Fawwaz Nadzmy / mbed-STM

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L1/analogin_api.c@153:9398a535854b, 2016-12-22 (annotated)

Committer:
fwndz
Date:
Thu Dec 22 05:12:40 2016 +0000
Revision:
153:9398a535854b
Parent:
150:02e0a0aed4ec 
device target maximize

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
<> 149:156823d33999 33 #include "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 ADC_HandleTypeDef AdcHandle;
<> 149:156823d33999 40
<> 149:156823d33999 41 int adc_inited = 0;
<> 149:156823d33999 42
<> 149:156823d33999 43 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 44 {
<> 149:156823d33999 45 RCC_OscInitTypeDef RCC_OscInitStruct;
<> 149:156823d33999 46
<> 149:156823d33999 47 // Get the peripheral name from the pin and assign it to the object
<> 149:156823d33999 48 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 149:156823d33999 49 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 149:156823d33999 50
<> 149:156823d33999 51 // Get the pin function and assign the used channel to the object
<> 149:156823d33999 52 uint32_t function = pinmap_function(pin, PinMap_ADC);
<> 149:156823d33999 53 MBED_ASSERT(function != (uint32_t)NC);
<> 149:156823d33999 54 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 55
<> 150:02e0a0aed4ec 56 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
<> 150:02e0a0aed4ec 57 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
<> 150:02e0a0aed4ec 58 if (pin < 0xF0) {
<> 149:156823d33999 59 pinmap_pinout(pin, PinMap_ADC);
<> 149:156823d33999 60 }
<> 149:156823d33999 61
<> 149:156823d33999 62 // Save pin number for the read function
<> 149:156823d33999 63 obj->pin = pin;
<> 149:156823d33999 64
<> 149:156823d33999 65 // The ADC initialization is done once
<> 149:156823d33999 66 if (adc_inited == 0) {
<> 149:156823d33999 67 adc_inited = 1;
<> 149:156823d33999 68
<> 149:156823d33999 69 // Enable the HSI (to clock the ADC)
<> 149:156823d33999 70 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
<> 149:156823d33999 71 RCC_OscInitStruct.HSIState = RCC_HSI_ON;
<> 149:156823d33999 72 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
<> 149:156823d33999 73 HAL_RCC_OscConfig(&RCC_OscInitStruct);
<> 149:156823d33999 74
<> 149:156823d33999 75 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 76
<> 149:156823d33999 77 // Enable ADC clock
<> 149:156823d33999 78 __ADC1_CLK_ENABLE();
<> 149:156823d33999 79
<> 149:156823d33999 80 // Configure ADC
<> 149:156823d33999 81 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
<> 149:156823d33999 82 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
<> 149:156823d33999 83 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
<> 149:156823d33999 84 AdcHandle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
<> 149:156823d33999 85 AdcHandle.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).
<> 149:156823d33999 86 AdcHandle.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.
<> 149:156823d33999 87 AdcHandle.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).
<> 149:156823d33999 88 AdcHandle.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
<> 149:156823d33999 89 AdcHandle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
<> 149:156823d33999 90 AdcHandle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 91 AdcHandle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 92 AdcHandle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 93 AdcHandle.Init.ExternalTrigConv = 0; // Not used
<> 149:156823d33999 94 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
<> 149:156823d33999 95 AdcHandle.Init.DMAContinuousRequests = DISABLE;
<> 149:156823d33999 96
<> 149:156823d33999 97 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
<> 149:156823d33999 98 error("Cannot initialize ADC");
<> 149:156823d33999 99 }
<> 149:156823d33999 100 }
<> 149:156823d33999 101 }
<> 149:156823d33999 102
<> 149:156823d33999 103 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 104 {
<> 149:156823d33999 105 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 106
<> 149:156823d33999 107 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 108
<> 149:156823d33999 109 // Configure ADC channel
<> 149:156823d33999 110 switch (obj->channel) {
<> 149:156823d33999 111 case 0:
<> 149:156823d33999 112 sConfig.Channel = ADC_CHANNEL_0;
<> 149:156823d33999 113 break;
<> 149:156823d33999 114 case 1:
<> 149:156823d33999 115 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 116 break;
<> 149:156823d33999 117 case 2:
<> 149:156823d33999 118 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 119 break;
<> 149:156823d33999 120 case 3:
<> 149:156823d33999 121 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 122 break;
<> 149:156823d33999 123 case 4:
<> 149:156823d33999 124 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 125 break;
<> 149:156823d33999 126 case 5:
<> 149:156823d33999 127 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 128 break;
<> 149:156823d33999 129 case 6:
<> 149:156823d33999 130 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 131 break;
<> 149:156823d33999 132 case 7:
<> 149:156823d33999 133 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 134 break;
<> 149:156823d33999 135 case 8:
<> 149:156823d33999 136 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 137 break;
<> 149:156823d33999 138 case 9:
<> 149:156823d33999 139 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 140 break;
<> 149:156823d33999 141 case 10:
<> 149:156823d33999 142 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 143 break;
<> 149:156823d33999 144 case 11:
<> 149:156823d33999 145 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 146 break;
<> 149:156823d33999 147 case 12:
<> 149:156823d33999 148 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 149 break;
<> 149:156823d33999 150 case 13:
<> 149:156823d33999 151 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 152 break;
<> 149:156823d33999 153 case 14:
<> 149:156823d33999 154 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 155 break;
<> 149:156823d33999 156 case 15:
<> 149:156823d33999 157 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 158 break;
<> 149:156823d33999 159 case 16:
<> 149:156823d33999 160 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 161 break;
<> 149:156823d33999 162 case 17:
<> 149:156823d33999 163 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 164 break;
<> 149:156823d33999 165 case 18:
<> 149:156823d33999 166 sConfig.Channel = ADC_CHANNEL_18;
<> 149:156823d33999 167 break;
<> 149:156823d33999 168 case 19:
<> 149:156823d33999 169 sConfig.Channel = ADC_CHANNEL_19;
<> 149:156823d33999 170 break;
<> 149:156823d33999 171 case 20:
<> 149:156823d33999 172 sConfig.Channel = ADC_CHANNEL_20;
<> 149:156823d33999 173 break;
<> 149:156823d33999 174 case 21:
<> 149:156823d33999 175 sConfig.Channel = ADC_CHANNEL_21;
<> 149:156823d33999 176 break;
<> 149:156823d33999 177 case 22:
<> 149:156823d33999 178 sConfig.Channel = ADC_CHANNEL_22;
<> 149:156823d33999 179 break;
<> 149:156823d33999 180 case 23:
<> 149:156823d33999 181 sConfig.Channel = ADC_CHANNEL_23;
<> 149:156823d33999 182 break;
<> 149:156823d33999 183 case 24:
<> 149:156823d33999 184 sConfig.Channel = ADC_CHANNEL_24;
<> 149:156823d33999 185 break;
<> 149:156823d33999 186 case 25:
<> 149:156823d33999 187 sConfig.Channel = ADC_CHANNEL_25;
<> 149:156823d33999 188 break;
<> 149:156823d33999 189 case 26:
<> 149:156823d33999 190 sConfig.Channel = ADC_CHANNEL_26;
<> 149:156823d33999 191 break;
<> 149:156823d33999 192 #ifdef ADC_CHANNEL_27
<> 149:156823d33999 193 case 27:
<> 149:156823d33999 194 sConfig.Channel = ADC_CHANNEL_27;
<> 149:156823d33999 195 break;
<> 149:156823d33999 196 #endif
<> 149:156823d33999 197 #ifdef ADC_CHANNEL_28
<> 149:156823d33999 198 case 28:
<> 149:156823d33999 199 sConfig.Channel = ADC_CHANNEL_28;
<> 149:156823d33999 200 break;
<> 149:156823d33999 201 #endif
<> 149:156823d33999 202 #ifdef ADC_CHANNEL_29
<> 149:156823d33999 203 case 29:
<> 149:156823d33999 204 sConfig.Channel = ADC_CHANNEL_29;
<> 149:156823d33999 205 break;
<> 149:156823d33999 206 #endif
<> 149:156823d33999 207 #ifdef ADC_CHANNEL_30
<> 149:156823d33999 208 case 30:
<> 149:156823d33999 209 sConfig.Channel = ADC_CHANNEL_30;
<> 149:156823d33999 210 break;
<> 149:156823d33999 211 #endif
<> 149:156823d33999 212 #ifdef ADC_CHANNEL_31
<> 149:156823d33999 213 case 31:
<> 149:156823d33999 214 sConfig.Channel = ADC_CHANNEL_31;
<> 149:156823d33999 215 break;
<> 149:156823d33999 216 #endif
<> 149:156823d33999 217 default:
<> 149:156823d33999 218 return 0;
<> 149:156823d33999 219 }
<> 149:156823d33999 220
<> 149:156823d33999 221 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 222 sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES;
<> 149:156823d33999 223
<> 149:156823d33999 224 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
<> 149:156823d33999 225
<> 149:156823d33999 226 HAL_ADC_Start(&AdcHandle); // Start conversion
<> 149:156823d33999 227
<> 149:156823d33999 228 // Wait end of conversion and get value
<> 149:156823d33999 229 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
<> 149:156823d33999 230 return (HAL_ADC_GetValue(&AdcHandle));
<> 149:156823d33999 231 } else {
<> 149:156823d33999 232 return 0;
<> 149:156823d33999 233 }
<> 149:156823d33999 234 }
<> 149:156823d33999 235
<> 149:156823d33999 236 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 237 {
<> 149:156823d33999 238 uint16_t value = adc_read(obj);
<> 149:156823d33999 239 // 12-bit to 16-bit conversion
<> 149:156823d33999 240 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 241 return value;
<> 149:156823d33999 242 }
<> 149:156823d33999 243
<> 149:156823d33999 244 float analogin_read(analogin_t *obj)
<> 149:156823d33999 245 {
<> 149:156823d33999 246 uint16_t value = adc_read(obj);
<> 149:156823d33999 247 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 248 }
<> 149:156823d33999 249
<> 149:156823d33999 250 #endif