Amit Gandhi / mbed-dev

test

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L4/analogin_api.c@149:156823d33999, 2016-10-28 (annotated)

Committer:
<>
Date:
Fri Oct 28 11:17:30 2016 +0100
Revision:
149:156823d33999
Child:
150:02e0a0aed4ec
This updates the lib to the mbed lib v128



NOTE: This release includes a restructuring of the file and directory locations and thus some

include paths in your code may need updating accordingly.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2016, STMicroelectronics
<> 149:156823d33999 3 * All rights reserved.
<> 149:156823d33999 4 *
<> 149:156823d33999 5 * Redistribution and use in source and binary forms, with or without
<> 149:156823d33999 6 * modification, are permitted provided that the following conditions are met:
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * 1. Redistributions of source code must retain the above copyright notice,
<> 149:156823d33999 9 * this list of conditions and the following disclaimer.
<> 149:156823d33999 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 149:156823d33999 11 * this list of conditions and the following disclaimer in the documentation
<> 149:156823d33999 12 * and/or other materials provided with the distribution.
<> 149:156823d33999 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 149:156823d33999 14 * may be used to endorse or promote products derived from this software
<> 149:156823d33999 15 * without specific prior written permission.
<> 149:156823d33999 16 *
<> 149:156823d33999 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 149:156823d33999 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 149:156823d33999 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 149:156823d33999 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 149:156823d33999 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 149:156823d33999 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 149:156823d33999 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 149:156823d33999 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 149:156823d33999 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 149:156823d33999 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 149:156823d33999 27 */
<> 149:156823d33999 28 #include "mbed_assert.h"
<> 149:156823d33999 29 #include "analogin_api.h"
<> 149:156823d33999 30
<> 149:156823d33999 31 #if DEVICE_ANALOGIN
<> 149:156823d33999 32
<> 149:156823d33999 33 #include "wait_api.h"
<> 149:156823d33999 34 #include "cmsis.h"
<> 149:156823d33999 35 #include "pinmap.h"
<> 149:156823d33999 36 #include "mbed_error.h"
<> 149:156823d33999 37 #include "PeripheralPins.h"
<> 149:156823d33999 38
<> 149:156823d33999 39 ADC_HandleTypeDef AdcHandle;
<> 149:156823d33999 40
<> 149:156823d33999 41 int adc_inited = 0;
<> 149:156823d33999 42
<> 149:156823d33999 43 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 44 {
<> 149:156823d33999 45 // Get the peripheral name from the pin and assign it to the object
<> 149:156823d33999 46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 149:156823d33999 47 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 149:156823d33999 48
<> 149:156823d33999 49 // Get the pin function and assign the used channel to the object
<> 149:156823d33999 50 uint32_t function = pinmap_function(pin, PinMap_ADC);
<> 149:156823d33999 51 MBED_ASSERT(function != (uint32_t)NC);
<> 149:156823d33999 52 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 53
<> 149:156823d33999 54 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat)
<> 149:156823d33999 55 if ((obj->channel != 0) && (obj->channel != 17) && (obj->channel != 18)) {
<> 149:156823d33999 56 pinmap_pinout(pin, PinMap_ADC);
<> 149:156823d33999 57 }
<> 149:156823d33999 58
<> 149:156823d33999 59 // Save pin number for the read function
<> 149:156823d33999 60 obj->pin = pin;
<> 149:156823d33999 61
<> 149:156823d33999 62 // The ADC initialization is done once
<> 149:156823d33999 63 if (adc_inited == 0) {
<> 149:156823d33999 64 adc_inited = 1;
<> 149:156823d33999 65
<> 149:156823d33999 66 // Enable ADC clock
<> 149:156823d33999 67 __HAL_RCC_ADC_CLK_ENABLE();
<> 149:156823d33999 68 __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_SYSCLK);
<> 149:156823d33999 69
<> 149:156823d33999 70 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 71
<> 149:156823d33999 72 // Configure ADC
<> 149:156823d33999 73 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2; // Asynchronous clock mode, input ADC clock
<> 149:156823d33999 74 AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
<> 149:156823d33999 75 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
<> 149:156823d33999 76 AdcHandle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
<> 149:156823d33999 77 AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV; // On STM32L1xx ADC, overrun detection is enabled only if EOC selection is set to each conversion (or transfer by DMA enabled, this is not the case in this example).
<> 149:156823d33999 78 AdcHandle.Init.LowPowerAutoWait = DISABLE;
<> 149:156823d33999 79 AdcHandle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
<> 149:156823d33999 80 AdcHandle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 81 AdcHandle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 82 AdcHandle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 83 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START; // Software start to trig the 1st conversion manually, without external event
<> 149:156823d33999 84 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
<> 149:156823d33999 85 AdcHandle.Init.DMAContinuousRequests = DISABLE;
<> 149:156823d33999 86 AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; // DR register is overwritten with the last conversion result in case of overrun
<> 149:156823d33999 87 AdcHandle.Init.OversamplingMode = DISABLE; // No oversampling
<> 149:156823d33999 88
<> 149:156823d33999 89 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
<> 149:156823d33999 90 error("Cannot initialize ADC\n");
<> 149:156823d33999 91 }
<> 149:156823d33999 92 }
<> 149:156823d33999 93 }
<> 149:156823d33999 94
<> 149:156823d33999 95 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 96 {
<> 149:156823d33999 97 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 98
<> 149:156823d33999 99 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 100
<> 149:156823d33999 101 // Configure ADC channel
<> 149:156823d33999 102 switch (obj->channel) {
<> 149:156823d33999 103 case 0:
<> 149:156823d33999 104 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 105 break;
<> 149:156823d33999 106 case 1:
<> 149:156823d33999 107 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 108 break;
<> 149:156823d33999 109 case 2:
<> 149:156823d33999 110 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 111 break;
<> 149:156823d33999 112 case 3:
<> 149:156823d33999 113 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 114 break;
<> 149:156823d33999 115 case 4:
<> 149:156823d33999 116 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 117 break;
<> 149:156823d33999 118 case 5:
<> 149:156823d33999 119 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 120 break;
<> 149:156823d33999 121 case 6:
<> 149:156823d33999 122 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 123 break;
<> 149:156823d33999 124 case 7:
<> 149:156823d33999 125 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 126 break;
<> 149:156823d33999 127 case 8:
<> 149:156823d33999 128 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 129 break;
<> 149:156823d33999 130 case 9:
<> 149:156823d33999 131 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 132 break;
<> 149:156823d33999 133 case 10:
<> 149:156823d33999 134 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 135 break;
<> 149:156823d33999 136 case 11:
<> 149:156823d33999 137 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 138 break;
<> 149:156823d33999 139 case 12:
<> 149:156823d33999 140 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 141 break;
<> 149:156823d33999 142 case 13:
<> 149:156823d33999 143 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 144 break;
<> 149:156823d33999 145 case 14:
<> 149:156823d33999 146 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 147 break;
<> 149:156823d33999 148 case 15:
<> 149:156823d33999 149 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 150 break;
<> 149:156823d33999 151 case 16:
<> 149:156823d33999 152 sConfig.Channel = ADC_CHANNEL_16;
<> 149:156823d33999 153 break;
<> 149:156823d33999 154 case 17:
<> 149:156823d33999 155 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 156 break;
<> 149:156823d33999 157 case 18:
<> 149:156823d33999 158 sConfig.Channel = ADC_CHANNEL_VBAT;
<> 149:156823d33999 159 break;
<> 149:156823d33999 160 default:
<> 149:156823d33999 161 return 0;
<> 149:156823d33999 162 }
<> 149:156823d33999 163
<> 149:156823d33999 164 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 165 sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5;
<> 149:156823d33999 166 sConfig.SingleDiff = ADC_SINGLE_ENDED;
<> 149:156823d33999 167 sConfig.OffsetNumber = ADC_OFFSET_NONE;
<> 149:156823d33999 168 sConfig.Offset = 0;
<> 149:156823d33999 169
<> 149:156823d33999 170 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
<> 149:156823d33999 171
<> 149:156823d33999 172 HAL_ADC_Start(&AdcHandle); // Start conversion
<> 149:156823d33999 173
<> 149:156823d33999 174 // Wait end of conversion and get value
<> 149:156823d33999 175 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
<> 149:156823d33999 176 return (HAL_ADC_GetValue(&AdcHandle));
<> 149:156823d33999 177 } else {
<> 149:156823d33999 178 return 0;
<> 149:156823d33999 179 }
<> 149:156823d33999 180 }
<> 149:156823d33999 181
<> 149:156823d33999 182 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 183 {
<> 149:156823d33999 184 uint16_t value = adc_read(obj);
<> 149:156823d33999 185 // 12-bit to 16-bit conversion
<> 149:156823d33999 186 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 187 return value;
<> 149:156823d33999 188 }
<> 149:156823d33999 189
<> 149:156823d33999 190 float analogin_read(analogin_t *obj)
<> 149:156823d33999 191 {
<> 149:156823d33999 192 uint16_t value = adc_read(obj);
<> 149:156823d33999 193 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 194 }
<> 149:156823d33999 195
<> 149:156823d33999 196 #endif