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targets/hal/TARGET_STM/TARGET_STM32F4/analogin_api.c@636:b0d178e9fa10, 2016-07-07 (annotated)

Committer:
lzbpli
Date:
Thu Jul 07 06:48:59 2016 +0000
Revision:
636:b0d178e9fa10
Parent:
511:532f83b66a7f 
l053

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 340:28d1f895c6fe 1 /* mbed Microcontroller Library
mbed_official 340:28d1f895c6fe 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 340:28d1f895c6fe 3 * All rights reserved.
mbed_official 340:28d1f895c6fe 4 *
mbed_official 340:28d1f895c6fe 5 * Redistribution and use in source and binary forms, with or without
mbed_official 340:28d1f895c6fe 6 * modification, are permitted provided that the following conditions are met:
mbed_official 340:28d1f895c6fe 7 *
mbed_official 340:28d1f895c6fe 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 340:28d1f895c6fe 9 * this list of conditions and the following disclaimer.
mbed_official 340:28d1f895c6fe 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 340:28d1f895c6fe 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 340:28d1f895c6fe 12 * and/or other materials provided with the distribution.
mbed_official 340:28d1f895c6fe 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 340:28d1f895c6fe 14 * may be used to endorse or promote products derived from this software
mbed_official 340:28d1f895c6fe 15 * without specific prior written permission.
mbed_official 340:28d1f895c6fe 16 *
mbed_official 340:28d1f895c6fe 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 340:28d1f895c6fe 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 340:28d1f895c6fe 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 340:28d1f895c6fe 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 340:28d1f895c6fe 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 340:28d1f895c6fe 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 340:28d1f895c6fe 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 340:28d1f895c6fe 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 340:28d1f895c6fe 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 340:28d1f895c6fe 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 340:28d1f895c6fe 27 */
mbed_official 340:28d1f895c6fe 28 #include "mbed_assert.h"
mbed_official 340:28d1f895c6fe 29 #include "analogin_api.h"
mbed_official 340:28d1f895c6fe 30
mbed_official 340:28d1f895c6fe 31 #if DEVICE_ANALOGIN
mbed_official 340:28d1f895c6fe 32
mbed_official 340:28d1f895c6fe 33 #include "wait_api.h"
mbed_official 340:28d1f895c6fe 34 #include "cmsis.h"
mbed_official 340:28d1f895c6fe 35 #include "pinmap.h"
mbed_official 428:4ddf7f7eabbb 36 #include "PeripheralPins.h"
mbed_official 340:28d1f895c6fe 37
mbed_official 340:28d1f895c6fe 38 ADC_HandleTypeDef AdcHandle;
mbed_official 340:28d1f895c6fe 39
mbed_official 340:28d1f895c6fe 40 int adc_inited = 0;
mbed_official 340:28d1f895c6fe 41
mbed_official 340:28d1f895c6fe 42 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 340:28d1f895c6fe 43 {
mbed_official 340:28d1f895c6fe 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 340:28d1f895c6fe 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 340:28d1f895c6fe 46 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 340:28d1f895c6fe 47
mbed_official 511:532f83b66a7f 48 // Get the functions (adc channel) from the pin and assign it to the object
mbed_official 511:532f83b66a7f 49 uint32_t function = pinmap_function(pin, PinMap_ADC);
mbed_official 511:532f83b66a7f 50 MBED_ASSERT(function != (uint32_t)NC);
mbed_official 511:532f83b66a7f 51 obj->channel = STM_PIN_CHANNEL(function);
mbed_official 511:532f83b66a7f 52
mbed_official 340:28d1f895c6fe 53 // Configure GPIO
mbed_official 340:28d1f895c6fe 54 pinmap_pinout(pin, PinMap_ADC);
mbed_official 340:28d1f895c6fe 55
mbed_official 340:28d1f895c6fe 56 // Save pin number for the read function
mbed_official 340:28d1f895c6fe 57 obj->pin = pin;
mbed_official 340:28d1f895c6fe 58
mbed_official 340:28d1f895c6fe 59 // The ADC initialization is done once
mbed_official 340:28d1f895c6fe 60 if (adc_inited == 0) {
mbed_official 340:28d1f895c6fe 61 adc_inited = 1;
mbed_official 340:28d1f895c6fe 62
mbed_official 340:28d1f895c6fe 63 // Enable ADC clock
mbed_official 340:28d1f895c6fe 64 __ADC1_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 65
mbed_official 340:28d1f895c6fe 66 // Configure ADC
mbed_official 340:28d1f895c6fe 67 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 340:28d1f895c6fe 68 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
mbed_official 340:28d1f895c6fe 69 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
mbed_official 340:28d1f895c6fe 70 AdcHandle.Init.ScanConvMode = DISABLE;
mbed_official 340:28d1f895c6fe 71 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 340:28d1f895c6fe 72 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 340:28d1f895c6fe 73 AdcHandle.Init.NbrOfDiscConversion = 0;
mbed_official 340:28d1f895c6fe 74 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
mbed_official 340:28d1f895c6fe 75 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
mbed_official 340:28d1f895c6fe 76 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 340:28d1f895c6fe 77 AdcHandle.Init.NbrOfConversion = 1;
mbed_official 340:28d1f895c6fe 78 AdcHandle.Init.DMAContinuousRequests = DISABLE;
mbed_official 340:28d1f895c6fe 79 AdcHandle.Init.EOCSelection = DISABLE;
mbed_official 340:28d1f895c6fe 80 HAL_ADC_Init(&AdcHandle);
mbed_official 340:28d1f895c6fe 81 }
mbed_official 340:28d1f895c6fe 82 }
mbed_official 340:28d1f895c6fe 83
mbed_official 340:28d1f895c6fe 84 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 340:28d1f895c6fe 85 {
mbed_official 340:28d1f895c6fe 86 ADC_ChannelConfTypeDef sConfig;
mbed_official 340:28d1f895c6fe 87
mbed_official 340:28d1f895c6fe 88 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 340:28d1f895c6fe 89
mbed_official 340:28d1f895c6fe 90 // Configure ADC channel
mbed_official 340:28d1f895c6fe 91 sConfig.Rank = 1;
mbed_official 340:28d1f895c6fe 92 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
mbed_official 340:28d1f895c6fe 93 sConfig.Offset = 0;
mbed_official 340:28d1f895c6fe 94
mbed_official 511:532f83b66a7f 95 switch (obj->channel) {
mbed_official 511:532f83b66a7f 96 case 0:
mbed_official 340:28d1f895c6fe 97 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 340:28d1f895c6fe 98 break;
mbed_official 511:532f83b66a7f 99 case 1:
mbed_official 340:28d1f895c6fe 100 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 340:28d1f895c6fe 101 break;
mbed_official 511:532f83b66a7f 102 case 2:
mbed_official 340:28d1f895c6fe 103 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 340:28d1f895c6fe 104 break;
mbed_official 511:532f83b66a7f 105 case 3:
mbed_official 340:28d1f895c6fe 106 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 340:28d1f895c6fe 107 break;
mbed_official 511:532f83b66a7f 108 case 4:
mbed_official 340:28d1f895c6fe 109 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 340:28d1f895c6fe 110 break;
mbed_official 511:532f83b66a7f 111 case 5:
mbed_official 340:28d1f895c6fe 112 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 340:28d1f895c6fe 113 break;
mbed_official 511:532f83b66a7f 114 case 6:
mbed_official 340:28d1f895c6fe 115 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 340:28d1f895c6fe 116 break;
mbed_official 511:532f83b66a7f 117 case 7:
mbed_official 340:28d1f895c6fe 118 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 340:28d1f895c6fe 119 break;
mbed_official 511:532f83b66a7f 120 case 8:
mbed_official 340:28d1f895c6fe 121 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 340:28d1f895c6fe 122 break;
mbed_official 511:532f83b66a7f 123 case 9:
mbed_official 340:28d1f895c6fe 124 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 340:28d1f895c6fe 125 break;
mbed_official 511:532f83b66a7f 126 case 10:
mbed_official 340:28d1f895c6fe 127 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 340:28d1f895c6fe 128 break;
mbed_official 511:532f83b66a7f 129 case 11:
mbed_official 340:28d1f895c6fe 130 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 340:28d1f895c6fe 131 break;
mbed_official 511:532f83b66a7f 132 case 12:
mbed_official 340:28d1f895c6fe 133 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 340:28d1f895c6fe 134 break;
mbed_official 511:532f83b66a7f 135 case 13:
mbed_official 340:28d1f895c6fe 136 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 340:28d1f895c6fe 137 break;
mbed_official 511:532f83b66a7f 138 case 14:
mbed_official 340:28d1f895c6fe 139 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 340:28d1f895c6fe 140 break;
mbed_official 511:532f83b66a7f 141 case 15:
mbed_official 340:28d1f895c6fe 142 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 340:28d1f895c6fe 143 break;
mbed_official 340:28d1f895c6fe 144 default:
mbed_official 340:28d1f895c6fe 145 return 0;
mbed_official 340:28d1f895c6fe 146 }
mbed_official 340:28d1f895c6fe 147
mbed_official 340:28d1f895c6fe 148 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 340:28d1f895c6fe 149
mbed_official 340:28d1f895c6fe 150 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 340:28d1f895c6fe 151
mbed_official 340:28d1f895c6fe 152 // Wait end of conversion and get value
mbed_official 340:28d1f895c6fe 153 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 340:28d1f895c6fe 154 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 340:28d1f895c6fe 155 } else {
mbed_official 340:28d1f895c6fe 156 return 0;
mbed_official 340:28d1f895c6fe 157 }
mbed_official 340:28d1f895c6fe 158 }
mbed_official 340:28d1f895c6fe 159
mbed_official 340:28d1f895c6fe 160 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 340:28d1f895c6fe 161 {
mbed_official 340:28d1f895c6fe 162 uint16_t value = adc_read(obj);
mbed_official 340:28d1f895c6fe 163 // 12-bit to 16-bit conversion
mbed_official 340:28d1f895c6fe 164 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 340:28d1f895c6fe 165 return value;
mbed_official 340:28d1f895c6fe 166 }
mbed_official 340:28d1f895c6fe 167
mbed_official 340:28d1f895c6fe 168 float analogin_read(analogin_t *obj)
mbed_official 340:28d1f895c6fe 169 {
mbed_official 340:28d1f895c6fe 170 uint16_t value = adc_read(obj);
mbed_official 340:28d1f895c6fe 171 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 340:28d1f895c6fe 172 }
mbed_official 340:28d1f895c6fe 173
mbed_official 340:28d1f895c6fe 174 #endif