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targets/hal/TARGET_STM/TARGET_STM32F4/analogin_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
23:ee8ca7052b3c
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2014, STMicroelectronics
bogdanm 0:9b334a45a8ff 3 * All rights reserved.
bogdanm 0:9b334a45a8ff 4 *
bogdanm 0:9b334a45a8ff 5 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 6 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 9 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 11 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 12 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 14 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 15 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 16 *
bogdanm 0:9b334a45a8ff 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 27 */
bogdanm 0:9b334a45a8ff 28 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 29 #include "analogin_api.h"
bogdanm 0:9b334a45a8ff 30
bogdanm 0:9b334a45a8ff 31 #if DEVICE_ANALOGIN
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #include "wait_api.h"
bogdanm 0:9b334a45a8ff 34 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 35 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 36 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 ADC_HandleTypeDef AdcHandle;
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 int adc_inited = 0;
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 void analogin_init(analogin_t *obj, PinName pin)
bogdanm 0:9b334a45a8ff 43 {
bogdanm 0:9b334a45a8ff 44 // Get the peripheral name from the pin and assign it to the object
bogdanm 0:9b334a45a8ff 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 46 MBED_ASSERT(obj->adc != (ADCName)NC);
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 // Get the functions (adc channel) from the pin and assign it to the object
bogdanm 0:9b334a45a8ff 49 uint32_t function = pinmap_function(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 50 MBED_ASSERT(function != (uint32_t)NC);
bogdanm 0:9b334a45a8ff 51 obj->channel = STM_PIN_CHANNEL(function);
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 // Configure GPIO
bogdanm 0:9b334a45a8ff 54 pinmap_pinout(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 // Save pin number for the read function
bogdanm 0:9b334a45a8ff 57 obj->pin = pin;
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 // The ADC initialization is done once
bogdanm 0:9b334a45a8ff 60 if (adc_inited == 0) {
bogdanm 0:9b334a45a8ff 61 adc_inited = 1;
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 // Enable ADC clock
bogdanm 0:9b334a45a8ff 64 __ADC1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 65
bogdanm 0:9b334a45a8ff 66 // Configure ADC
bogdanm 0:9b334a45a8ff 67 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
bogdanm 0:9b334a45a8ff 68 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
bogdanm 0:9b334a45a8ff 69 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
bogdanm 0:9b334a45a8ff 70 AdcHandle.Init.ScanConvMode = DISABLE;
bogdanm 0:9b334a45a8ff 71 AdcHandle.Init.ContinuousConvMode = DISABLE;
bogdanm 0:9b334a45a8ff 72 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
bogdanm 0:9b334a45a8ff 73 AdcHandle.Init.NbrOfDiscConversion = 0;
bogdanm 0:9b334a45a8ff 74 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
bogdanm 0:9b334a45a8ff 75 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
bogdanm 0:9b334a45a8ff 76 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
bogdanm 0:9b334a45a8ff 77 AdcHandle.Init.NbrOfConversion = 1;
bogdanm 0:9b334a45a8ff 78 AdcHandle.Init.DMAContinuousRequests = DISABLE;
bogdanm 0:9b334a45a8ff 79 AdcHandle.Init.EOCSelection = DISABLE;
bogdanm 0:9b334a45a8ff 80 HAL_ADC_Init(&AdcHandle);
bogdanm 0:9b334a45a8ff 81 }
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 static inline uint16_t adc_read(analogin_t *obj)
bogdanm 0:9b334a45a8ff 85 {
bogdanm 0:9b334a45a8ff 86 ADC_ChannelConfTypeDef sConfig;
bogdanm 0:9b334a45a8ff 87
bogdanm 0:9b334a45a8ff 88 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
bogdanm 0:9b334a45a8ff 89
bogdanm 0:9b334a45a8ff 90 // Configure ADC channel
bogdanm 0:9b334a45a8ff 91 sConfig.Rank = 1;
bogdanm 0:9b334a45a8ff 92 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
bogdanm 0:9b334a45a8ff 93 sConfig.Offset = 0;
bogdanm 0:9b334a45a8ff 94
bogdanm 0:9b334a45a8ff 95 switch (obj->channel) {
bogdanm 0:9b334a45a8ff 96 case 0:
bogdanm 0:9b334a45a8ff 97 sConfig.Channel = ADC_CHANNEL_0;
bogdanm 0:9b334a45a8ff 98 break;
bogdanm 0:9b334a45a8ff 99 case 1:
bogdanm 0:9b334a45a8ff 100 sConfig.Channel = ADC_CHANNEL_1;
bogdanm 0:9b334a45a8ff 101 break;
bogdanm 0:9b334a45a8ff 102 case 2:
bogdanm 0:9b334a45a8ff 103 sConfig.Channel = ADC_CHANNEL_2;
bogdanm 0:9b334a45a8ff 104 break;
bogdanm 0:9b334a45a8ff 105 case 3:
bogdanm 0:9b334a45a8ff 106 sConfig.Channel = ADC_CHANNEL_3;
bogdanm 0:9b334a45a8ff 107 break;
bogdanm 0:9b334a45a8ff 108 case 4:
bogdanm 0:9b334a45a8ff 109 sConfig.Channel = ADC_CHANNEL_4;
bogdanm 0:9b334a45a8ff 110 break;
bogdanm 0:9b334a45a8ff 111 case 5:
bogdanm 0:9b334a45a8ff 112 sConfig.Channel = ADC_CHANNEL_5;
bogdanm 0:9b334a45a8ff 113 break;
bogdanm 0:9b334a45a8ff 114 case 6:
bogdanm 0:9b334a45a8ff 115 sConfig.Channel = ADC_CHANNEL_6;
bogdanm 0:9b334a45a8ff 116 break;
bogdanm 0:9b334a45a8ff 117 case 7:
bogdanm 0:9b334a45a8ff 118 sConfig.Channel = ADC_CHANNEL_7;
bogdanm 0:9b334a45a8ff 119 break;
bogdanm 0:9b334a45a8ff 120 case 8:
bogdanm 0:9b334a45a8ff 121 sConfig.Channel = ADC_CHANNEL_8;
bogdanm 0:9b334a45a8ff 122 break;
bogdanm 0:9b334a45a8ff 123 case 9:
bogdanm 0:9b334a45a8ff 124 sConfig.Channel = ADC_CHANNEL_9;
bogdanm 0:9b334a45a8ff 125 break;
bogdanm 0:9b334a45a8ff 126 case 10:
bogdanm 0:9b334a45a8ff 127 sConfig.Channel = ADC_CHANNEL_10;
bogdanm 0:9b334a45a8ff 128 break;
bogdanm 0:9b334a45a8ff 129 case 11:
bogdanm 0:9b334a45a8ff 130 sConfig.Channel = ADC_CHANNEL_11;
bogdanm 0:9b334a45a8ff 131 break;
bogdanm 0:9b334a45a8ff 132 case 12:
bogdanm 0:9b334a45a8ff 133 sConfig.Channel = ADC_CHANNEL_12;
bogdanm 0:9b334a45a8ff 134 break;
bogdanm 0:9b334a45a8ff 135 case 13:
bogdanm 0:9b334a45a8ff 136 sConfig.Channel = ADC_CHANNEL_13;
bogdanm 0:9b334a45a8ff 137 break;
bogdanm 0:9b334a45a8ff 138 case 14:
bogdanm 0:9b334a45a8ff 139 sConfig.Channel = ADC_CHANNEL_14;
bogdanm 0:9b334a45a8ff 140 break;
bogdanm 0:9b334a45a8ff 141 case 15:
bogdanm 0:9b334a45a8ff 142 sConfig.Channel = ADC_CHANNEL_15;
bogdanm 0:9b334a45a8ff 143 break;
bogdanm 0:9b334a45a8ff 144 default:
bogdanm 0:9b334a45a8ff 145 return 0;
bogdanm 0:9b334a45a8ff 146 }
bogdanm 0:9b334a45a8ff 147
bogdanm 0:9b334a45a8ff 148 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
bogdanm 0:9b334a45a8ff 149
bogdanm 0:9b334a45a8ff 150 HAL_ADC_Start(&AdcHandle); // Start conversion
bogdanm 0:9b334a45a8ff 151
bogdanm 0:9b334a45a8ff 152 // Wait end of conversion and get value
bogdanm 0:9b334a45a8ff 153 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
bogdanm 0:9b334a45a8ff 154 return (HAL_ADC_GetValue(&AdcHandle));
bogdanm 0:9b334a45a8ff 155 } else {
bogdanm 0:9b334a45a8ff 156 return 0;
bogdanm 0:9b334a45a8ff 157 }
bogdanm 0:9b334a45a8ff 158 }
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 uint16_t analogin_read_u16(analogin_t *obj)
bogdanm 0:9b334a45a8ff 161 {
bogdanm 0:9b334a45a8ff 162 uint16_t value = adc_read(obj);
bogdanm 0:9b334a45a8ff 163 // 12-bit to 16-bit conversion
bogdanm 0:9b334a45a8ff 164 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
bogdanm 0:9b334a45a8ff 165 return value;
bogdanm 0:9b334a45a8ff 166 }
bogdanm 0:9b334a45a8ff 167
bogdanm 0:9b334a45a8ff 168 float analogin_read(analogin_t *obj)
bogdanm 0:9b334a45a8ff 169 {
bogdanm 0:9b334a45a8ff 170 uint16_t value = adc_read(obj);
bogdanm 0:9b334a45a8ff 171 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
bogdanm 0:9b334a45a8ff 172 }
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 #endif