Amit Gandhi / mbed-dev

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Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F3/analogin_api.c@178:d650f5d4c87a, 2017-11-08 (annotated)

Committer:
AnnaBridge
Date:
Wed Nov 08 13:50:44 2017 +0000
Revision:
178:d650f5d4c87a
Parent:
173:7d866c31b3c5 
This updates the lib to the mbed lib v 155

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2016, STMicroelectronics
<> 149:156823d33999 3 * All rights reserved.
<> 149:156823d33999 4 *
<> 149:156823d33999 5 * Redistribution and use in source and binary forms, with or without
<> 149:156823d33999 6 * modification, are permitted provided that the following conditions are met:
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * 1. Redistributions of source code must retain the above copyright notice,
<> 149:156823d33999 9 * this list of conditions and the following disclaimer.
<> 149:156823d33999 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 149:156823d33999 11 * this list of conditions and the following disclaimer in the documentation
<> 149:156823d33999 12 * and/or other materials provided with the distribution.
<> 149:156823d33999 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 149:156823d33999 14 * may be used to endorse or promote products derived from this software
<> 149:156823d33999 15 * without specific prior written permission.
<> 149:156823d33999 16 *
<> 149:156823d33999 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 149:156823d33999 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 149:156823d33999 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 149:156823d33999 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 149:156823d33999 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 149:156823d33999 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 149:156823d33999 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 149:156823d33999 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 149:156823d33999 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 149:156823d33999 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 149:156823d33999 27 */
<> 149:156823d33999 28 #include "mbed_assert.h"
<> 149:156823d33999 29 #include "analogin_api.h"
<> 149:156823d33999 30
<> 149:156823d33999 31 #if DEVICE_ANALOGIN
<> 149:156823d33999 32
<> 160:d5399cc887bb 33 #include "mbed_wait_api.h"
<> 149:156823d33999 34 #include "cmsis.h"
<> 149:156823d33999 35 #include "pinmap.h"
<> 149:156823d33999 36 #include "mbed_error.h"
<> 149:156823d33999 37 #include "PeripheralPins.h"
<> 149:156823d33999 38
<> 149:156823d33999 39
<> 149:156823d33999 40 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 41 {
<> 149:156823d33999 42 #if defined(ADC1)
<> 149:156823d33999 43 static int adc1_inited = 0;
<> 149:156823d33999 44 #endif
<> 149:156823d33999 45 #if defined(ADC2)
<> 149:156823d33999 46 static int adc2_inited = 0;
<> 149:156823d33999 47 #endif
<> 149:156823d33999 48 #if defined(ADC3)
<> 149:156823d33999 49 static int adc3_inited = 0;
<> 149:156823d33999 50 #endif
<> 149:156823d33999 51 #if defined(ADC4)
<> 149:156823d33999 52 static int adc4_inited = 0;
<> 149:156823d33999 53 #endif
<> 149:156823d33999 54
AnnaBridge 173:7d866c31b3c5 55 uint32_t function = (uint32_t)NC;
AnnaBridge 173:7d866c31b3c5 56
AnnaBridge 173:7d866c31b3c5 57 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
AnnaBridge 173:7d866c31b3c5 58 // are described in PinNames.h and PeripheralPins.c
AnnaBridge 173:7d866c31b3c5 59 // Pin value must be between 0xF0 and 0xFF
AnnaBridge 173:7d866c31b3c5 60 if ((pin < 0xF0) || (pin >= 0x100)) {
AnnaBridge 173:7d866c31b3c5 61 // Normal channels
AnnaBridge 173:7d866c31b3c5 62 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 173:7d866c31b3c5 63 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC);
AnnaBridge 173:7d866c31b3c5 64 // Get the functions (adc channel) from the pin and assign it to the object
AnnaBridge 173:7d866c31b3c5 65 function = pinmap_function(pin, PinMap_ADC);
AnnaBridge 173:7d866c31b3c5 66 // Configure GPIO
AnnaBridge 173:7d866c31b3c5 67 pinmap_pinout(pin, PinMap_ADC);
AnnaBridge 173:7d866c31b3c5 68 } else {
AnnaBridge 173:7d866c31b3c5 69 // Internal channels
AnnaBridge 173:7d866c31b3c5 70 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC_Internal);
AnnaBridge 173:7d866c31b3c5 71 function = pinmap_function(pin, PinMap_ADC_Internal);
AnnaBridge 173:7d866c31b3c5 72 // No GPIO configuration for internal channels
AnnaBridge 173:7d866c31b3c5 73 }
AnnaBridge 172:89b338f31ef1 74 MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
<> 149:156823d33999 75 MBED_ASSERT(function != (uint32_t)NC);
AnnaBridge 173:7d866c31b3c5 76
<> 149:156823d33999 77 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 78
<> 149:156823d33999 79 // Save pin number for the read function
<> 149:156823d33999 80 obj->pin = pin;
<> 149:156823d33999 81
<> 149:156823d33999 82 // Check if ADC is already initialized
<> 149:156823d33999 83 // Enable ADC clock
<> 149:156823d33999 84 #if defined(ADC1)
AnnaBridge 172:89b338f31ef1 85 if (((ADCName)obj->handle.Instance == ADC_1) && adc1_inited) return;
AnnaBridge 172:89b338f31ef1 86 if ((ADCName)obj->handle.Instance == ADC_1) {
<> 149:156823d33999 87 __ADC1_CLK_ENABLE();
<> 149:156823d33999 88 adc1_inited = 1;
<> 149:156823d33999 89 }
<> 149:156823d33999 90 #endif
<> 149:156823d33999 91 #if defined(ADC2)
AnnaBridge 172:89b338f31ef1 92 if (((ADCName)obj->handle.Instance == ADC_2) && adc2_inited) return;
AnnaBridge 172:89b338f31ef1 93 if ((ADCName)obj->handle.Instance == ADC_2) {
<> 149:156823d33999 94 __ADC2_CLK_ENABLE();
<> 149:156823d33999 95 adc2_inited = 1;
<> 149:156823d33999 96 }
<> 149:156823d33999 97 #endif
<> 149:156823d33999 98 #if defined(ADC3)
AnnaBridge 172:89b338f31ef1 99 if (((ADCName)obj->handle.Instance == ADC_3) && adc3_inited) return;
AnnaBridge 172:89b338f31ef1 100 if ((ADCName)obj->handle.Instance == ADC_3) {
<> 149:156823d33999 101 __ADC34_CLK_ENABLE();
<> 149:156823d33999 102 adc3_inited = 1;
<> 149:156823d33999 103 }
<> 149:156823d33999 104 #endif
<> 149:156823d33999 105 #if defined(ADC4)
AnnaBridge 172:89b338f31ef1 106 if (((ADCName)obj->handle.Instance == ADC_4) && adc4_inited) return;
AnnaBridge 172:89b338f31ef1 107 if ((ADCName)obj->handle.Instance == ADC_4) {
<> 149:156823d33999 108 __ADC34_CLK_ENABLE();
<> 149:156823d33999 109 adc4_inited = 1;
<> 149:156823d33999 110 }
<> 149:156823d33999 111 #endif
<> 149:156823d33999 112
<> 149:156823d33999 113 // Configure ADC
AnnaBridge 172:89b338f31ef1 114 obj->handle.State = HAL_ADC_STATE_RESET;
AnnaBridge 172:89b338f31ef1 115 obj->handle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
AnnaBridge 172:89b338f31ef1 116 obj->handle.Init.Resolution = ADC_RESOLUTION12b;
AnnaBridge 172:89b338f31ef1 117 obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AnnaBridge 172:89b338f31ef1 118 obj->handle.Init.ScanConvMode = DISABLE;
AnnaBridge 172:89b338f31ef1 119 obj->handle.Init.EOCSelection = EOC_SINGLE_CONV;
AnnaBridge 172:89b338f31ef1 120 obj->handle.Init.LowPowerAutoWait = DISABLE;
AnnaBridge 172:89b338f31ef1 121 obj->handle.Init.ContinuousConvMode = DISABLE;
AnnaBridge 172:89b338f31ef1 122 obj->handle.Init.NbrOfConversion = 1;
AnnaBridge 172:89b338f31ef1 123 obj->handle.Init.DiscontinuousConvMode = DISABLE;
AnnaBridge 172:89b338f31ef1 124 obj->handle.Init.NbrOfDiscConversion = 0;
AnnaBridge 172:89b338f31ef1 125 obj->handle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
AnnaBridge 172:89b338f31ef1 126 obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AnnaBridge 172:89b338f31ef1 127 obj->handle.Init.DMAContinuousRequests = DISABLE;
AnnaBridge 172:89b338f31ef1 128 obj->handle.Init.Overrun = OVR_DATA_OVERWRITTEN;
<> 149:156823d33999 129
AnnaBridge 172:89b338f31ef1 130 if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
<> 149:156823d33999 131 error("Cannot initialize ADC");
<> 149:156823d33999 132 }
<> 149:156823d33999 133 }
<> 149:156823d33999 134
<> 149:156823d33999 135 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 136 {
<> 149:156823d33999 137 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 138
<> 149:156823d33999 139 // Configure ADC channel
<> 149:156823d33999 140 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 141 sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
<> 149:156823d33999 142 sConfig.SingleDiff = ADC_SINGLE_ENDED;
<> 149:156823d33999 143 sConfig.OffsetNumber = ADC_OFFSET_NONE;
<> 149:156823d33999 144 sConfig.Offset = 0;
<> 149:156823d33999 145
<> 149:156823d33999 146 switch (obj->channel) {
<> 149:156823d33999 147 case 1:
<> 149:156823d33999 148 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 149 break;
<> 149:156823d33999 150 case 2:
<> 149:156823d33999 151 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 152 break;
<> 149:156823d33999 153 case 3:
<> 149:156823d33999 154 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 155 break;
<> 149:156823d33999 156 case 4:
<> 149:156823d33999 157 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 158 break;
<> 149:156823d33999 159 case 5:
<> 149:156823d33999 160 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 161 break;
<> 149:156823d33999 162 case 6:
<> 149:156823d33999 163 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 164 break;
<> 149:156823d33999 165 case 7:
<> 149:156823d33999 166 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 167 break;
<> 149:156823d33999 168 case 8:
<> 149:156823d33999 169 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 170 break;
<> 149:156823d33999 171 case 9:
<> 149:156823d33999 172 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 173 break;
<> 149:156823d33999 174 case 10:
<> 149:156823d33999 175 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 176 break;
<> 149:156823d33999 177 case 11:
<> 149:156823d33999 178 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 179 break;
<> 149:156823d33999 180 case 12:
<> 149:156823d33999 181 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 182 break;
<> 149:156823d33999 183 case 13:
<> 149:156823d33999 184 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 185 break;
<> 149:156823d33999 186 case 14:
<> 149:156823d33999 187 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 188 break;
<> 149:156823d33999 189 case 15:
<> 149:156823d33999 190 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 191 break;
<> 149:156823d33999 192 case 16:
<> 149:156823d33999 193 sConfig.Channel = ADC_CHANNEL_16;
<> 149:156823d33999 194 break;
<> 149:156823d33999 195 case 17:
<> 149:156823d33999 196 sConfig.Channel = ADC_CHANNEL_17;
<> 149:156823d33999 197 break;
<> 149:156823d33999 198 case 18:
<> 149:156823d33999 199 sConfig.Channel = ADC_CHANNEL_18;
<> 149:156823d33999 200 break;
<> 149:156823d33999 201 default:
<> 149:156823d33999 202 return 0;
<> 149:156823d33999 203 }
<> 149:156823d33999 204
AnnaBridge 172:89b338f31ef1 205 HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
<> 149:156823d33999 206
AnnaBridge 172:89b338f31ef1 207 HAL_ADC_Start(&obj->handle); // Start conversion
<> 149:156823d33999 208
<> 149:156823d33999 209 // Wait end of conversion and get value
AnnaBridge 172:89b338f31ef1 210 if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
AnnaBridge 172:89b338f31ef1 211 return (HAL_ADC_GetValue(&obj->handle));
<> 149:156823d33999 212 } else {
<> 149:156823d33999 213 return 0;
<> 149:156823d33999 214 }
<> 149:156823d33999 215 }
<> 149:156823d33999 216
<> 149:156823d33999 217 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 218 {
<> 149:156823d33999 219 uint16_t value = adc_read(obj);
<> 149:156823d33999 220 // 12-bit to 16-bit conversion
<> 149:156823d33999 221 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 222 return value;
<> 149:156823d33999 223 }
<> 149:156823d33999 224
<> 149:156823d33999 225 float analogin_read(analogin_t *obj)
<> 149:156823d33999 226 {
<> 149:156823d33999 227 uint16_t value = adc_read(obj);
<> 149:156823d33999 228 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 229 }
<> 149:156823d33999 230
<> 149:156823d33999 231 #endif