
<> 157:ff67d9f36b67 71
<> 157:ff67d9f36b67 72 /* Clear all ADC interrupt flags (W1C) */
<> 157:ff67d9f36b67 73 MXC_ADC->intr = MXC_ADC->intr;
<> 157:ff67d9f36b67 74
<> 157:ff67d9f36b67 75 /* Enable done interrupt */
<> 157:ff67d9f36b67 76 MXC_ADC->intr = MXC_F_ADC_INTR_ADC_DONE_IE;
<> 157:ff67d9f36b67 77
<> 157:ff67d9f36b67 78 /* Power up the ADC */
<> 157:ff67d9f36b67 79 MXC_ADC->ctrl = (MXC_F_ADC_CTRL_ADC_PU |
<> 157:ff67d9f36b67 80 MXC_F_ADC_CTRL_ADC_CLK_EN |
<> 157:ff67d9f36b67 81 MXC_F_ADC_CTRL_BUF_PU |
<> 157:ff67d9f36b67 82 MXC_F_ADC_CTRL_ADC_REFBUF_PU |
<> 157:ff67d9f36b67 83 MXC_F_ADC_CTRL_ADC_CHGPUMP_PU);
<> 157:ff67d9f36b67 84
<> 157:ff67d9f36b67 85 return E_NO_ERROR;
<> 157:ff67d9f36b67 86 }
<> 157:ff67d9f36b67 87
<> 157:ff67d9f36b67 88 /* ************************************************************************* */
<> 157:ff67d9f36b67 89 void ADC_StartConvert(mxc_adc_chsel_t channel, unsigned int adc_scale, unsigned int bypass)
<> 157:ff67d9f36b67 90 {
<> 157:ff67d9f36b67 91 uint32_t ctrl_tmp;
<> 157:ff67d9f36b67 92
<> 157:ff67d9f36b67 93 /* Clear the ADC done flag */
<> 157:ff67d9f36b67 94 ADC_ClearFlags(MXC_F_ADC_INTR_ADC_DONE_IF);
<> 157:ff67d9f36b67 95
<> 157:ff67d9f36b67 96 /* Insert channel selection */
<> 157:ff67d9f36b67 97 ctrl_tmp = MXC_ADC->ctrl;
<> 157:ff67d9f36b67 98 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_CHSEL);
<> 157:ff67d9f36b67 99 ctrl_tmp |= ((channel << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL);
<> 157:ff67d9f36b67 100
<> 157:ff67d9f36b67 101 /* Clear channel configuration */
<> 157:ff67d9f36b67 102 ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_REFSCL | MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_BUF_BYPASS);
<> 157:ff67d9f36b67 103
<> 157:ff67d9f36b67 104 /* ADC reference scaling must be set for all channels but two*/
<> 157:ff67d9f36b67 105 if ((channel != ADC_CH_VDD18) && (channel != ADC_CH_VDD12)) {
<> 157:ff67d9f36b67 106 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_REFSCL;
<> 157:ff67d9f36b67 107 }
<> 157:ff67d9f36b67 108
<> 157:ff67d9f36b67 109 /* Finalize user-requested channel configuration */
<> 157:ff67d9f36b67 110 if (adc_scale || channel > ADC_CH_3) {
<> 157:ff67d9f36b67 111 ctrl_tmp |= MXC_F_ADC_CTRL_ADC_SCALE;
<> 157:ff67d9f36b67 112 }
<> 157:ff67d9f36b67 113 if (bypass) {
<> 157:ff67d9f36b67 114 ctrl_tmp |= MXC_F_ADC_CTRL_BUF_BYPASS;
<> 157:ff67d9f36b67 115 }
<> 157:ff67d9f36b67 116
<> 157:ff67d9f36b67 117 /* Write this configuration */
<> 157:ff67d9f36b67 118 MXC_ADC->ctrl = ctrl_tmp;
<> 157:ff67d9f36b67 119
<> 157:ff67d9f36b67 120 /* Start conversion */
<> 157:ff67d9f36b67 121 MXC_ADC->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START;
<> 157:ff67d9f36b67 122
<> 157:ff67d9f36b67 123 }
<> 157:ff67d9f36b67 124
<> 157:ff67d9f36b67 125 /* ************************************************************************* */
<> 157:ff67d9f36b67 126 int ADC_GetData(uint16_t *outdata)
<> 157:ff67d9f36b67 127 {
<> 157:ff67d9f36b67 128 /* See if a conversion is in process */
<> 157:ff67d9f36b67 129 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_ACTIVE) {
<> 157:ff67d9f36b67 130 /* Wait for conversion to complete */
<> 157:ff67d9f36b67 131 while ((MXC_ADC->intr & MXC_F_ADC_INTR_ADC_DONE_IF) == 0);
<> 157:ff67d9f36b67 132 }
<> 157:ff67d9f36b67 133
<> 157:ff67d9f36b67 134 /* Read 32-bit value and truncate to 16-bit for output depending on data align bit*/
<> 157:ff67d9f36b67 135 if((MXC_ADC->ctrl & MXC_F_ADC_CTRL_ADC_DATAALIGN) == 0)
<> 157:ff67d9f36b67 136 *outdata = (uint16_t)(MXC_ADC->data); /* LSB justified */
<> 157:ff67d9f36b67 137 else
<> 157:ff67d9f36b67 138 *outdata = (uint16_t)(MXC_ADC->data >> 6); /* MSB justified */
<> 157:ff67d9f36b67 139
<> 157:ff67d9f36b67 140 /* Check for overflow */
<> 157:ff67d9f36b67 141 if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) {
<> 157:ff67d9f36b67 142 return E_OVERFLOW;
<> 157:ff67d9f36b67 143 }
<> 157:ff67d9f36b67 144
<> 157:ff67d9f36b67 145 return E_NO_ERROR;
<> 157:ff67d9f36b67 146 }
<> 157:ff67d9f36b67 147
<> 157:ff67d9f36b67 148 /* ************************************************************************* */
<> 157:ff67d9f36b67 149 int ADC_SetLimit(mxc_adc_limitsel_t unit, mxc_adc_chsel_t channel,
<> 157:ff67d9f36b67 150 unsigned int low_enable, unsigned int low_limit,
<> 157:ff67d9f36b67 151 unsigned int high_enable, unsigned int high_limit)
<> 157:ff67d9f36b67 152 {
<> 157:ff67d9f36b67 153 /* Check args */
<> 157:ff67d9f36b67 154 if ((unit >= ADC_LIMIT_MAX) || (channel >= ADC_CH_MAX))
<> 157:ff67d9f36b67 155 return E_BAD_PARAM;
<> 157:ff67d9f36b67 156
<> 157:ff67d9f36b67 157 /* set channel using the limit */
<> 157:ff67d9f36b67 158 MXC_ADC->limit[unit] = ((channel << MXC_F_ADC_LIMIT0_CH_SEL_POS) & MXC_F_ADC_LIMIT0_CH_SEL);
<> 157:ff67d9f36b67 159
<> 157:ff67d9f36b67 160 /* enable/disable the limit*/
<> 157:ff67d9f36b67 161 if (low_enable) {
<> 157:ff67d9f36b67 162 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN |
<> 157:ff67d9f36b67 163 ((low_limit << MXC_F_ADC_LIMIT0_CH_LO_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_LO_LIMIT);
<> 157:ff67d9f36b67 164 }
<> 157:ff67d9f36b67 165 else{
<> 157:ff67d9f36b67 166 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN;
<> 157:ff67d9f36b67 167 }
<> 157:ff67d9f36b67 168
<> 157:ff67d9f36b67 169 if (high_enable) {
<> 157:ff67d9f36b67 170 MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN |
<> 157:ff67d9f36b67 171 ((high_limit << MXC_F_ADC_LIMIT0_CH_HI_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_HI_LIMIT);
<> 157:ff67d9f36b67 172 }
<> 157:ff67d9f36b67 173 else{
<> 157:ff67d9f36b67 174 MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN;
<> 157:ff67d9f36b67 175 }
<> 157:ff67d9f36b67 176
<> 157:ff67d9f36b67 177 return E_NO_ERROR;
<> 157:ff67d9f36b67 178 }
<> 157:ff67d9f36b67 179
<> 157:ff67d9f36b67 180 /**@} end of group adc */