teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed by teralytic

targets/hal/TARGET_STM/TARGET_STM32F0/analogin_api.c@148:4802eb17e82b, 2016-10-17 (annotated)

Committer:
rodriguise
Date:
Mon Oct 17 18:47:01 2016 +0000
Revision:
148:4802eb17e82b
Parent:
144:ef7eb2e8f9f7 
backup

Who changed what in which revision?

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<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015, STMicroelectronics
<> 144:ef7eb2e8f9f7 3 * All rights reserved.
<> 144:ef7eb2e8f9f7 4 *
<> 144:ef7eb2e8f9f7 5 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 6 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 9 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 11 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 12 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 14 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 15 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 16 *
<> 144:ef7eb2e8f9f7 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 27 */
<> 144:ef7eb2e8f9f7 28 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 29 #include "analogin_api.h"
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 #if DEVICE_ANALOGIN
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #include "wait_api.h"
<> 144:ef7eb2e8f9f7 34 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 35 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 36 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 37 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 ADC_HandleTypeDef AdcHandle;
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 int adc_inited = 0;
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 void analogin_init(analogin_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 44 // Get the peripheral name from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 46 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 144:ef7eb2e8f9f7 47
<> 144:ef7eb2e8f9f7 48 // Get the functions (adc channel) from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 49 uint32_t function = pinmap_function(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 50 MBED_ASSERT(function != (uint32_t)NC);
<> 144:ef7eb2e8f9f7 51 obj->channel = STM_PIN_CHANNEL(function);
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 // Configure GPIO
<> 144:ef7eb2e8f9f7 54 pinmap_pinout(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 // Save pin number for the read function
<> 144:ef7eb2e8f9f7 57 obj->pin = pin;
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 // The ADC initialization is done once
<> 144:ef7eb2e8f9f7 60 if (adc_inited == 0) {
<> 144:ef7eb2e8f9f7 61 adc_inited = 1;
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 // Enable ADC clock
<> 144:ef7eb2e8f9f7 64 __ADC1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 // Configure ADC
<> 144:ef7eb2e8f9f7 67 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 144:ef7eb2e8f9f7 68 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
<> 144:ef7eb2e8f9f7 69 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
<> 144:ef7eb2e8f9f7 70 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
<> 144:ef7eb2e8f9f7 71 AdcHandle.Init.ScanConvMode = DISABLE;
<> 144:ef7eb2e8f9f7 72 AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
<> 144:ef7eb2e8f9f7 73 AdcHandle.Init.LowPowerAutoWait = DISABLE;
<> 144:ef7eb2e8f9f7 74 AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
<> 144:ef7eb2e8f9f7 75 AdcHandle.Init.ContinuousConvMode = DISABLE;
<> 144:ef7eb2e8f9f7 76 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
<> 144:ef7eb2e8f9f7 77 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
<> 144:ef7eb2e8f9f7 78 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
<> 144:ef7eb2e8f9f7 79 AdcHandle.Init.DMAContinuousRequests = DISABLE;
<> 144:ef7eb2e8f9f7 80 AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN;
<> 144:ef7eb2e8f9f7 81 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
<> 144:ef7eb2e8f9f7 82 error("Cannot initialize ADC");
<> 144:ef7eb2e8f9f7 83 }
<> 144:ef7eb2e8f9f7 84 // Run the ADC calibration
<> 144:ef7eb2e8f9f7 85 if (HAL_ADCEx_Calibration_Start(&AdcHandle) != HAL_OK) {
<> 144:ef7eb2e8f9f7 86 error("Cannot Start ADC_Calibration");
<> 144:ef7eb2e8f9f7 87 }
<> 144:ef7eb2e8f9f7 88 }
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 static inline uint16_t adc_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 92 ADC_ChannelConfTypeDef sConfig;
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 144:ef7eb2e8f9f7 95
<> 144:ef7eb2e8f9f7 96 // Configure ADC channel
<> 144:ef7eb2e8f9f7 97 sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
<> 144:ef7eb2e8f9f7 98 #if defined (TARGET_STM32F091RC)
<> 144:ef7eb2e8f9f7 99 sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
<> 144:ef7eb2e8f9f7 100 #else
<> 144:ef7eb2e8f9f7 101 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
<> 144:ef7eb2e8f9f7 102 #endif
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 switch (obj->channel) {
<> 144:ef7eb2e8f9f7 105 case 0:
<> 144:ef7eb2e8f9f7 106 sConfig.Channel = ADC_CHANNEL_0;
<> 144:ef7eb2e8f9f7 107 break;
<> 144:ef7eb2e8f9f7 108 case 1:
<> 144:ef7eb2e8f9f7 109 sConfig.Channel = ADC_CHANNEL_1;
<> 144:ef7eb2e8f9f7 110 break;
<> 144:ef7eb2e8f9f7 111 case 2:
<> 144:ef7eb2e8f9f7 112 sConfig.Channel = ADC_CHANNEL_2;
<> 144:ef7eb2e8f9f7 113 break;
<> 144:ef7eb2e8f9f7 114 case 3:
<> 144:ef7eb2e8f9f7 115 sConfig.Channel = ADC_CHANNEL_3;
<> 144:ef7eb2e8f9f7 116 break;
<> 144:ef7eb2e8f9f7 117 case 4:
<> 144:ef7eb2e8f9f7 118 sConfig.Channel = ADC_CHANNEL_4;
<> 144:ef7eb2e8f9f7 119 break;
<> 144:ef7eb2e8f9f7 120 case 5:
<> 144:ef7eb2e8f9f7 121 sConfig.Channel = ADC_CHANNEL_5;
<> 144:ef7eb2e8f9f7 122 break;
<> 144:ef7eb2e8f9f7 123 case 6:
<> 144:ef7eb2e8f9f7 124 sConfig.Channel = ADC_CHANNEL_6;
<> 144:ef7eb2e8f9f7 125 break;
<> 144:ef7eb2e8f9f7 126 case 7:
<> 144:ef7eb2e8f9f7 127 sConfig.Channel = ADC_CHANNEL_7;
<> 144:ef7eb2e8f9f7 128 break;
<> 144:ef7eb2e8f9f7 129 case 8:
<> 144:ef7eb2e8f9f7 130 sConfig.Channel = ADC_CHANNEL_8;
<> 144:ef7eb2e8f9f7 131 break;
<> 144:ef7eb2e8f9f7 132 case 9:
<> 144:ef7eb2e8f9f7 133 sConfig.Channel = ADC_CHANNEL_9;
<> 144:ef7eb2e8f9f7 134 break;
<> 144:ef7eb2e8f9f7 135 case 10:
<> 144:ef7eb2e8f9f7 136 sConfig.Channel = ADC_CHANNEL_10;
<> 144:ef7eb2e8f9f7 137 break;
<> 144:ef7eb2e8f9f7 138 case 11:
<> 144:ef7eb2e8f9f7 139 sConfig.Channel = ADC_CHANNEL_11;
<> 144:ef7eb2e8f9f7 140 break;
<> 144:ef7eb2e8f9f7 141 case 12:
<> 144:ef7eb2e8f9f7 142 sConfig.Channel = ADC_CHANNEL_12;
<> 144:ef7eb2e8f9f7 143 break;
<> 144:ef7eb2e8f9f7 144 case 13:
<> 144:ef7eb2e8f9f7 145 sConfig.Channel = ADC_CHANNEL_13;
<> 144:ef7eb2e8f9f7 146 break;
<> 144:ef7eb2e8f9f7 147 case 14:
<> 144:ef7eb2e8f9f7 148 sConfig.Channel = ADC_CHANNEL_14;
<> 144:ef7eb2e8f9f7 149 break;
<> 144:ef7eb2e8f9f7 150 case 15:
<> 144:ef7eb2e8f9f7 151 sConfig.Channel = ADC_CHANNEL_15;
<> 144:ef7eb2e8f9f7 152 break;
<> 144:ef7eb2e8f9f7 153 default:
<> 144:ef7eb2e8f9f7 154 return 0;
<> 144:ef7eb2e8f9f7 155 }
<> 144:ef7eb2e8f9f7 156
<> 144:ef7eb2e8f9f7 157 // Clear all channels as it is not done in HAL_ADC_ConfigChannel()
<> 144:ef7eb2e8f9f7 158 AdcHandle.Instance->CHSELR = 0;
<> 144:ef7eb2e8f9f7 159
<> 144:ef7eb2e8f9f7 160 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
<> 144:ef7eb2e8f9f7 161
<> 144:ef7eb2e8f9f7 162 HAL_ADC_Start(&AdcHandle); // Start conversion
<> 144:ef7eb2e8f9f7 163
<> 144:ef7eb2e8f9f7 164 // Wait end of conversion and get value
<> 144:ef7eb2e8f9f7 165 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
<> 144:ef7eb2e8f9f7 166 return (HAL_ADC_GetValue(&AdcHandle));
<> 144:ef7eb2e8f9f7 167 } else {
<> 144:ef7eb2e8f9f7 168 return 0;
<> 144:ef7eb2e8f9f7 169 }
<> 144:ef7eb2e8f9f7 170 }
<> 144:ef7eb2e8f9f7 171
<> 144:ef7eb2e8f9f7 172 uint16_t analogin_read_u16(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 173 uint16_t value = adc_read(obj);
<> 144:ef7eb2e8f9f7 174 // 12-bit to 16-bit conversion
<> 144:ef7eb2e8f9f7 175 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 144:ef7eb2e8f9f7 176 return value;
<> 144:ef7eb2e8f9f7 177 }
<> 144:ef7eb2e8f9f7 178
<> 144:ef7eb2e8f9f7 179 float analogin_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 180 uint16_t value = adc_read(obj);
<> 144:ef7eb2e8f9f7 181 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 144:ef7eb2e8f9f7 182 }
<> 144:ef7eb2e8f9f7 183
<> 144:ef7eb2e8f9f7 184 #endif