Ermanno Brusadin / mbed-src

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targets/hal/TARGET_STM/TARGET_STM32F3XX/analogin_api.c@0:0a673c671a56, 2016-07-27 (annotated)

Committer:
ebrus
Date:
Wed Jul 27 18:35:32 2016 +0000
Revision:
0:0a673c671a56
4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ebrus 0:0a673c671a56 1 /* mbed Microcontroller Library
ebrus 0:0a673c671a56 2 * Copyright (c) 2014, STMicroelectronics
ebrus 0:0a673c671a56 3 * All rights reserved.
ebrus 0:0a673c671a56 4 *
ebrus 0:0a673c671a56 5 * Redistribution and use in source and binary forms, with or without
ebrus 0:0a673c671a56 6 * modification, are permitted provided that the following conditions are met:
ebrus 0:0a673c671a56 7 *
ebrus 0:0a673c671a56 8 * 1. Redistributions of source code must retain the above copyright notice,
ebrus 0:0a673c671a56 9 * this list of conditions and the following disclaimer.
ebrus 0:0a673c671a56 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
ebrus 0:0a673c671a56 11 * this list of conditions and the following disclaimer in the documentation
ebrus 0:0a673c671a56 12 * and/or other materials provided with the distribution.
ebrus 0:0a673c671a56 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
ebrus 0:0a673c671a56 14 * may be used to endorse or promote products derived from this software
ebrus 0:0a673c671a56 15 * without specific prior written permission.
ebrus 0:0a673c671a56 16 *
ebrus 0:0a673c671a56 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
ebrus 0:0a673c671a56 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ebrus 0:0a673c671a56 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
ebrus 0:0a673c671a56 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
ebrus 0:0a673c671a56 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ebrus 0:0a673c671a56 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
ebrus 0:0a673c671a56 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
ebrus 0:0a673c671a56 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
ebrus 0:0a673c671a56 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
ebrus 0:0a673c671a56 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ebrus 0:0a673c671a56 27 */
ebrus 0:0a673c671a56 28 #include "mbed_assert.h"
ebrus 0:0a673c671a56 29 #include "analogin_api.h"
ebrus 0:0a673c671a56 30 #include "wait_api.h"
ebrus 0:0a673c671a56 31
ebrus 0:0a673c671a56 32 #if DEVICE_ANALOGIN
ebrus 0:0a673c671a56 33
ebrus 0:0a673c671a56 34 #include "cmsis.h"
ebrus 0:0a673c671a56 35 #include "pinmap.h"
ebrus 0:0a673c671a56 36
ebrus 0:0a673c671a56 37 static const PinMap PinMap_ADC[] = {
ebrus 0:0a673c671a56 38 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN1
ebrus 0:0a673c671a56 39 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN2
ebrus 0:0a673c671a56 40 {PA_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN3
ebrus 0:0a673c671a56 41 {PA_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4
ebrus 0:0a673c671a56 42 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN5
ebrus 0:0a673c671a56 43 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN6
ebrus 0:0a673c671a56 44 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN7
ebrus 0:0a673c671a56 45 {PC_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8
ebrus 0:0a673c671a56 46 {PC_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN9
ebrus 0:0a673c671a56 47 {PA_6, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10
ebrus 0:0a673c671a56 48 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11
ebrus 0:0a673c671a56 49 {PB_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN12
ebrus 0:0a673c671a56 50 {PB_13, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN13
ebrus 0:0a673c671a56 51 {PB_11, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN14
ebrus 0:0a673c671a56 52 {PA_7, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN15
ebrus 0:0a673c671a56 53 {NC, NC, 0}
ebrus 0:0a673c671a56 54 };
ebrus 0:0a673c671a56 55
ebrus 0:0a673c671a56 56 int adc_inited = 0;
ebrus 0:0a673c671a56 57
ebrus 0:0a673c671a56 58 void analogin_init(analogin_t *obj, PinName pin) {
ebrus 0:0a673c671a56 59
ebrus 0:0a673c671a56 60 ADC_TypeDef *adc;
ebrus 0:0a673c671a56 61 ADC_InitTypeDef ADC_InitStructure;
ebrus 0:0a673c671a56 62 ADC_CommonInitTypeDef ADC_CommonInitStructure;
ebrus 0:0a673c671a56 63
ebrus 0:0a673c671a56 64 // Get the peripheral name from the pin and assign it to the object
ebrus 0:0a673c671a56 65 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
ebrus 0:0a673c671a56 66 MBED_ASSERT(obj->adc == (ADCName)NC);
ebrus 0:0a673c671a56 67
ebrus 0:0a673c671a56 68 // Configure GPIO
ebrus 0:0a673c671a56 69 pinmap_pinout(pin, PinMap_ADC);
ebrus 0:0a673c671a56 70
ebrus 0:0a673c671a56 71 // Save pin number for the read function
ebrus 0:0a673c671a56 72 obj->pin = pin;
ebrus 0:0a673c671a56 73
ebrus 0:0a673c671a56 74 // The ADC initialization is done once
ebrus 0:0a673c671a56 75 if (adc_inited == 0) {
ebrus 0:0a673c671a56 76 adc_inited = 1;
ebrus 0:0a673c671a56 77
ebrus 0:0a673c671a56 78 // Get ADC registers structure address
ebrus 0:0a673c671a56 79 adc = (ADC_TypeDef *)(obj->adc);
ebrus 0:0a673c671a56 80
ebrus 0:0a673c671a56 81 // Enable ADC clock
ebrus 0:0a673c671a56 82 RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div1);
ebrus 0:0a673c671a56 83 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);
ebrus 0:0a673c671a56 84
ebrus 0:0a673c671a56 85 // Calibration
ebrus 0:0a673c671a56 86 ADC_VoltageRegulatorCmd(adc, ENABLE);
ebrus 0:0a673c671a56 87 wait_us(10);
ebrus 0:0a673c671a56 88 ADC_SelectCalibrationMode(adc, ADC_CalibrationMode_Single);
ebrus 0:0a673c671a56 89 ADC_StartCalibration(adc);
ebrus 0:0a673c671a56 90 while (ADC_GetCalibrationStatus(adc) != RESET) {}
ebrus 0:0a673c671a56 91
ebrus 0:0a673c671a56 92 // Configure ADC
ebrus 0:0a673c671a56 93 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ebrus 0:0a673c671a56 94 ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;
ebrus 0:0a673c671a56 95 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ebrus 0:0a673c671a56 96 ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;
ebrus 0:0a673c671a56 97 ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;
ebrus 0:0a673c671a56 98 ADC_CommonInit(adc, &ADC_CommonInitStructure);
ebrus 0:0a673c671a56 99
ebrus 0:0a673c671a56 100 ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;
ebrus 0:0a673c671a56 101 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ebrus 0:0a673c671a56 102 ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;
ebrus 0:0a673c671a56 103 ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;
ebrus 0:0a673c671a56 104 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ebrus 0:0a673c671a56 105 ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;
ebrus 0:0a673c671a56 106 ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;
ebrus 0:0a673c671a56 107 ADC_InitStructure.ADC_NbrOfRegChannel = 1;
ebrus 0:0a673c671a56 108 ADC_Init(adc, &ADC_InitStructure);
ebrus 0:0a673c671a56 109
ebrus 0:0a673c671a56 110 // Enable ADC
ebrus 0:0a673c671a56 111 ADC_Cmd(adc, ENABLE);
ebrus 0:0a673c671a56 112
ebrus 0:0a673c671a56 113 while (!ADC_GetFlagStatus(adc, ADC_FLAG_RDY)) {}
ebrus 0:0a673c671a56 114 }
ebrus 0:0a673c671a56 115 }
ebrus 0:0a673c671a56 116
ebrus 0:0a673c671a56 117 static inline uint16_t adc_read(analogin_t *obj) {
ebrus 0:0a673c671a56 118 // Get ADC registers structure address
ebrus 0:0a673c671a56 119 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
ebrus 0:0a673c671a56 120 uint8_t channel = 0;
ebrus 0:0a673c671a56 121
ebrus 0:0a673c671a56 122 // Configure ADC channel
ebrus 0:0a673c671a56 123 switch (obj->pin) {
ebrus 0:0a673c671a56 124 case PA_0:
ebrus 0:0a673c671a56 125 channel = ADC_Channel_1;
ebrus 0:0a673c671a56 126 break;
ebrus 0:0a673c671a56 127 case PA_1:
ebrus 0:0a673c671a56 128 channel = ADC_Channel_2;
ebrus 0:0a673c671a56 129 break;
ebrus 0:0a673c671a56 130 case PA_2:
ebrus 0:0a673c671a56 131 channel = ADC_Channel_3;
ebrus 0:0a673c671a56 132 break;
ebrus 0:0a673c671a56 133 case PA_3:
ebrus 0:0a673c671a56 134 channel = ADC_Channel_4;
ebrus 0:0a673c671a56 135 break;
ebrus 0:0a673c671a56 136 case PA_4:
ebrus 0:0a673c671a56 137 channel = ADC_Channel_5;
ebrus 0:0a673c671a56 138 break;
ebrus 0:0a673c671a56 139 case PC_0:
ebrus 0:0a673c671a56 140 channel = ADC_Channel_6;
ebrus 0:0a673c671a56 141 break;
ebrus 0:0a673c671a56 142 case PC_1:
ebrus 0:0a673c671a56 143 channel = ADC_Channel_7;
ebrus 0:0a673c671a56 144 break;
ebrus 0:0a673c671a56 145 case PC_2:
ebrus 0:0a673c671a56 146 channel = ADC_Channel_8;
ebrus 0:0a673c671a56 147 break;
ebrus 0:0a673c671a56 148 case PC_3:
ebrus 0:0a673c671a56 149 channel = ADC_Channel_9;
ebrus 0:0a673c671a56 150 break;
ebrus 0:0a673c671a56 151 case PA_6:
ebrus 0:0a673c671a56 152 channel = ADC_Channel_10;
ebrus 0:0a673c671a56 153 break;
ebrus 0:0a673c671a56 154 case PB_0:
ebrus 0:0a673c671a56 155 channel = ADC_Channel_11;
ebrus 0:0a673c671a56 156 break;
ebrus 0:0a673c671a56 157 case PB_1:
ebrus 0:0a673c671a56 158 channel = ADC_Channel_12;
ebrus 0:0a673c671a56 159 break;
ebrus 0:0a673c671a56 160 case PB_13:
ebrus 0:0a673c671a56 161 channel = ADC_Channel_13;
ebrus 0:0a673c671a56 162 break;
ebrus 0:0a673c671a56 163 case PB_11:
ebrus 0:0a673c671a56 164 channel = ADC_Channel_14;
ebrus 0:0a673c671a56 165 break;
ebrus 0:0a673c671a56 166 case PA_7:
ebrus 0:0a673c671a56 167 channel = ADC_Channel_15;
ebrus 0:0a673c671a56 168 break;
ebrus 0:0a673c671a56 169 default:
ebrus 0:0a673c671a56 170 return 0;
ebrus 0:0a673c671a56 171 }
ebrus 0:0a673c671a56 172
ebrus 0:0a673c671a56 173 ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_7Cycles5);
ebrus 0:0a673c671a56 174
ebrus 0:0a673c671a56 175 ADC_StartConversion(adc); // Start conversion
ebrus 0:0a673c671a56 176
ebrus 0:0a673c671a56 177 while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
ebrus 0:0a673c671a56 178
ebrus 0:0a673c671a56 179 return (ADC_GetConversionValue(adc)); // Get conversion value
ebrus 0:0a673c671a56 180 }
ebrus 0:0a673c671a56 181
ebrus 0:0a673c671a56 182 uint16_t analogin_read_u16(analogin_t *obj) {
ebrus 0:0a673c671a56 183 return (adc_read(obj));
ebrus 0:0a673c671a56 184 }
ebrus 0:0a673c671a56 185
ebrus 0:0a673c671a56 186 float analogin_read(analogin_t *obj) {
ebrus 0:0a673c671a56 187 uint16_t value = adc_read(obj);
ebrus 0:0a673c671a56 188 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
ebrus 0:0a673c671a56 189 }
ebrus 0:0a673c671a56 190
ebrus 0:0a673c671a56 191 #endif