Amit Gandhi / mbed-dev

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targets/TARGET_STM/TARGET_STM32L4/analogin_api.c@178:d650f5d4c87a, 2017-11-08 (annotated)

Committer:
AnnaBridge
Date:
Wed Nov 08 13:50:44 2017 +0000
Revision:
178:d650f5d4c87a
Parent:
172:89b338f31ef1 
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 int adc_inited = 0;
<> 149:156823d33999 40
<> 149:156823d33999 41 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 42 {
Anna Bridge 163:74e0ce7f98e8 43 uint32_t function = (uint32_t)NC;
Anna Bridge 163:74e0ce7f98e8 44
Anna Bridge 163:74e0ce7f98e8 45 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
Anna Bridge 163:74e0ce7f98e8 46 // are described in PinNames.h and PeripheralPins.c
Kojto 171:19eb464bc2be 47 // Pin value must be between 0xF0 and 0xFF
Kojto 171:19eb464bc2be 48 if ((pin < 0xF0) || (pin >= 0x100)) {
Anna Bridge 163:74e0ce7f98e8 49 // Normal channels
Anna Bridge 163:74e0ce7f98e8 50 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 172:89b338f31ef1 51 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 52 // Get the functions (adc channel) from the pin and assign it to the object
Anna Bridge 163:74e0ce7f98e8 53 function = pinmap_function(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 54 // Configure GPIO
Anna Bridge 163:74e0ce7f98e8 55 pinmap_pinout(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 56 } else {
Anna Bridge 163:74e0ce7f98e8 57 // Internal channels
AnnaBridge 172:89b338f31ef1 58 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC_Internal);
Anna Bridge 163:74e0ce7f98e8 59 function = pinmap_function(pin, PinMap_ADC_Internal);
Anna Bridge 163:74e0ce7f98e8 60 // No GPIO configuration for internal channels
Anna Bridge 163:74e0ce7f98e8 61 }
AnnaBridge 172:89b338f31ef1 62 MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
<> 149:156823d33999 63 MBED_ASSERT(function != (uint32_t)NC);
Anna Bridge 163:74e0ce7f98e8 64
<> 149:156823d33999 65 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 66
<> 149:156823d33999 67 // Save pin number for the read function
<> 149:156823d33999 68 obj->pin = pin;
<> 149:156823d33999 69
<> 149:156823d33999 70 // The ADC initialization is done once
<> 149:156823d33999 71 if (adc_inited == 0) {
<> 149:156823d33999 72 adc_inited = 1;
<> 149:156823d33999 73
<> 149:156823d33999 74 // Enable ADC clock
<> 149:156823d33999 75 __HAL_RCC_ADC_CLK_ENABLE();
<> 149:156823d33999 76 __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_SYSCLK);
<> 149:156823d33999 77
AnnaBridge 172:89b338f31ef1 78 obj->handle.State = HAL_ADC_STATE_RESET;
<> 149:156823d33999 79 // Configure ADC
AnnaBridge 172:89b338f31ef1 80 obj->handle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2; // Asynchronous clock mode, input ADC clock
AnnaBridge 172:89b338f31ef1 81 obj->handle.Init.Resolution = ADC_RESOLUTION_12B;
AnnaBridge 172:89b338f31ef1 82 obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AnnaBridge 172:89b338f31ef1 83 obj->handle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
AnnaBridge 172:89b338f31ef1 84 obj->handle.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).
AnnaBridge 172:89b338f31ef1 85 obj->handle.Init.LowPowerAutoWait = DISABLE;
AnnaBridge 172:89b338f31ef1 86 obj->handle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
AnnaBridge 172:89b338f31ef1 87 obj->handle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
AnnaBridge 172:89b338f31ef1 88 obj->handle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
AnnaBridge 172:89b338f31ef1 89 obj->handle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
AnnaBridge 172:89b338f31ef1 90 obj->handle.Init.ExternalTrigConv = ADC_SOFTWARE_START; // Software start to trig the 1st conversion manually, without external event
AnnaBridge 172:89b338f31ef1 91 obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AnnaBridge 172:89b338f31ef1 92 obj->handle.Init.DMAContinuousRequests = DISABLE;
AnnaBridge 172:89b338f31ef1 93 obj->handle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; // DR register is overwritten with the last conversion result in case of overrun
AnnaBridge 172:89b338f31ef1 94 obj->handle.Init.OversamplingMode = DISABLE; // No oversampling
<> 149:156823d33999 95
AnnaBridge 172:89b338f31ef1 96 if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
<> 149:156823d33999 97 error("Cannot initialize ADC\n");
<> 149:156823d33999 98 }
<> 149:156823d33999 99 }
<> 149:156823d33999 100 }
<> 149:156823d33999 101
<> 149:156823d33999 102 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 103 {
<> 149:156823d33999 104 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 105
<> 149:156823d33999 106 // Configure ADC channel
<> 149:156823d33999 107 switch (obj->channel) {
<> 149:156823d33999 108 case 0:
<> 149:156823d33999 109 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 110 break;
<> 149:156823d33999 111 case 1:
<> 149:156823d33999 112 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 113 break;
<> 149:156823d33999 114 case 2:
<> 149:156823d33999 115 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 116 break;
<> 149:156823d33999 117 case 3:
<> 149:156823d33999 118 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 119 break;
<> 149:156823d33999 120 case 4:
<> 149:156823d33999 121 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 122 break;
<> 149:156823d33999 123 case 5:
<> 149:156823d33999 124 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 125 break;
<> 149:156823d33999 126 case 6:
<> 149:156823d33999 127 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 128 break;
<> 149:156823d33999 129 case 7:
<> 149:156823d33999 130 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 131 break;
<> 149:156823d33999 132 case 8:
<> 149:156823d33999 133 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 134 break;
<> 149:156823d33999 135 case 9:
<> 149:156823d33999 136 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 137 break;
<> 149:156823d33999 138 case 10:
<> 149:156823d33999 139 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 140 break;
<> 149:156823d33999 141 case 11:
<> 149:156823d33999 142 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 143 break;
<> 149:156823d33999 144 case 12:
<> 149:156823d33999 145 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 146 break;
<> 149:156823d33999 147 case 13:
<> 149:156823d33999 148 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 149 break;
<> 149:156823d33999 150 case 14:
<> 149:156823d33999 151 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 152 break;
<> 149:156823d33999 153 case 15:
<> 149:156823d33999 154 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 155 break;
<> 149:156823d33999 156 case 16:
<> 149:156823d33999 157 sConfig.Channel = ADC_CHANNEL_16;
<> 149:156823d33999 158 break;
<> 149:156823d33999 159 case 17:
<> 149:156823d33999 160 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 161 break;
<> 149:156823d33999 162 case 18:
<> 149:156823d33999 163 sConfig.Channel = ADC_CHANNEL_VBAT;
<> 149:156823d33999 164 break;
<> 149:156823d33999 165 default:
<> 149:156823d33999 166 return 0;
<> 149:156823d33999 167 }
<> 149:156823d33999 168
<> 149:156823d33999 169 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 170 sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5;
<> 149:156823d33999 171 sConfig.SingleDiff = ADC_SINGLE_ENDED;
<> 149:156823d33999 172 sConfig.OffsetNumber = ADC_OFFSET_NONE;
<> 149:156823d33999 173 sConfig.Offset = 0;
<> 149:156823d33999 174
AnnaBridge 172:89b338f31ef1 175 HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
<> 149:156823d33999 176
AnnaBridge 172:89b338f31ef1 177 HAL_ADC_Start(&obj->handle); // Start conversion
<> 149:156823d33999 178
<> 149:156823d33999 179 // Wait end of conversion and get value
AnnaBridge 172:89b338f31ef1 180 if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
AnnaBridge 172:89b338f31ef1 181 return (HAL_ADC_GetValue(&obj->handle));
<> 149:156823d33999 182 } else {
<> 149:156823d33999 183 return 0;
<> 149:156823d33999 184 }
<> 149:156823d33999 185 }
<> 149:156823d33999 186
<> 149:156823d33999 187 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 188 {
<> 149:156823d33999 189 uint16_t value = adc_read(obj);
<> 149:156823d33999 190 // 12-bit to 16-bit conversion
<> 149:156823d33999 191 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 192 return value;
<> 149:156823d33999 193 }
<> 149:156823d33999 194
<> 149:156823d33999 195 float analogin_read(analogin_t *obj)
<> 149:156823d33999 196 {
<> 149:156823d33999 197 uint16_t value = adc_read(obj);
<> 149:156823d33999 198 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 199 }
<> 149:156823d33999 200
<> 149:156823d33999 201 #endif