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targets/TARGET_STM/TARGET_STM32L1/analogin_api.c@171:89b338f31ef1, 2017-08-16 (annotated)

Committer:
AnnaBridge
Date:
Wed Aug 16 18:27:13 2017 +0100
Revision:
171:89b338f31ef1
Parent:
160:d5399cc887bb
Child:
172:7d866c31b3c5
This updates the lib to the mbed lib v 149

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 int adc_inited = 0;
<> 149:156823d33999 40
<> 149:156823d33999 41 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 42 {
<> 149:156823d33999 43 RCC_OscInitTypeDef RCC_OscInitStruct;
<> 149:156823d33999 44
<> 149:156823d33999 45 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 171:89b338f31ef1 46 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC);
AnnaBridge 171:89b338f31ef1 47 MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
<> 149:156823d33999 48
<> 149:156823d33999 49 // Get the pin function and assign the used channel to the object
<> 149:156823d33999 50 uint32_t function = pinmap_function(pin, PinMap_ADC);
<> 149:156823d33999 51 MBED_ASSERT(function != (uint32_t)NC);
<> 149:156823d33999 52 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 53
<> 150:02e0a0aed4ec 54 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
<> 150:02e0a0aed4ec 55 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
<> 150:02e0a0aed4ec 56 if (pin < 0xF0) {
<> 149:156823d33999 57 pinmap_pinout(pin, PinMap_ADC);
<> 149:156823d33999 58 }
<> 149:156823d33999 59
<> 149:156823d33999 60 // Save pin number for the read function
<> 149:156823d33999 61 obj->pin = pin;
<> 149:156823d33999 62
<> 149:156823d33999 63 // The ADC initialization is done once
<> 149:156823d33999 64 if (adc_inited == 0) {
<> 149:156823d33999 65 adc_inited = 1;
<> 149:156823d33999 66
<> 149:156823d33999 67 // Enable the HSI (to clock the ADC)
<> 149:156823d33999 68 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
<> 149:156823d33999 69 RCC_OscInitStruct.HSIState = RCC_HSI_ON;
<> 149:156823d33999 70 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
<> 153:fa9ff456f731 71 RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
<> 149:156823d33999 72 HAL_RCC_OscConfig(&RCC_OscInitStruct);
<> 149:156823d33999 73
AnnaBridge 171:89b338f31ef1 74 obj->handle.State = HAL_ADC_STATE_RESET;
<> 149:156823d33999 75 // Enable ADC clock
<> 149:156823d33999 76 __ADC1_CLK_ENABLE();
<> 149:156823d33999 77
<> 149:156823d33999 78 // Configure ADC
AnnaBridge 171:89b338f31ef1 79 obj->handle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
AnnaBridge 171:89b338f31ef1 80 obj->handle.Init.Resolution = ADC_RESOLUTION12b;
AnnaBridge 171:89b338f31ef1 81 obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AnnaBridge 171:89b338f31ef1 82 obj->handle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
AnnaBridge 171:89b338f31ef1 83 obj->handle.Init.EOCSelection = EOC_SINGLE_CONV; // On STM32L1xx ADC, overrun detection is enabled only if EOC selection is set to each conversion (or transfer by DMA enabled, this is not the case in this example).
AnnaBridge 171:89b338f31ef1 84 obj->handle.Init.LowPowerAutoWait = ADC_AUTOWAIT_UNTIL_DATA_READ; // Enable the dynamic low power Auto Delay: new conversion start only when the previous conversion (for regular group) or previous sequence (for injected group) has been treated by user software.
AnnaBridge 171:89b338f31ef1 85 obj->handle.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_IDLE_PHASE; // Enable the auto-off mode: the ADC automatically powers-off after a conversion and automatically wakes-up when a new conversion is triggered (with startup time between trigger and start of sampling).
AnnaBridge 171:89b338f31ef1 86 obj->handle.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
AnnaBridge 171:89b338f31ef1 87 obj->handle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
AnnaBridge 171:89b338f31ef1 88 obj->handle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
AnnaBridge 171:89b338f31ef1 89 obj->handle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
AnnaBridge 171:89b338f31ef1 90 obj->handle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
AnnaBridge 171:89b338f31ef1 91 obj->handle.Init.ExternalTrigConv = 0; // Not used
AnnaBridge 171:89b338f31ef1 92 obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AnnaBridge 171:89b338f31ef1 93 obj->handle.Init.DMAContinuousRequests = DISABLE;
<> 149:156823d33999 94
AnnaBridge 171:89b338f31ef1 95 if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
<> 149:156823d33999 96 error("Cannot initialize ADC");
<> 149:156823d33999 97 }
<> 149:156823d33999 98 }
<> 149:156823d33999 99 }
<> 149:156823d33999 100
<> 149:156823d33999 101 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 102 {
<> 149:156823d33999 103 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 104
<> 149:156823d33999 105 // Configure ADC channel
<> 149:156823d33999 106 switch (obj->channel) {
<> 149:156823d33999 107 case 0:
<> 149:156823d33999 108 sConfig.Channel = ADC_CHANNEL_0;
<> 149:156823d33999 109 break;
<> 149:156823d33999 110 case 1:
<> 149:156823d33999 111 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 112 break;
<> 149:156823d33999 113 case 2:
<> 149:156823d33999 114 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 115 break;
<> 149:156823d33999 116 case 3:
<> 149:156823d33999 117 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 118 break;
<> 149:156823d33999 119 case 4:
<> 149:156823d33999 120 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 121 break;
<> 149:156823d33999 122 case 5:
<> 149:156823d33999 123 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 124 break;
<> 149:156823d33999 125 case 6:
<> 149:156823d33999 126 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 127 break;
<> 149:156823d33999 128 case 7:
<> 149:156823d33999 129 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 130 break;
<> 149:156823d33999 131 case 8:
<> 149:156823d33999 132 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 133 break;
<> 149:156823d33999 134 case 9:
<> 149:156823d33999 135 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 136 break;
<> 149:156823d33999 137 case 10:
<> 149:156823d33999 138 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 139 break;
<> 149:156823d33999 140 case 11:
<> 149:156823d33999 141 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 142 break;
<> 149:156823d33999 143 case 12:
<> 149:156823d33999 144 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 145 break;
<> 149:156823d33999 146 case 13:
<> 149:156823d33999 147 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 148 break;
<> 149:156823d33999 149 case 14:
<> 149:156823d33999 150 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 151 break;
<> 149:156823d33999 152 case 15:
<> 149:156823d33999 153 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 154 break;
<> 149:156823d33999 155 case 16:
<> 149:156823d33999 156 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 157 break;
<> 149:156823d33999 158 case 17:
<> 149:156823d33999 159 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 160 break;
<> 149:156823d33999 161 case 18:
<> 149:156823d33999 162 sConfig.Channel = ADC_CHANNEL_18;
<> 149:156823d33999 163 break;
<> 149:156823d33999 164 case 19:
<> 149:156823d33999 165 sConfig.Channel = ADC_CHANNEL_19;
<> 149:156823d33999 166 break;
<> 149:156823d33999 167 case 20:
<> 149:156823d33999 168 sConfig.Channel = ADC_CHANNEL_20;
<> 149:156823d33999 169 break;
<> 149:156823d33999 170 case 21:
<> 149:156823d33999 171 sConfig.Channel = ADC_CHANNEL_21;
<> 149:156823d33999 172 break;
<> 149:156823d33999 173 case 22:
<> 149:156823d33999 174 sConfig.Channel = ADC_CHANNEL_22;
<> 149:156823d33999 175 break;
<> 149:156823d33999 176 case 23:
<> 149:156823d33999 177 sConfig.Channel = ADC_CHANNEL_23;
<> 149:156823d33999 178 break;
<> 149:156823d33999 179 case 24:
<> 149:156823d33999 180 sConfig.Channel = ADC_CHANNEL_24;
<> 149:156823d33999 181 break;
<> 149:156823d33999 182 case 25:
<> 149:156823d33999 183 sConfig.Channel = ADC_CHANNEL_25;
<> 149:156823d33999 184 break;
<> 149:156823d33999 185 case 26:
<> 149:156823d33999 186 sConfig.Channel = ADC_CHANNEL_26;
<> 149:156823d33999 187 break;
<> 149:156823d33999 188 #ifdef ADC_CHANNEL_27
<> 149:156823d33999 189 case 27:
<> 149:156823d33999 190 sConfig.Channel = ADC_CHANNEL_27;
<> 149:156823d33999 191 break;
<> 149:156823d33999 192 #endif
<> 149:156823d33999 193 #ifdef ADC_CHANNEL_28
<> 149:156823d33999 194 case 28:
<> 149:156823d33999 195 sConfig.Channel = ADC_CHANNEL_28;
<> 149:156823d33999 196 break;
<> 149:156823d33999 197 #endif
<> 149:156823d33999 198 #ifdef ADC_CHANNEL_29
<> 149:156823d33999 199 case 29:
<> 149:156823d33999 200 sConfig.Channel = ADC_CHANNEL_29;
<> 149:156823d33999 201 break;
<> 149:156823d33999 202 #endif
<> 149:156823d33999 203 #ifdef ADC_CHANNEL_30
<> 149:156823d33999 204 case 30:
<> 149:156823d33999 205 sConfig.Channel = ADC_CHANNEL_30;
<> 149:156823d33999 206 break;
<> 149:156823d33999 207 #endif
<> 149:156823d33999 208 #ifdef ADC_CHANNEL_31
<> 149:156823d33999 209 case 31:
<> 149:156823d33999 210 sConfig.Channel = ADC_CHANNEL_31;
<> 149:156823d33999 211 break;
<> 149:156823d33999 212 #endif
<> 149:156823d33999 213 default:
<> 149:156823d33999 214 return 0;
<> 149:156823d33999 215 }
<> 149:156823d33999 216
<> 149:156823d33999 217 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 218 sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES;
<> 149:156823d33999 219
AnnaBridge 171:89b338f31ef1 220 HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
<> 149:156823d33999 221
AnnaBridge 171:89b338f31ef1 222 HAL_ADC_Start(&obj->handle); // Start conversion
<> 149:156823d33999 223
<> 149:156823d33999 224 // Wait end of conversion and get value
AnnaBridge 171:89b338f31ef1 225 if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
AnnaBridge 171:89b338f31ef1 226 return (HAL_ADC_GetValue(&obj->handle));
<> 149:156823d33999 227 } else {
<> 149:156823d33999 228 return 0;
<> 149:156823d33999 229 }
<> 149:156823d33999 230 }
<> 149:156823d33999 231
<> 149:156823d33999 232 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 233 {
<> 149:156823d33999 234 uint16_t value = adc_read(obj);
<> 149:156823d33999 235 // 12-bit to 16-bit conversion
<> 149:156823d33999 236 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 237 return value;
<> 149:156823d33999 238 }
<> 149:156823d33999 239
<> 149:156823d33999 240 float analogin_read(analogin_t *obj)
<> 149:156823d33999 241 {
<> 149:156823d33999 242 uint16_t value = adc_read(obj);
<> 149:156823d33999 243 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 244 }
<> 149:156823d33999 245
<> 149:156823d33999 246 #endif