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targets/TARGET_STM/TARGET_STM32L4/analogin_api.c@163:74e0ce7f98e8, 2017-04-28 (annotated)

Committer:
Anna Bridge
Date:
Fri Apr 28 14:04:18 2017 +0100
Revision:
163:74e0ce7f98e8
Parent:
160:d5399cc887bb
Child:
170:19eb464bc2be
This updates the lib to the mbed lib v141

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 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 {
Anna Bridge 163:74e0ce7f98e8 45 uint32_t function = (uint32_t)NC;
Anna Bridge 163:74e0ce7f98e8 46 obj->adc = (ADCName)NC;
Anna Bridge 163:74e0ce7f98e8 47
Anna Bridge 163:74e0ce7f98e8 48 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
Anna Bridge 163:74e0ce7f98e8 49 // are described in PinNames.h and PeripheralPins.c
Anna Bridge 163:74e0ce7f98e8 50 // Pin value must be >= 0xF0
Anna Bridge 163:74e0ce7f98e8 51 if (pin < 0xF0) {
Anna Bridge 163:74e0ce7f98e8 52 // Normal channels
Anna Bridge 163:74e0ce7f98e8 53 // Get the peripheral name from the pin and assign it to the object
Anna Bridge 163:74e0ce7f98e8 54 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 55 // Get the functions (adc channel) from the pin and assign it to the object
Anna Bridge 163:74e0ce7f98e8 56 function = pinmap_function(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 57 // Configure GPIO
Anna Bridge 163:74e0ce7f98e8 58 pinmap_pinout(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 59 } else {
Anna Bridge 163:74e0ce7f98e8 60 // Internal channels
Anna Bridge 163:74e0ce7f98e8 61 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC_Internal);
Anna Bridge 163:74e0ce7f98e8 62 function = pinmap_function(pin, PinMap_ADC_Internal);
Anna Bridge 163:74e0ce7f98e8 63 // No GPIO configuration for internal channels
Anna Bridge 163:74e0ce7f98e8 64 }
<> 149:156823d33999 65 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 149:156823d33999 66 MBED_ASSERT(function != (uint32_t)NC);
Anna Bridge 163:74e0ce7f98e8 67
<> 149:156823d33999 68 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 69
<> 149:156823d33999 70 // Save pin number for the read function
<> 149:156823d33999 71 obj->pin = pin;
<> 149:156823d33999 72
<> 149:156823d33999 73 // The ADC initialization is done once
<> 149:156823d33999 74 if (adc_inited == 0) {
<> 149:156823d33999 75 adc_inited = 1;
<> 149:156823d33999 76
<> 149:156823d33999 77 // Enable ADC clock
<> 149:156823d33999 78 __HAL_RCC_ADC_CLK_ENABLE();
<> 149:156823d33999 79 __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_SYSCLK);
<> 149:156823d33999 80
<> 149:156823d33999 81 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 82
<> 149:156823d33999 83 // Configure ADC
<> 149:156823d33999 84 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2; // Asynchronous clock mode, input ADC clock
<> 149:156823d33999 85 AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
<> 149:156823d33999 86 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
<> 149:156823d33999 87 AdcHandle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
<> 149:156823d33999 88 AdcHandle.Init.EOCSelection = ADC_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 89 AdcHandle.Init.LowPowerAutoWait = DISABLE;
<> 149:156823d33999 90 AdcHandle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
<> 149:156823d33999 91 AdcHandle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 92 AdcHandle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 93 AdcHandle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 94 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START; // Software start to trig the 1st conversion manually, without external event
<> 149:156823d33999 95 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
<> 149:156823d33999 96 AdcHandle.Init.DMAContinuousRequests = DISABLE;
<> 149:156823d33999 97 AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; // DR register is overwritten with the last conversion result in case of overrun
<> 149:156823d33999 98 AdcHandle.Init.OversamplingMode = DISABLE; // No oversampling
<> 149:156823d33999 99
<> 149:156823d33999 100 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
<> 149:156823d33999 101 error("Cannot initialize ADC\n");
<> 149:156823d33999 102 }
<> 149:156823d33999 103 }
<> 149:156823d33999 104 }
<> 149:156823d33999 105
<> 149:156823d33999 106 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 107 {
<> 149:156823d33999 108 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 109
<> 149:156823d33999 110 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 111
<> 149:156823d33999 112 // Configure ADC channel
<> 149:156823d33999 113 switch (obj->channel) {
<> 149:156823d33999 114 case 0:
<> 149:156823d33999 115 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 116 break;
<> 149:156823d33999 117 case 1:
<> 149:156823d33999 118 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 119 break;
<> 149:156823d33999 120 case 2:
<> 149:156823d33999 121 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 122 break;
<> 149:156823d33999 123 case 3:
<> 149:156823d33999 124 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 125 break;
<> 149:156823d33999 126 case 4:
<> 149:156823d33999 127 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 128 break;
<> 149:156823d33999 129 case 5:
<> 149:156823d33999 130 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 131 break;
<> 149:156823d33999 132 case 6:
<> 149:156823d33999 133 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 134 break;
<> 149:156823d33999 135 case 7:
<> 149:156823d33999 136 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 137 break;
<> 149:156823d33999 138 case 8:
<> 149:156823d33999 139 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 140 break;
<> 149:156823d33999 141 case 9:
<> 149:156823d33999 142 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 143 break;
<> 149:156823d33999 144 case 10:
<> 149:156823d33999 145 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 146 break;
<> 149:156823d33999 147 case 11:
<> 149:156823d33999 148 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 149 break;
<> 149:156823d33999 150 case 12:
<> 149:156823d33999 151 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 152 break;
<> 149:156823d33999 153 case 13:
<> 149:156823d33999 154 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 155 break;
<> 149:156823d33999 156 case 14:
<> 149:156823d33999 157 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 158 break;
<> 149:156823d33999 159 case 15:
<> 149:156823d33999 160 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 161 break;
<> 149:156823d33999 162 case 16:
<> 149:156823d33999 163 sConfig.Channel = ADC_CHANNEL_16;
<> 149:156823d33999 164 break;
<> 149:156823d33999 165 case 17:
<> 149:156823d33999 166 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 167 break;
<> 149:156823d33999 168 case 18:
<> 149:156823d33999 169 sConfig.Channel = ADC_CHANNEL_VBAT;
<> 149:156823d33999 170 break;
<> 149:156823d33999 171 default:
<> 149:156823d33999 172 return 0;
<> 149:156823d33999 173 }
<> 149:156823d33999 174
<> 149:156823d33999 175 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 176 sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5;
<> 149:156823d33999 177 sConfig.SingleDiff = ADC_SINGLE_ENDED;
<> 149:156823d33999 178 sConfig.OffsetNumber = ADC_OFFSET_NONE;
<> 149:156823d33999 179 sConfig.Offset = 0;
<> 149:156823d33999 180
<> 149:156823d33999 181 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
<> 149:156823d33999 182
<> 149:156823d33999 183 HAL_ADC_Start(&AdcHandle); // Start conversion
<> 149:156823d33999 184
<> 149:156823d33999 185 // Wait end of conversion and get value
<> 149:156823d33999 186 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
<> 149:156823d33999 187 return (HAL_ADC_GetValue(&AdcHandle));
<> 149:156823d33999 188 } else {
<> 149:156823d33999 189 return 0;
<> 149:156823d33999 190 }
<> 149:156823d33999 191 }
<> 149:156823d33999 192
<> 149:156823d33999 193 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 194 {
<> 149:156823d33999 195 uint16_t value = adc_read(obj);
<> 149:156823d33999 196 // 12-bit to 16-bit conversion
<> 149:156823d33999 197 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 198 return value;
<> 149:156823d33999 199 }
<> 149:156823d33999 200
<> 149:156823d33999 201 float analogin_read(analogin_t *obj)
<> 149:156823d33999 202 {
<> 149:156823d33999 203 uint16_t value = adc_read(obj);
<> 149:156823d33999 204 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 205 }
<> 149:156823d33999 206
<> 149:156823d33999 207 #endif