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targets/hal/TARGET_STM/TARGET_STM32F3XX/analogin_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
155:8435094ec241 
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 155:8435094ec241 1 /* mbed Microcontroller Library
mbed_official 155:8435094ec241 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 155:8435094ec241 3 * All rights reserved.
mbed_official 155:8435094ec241 4 *
mbed_official 155:8435094ec241 5 * Redistribution and use in source and binary forms, with or without
mbed_official 155:8435094ec241 6 * modification, are permitted provided that the following conditions are met:
mbed_official 155:8435094ec241 7 *
mbed_official 155:8435094ec241 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 155:8435094ec241 9 * this list of conditions and the following disclaimer.
mbed_official 155:8435094ec241 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 155:8435094ec241 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 155:8435094ec241 12 * and/or other materials provided with the distribution.
mbed_official 155:8435094ec241 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 155:8435094ec241 14 * may be used to endorse or promote products derived from this software
mbed_official 155:8435094ec241 15 * without specific prior written permission.
mbed_official 155:8435094ec241 16 *
mbed_official 155:8435094ec241 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 155:8435094ec241 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 155:8435094ec241 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 155:8435094ec241 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 155:8435094ec241 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 155:8435094ec241 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 155:8435094ec241 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 155:8435094ec241 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 155:8435094ec241 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 155:8435094ec241 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 155:8435094ec241 27 */
mbed_official 227:7bd0639b8911 28 #include "mbed_assert.h"
mbed_official 155:8435094ec241 29 #include "analogin_api.h"
mbed_official 155:8435094ec241 30 #include "wait_api.h"
mbed_official 155:8435094ec241 31
mbed_official 155:8435094ec241 32 #if DEVICE_ANALOGIN
mbed_official 155:8435094ec241 33
mbed_official 155:8435094ec241 34 #include "cmsis.h"
mbed_official 155:8435094ec241 35 #include "pinmap.h"
mbed_official 155:8435094ec241 36
mbed_official 155:8435094ec241 37 static const PinMap PinMap_ADC[] = {
mbed_official 155:8435094ec241 38 {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN1
mbed_official 155:8435094ec241 39 {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN2
mbed_official 155:8435094ec241 40 {PA_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN3
mbed_official 155:8435094ec241 41 {PA_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4
mbed_official 155:8435094ec241 42 {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN5
mbed_official 155:8435094ec241 43 {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN6
mbed_official 155:8435094ec241 44 {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN7
mbed_official 155:8435094ec241 45 {PC_2, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8
mbed_official 155:8435094ec241 46 {PC_3, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN9
mbed_official 155:8435094ec241 47 {PA_6, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10
mbed_official 155:8435094ec241 48 {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11
mbed_official 155:8435094ec241 49 {PB_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN12
mbed_official 155:8435094ec241 50 {PB_13, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN13
mbed_official 155:8435094ec241 51 {PB_11, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN14
mbed_official 155:8435094ec241 52 {PA_7, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN15
mbed_official 155:8435094ec241 53 {NC, NC, 0}
mbed_official 155:8435094ec241 54 };
mbed_official 155:8435094ec241 55
mbed_official 155:8435094ec241 56 int adc_inited = 0;
mbed_official 155:8435094ec241 57
mbed_official 155:8435094ec241 58 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 155:8435094ec241 59
mbed_official 155:8435094ec241 60 ADC_TypeDef *adc;
mbed_official 155:8435094ec241 61 ADC_InitTypeDef ADC_InitStructure;
mbed_official 155:8435094ec241 62 ADC_CommonInitTypeDef ADC_CommonInitStructure;
mbed_official 155:8435094ec241 63
mbed_official 155:8435094ec241 64 // Get the peripheral name from the pin and assign it to the object
mbed_official 155:8435094ec241 65 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 66 MBED_ASSERT(obj->adc == (ADCName)NC);
mbed_official 155:8435094ec241 67
mbed_official 155:8435094ec241 68 // Configure GPIO
mbed_official 155:8435094ec241 69 pinmap_pinout(pin, PinMap_ADC);
mbed_official 155:8435094ec241 70
mbed_official 155:8435094ec241 71 // Save pin number for the read function
mbed_official 155:8435094ec241 72 obj->pin = pin;
mbed_official 155:8435094ec241 73
mbed_official 155:8435094ec241 74 // The ADC initialization is done once
mbed_official 155:8435094ec241 75 if (adc_inited == 0) {
mbed_official 155:8435094ec241 76 adc_inited = 1;
mbed_official 155:8435094ec241 77
mbed_official 155:8435094ec241 78 // Get ADC registers structure address
mbed_official 155:8435094ec241 79 adc = (ADC_TypeDef *)(obj->adc);
mbed_official 155:8435094ec241 80
mbed_official 155:8435094ec241 81 // Enable ADC clock
mbed_official 155:8435094ec241 82 RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div1);
mbed_official 155:8435094ec241 83 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);
mbed_official 155:8435094ec241 84
mbed_official 155:8435094ec241 85 // Calibration
mbed_official 155:8435094ec241 86 ADC_VoltageRegulatorCmd(adc, ENABLE);
mbed_official 155:8435094ec241 87 wait_us(10);
mbed_official 155:8435094ec241 88 ADC_SelectCalibrationMode(adc, ADC_CalibrationMode_Single);
mbed_official 155:8435094ec241 89 ADC_StartCalibration(adc);
mbed_official 155:8435094ec241 90 while (ADC_GetCalibrationStatus(adc) != RESET) {}
mbed_official 155:8435094ec241 91
mbed_official 155:8435094ec241 92 // Configure ADC
mbed_official 155:8435094ec241 93 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
mbed_official 155:8435094ec241 94 ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;
mbed_official 155:8435094ec241 95 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
mbed_official 155:8435094ec241 96 ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;
mbed_official 155:8435094ec241 97 ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;
mbed_official 155:8435094ec241 98 ADC_CommonInit(adc, &ADC_CommonInitStructure);
mbed_official 155:8435094ec241 99
mbed_official 155:8435094ec241 100 ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;
mbed_official 155:8435094ec241 101 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
mbed_official 155:8435094ec241 102 ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;
mbed_official 155:8435094ec241 103 ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;
mbed_official 155:8435094ec241 104 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
mbed_official 155:8435094ec241 105 ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;
mbed_official 155:8435094ec241 106 ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;
mbed_official 155:8435094ec241 107 ADC_InitStructure.ADC_NbrOfRegChannel = 1;
mbed_official 155:8435094ec241 108 ADC_Init(adc, &ADC_InitStructure);
mbed_official 155:8435094ec241 109
mbed_official 155:8435094ec241 110 // Enable ADC
mbed_official 155:8435094ec241 111 ADC_Cmd(adc, ENABLE);
mbed_official 155:8435094ec241 112
mbed_official 155:8435094ec241 113 while (!ADC_GetFlagStatus(adc, ADC_FLAG_RDY)) {}
mbed_official 155:8435094ec241 114 }
mbed_official 155:8435094ec241 115 }
mbed_official 155:8435094ec241 116
mbed_official 155:8435094ec241 117 static inline uint16_t adc_read(analogin_t *obj) {
mbed_official 155:8435094ec241 118 // Get ADC registers structure address
mbed_official 155:8435094ec241 119 ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
mbed_official 155:8435094ec241 120 uint8_t channel = 0;
mbed_official 155:8435094ec241 121
mbed_official 155:8435094ec241 122 // Configure ADC channel
mbed_official 155:8435094ec241 123 switch (obj->pin) {
mbed_official 155:8435094ec241 124 case PA_0:
mbed_official 155:8435094ec241 125 channel = ADC_Channel_1;
mbed_official 155:8435094ec241 126 break;
mbed_official 155:8435094ec241 127 case PA_1:
mbed_official 155:8435094ec241 128 channel = ADC_Channel_2;
mbed_official 155:8435094ec241 129 break;
mbed_official 155:8435094ec241 130 case PA_2:
mbed_official 155:8435094ec241 131 channel = ADC_Channel_3;
mbed_official 155:8435094ec241 132 break;
mbed_official 155:8435094ec241 133 case PA_3:
mbed_official 155:8435094ec241 134 channel = ADC_Channel_4;
mbed_official 155:8435094ec241 135 break;
mbed_official 155:8435094ec241 136 case PA_4:
mbed_official 155:8435094ec241 137 channel = ADC_Channel_5;
mbed_official 155:8435094ec241 138 break;
mbed_official 155:8435094ec241 139 case PC_0:
mbed_official 155:8435094ec241 140 channel = ADC_Channel_6;
mbed_official 155:8435094ec241 141 break;
mbed_official 155:8435094ec241 142 case PC_1:
mbed_official 155:8435094ec241 143 channel = ADC_Channel_7;
mbed_official 155:8435094ec241 144 break;
mbed_official 155:8435094ec241 145 case PC_2:
mbed_official 155:8435094ec241 146 channel = ADC_Channel_8;
mbed_official 155:8435094ec241 147 break;
mbed_official 155:8435094ec241 148 case PC_3:
mbed_official 155:8435094ec241 149 channel = ADC_Channel_9;
mbed_official 155:8435094ec241 150 break;
mbed_official 155:8435094ec241 151 case PA_6:
mbed_official 155:8435094ec241 152 channel = ADC_Channel_10;
mbed_official 155:8435094ec241 153 break;
mbed_official 155:8435094ec241 154 case PB_0:
mbed_official 155:8435094ec241 155 channel = ADC_Channel_11;
mbed_official 155:8435094ec241 156 break;
mbed_official 155:8435094ec241 157 case PB_1:
mbed_official 155:8435094ec241 158 channel = ADC_Channel_12;
mbed_official 155:8435094ec241 159 break;
mbed_official 155:8435094ec241 160 case PB_13:
mbed_official 155:8435094ec241 161 channel = ADC_Channel_13;
mbed_official 155:8435094ec241 162 break;
mbed_official 155:8435094ec241 163 case PB_11:
mbed_official 155:8435094ec241 164 channel = ADC_Channel_14;
mbed_official 155:8435094ec241 165 break;
mbed_official 155:8435094ec241 166 case PA_7:
mbed_official 155:8435094ec241 167 channel = ADC_Channel_15;
mbed_official 155:8435094ec241 168 break;
mbed_official 155:8435094ec241 169 default:
mbed_official 155:8435094ec241 170 return 0;
mbed_official 155:8435094ec241 171 }
mbed_official 155:8435094ec241 172
mbed_official 155:8435094ec241 173 ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_7Cycles5);
mbed_official 155:8435094ec241 174
mbed_official 155:8435094ec241 175 ADC_StartConversion(adc); // Start conversion
mbed_official 155:8435094ec241 176
mbed_official 155:8435094ec241 177 while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
mbed_official 155:8435094ec241 178
mbed_official 155:8435094ec241 179 return (ADC_GetConversionValue(adc)); // Get conversion value
mbed_official 155:8435094ec241 180 }
mbed_official 155:8435094ec241 181
mbed_official 155:8435094ec241 182 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 155:8435094ec241 183 return (adc_read(obj));
mbed_official 155:8435094ec241 184 }
mbed_official 155:8435094ec241 185
mbed_official 155:8435094ec241 186 float analogin_read(analogin_t *obj) {
mbed_official 155:8435094ec241 187 uint16_t value = adc_read(obj);
mbed_official 155:8435094ec241 188 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 155:8435094ec241 189 }
mbed_official 155:8435094ec241 190
mbed_official 155:8435094ec241 191 #endif