Gordon Craig / mbed-dev

Forked.

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L4/analogin_api.c@150:02e0a0aed4ec, 2016-11-08 (annotated)

Committer:
<>
Date:
Tue Nov 08 17:45:16 2016 +0000
Revision:
150:02e0a0aed4ec
Parent:
149:156823d33999
Child:
160:d5399cc887bb
This updates the lib to the mbed lib v129

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
<> 150:02e0a0aed4ec 54 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
<> 150:02e0a0aed4ec 55 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
<> 150:02e0a0aed4ec 56 if (pin < 0xF0) {
<> 149:156823d33999 57 pinmap_pinout(pin, PinMap_ADC);
<> 149:156823d33999 58 }
<> 149:156823d33999 59
<> 149:156823d33999 60 // Save pin number for the read function
<> 149:156823d33999 61 obj->pin = pin;
<> 149:156823d33999 62
<> 149:156823d33999 63 // The ADC initialization is done once
<> 149:156823d33999 64 if (adc_inited == 0) {
<> 149:156823d33999 65 adc_inited = 1;
<> 149:156823d33999 66
<> 149:156823d33999 67 // Enable ADC clock
<> 149:156823d33999 68 __HAL_RCC_ADC_CLK_ENABLE();
<> 149:156823d33999 69 __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_SYSCLK);
<> 149:156823d33999 70
<> 149:156823d33999 71 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 72
<> 149:156823d33999 73 // Configure ADC
<> 149:156823d33999 74 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2; // Asynchronous clock mode, input ADC clock
<> 149:156823d33999 75 AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
<> 149:156823d33999 76 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
<> 149:156823d33999 77 AdcHandle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
<> 149:156823d33999 78 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 79 AdcHandle.Init.LowPowerAutoWait = DISABLE;
<> 149:156823d33999 80 AdcHandle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
<> 149:156823d33999 81 AdcHandle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 82 AdcHandle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 83 AdcHandle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
<> 149:156823d33999 84 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START; // Software start to trig the 1st conversion manually, without external event
<> 149:156823d33999 85 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
<> 149:156823d33999 86 AdcHandle.Init.DMAContinuousRequests = DISABLE;
<> 149:156823d33999 87 AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; // DR register is overwritten with the last conversion result in case of overrun
<> 149:156823d33999 88 AdcHandle.Init.OversamplingMode = DISABLE; // No oversampling
<> 149:156823d33999 89
<> 149:156823d33999 90 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
<> 149:156823d33999 91 error("Cannot initialize ADC\n");
<> 149:156823d33999 92 }
<> 149:156823d33999 93 }
<> 149:156823d33999 94 }
<> 149:156823d33999 95
<> 149:156823d33999 96 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 97 {
<> 149:156823d33999 98 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 99
<> 149:156823d33999 100 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 101
<> 149:156823d33999 102 // Configure ADC channel
<> 149:156823d33999 103 switch (obj->channel) {
<> 149:156823d33999 104 case 0:
<> 149:156823d33999 105 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 106 break;
<> 149:156823d33999 107 case 1:
<> 149:156823d33999 108 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 109 break;
<> 149:156823d33999 110 case 2:
<> 149:156823d33999 111 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 112 break;
<> 149:156823d33999 113 case 3:
<> 149:156823d33999 114 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 115 break;
<> 149:156823d33999 116 case 4:
<> 149:156823d33999 117 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 118 break;
<> 149:156823d33999 119 case 5:
<> 149:156823d33999 120 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 121 break;
<> 149:156823d33999 122 case 6:
<> 149:156823d33999 123 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 124 break;
<> 149:156823d33999 125 case 7:
<> 149:156823d33999 126 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 127 break;
<> 149:156823d33999 128 case 8:
<> 149:156823d33999 129 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 130 break;
<> 149:156823d33999 131 case 9:
<> 149:156823d33999 132 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 133 break;
<> 149:156823d33999 134 case 10:
<> 149:156823d33999 135 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 136 break;
<> 149:156823d33999 137 case 11:
<> 149:156823d33999 138 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 139 break;
<> 149:156823d33999 140 case 12:
<> 149:156823d33999 141 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 142 break;
<> 149:156823d33999 143 case 13:
<> 149:156823d33999 144 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 145 break;
<> 149:156823d33999 146 case 14:
<> 149:156823d33999 147 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 148 break;
<> 149:156823d33999 149 case 15:
<> 149:156823d33999 150 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 151 break;
<> 149:156823d33999 152 case 16:
<> 149:156823d33999 153 sConfig.Channel = ADC_CHANNEL_16;
<> 149:156823d33999 154 break;
<> 149:156823d33999 155 case 17:
<> 149:156823d33999 156 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 157 break;
<> 149:156823d33999 158 case 18:
<> 149:156823d33999 159 sConfig.Channel = ADC_CHANNEL_VBAT;
<> 149:156823d33999 160 break;
<> 149:156823d33999 161 default:
<> 149:156823d33999 162 return 0;
<> 149:156823d33999 163 }
<> 149:156823d33999 164
<> 149:156823d33999 165 sConfig.Rank = ADC_REGULAR_RANK_1;
<> 149:156823d33999 166 sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5;
<> 149:156823d33999 167 sConfig.SingleDiff = ADC_SINGLE_ENDED;
<> 149:156823d33999 168 sConfig.OffsetNumber = ADC_OFFSET_NONE;
<> 149:156823d33999 169 sConfig.Offset = 0;
<> 149:156823d33999 170
<> 149:156823d33999 171 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
<> 149:156823d33999 172
<> 149:156823d33999 173 HAL_ADC_Start(&AdcHandle); // Start conversion
<> 149:156823d33999 174
<> 149:156823d33999 175 // Wait end of conversion and get value
<> 149:156823d33999 176 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
<> 149:156823d33999 177 return (HAL_ADC_GetValue(&AdcHandle));
<> 149:156823d33999 178 } else {
<> 149:156823d33999 179 return 0;
<> 149:156823d33999 180 }
<> 149:156823d33999 181 }
<> 149:156823d33999 182
<> 149:156823d33999 183 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 184 {
<> 149:156823d33999 185 uint16_t value = adc_read(obj);
<> 149:156823d33999 186 // 12-bit to 16-bit conversion
<> 149:156823d33999 187 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 188 return value;
<> 149:156823d33999 189 }
<> 149:156823d33999 190
<> 149:156823d33999 191 float analogin_read(analogin_t *obj)
<> 149:156823d33999 192 {
<> 149:156823d33999 193 uint16_t value = adc_read(obj);
<> 149:156823d33999 194 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 195 }
<> 149:156823d33999 196
<> 149:156823d33999 197 #endif