anyThing Connected Team / mbed-dev

mbed library sources. Supersedes mbed-src.

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targets/TARGET_STM/TARGET_STM32F4/analogin_api.c@180:d79f997829d6, 2017-12-18 (annotated)

Committer:
Anythingconnected
Date:
Mon Dec 18 10:14:27 2017 +0000
Revision:
180:d79f997829d6
Parent:
173:e131a1973e81 
Getting byte by byte read to work

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
<> 160:d5399cc887bb 33 #include "mbed_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 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 40 {
Anna Bridge 163:74e0ce7f98e8 41 uint32_t function = (uint32_t)NC;
Anna Bridge 163:74e0ce7f98e8 42
<> 149:156823d33999 43 #if defined(ADC1)
<> 149:156823d33999 44 static int adc1_inited = 0;
<> 149:156823d33999 45 #endif
<> 149:156823d33999 46 #if defined(ADC2)
<> 149:156823d33999 47 static int adc2_inited = 0;
<> 149:156823d33999 48 #endif
<> 149:156823d33999 49 #if defined(ADC3)
<> 149:156823d33999 50 static int adc3_inited = 0;
<> 149:156823d33999 51 #endif
Anna Bridge 163:74e0ce7f98e8 52 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
Anna Bridge 163:74e0ce7f98e8 53 // are described in PinNames.h and PeripheralPins.c
AnnaBridge 172:7d866c31b3c5 54 // Pin value must be between 0xF0 and 0xFF
AnnaBridge 172:7d866c31b3c5 55 if ((pin < 0xF0) || (pin >= 0x100)) {
Anna Bridge 163:74e0ce7f98e8 56 // Normal channels
Anna Bridge 163:74e0ce7f98e8 57 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 171:89b338f31ef1 58 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 59 // Get the functions (adc channel) from the pin and assign it to the object
Anna Bridge 163:74e0ce7f98e8 60 function = pinmap_function(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 61 // Configure GPIO
Anna Bridge 163:74e0ce7f98e8 62 pinmap_pinout(pin, PinMap_ADC);
Anna Bridge 163:74e0ce7f98e8 63 } else {
Anna Bridge 163:74e0ce7f98e8 64 // Internal channels
AnnaBridge 171:89b338f31ef1 65 obj->handle.Instance = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC_Internal);
Anna Bridge 163:74e0ce7f98e8 66 function = pinmap_function(pin, PinMap_ADC_Internal);
Anna Bridge 163:74e0ce7f98e8 67 // No GPIO configuration for internal channels
Anna Bridge 163:74e0ce7f98e8 68 }
AnnaBridge 171:89b338f31ef1 69 MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
<> 149:156823d33999 70 MBED_ASSERT(function != (uint32_t)NC);
Anna Bridge 163:74e0ce7f98e8 71
<> 149:156823d33999 72 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 73
<> 149:156823d33999 74 // Save pin number for the read function
<> 149:156823d33999 75 obj->pin = pin;
<> 149:156823d33999 76
<> 149:156823d33999 77 // Check if ADC is already initialized
<> 149:156823d33999 78 // Enable ADC clock
<> 149:156823d33999 79 #if defined(ADC1)
AnnaBridge 171:89b338f31ef1 80 if (((ADCName)obj->handle.Instance == ADC_1) && adc1_inited) return;
AnnaBridge 171:89b338f31ef1 81 if ((ADCName)obj->handle.Instance == ADC_1) {
AnnaBridge 167:e84263d55307 82 __HAL_RCC_ADC1_CLK_ENABLE();
<> 149:156823d33999 83 adc1_inited = 1;
<> 149:156823d33999 84 }
<> 149:156823d33999 85 #endif
<> 149:156823d33999 86 #if defined(ADC2)
AnnaBridge 171:89b338f31ef1 87 if (((ADCName)obj->handle.Instance == ADC_2) && adc2_inited) return;
AnnaBridge 171:89b338f31ef1 88 if ((ADCName)obj->handle.Instance == ADC_2) {
AnnaBridge 167:e84263d55307 89 __HAL_RCC_ADC2_CLK_ENABLE();
<> 149:156823d33999 90 adc2_inited = 1;
<> 149:156823d33999 91 }
<> 149:156823d33999 92 #endif
<> 149:156823d33999 93 #if defined(ADC3)
AnnaBridge 171:89b338f31ef1 94 if (((ADCName)obj->handle.Instance == ADC_3) && adc3_inited) return;
AnnaBridge 171:89b338f31ef1 95 if ((ADCName)obj->handle.Instance == ADC_3) {
AnnaBridge 167:e84263d55307 96 __HAL_RCC_ADC3_CLK_ENABLE();
<> 149:156823d33999 97 adc3_inited = 1;
<> 149:156823d33999 98 }
<> 149:156823d33999 99 #endif
<> 149:156823d33999 100 // Configure ADC
AnnaBridge 171:89b338f31ef1 101 obj->handle.State = HAL_ADC_STATE_RESET;
AnnaBridge 171:89b338f31ef1 102 obj->handle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
AnnaBridge 171:89b338f31ef1 103 obj->handle.Init.Resolution = ADC_RESOLUTION_12B;
AnnaBridge 171:89b338f31ef1 104 obj->handle.Init.ScanConvMode = DISABLE;
AnnaBridge 171:89b338f31ef1 105 obj->handle.Init.ContinuousConvMode = DISABLE;
AnnaBridge 171:89b338f31ef1 106 obj->handle.Init.DiscontinuousConvMode = DISABLE;
AnnaBridge 171:89b338f31ef1 107 obj->handle.Init.NbrOfDiscConversion = 0;
AnnaBridge 171:89b338f31ef1 108 obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AnnaBridge 171:89b338f31ef1 109 obj->handle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
AnnaBridge 171:89b338f31ef1 110 obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AnnaBridge 171:89b338f31ef1 111 obj->handle.Init.NbrOfConversion = 1;
AnnaBridge 171:89b338f31ef1 112 obj->handle.Init.DMAContinuousRequests = DISABLE;
AnnaBridge 171:89b338f31ef1 113 obj->handle.Init.EOCSelection = DISABLE;
<> 149:156823d33999 114
AnnaBridge 171:89b338f31ef1 115 if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
<> 149:156823d33999 116 error("Cannot initialize ADC\n");
<> 149:156823d33999 117 }
<> 149:156823d33999 118 }
<> 149:156823d33999 119
<> 149:156823d33999 120 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 121 {
<> 149:156823d33999 122 ADC_ChannelConfTypeDef sConfig = {0};
<> 149:156823d33999 123
<> 149:156823d33999 124 // Configure ADC channel
<> 149:156823d33999 125 sConfig.Rank = 1;
<> 149:156823d33999 126 sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
<> 149:156823d33999 127 sConfig.Offset = 0;
<> 149:156823d33999 128
<> 149:156823d33999 129 switch (obj->channel) {
<> 149:156823d33999 130 case 0:
<> 149:156823d33999 131 sConfig.Channel = ADC_CHANNEL_0;
<> 149:156823d33999 132 break;
<> 149:156823d33999 133 case 1:
<> 149:156823d33999 134 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 135 break;
<> 149:156823d33999 136 case 2:
<> 149:156823d33999 137 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 138 break;
<> 149:156823d33999 139 case 3:
<> 149:156823d33999 140 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 141 break;
<> 149:156823d33999 142 case 4:
<> 149:156823d33999 143 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 144 break;
<> 149:156823d33999 145 case 5:
<> 149:156823d33999 146 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 147 break;
<> 149:156823d33999 148 case 6:
<> 149:156823d33999 149 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 150 break;
<> 149:156823d33999 151 case 7:
<> 149:156823d33999 152 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 153 break;
<> 149:156823d33999 154 case 8:
<> 149:156823d33999 155 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 156 break;
<> 149:156823d33999 157 case 9:
<> 149:156823d33999 158 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 159 break;
<> 149:156823d33999 160 case 10:
<> 149:156823d33999 161 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 162 break;
<> 149:156823d33999 163 case 11:
<> 149:156823d33999 164 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 165 break;
<> 149:156823d33999 166 case 12:
<> 149:156823d33999 167 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 168 break;
<> 149:156823d33999 169 case 13:
<> 149:156823d33999 170 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 171 break;
<> 149:156823d33999 172 case 14:
<> 149:156823d33999 173 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 174 break;
<> 149:156823d33999 175 case 15:
<> 149:156823d33999 176 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 177 break;
<> 149:156823d33999 178 case 16:
<> 149:156823d33999 179 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 180 break;
<> 149:156823d33999 181 case 17:
<> 149:156823d33999 182 sConfig.Channel = ADC_CHANNEL_VREFINT;
AnnaBridge 173:e131a1973e81 183 /* From experiment, measurement needs max sampling time to be valid */
AnnaBridge 173:e131a1973e81 184 sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
<> 149:156823d33999 185 break;
<> 149:156823d33999 186 case 18:
<> 149:156823d33999 187 sConfig.Channel = ADC_CHANNEL_VBAT;
AnnaBridge 173:e131a1973e81 188 /* From experiment, measurement needs max sampling time to be valid */
Kojto 169:e3b6fe271b81 189 sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
<> 149:156823d33999 190 break;
<> 149:156823d33999 191 default:
<> 149:156823d33999 192 return 0;
<> 149:156823d33999 193 }
<> 149:156823d33999 194
<> 153:fa9ff456f731 195 // Measuring VBAT sets the ADC_CCR_VBATE bit in ADC->CCR, and there is not
<> 153:fa9ff456f731 196 // possibility with the ST HAL driver to clear it. If it isn't cleared,
<> 153:fa9ff456f731 197 // VBAT remains connected to the ADC channel in preference to temperature,
<> 153:fa9ff456f731 198 // so VBAT readings are returned in place of temperature.
<> 153:fa9ff456f731 199 ADC->CCR &= ~(ADC_CCR_VBATE | ADC_CCR_TSVREFE);
<> 153:fa9ff456f731 200
AnnaBridge 171:89b338f31ef1 201 HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
<> 149:156823d33999 202
AnnaBridge 171:89b338f31ef1 203 HAL_ADC_Start(&obj->handle); // Start conversion
<> 149:156823d33999 204
<> 149:156823d33999 205 // Wait end of conversion and get value
AnnaBridge 171:89b338f31ef1 206 if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
AnnaBridge 171:89b338f31ef1 207 return (uint16_t)HAL_ADC_GetValue(&obj->handle);
<> 149:156823d33999 208 } else {
<> 149:156823d33999 209 return 0;
<> 149:156823d33999 210 }
<> 149:156823d33999 211 }
<> 149:156823d33999 212
<> 149:156823d33999 213 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 214 {
<> 149:156823d33999 215 uint16_t value = adc_read(obj);
<> 149:156823d33999 216 // 12-bit to 16-bit conversion
<> 149:156823d33999 217 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 218 return value;
<> 149:156823d33999 219 }
<> 149:156823d33999 220
<> 149:156823d33999 221 float analogin_read(analogin_t *obj)
<> 149:156823d33999 222 {
<> 149:156823d33999 223 uint16_t value = adc_read(obj);
<> 149:156823d33999 224 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 225 }
<> 149:156823d33999 226
<> 149:156823d33999 227 #endif