Nothing Special / mbed-STM32F103C8

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-STM32F103C8_org by Nothing Special

targets/TARGET_STM/TARGET_STM32F1/analogin_api.c@148:8b0b02bf146f, 2017-04-27 (annotated)

Committer:
mega64
Date:
Thu Apr 27 23:56:38 2017 +0000
Revision:
148:8b0b02bf146f
Parent:
146:03e976389d16 
Remove unnecessary folders

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mega64 146:03e976389d16 1 /* mbed Microcontroller Library
mega64 146:03e976389d16 2 * Copyright (c) 2016, STMicroelectronics
mega64 146:03e976389d16 3 * All rights reserved.
mega64 146:03e976389d16 4 *
mega64 146:03e976389d16 5 * Redistribution and use in source and binary forms, with or without
mega64 146:03e976389d16 6 * modification, are permitted provided that the following conditions are met:
mega64 146:03e976389d16 7 *
mega64 146:03e976389d16 8 * 1. Redistributions of source code must retain the above copyright notice,
mega64 146:03e976389d16 9 * this list of conditions and the following disclaimer.
mega64 146:03e976389d16 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mega64 146:03e976389d16 11 * this list of conditions and the following disclaimer in the documentation
mega64 146:03e976389d16 12 * and/or other materials provided with the distribution.
mega64 146:03e976389d16 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mega64 146:03e976389d16 14 * may be used to endorse or promote products derived from this software
mega64 146:03e976389d16 15 * without specific prior written permission.
mega64 146:03e976389d16 16 *
mega64 146:03e976389d16 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mega64 146:03e976389d16 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mega64 146:03e976389d16 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mega64 146:03e976389d16 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mega64 146:03e976389d16 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mega64 146:03e976389d16 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mega64 146:03e976389d16 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mega64 146:03e976389d16 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mega64 146:03e976389d16 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mega64 146:03e976389d16 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mega64 146:03e976389d16 27 */
mega64 146:03e976389d16 28 #include "mbed_assert.h"
mega64 146:03e976389d16 29 #include "analogin_api.h"
mega64 146:03e976389d16 30
mega64 146:03e976389d16 31 #if DEVICE_ANALOGIN
mega64 146:03e976389d16 32
mega64 146:03e976389d16 33 #include "mbed_wait_api.h"
mega64 146:03e976389d16 34 #include "cmsis.h"
mega64 146:03e976389d16 35 #include "pinmap.h"
mega64 146:03e976389d16 36 #include "PeripheralPins.h"
mega64 146:03e976389d16 37
mega64 146:03e976389d16 38 ADC_HandleTypeDef AdcHandle;
mega64 146:03e976389d16 39
mega64 146:03e976389d16 40 int adc_inited = 0;
mega64 146:03e976389d16 41
mega64 146:03e976389d16 42 void analogin_init(analogin_t *obj, PinName pin)
mega64 146:03e976389d16 43 {
mega64 146:03e976389d16 44 RCC_PeriphCLKInitTypeDef PeriphClkInit;
mega64 146:03e976389d16 45
mega64 146:03e976389d16 46 // Get the peripheral name from the pin and assign it to the object
mega64 146:03e976389d16 47 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mega64 146:03e976389d16 48 MBED_ASSERT(obj->adc != (ADCName)NC);
mega64 146:03e976389d16 49
mega64 146:03e976389d16 50 // Get the functions (adc channel) from the pin and assign it to the object
mega64 146:03e976389d16 51 uint32_t function = pinmap_function(pin, PinMap_ADC);
mega64 146:03e976389d16 52 MBED_ASSERT(function != (uint32_t)NC);
mega64 146:03e976389d16 53 obj->channel = STM_PIN_CHANNEL(function);
mega64 146:03e976389d16 54
mega64 146:03e976389d16 55 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
mega64 146:03e976389d16 56 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
mega64 146:03e976389d16 57 if (pin < 0xF0) {
mega64 146:03e976389d16 58 pinmap_pinout(pin, PinMap_ADC);
mega64 146:03e976389d16 59 }
mega64 146:03e976389d16 60
mega64 146:03e976389d16 61 // Save pin number for the read function
mega64 146:03e976389d16 62 obj->pin = pin;
mega64 146:03e976389d16 63
mega64 146:03e976389d16 64 // The ADC initialization is done once
mega64 146:03e976389d16 65 if (adc_inited == 0) {
mega64 146:03e976389d16 66 adc_inited = 1;
mega64 146:03e976389d16 67
mega64 146:03e976389d16 68 // Enable ADC clock
mega64 146:03e976389d16 69 __HAL_RCC_ADC1_CLK_ENABLE();
mega64 146:03e976389d16 70
mega64 146:03e976389d16 71 // Configure ADC clock prescaler
mega64 146:03e976389d16 72 // Caution: On STM32F1, ADC clock frequency max is 14 MHz (refer to device datasheet).
mega64 146:03e976389d16 73 // Therefore, ADC clock prescaler must be configured in function
mega64 146:03e976389d16 74 // of ADC clock source frequency to remain below this maximum frequency.
mega64 146:03e976389d16 75 // with 8 MHz external xtal: PCLK2 = 72 MHz --> ADC clock = 72/6 = 12 MHz
mega64 146:03e976389d16 76 // with internal clock : PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.67 MHz
mega64 146:03e976389d16 77 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
mega64 146:03e976389d16 78 PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
mega64 146:03e976389d16 79 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
mega64 146:03e976389d16 80
mega64 146:03e976389d16 81 // Configure ADC
mega64 146:03e976389d16 82 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mega64 146:03e976389d16 83 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mega64 146:03e976389d16 84 AdcHandle.Init.ScanConvMode = DISABLE;
mega64 146:03e976389d16 85 AdcHandle.Init.ContinuousConvMode = DISABLE;
mega64 146:03e976389d16 86 AdcHandle.Init.NbrOfConversion = 1;
mega64 146:03e976389d16 87 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mega64 146:03e976389d16 88 AdcHandle.Init.NbrOfDiscConversion = 0;
mega64 146:03e976389d16 89 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
mega64 146:03e976389d16 90 HAL_ADC_Init(&AdcHandle);
mega64 146:03e976389d16 91 }
mega64 146:03e976389d16 92 }
mega64 146:03e976389d16 93
mega64 146:03e976389d16 94 static inline uint16_t adc_read(analogin_t *obj)
mega64 146:03e976389d16 95 {
mega64 146:03e976389d16 96 ADC_ChannelConfTypeDef sConfig;
mega64 146:03e976389d16 97
mega64 146:03e976389d16 98 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mega64 146:03e976389d16 99
mega64 146:03e976389d16 100 // Configure ADC channel
mega64 146:03e976389d16 101 sConfig.Rank = 1;
mega64 146:03e976389d16 102 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
mega64 146:03e976389d16 103
mega64 146:03e976389d16 104 switch (obj->channel) {
mega64 146:03e976389d16 105 case 0:
mega64 146:03e976389d16 106 sConfig.Channel = ADC_CHANNEL_0;
mega64 146:03e976389d16 107 break;
mega64 146:03e976389d16 108 case 1:
mega64 146:03e976389d16 109 sConfig.Channel = ADC_CHANNEL_1;
mega64 146:03e976389d16 110 break;
mega64 146:03e976389d16 111 case 2:
mega64 146:03e976389d16 112 sConfig.Channel = ADC_CHANNEL_2;
mega64 146:03e976389d16 113 break;
mega64 146:03e976389d16 114 case 3:
mega64 146:03e976389d16 115 sConfig.Channel = ADC_CHANNEL_3;
mega64 146:03e976389d16 116 break;
mega64 146:03e976389d16 117 case 4:
mega64 146:03e976389d16 118 sConfig.Channel = ADC_CHANNEL_4;
mega64 146:03e976389d16 119 break;
mega64 146:03e976389d16 120 case 5:
mega64 146:03e976389d16 121 sConfig.Channel = ADC_CHANNEL_5;
mega64 146:03e976389d16 122 break;
mega64 146:03e976389d16 123 case 6:
mega64 146:03e976389d16 124 sConfig.Channel = ADC_CHANNEL_6;
mega64 146:03e976389d16 125 break;
mega64 146:03e976389d16 126 case 7:
mega64 146:03e976389d16 127 sConfig.Channel = ADC_CHANNEL_7;
mega64 146:03e976389d16 128 break;
mega64 146:03e976389d16 129 case 8:
mega64 146:03e976389d16 130 sConfig.Channel = ADC_CHANNEL_8;
mega64 146:03e976389d16 131 break;
mega64 146:03e976389d16 132 case 9:
mega64 146:03e976389d16 133 sConfig.Channel = ADC_CHANNEL_9;
mega64 146:03e976389d16 134 break;
mega64 146:03e976389d16 135 case 10:
mega64 146:03e976389d16 136 sConfig.Channel = ADC_CHANNEL_10;
mega64 146:03e976389d16 137 break;
mega64 146:03e976389d16 138 case 11:
mega64 146:03e976389d16 139 sConfig.Channel = ADC_CHANNEL_11;
mega64 146:03e976389d16 140 break;
mega64 146:03e976389d16 141 case 12:
mega64 146:03e976389d16 142 sConfig.Channel = ADC_CHANNEL_12;
mega64 146:03e976389d16 143 break;
mega64 146:03e976389d16 144 case 13:
mega64 146:03e976389d16 145 sConfig.Channel = ADC_CHANNEL_13;
mega64 146:03e976389d16 146 break;
mega64 146:03e976389d16 147 case 14:
mega64 146:03e976389d16 148 sConfig.Channel = ADC_CHANNEL_14;
mega64 146:03e976389d16 149 break;
mega64 146:03e976389d16 150 case 15:
mega64 146:03e976389d16 151 sConfig.Channel = ADC_CHANNEL_15;
mega64 146:03e976389d16 152 break;
mega64 146:03e976389d16 153 case 16:
mega64 146:03e976389d16 154 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
mega64 146:03e976389d16 155 break;
mega64 146:03e976389d16 156 case 17:
mega64 146:03e976389d16 157 sConfig.Channel = ADC_CHANNEL_VREFINT;
mega64 146:03e976389d16 158 break;
mega64 146:03e976389d16 159 default:
mega64 146:03e976389d16 160 return 0;
mega64 146:03e976389d16 161 }
mega64 146:03e976389d16 162
mega64 146:03e976389d16 163 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mega64 146:03e976389d16 164
mega64 146:03e976389d16 165 HAL_ADC_Start(&AdcHandle); // Start conversion
mega64 146:03e976389d16 166
mega64 146:03e976389d16 167 // Wait end of conversion and get value
mega64 146:03e976389d16 168 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mega64 146:03e976389d16 169 return (HAL_ADC_GetValue(&AdcHandle));
mega64 146:03e976389d16 170 } else {
mega64 146:03e976389d16 171 return 0;
mega64 146:03e976389d16 172 }
mega64 146:03e976389d16 173 }
mega64 146:03e976389d16 174
mega64 146:03e976389d16 175 uint16_t analogin_read_u16(analogin_t *obj)
mega64 146:03e976389d16 176 {
mega64 146:03e976389d16 177 uint16_t value = adc_read(obj);
mega64 146:03e976389d16 178 // 12-bit to 16-bit conversion
mega64 146:03e976389d16 179 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mega64 146:03e976389d16 180 return value;
mega64 146:03e976389d16 181 }
mega64 146:03e976389d16 182
mega64 146:03e976389d16 183 float analogin_read(analogin_t *obj)
mega64 146:03e976389d16 184 {
mega64 146:03e976389d16 185 uint16_t value = adc_read(obj);
mega64 146:03e976389d16 186 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mega64 146:03e976389d16 187 }
mega64 146:03e976389d16 188
mega64 146:03e976389d16 189 #endif