Elijah Stanger-Jones / mbed-dev-f303

test

targets/TARGET_STM/TARGET_STM32L0/analogin_api.c@2:4364577b5ad8, 2020-11-09 (annotated)

Committer:
elijahsj
Date:
Mon Nov 09 00:33:19 2020 -0500
Revision:
2:4364577b5ad8
Parent:
1:8a094db1347f 
copied mbed library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elijahsj 1:8a094db1347f 1 /* mbed Microcontroller Library
elijahsj 1:8a094db1347f 2 * Copyright (c) 2015, STMicroelectronics
elijahsj 1:8a094db1347f 3 * All rights reserved.
elijahsj 1:8a094db1347f 4 *
elijahsj 1:8a094db1347f 5 * Redistribution and use in source and binary forms, with or without
elijahsj 1:8a094db1347f 6 * modification, are permitted provided that the following conditions are met:
elijahsj 1:8a094db1347f 7 *
elijahsj 1:8a094db1347f 8 * 1. Redistributions of source code must retain the above copyright notice,
elijahsj 1:8a094db1347f 9 * this list of conditions and the following disclaimer.
elijahsj 1:8a094db1347f 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
elijahsj 1:8a094db1347f 11 * this list of conditions and the following disclaimer in the documentation
elijahsj 1:8a094db1347f 12 * and/or other materials provided with the distribution.
elijahsj 1:8a094db1347f 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elijahsj 1:8a094db1347f 14 * may be used to endorse or promote products derived from this software
elijahsj 1:8a094db1347f 15 * without specific prior written permission.
elijahsj 1:8a094db1347f 16 *
elijahsj 1:8a094db1347f 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elijahsj 1:8a094db1347f 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elijahsj 1:8a094db1347f 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elijahsj 1:8a094db1347f 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elijahsj 1:8a094db1347f 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elijahsj 1:8a094db1347f 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elijahsj 1:8a094db1347f 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elijahsj 1:8a094db1347f 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elijahsj 1:8a094db1347f 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elijahsj 1:8a094db1347f 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elijahsj 1:8a094db1347f 27 */
elijahsj 1:8a094db1347f 28 #include "mbed_assert.h"
elijahsj 1:8a094db1347f 29 #include "analogin_api.h"
elijahsj 1:8a094db1347f 30
elijahsj 1:8a094db1347f 31 #if DEVICE_ANALOGIN
elijahsj 1:8a094db1347f 32
elijahsj 1:8a094db1347f 33 #include "mbed_wait_api.h"
elijahsj 1:8a094db1347f 34 #include "cmsis.h"
elijahsj 1:8a094db1347f 35 #include "pinmap.h"
elijahsj 1:8a094db1347f 36 #include "mbed_error.h"
elijahsj 1:8a094db1347f 37 #include "PeripheralPins.h"
elijahsj 1:8a094db1347f 38
elijahsj 1:8a094db1347f 39 int adc_inited = 0;
elijahsj 1:8a094db1347f 40
elijahsj 1:8a094db1347f 41 void analogin_init(analogin_t *obj, PinName pin)
elijahsj 1:8a094db1347f 42 {
elijahsj 1:8a094db1347f 43 uint32_t function = (uint32_t)NC;
elijahsj 1:8a094db1347f 44 obj->handle.Instance = (ADC_TypeDef *)NC;
elijahsj 1:8a094db1347f 45
elijahsj 1:8a094db1347f 46 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
elijahsj 1:8a094db1347f 47 // are described in PinNames.h and PeripheralPins.c
elijahsj 1:8a094db1347f 48 // Pin value must be between 0xF0 and 0xFF
elijahsj 1:8a094db1347f 49 if ((pin < 0xF0) || (pin >= 0x100)) {
elijahsj 1:8a094db1347f 50 // Normal channels
elijahsj 1:8a094db1347f 51 // Get the peripheral name from the pin and assign it to the object
elijahsj 1:8a094db1347f 52 obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
elijahsj 1:8a094db1347f 53 // Get the functions (adc channel) from the pin and assign it to the object
elijahsj 1:8a094db1347f 54 function = pinmap_function(pin, PinMap_ADC);
elijahsj 1:8a094db1347f 55 // Configure GPIO
elijahsj 1:8a094db1347f 56 pinmap_pinout(pin, PinMap_ADC);
elijahsj 1:8a094db1347f 57 } else {
elijahsj 1:8a094db1347f 58 // Internal channels
elijahsj 1:8a094db1347f 59 obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
elijahsj 1:8a094db1347f 60 function = pinmap_function(pin, PinMap_ADC_Internal);
elijahsj 1:8a094db1347f 61 // No GPIO configuration for internal channels
elijahsj 1:8a094db1347f 62 }
elijahsj 1:8a094db1347f 63 MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
elijahsj 1:8a094db1347f 64 MBED_ASSERT(function != (uint32_t)NC);
elijahsj 1:8a094db1347f 65
elijahsj 1:8a094db1347f 66 obj->channel = STM_PIN_CHANNEL(function);
elijahsj 1:8a094db1347f 67
elijahsj 1:8a094db1347f 68 // Save pin number for the read function
elijahsj 1:8a094db1347f 69 obj->pin = pin;
elijahsj 1:8a094db1347f 70
elijahsj 1:8a094db1347f 71 // The ADC initialization is done once
elijahsj 1:8a094db1347f 72 if (adc_inited == 0) {
elijahsj 1:8a094db1347f 73 adc_inited = 1;
elijahsj 1:8a094db1347f 74
elijahsj 1:8a094db1347f 75 obj->handle.State = HAL_ADC_STATE_RESET;
elijahsj 1:8a094db1347f 76 // Enable ADC clock
elijahsj 1:8a094db1347f 77 __ADC1_CLK_ENABLE();
elijahsj 1:8a094db1347f 78
elijahsj 1:8a094db1347f 79 // Configure ADC
elijahsj 1:8a094db1347f 80 obj->handle.Init.OversamplingMode = DISABLE;
elijahsj 1:8a094db1347f 81 obj->handle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV1;
elijahsj 1:8a094db1347f 82 obj->handle.Init.Resolution = ADC_RESOLUTION12b;
elijahsj 1:8a094db1347f 83 obj->handle.Init.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
elijahsj 1:8a094db1347f 84 obj->handle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
elijahsj 1:8a094db1347f 85 obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
elijahsj 1:8a094db1347f 86 obj->handle.Init.ContinuousConvMode = DISABLE;
elijahsj 1:8a094db1347f 87 obj->handle.Init.DiscontinuousConvMode = DISABLE;
elijahsj 1:8a094db1347f 88 obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
elijahsj 1:8a094db1347f 89 obj->handle.Init.ExternalTrigConv = ADC_EXTERNALTRIG0_T6_TRGO; // Not used here
elijahsj 1:8a094db1347f 90 obj->handle.Init.DMAContinuousRequests = DISABLE;
elijahsj 1:8a094db1347f 91 obj->handle.Init.EOCSelection = EOC_SINGLE_CONV;
elijahsj 1:8a094db1347f 92 obj->handle.Init.Overrun = OVR_DATA_OVERWRITTEN;
elijahsj 1:8a094db1347f 93 obj->handle.Init.LowPowerAutoWait = ENABLE;
elijahsj 1:8a094db1347f 94 obj->handle.Init.LowPowerFrequencyMode = DISABLE; // To be enabled only if ADC clock < 2.8 MHz
elijahsj 1:8a094db1347f 95 obj->handle.Init.LowPowerAutoPowerOff = DISABLE;
elijahsj 1:8a094db1347f 96
elijahsj 1:8a094db1347f 97 if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
elijahsj 1:8a094db1347f 98 error("Cannot initialize ADC");
elijahsj 1:8a094db1347f 99 }
elijahsj 1:8a094db1347f 100
elijahsj 1:8a094db1347f 101 // Calibration
elijahsj 1:8a094db1347f 102 HAL_ADCEx_Calibration_Start(&obj->handle, ADC_SINGLE_ENDED);
elijahsj 1:8a094db1347f 103
elijahsj 1:8a094db1347f 104 __HAL_ADC_ENABLE(&obj->handle);
elijahsj 1:8a094db1347f 105 }
elijahsj 1:8a094db1347f 106 }
elijahsj 1:8a094db1347f 107
elijahsj 1:8a094db1347f 108 static inline uint16_t adc_read(analogin_t *obj)
elijahsj 1:8a094db1347f 109 {
elijahsj 1:8a094db1347f 110 ADC_ChannelConfTypeDef sConfig = {0};
elijahsj 1:8a094db1347f 111
elijahsj 1:8a094db1347f 112 // Configure ADC channel
elijahsj 1:8a094db1347f 113 sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
elijahsj 1:8a094db1347f 114 switch (obj->channel) {
elijahsj 1:8a094db1347f 115 case 0:
elijahsj 1:8a094db1347f 116 sConfig.Channel = ADC_CHANNEL_0;
elijahsj 1:8a094db1347f 117 break;
elijahsj 1:8a094db1347f 118 case 1:
elijahsj 1:8a094db1347f 119 sConfig.Channel = ADC_CHANNEL_1;
elijahsj 1:8a094db1347f 120 break;
elijahsj 1:8a094db1347f 121 case 2:
elijahsj 1:8a094db1347f 122 sConfig.Channel = ADC_CHANNEL_2;
elijahsj 1:8a094db1347f 123 break;
elijahsj 1:8a094db1347f 124 case 3:
elijahsj 1:8a094db1347f 125 sConfig.Channel = ADC_CHANNEL_3;
elijahsj 1:8a094db1347f 126 break;
elijahsj 1:8a094db1347f 127 case 4:
elijahsj 1:8a094db1347f 128 sConfig.Channel = ADC_CHANNEL_4;
elijahsj 1:8a094db1347f 129 break;
elijahsj 1:8a094db1347f 130 case 5:
elijahsj 1:8a094db1347f 131 sConfig.Channel = ADC_CHANNEL_5;
elijahsj 1:8a094db1347f 132 break;
elijahsj 1:8a094db1347f 133 case 6:
elijahsj 1:8a094db1347f 134 sConfig.Channel = ADC_CHANNEL_6;
elijahsj 1:8a094db1347f 135 break;
elijahsj 1:8a094db1347f 136 case 7:
elijahsj 1:8a094db1347f 137 sConfig.Channel = ADC_CHANNEL_7;
elijahsj 1:8a094db1347f 138 break;
elijahsj 1:8a094db1347f 139 case 8:
elijahsj 1:8a094db1347f 140 sConfig.Channel = ADC_CHANNEL_8;
elijahsj 1:8a094db1347f 141 break;
elijahsj 1:8a094db1347f 142 case 9:
elijahsj 1:8a094db1347f 143 sConfig.Channel = ADC_CHANNEL_9;
elijahsj 1:8a094db1347f 144 break;
elijahsj 1:8a094db1347f 145 case 10:
elijahsj 1:8a094db1347f 146 sConfig.Channel = ADC_CHANNEL_10;
elijahsj 1:8a094db1347f 147 break;
elijahsj 1:8a094db1347f 148 case 11:
elijahsj 1:8a094db1347f 149 sConfig.Channel = ADC_CHANNEL_11;
elijahsj 1:8a094db1347f 150 break;
elijahsj 1:8a094db1347f 151 case 12:
elijahsj 1:8a094db1347f 152 sConfig.Channel = ADC_CHANNEL_12;
elijahsj 1:8a094db1347f 153 break;
elijahsj 1:8a094db1347f 154 case 13:
elijahsj 1:8a094db1347f 155 sConfig.Channel = ADC_CHANNEL_13;
elijahsj 1:8a094db1347f 156 break;
elijahsj 1:8a094db1347f 157 case 14:
elijahsj 1:8a094db1347f 158 sConfig.Channel = ADC_CHANNEL_14;
elijahsj 1:8a094db1347f 159 break;
elijahsj 1:8a094db1347f 160 case 15:
elijahsj 1:8a094db1347f 161 sConfig.Channel = ADC_CHANNEL_15;
elijahsj 1:8a094db1347f 162 break;
elijahsj 1:8a094db1347f 163 #ifdef ADC_CHANNEL_VLCD
elijahsj 1:8a094db1347f 164 case 16:
elijahsj 1:8a094db1347f 165 sConfig.Channel = ADC_CHANNEL_VLCD;
elijahsj 1:8a094db1347f 166 break;
elijahsj 1:8a094db1347f 167 #endif
elijahsj 1:8a094db1347f 168 case 17:
elijahsj 1:8a094db1347f 169 sConfig.Channel = ADC_CHANNEL_VREFINT;
elijahsj 1:8a094db1347f 170 break;
elijahsj 1:8a094db1347f 171 case 18:
elijahsj 1:8a094db1347f 172 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
elijahsj 1:8a094db1347f 173 break;
elijahsj 1:8a094db1347f 174 default:
elijahsj 1:8a094db1347f 175 return 0;
elijahsj 1:8a094db1347f 176 }
elijahsj 1:8a094db1347f 177
elijahsj 1:8a094db1347f 178 ADC1->CHSELR = 0; // [TODO] Workaround. To be removed after Cube driver is corrected.
elijahsj 1:8a094db1347f 179 HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
elijahsj 1:8a094db1347f 180
elijahsj 1:8a094db1347f 181 HAL_ADC_Start(&obj->handle); // Start conversion
elijahsj 1:8a094db1347f 182
elijahsj 1:8a094db1347f 183 // Wait end of conversion and get value
elijahsj 1:8a094db1347f 184 if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
elijahsj 1:8a094db1347f 185 return (HAL_ADC_GetValue(&obj->handle));
elijahsj 1:8a094db1347f 186 } else {
elijahsj 1:8a094db1347f 187 return 0;
elijahsj 1:8a094db1347f 188 }
elijahsj 1:8a094db1347f 189 }
elijahsj 1:8a094db1347f 190
elijahsj 1:8a094db1347f 191 uint16_t analogin_read_u16(analogin_t *obj)
elijahsj 1:8a094db1347f 192 {
elijahsj 1:8a094db1347f 193 uint16_t value = adc_read(obj);
elijahsj 1:8a094db1347f 194 // 12-bit to 16-bit conversion
elijahsj 1:8a094db1347f 195 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
elijahsj 1:8a094db1347f 196 return value;
elijahsj 1:8a094db1347f 197 }
elijahsj 1:8a094db1347f 198
elijahsj 1:8a094db1347f 199 float analogin_read(analogin_t *obj)
elijahsj 1:8a094db1347f 200 {
elijahsj 1:8a094db1347f 201 uint16_t value = adc_read(obj);
elijahsj 1:8a094db1347f 202 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
elijahsj 1:8a094db1347f 203 }
elijahsj 1:8a094db1347f 204
elijahsj 1:8a094db1347f 205 #endif