Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32F1/analogin_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2016, STMicroelectronics
elessair 0:f269e3021894 3 * All rights reserved.
elessair 0:f269e3021894 4 *
elessair 0:f269e3021894 5 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 6 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 9 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 11 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 12 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 14 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 15 * without specific prior written permission.
elessair 0:f269e3021894 16 *
elessair 0:f269e3021894 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 27 */
elessair 0:f269e3021894 28 #include "mbed_assert.h"
elessair 0:f269e3021894 29 #include "analogin_api.h"
elessair 0:f269e3021894 30
elessair 0:f269e3021894 31 #if DEVICE_ANALOGIN
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #include "wait_api.h"
elessair 0:f269e3021894 34 #include "cmsis.h"
elessair 0:f269e3021894 35 #include "pinmap.h"
elessair 0:f269e3021894 36 #include "PeripheralPins.h"
elessair 0:f269e3021894 37
elessair 0:f269e3021894 38 ADC_HandleTypeDef AdcHandle;
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 int adc_inited = 0;
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 void analogin_init(analogin_t *obj, PinName pin)
elessair 0:f269e3021894 43 {
elessair 0:f269e3021894 44 RCC_PeriphCLKInitTypeDef PeriphClkInit;
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 // Get the peripheral name from the pin and assign it to the object
elessair 0:f269e3021894 47 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
elessair 0:f269e3021894 48 MBED_ASSERT(obj->adc != (ADCName)NC);
elessair 0:f269e3021894 49
elessair 0:f269e3021894 50 // Get the functions (adc channel) from the pin and assign it to the object
elessair 0:f269e3021894 51 uint32_t function = pinmap_function(pin, PinMap_ADC);
elessair 0:f269e3021894 52 MBED_ASSERT(function != (uint32_t)NC);
elessair 0:f269e3021894 53 obj->channel = STM_PIN_CHANNEL(function);
elessair 0:f269e3021894 54
elessair 0:f269e3021894 55 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
elessair 0:f269e3021894 56 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
elessair 0:f269e3021894 57 if (pin < 0xF0) {
elessair 0:f269e3021894 58 pinmap_pinout(pin, PinMap_ADC);
elessair 0:f269e3021894 59 }
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 // Save pin number for the read function
elessair 0:f269e3021894 62 obj->pin = pin;
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 // The ADC initialization is done once
elessair 0:f269e3021894 65 if (adc_inited == 0) {
elessair 0:f269e3021894 66 adc_inited = 1;
elessair 0:f269e3021894 67
elessair 0:f269e3021894 68 // Enable ADC clock
elessair 0:f269e3021894 69 __HAL_RCC_ADC1_CLK_ENABLE();
elessair 0:f269e3021894 70
elessair 0:f269e3021894 71 // Configure ADC clock prescaler
elessair 0:f269e3021894 72 // Caution: On STM32F1, ADC clock frequency max is 14 MHz (refer to device datasheet).
elessair 0:f269e3021894 73 // Therefore, ADC clock prescaler must be configured in function
elessair 0:f269e3021894 74 // of ADC clock source frequency to remain below this maximum frequency.
elessair 0:f269e3021894 75 // with 8 MHz external xtal: PCLK2 = 72 MHz --> ADC clock = 72/6 = 12 MHz
elessair 0:f269e3021894 76 // with internal clock : PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.67 MHz
elessair 0:f269e3021894 77 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
elessair 0:f269e3021894 78 PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
elessair 0:f269e3021894 79 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
elessair 0:f269e3021894 80
elessair 0:f269e3021894 81 // Configure ADC
elessair 0:f269e3021894 82 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
elessair 0:f269e3021894 83 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
elessair 0:f269e3021894 84 AdcHandle.Init.ScanConvMode = DISABLE;
elessair 0:f269e3021894 85 AdcHandle.Init.ContinuousConvMode = DISABLE;
elessair 0:f269e3021894 86 AdcHandle.Init.NbrOfConversion = 1;
elessair 0:f269e3021894 87 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
elessair 0:f269e3021894 88 AdcHandle.Init.NbrOfDiscConversion = 0;
elessair 0:f269e3021894 89 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
elessair 0:f269e3021894 90 HAL_ADC_Init(&AdcHandle);
elessair 0:f269e3021894 91 }
elessair 0:f269e3021894 92 }
elessair 0:f269e3021894 93
elessair 0:f269e3021894 94 static inline uint16_t adc_read(analogin_t *obj)
elessair 0:f269e3021894 95 {
elessair 0:f269e3021894 96 ADC_ChannelConfTypeDef sConfig;
elessair 0:f269e3021894 97
elessair 0:f269e3021894 98 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
elessair 0:f269e3021894 99
elessair 0:f269e3021894 100 // Configure ADC channel
elessair 0:f269e3021894 101 sConfig.Rank = 1;
elessair 0:f269e3021894 102 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
elessair 0:f269e3021894 103
elessair 0:f269e3021894 104 switch (obj->channel) {
elessair 0:f269e3021894 105 case 0:
elessair 0:f269e3021894 106 sConfig.Channel = ADC_CHANNEL_0;
elessair 0:f269e3021894 107 break;
elessair 0:f269e3021894 108 case 1:
elessair 0:f269e3021894 109 sConfig.Channel = ADC_CHANNEL_1;
elessair 0:f269e3021894 110 break;
elessair 0:f269e3021894 111 case 2:
elessair 0:f269e3021894 112 sConfig.Channel = ADC_CHANNEL_2;
elessair 0:f269e3021894 113 break;
elessair 0:f269e3021894 114 case 3:
elessair 0:f269e3021894 115 sConfig.Channel = ADC_CHANNEL_3;
elessair 0:f269e3021894 116 break;
elessair 0:f269e3021894 117 case 4:
elessair 0:f269e3021894 118 sConfig.Channel = ADC_CHANNEL_4;
elessair 0:f269e3021894 119 break;
elessair 0:f269e3021894 120 case 5:
elessair 0:f269e3021894 121 sConfig.Channel = ADC_CHANNEL_5;
elessair 0:f269e3021894 122 break;
elessair 0:f269e3021894 123 case 6:
elessair 0:f269e3021894 124 sConfig.Channel = ADC_CHANNEL_6;
elessair 0:f269e3021894 125 break;
elessair 0:f269e3021894 126 case 7:
elessair 0:f269e3021894 127 sConfig.Channel = ADC_CHANNEL_7;
elessair 0:f269e3021894 128 break;
elessair 0:f269e3021894 129 case 8:
elessair 0:f269e3021894 130 sConfig.Channel = ADC_CHANNEL_8;
elessair 0:f269e3021894 131 break;
elessair 0:f269e3021894 132 case 9:
elessair 0:f269e3021894 133 sConfig.Channel = ADC_CHANNEL_9;
elessair 0:f269e3021894 134 break;
elessair 0:f269e3021894 135 case 10:
elessair 0:f269e3021894 136 sConfig.Channel = ADC_CHANNEL_10;
elessair 0:f269e3021894 137 break;
elessair 0:f269e3021894 138 case 11:
elessair 0:f269e3021894 139 sConfig.Channel = ADC_CHANNEL_11;
elessair 0:f269e3021894 140 break;
elessair 0:f269e3021894 141 case 12:
elessair 0:f269e3021894 142 sConfig.Channel = ADC_CHANNEL_12;
elessair 0:f269e3021894 143 break;
elessair 0:f269e3021894 144 case 13:
elessair 0:f269e3021894 145 sConfig.Channel = ADC_CHANNEL_13;
elessair 0:f269e3021894 146 break;
elessair 0:f269e3021894 147 case 14:
elessair 0:f269e3021894 148 sConfig.Channel = ADC_CHANNEL_14;
elessair 0:f269e3021894 149 break;
elessair 0:f269e3021894 150 case 15:
elessair 0:f269e3021894 151 sConfig.Channel = ADC_CHANNEL_15;
elessair 0:f269e3021894 152 break;
elessair 0:f269e3021894 153 case 16:
elessair 0:f269e3021894 154 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
elessair 0:f269e3021894 155 break;
elessair 0:f269e3021894 156 case 17:
elessair 0:f269e3021894 157 sConfig.Channel = ADC_CHANNEL_VREFINT;
elessair 0:f269e3021894 158 break;
elessair 0:f269e3021894 159 default:
elessair 0:f269e3021894 160 return 0;
elessair 0:f269e3021894 161 }
elessair 0:f269e3021894 162
elessair 0:f269e3021894 163 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
elessair 0:f269e3021894 164
elessair 0:f269e3021894 165 HAL_ADC_Start(&AdcHandle); // Start conversion
elessair 0:f269e3021894 166
elessair 0:f269e3021894 167 // Wait end of conversion and get value
elessair 0:f269e3021894 168 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
elessair 0:f269e3021894 169 return (HAL_ADC_GetValue(&AdcHandle));
elessair 0:f269e3021894 170 } else {
elessair 0:f269e3021894 171 return 0;
elessair 0:f269e3021894 172 }
elessair 0:f269e3021894 173 }
elessair 0:f269e3021894 174
elessair 0:f269e3021894 175 uint16_t analogin_read_u16(analogin_t *obj)
elessair 0:f269e3021894 176 {
elessair 0:f269e3021894 177 uint16_t value = adc_read(obj);
elessair 0:f269e3021894 178 // 12-bit to 16-bit conversion
elessair 0:f269e3021894 179 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
elessair 0:f269e3021894 180 return value;
elessair 0:f269e3021894 181 }
elessair 0:f269e3021894 182
elessair 0:f269e3021894 183 float analogin_read(analogin_t *obj)
elessair 0:f269e3021894 184 {
elessair 0:f269e3021894 185 uint16_t value = adc_read(obj);
elessair 0:f269e3021894 186 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
elessair 0:f269e3021894 187 }
elessair 0:f269e3021894 188
elessair 0:f269e3021894 189 #endif