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Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_STM/TARGET_STM32F4/analogin_api.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2016, STMicroelectronics
group-onsemi 0:098463de4c5d 3 * All rights reserved.
group-onsemi 0:098463de4c5d 4 *
group-onsemi 0:098463de4c5d 5 * Redistribution and use in source and binary forms, with or without
group-onsemi 0:098463de4c5d 6 * modification, are permitted provided that the following conditions are met:
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * 1. Redistributions of source code must retain the above copyright notice,
group-onsemi 0:098463de4c5d 9 * this list of conditions and the following disclaimer.
group-onsemi 0:098463de4c5d 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
group-onsemi 0:098463de4c5d 11 * this list of conditions and the following disclaimer in the documentation
group-onsemi 0:098463de4c5d 12 * and/or other materials provided with the distribution.
group-onsemi 0:098463de4c5d 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
group-onsemi 0:098463de4c5d 14 * may be used to endorse or promote products derived from this software
group-onsemi 0:098463de4c5d 15 * without specific prior written permission.
group-onsemi 0:098463de4c5d 16 *
group-onsemi 0:098463de4c5d 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
group-onsemi 0:098463de4c5d 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
group-onsemi 0:098463de4c5d 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
group-onsemi 0:098463de4c5d 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
group-onsemi 0:098463de4c5d 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
group-onsemi 0:098463de4c5d 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
group-onsemi 0:098463de4c5d 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
group-onsemi 0:098463de4c5d 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
group-onsemi 0:098463de4c5d 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
group-onsemi 0:098463de4c5d 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
group-onsemi 0:098463de4c5d 27 */
group-onsemi 0:098463de4c5d 28 #include "mbed_assert.h"
group-onsemi 0:098463de4c5d 29 #include "analogin_api.h"
group-onsemi 0:098463de4c5d 30
group-onsemi 0:098463de4c5d 31 #if DEVICE_ANALOGIN
group-onsemi 0:098463de4c5d 32
group-onsemi 0:098463de4c5d 33 #include "wait_api.h"
group-onsemi 0:098463de4c5d 34 #include "cmsis.h"
group-onsemi 0:098463de4c5d 35 #include "pinmap.h"
group-onsemi 0:098463de4c5d 36 #include "mbed_error.h"
group-onsemi 0:098463de4c5d 37 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 ADC_HandleTypeDef AdcHandle;
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 void analogin_init(analogin_t *obj, PinName pin)
group-onsemi 0:098463de4c5d 42 {
group-onsemi 0:098463de4c5d 43 #if defined(ADC1)
group-onsemi 0:098463de4c5d 44 static int adc1_inited = 0;
group-onsemi 0:098463de4c5d 45 #endif
group-onsemi 0:098463de4c5d 46 #if defined(ADC2)
group-onsemi 0:098463de4c5d 47 static int adc2_inited = 0;
group-onsemi 0:098463de4c5d 48 #endif
group-onsemi 0:098463de4c5d 49 #if defined(ADC3)
group-onsemi 0:098463de4c5d 50 static int adc3_inited = 0;
group-onsemi 0:098463de4c5d 51 #endif
group-onsemi 0:098463de4c5d 52 // Get the peripheral name from the pin and assign it to the object
group-onsemi 0:098463de4c5d 53 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
group-onsemi 0:098463de4c5d 54 MBED_ASSERT(obj->adc != (ADCName)NC);
group-onsemi 0:098463de4c5d 55
group-onsemi 0:098463de4c5d 56 // Get the functions (adc channel) from the pin and assign it to the object
group-onsemi 0:098463de4c5d 57 uint32_t function = pinmap_function(pin, PinMap_ADC);
group-onsemi 0:098463de4c5d 58 MBED_ASSERT(function != (uint32_t)NC);
group-onsemi 0:098463de4c5d 59 obj->channel = STM_PIN_CHANNEL(function);
group-onsemi 0:098463de4c5d 60
group-onsemi 0:098463de4c5d 61 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
group-onsemi 0:098463de4c5d 62 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
group-onsemi 0:098463de4c5d 63 if (pin < 0xF0) {
group-onsemi 0:098463de4c5d 64 pinmap_pinout(pin, PinMap_ADC);
group-onsemi 0:098463de4c5d 65 }
group-onsemi 0:098463de4c5d 66
group-onsemi 0:098463de4c5d 67 // Save pin number for the read function
group-onsemi 0:098463de4c5d 68 obj->pin = pin;
group-onsemi 0:098463de4c5d 69
group-onsemi 0:098463de4c5d 70 // Check if ADC is already initialized
group-onsemi 0:098463de4c5d 71 // Enable ADC clock
group-onsemi 0:098463de4c5d 72 #if defined(ADC1)
group-onsemi 0:098463de4c5d 73 if ((obj->adc == ADC_1) && adc1_inited) return;
group-onsemi 0:098463de4c5d 74 if (obj->adc == ADC_1) {
group-onsemi 0:098463de4c5d 75 __ADC1_CLK_ENABLE();
group-onsemi 0:098463de4c5d 76 adc1_inited = 1;
group-onsemi 0:098463de4c5d 77 }
group-onsemi 0:098463de4c5d 78 #endif
group-onsemi 0:098463de4c5d 79 #if defined(ADC2)
group-onsemi 0:098463de4c5d 80 if ((obj->adc == ADC_2) && adc2_inited) return;
group-onsemi 0:098463de4c5d 81 if (obj->adc == ADC_2) {
group-onsemi 0:098463de4c5d 82 __ADC2_CLK_ENABLE();
group-onsemi 0:098463de4c5d 83 adc2_inited = 1;
group-onsemi 0:098463de4c5d 84 }
group-onsemi 0:098463de4c5d 85 #endif
group-onsemi 0:098463de4c5d 86 #if defined(ADC3)
group-onsemi 0:098463de4c5d 87 if ((obj->adc == ADC_3) && adc3_inited) return;
group-onsemi 0:098463de4c5d 88 if (obj->adc == ADC_3) {
group-onsemi 0:098463de4c5d 89 __ADC3_CLK_ENABLE();
group-onsemi 0:098463de4c5d 90 adc3_inited = 1;
group-onsemi 0:098463de4c5d 91 }
group-onsemi 0:098463de4c5d 92 #endif
group-onsemi 0:098463de4c5d 93 // Configure ADC
group-onsemi 0:098463de4c5d 94 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
group-onsemi 0:098463de4c5d 95 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
group-onsemi 0:098463de4c5d 96 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
group-onsemi 0:098463de4c5d 97 AdcHandle.Init.ScanConvMode = DISABLE;
group-onsemi 0:098463de4c5d 98 AdcHandle.Init.ContinuousConvMode = DISABLE;
group-onsemi 0:098463de4c5d 99 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
group-onsemi 0:098463de4c5d 100 AdcHandle.Init.NbrOfDiscConversion = 0;
group-onsemi 0:098463de4c5d 101 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
group-onsemi 0:098463de4c5d 102 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
group-onsemi 0:098463de4c5d 103 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
group-onsemi 0:098463de4c5d 104 AdcHandle.Init.NbrOfConversion = 1;
group-onsemi 0:098463de4c5d 105 AdcHandle.Init.DMAContinuousRequests = DISABLE;
group-onsemi 0:098463de4c5d 106 AdcHandle.Init.EOCSelection = DISABLE;
group-onsemi 0:098463de4c5d 107
group-onsemi 0:098463de4c5d 108 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
group-onsemi 0:098463de4c5d 109 error("Cannot initialize ADC\n");
group-onsemi 0:098463de4c5d 110 }
group-onsemi 0:098463de4c5d 111 }
group-onsemi 0:098463de4c5d 112
group-onsemi 0:098463de4c5d 113 static inline uint16_t adc_read(analogin_t *obj)
group-onsemi 0:098463de4c5d 114 {
group-onsemi 0:098463de4c5d 115 ADC_ChannelConfTypeDef sConfig = {0};
group-onsemi 0:098463de4c5d 116
group-onsemi 0:098463de4c5d 117 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
group-onsemi 0:098463de4c5d 118
group-onsemi 0:098463de4c5d 119 // Configure ADC channel
group-onsemi 0:098463de4c5d 120 sConfig.Rank = 1;
group-onsemi 0:098463de4c5d 121 sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
group-onsemi 0:098463de4c5d 122 sConfig.Offset = 0;
group-onsemi 0:098463de4c5d 123
group-onsemi 0:098463de4c5d 124 switch (obj->channel) {
group-onsemi 0:098463de4c5d 125 case 0:
group-onsemi 0:098463de4c5d 126 sConfig.Channel = ADC_CHANNEL_0;
group-onsemi 0:098463de4c5d 127 break;
group-onsemi 0:098463de4c5d 128 case 1:
group-onsemi 0:098463de4c5d 129 sConfig.Channel = ADC_CHANNEL_1;
group-onsemi 0:098463de4c5d 130 break;
group-onsemi 0:098463de4c5d 131 case 2:
group-onsemi 0:098463de4c5d 132 sConfig.Channel = ADC_CHANNEL_2;
group-onsemi 0:098463de4c5d 133 break;
group-onsemi 0:098463de4c5d 134 case 3:
group-onsemi 0:098463de4c5d 135 sConfig.Channel = ADC_CHANNEL_3;
group-onsemi 0:098463de4c5d 136 break;
group-onsemi 0:098463de4c5d 137 case 4:
group-onsemi 0:098463de4c5d 138 sConfig.Channel = ADC_CHANNEL_4;
group-onsemi 0:098463de4c5d 139 break;
group-onsemi 0:098463de4c5d 140 case 5:
group-onsemi 0:098463de4c5d 141 sConfig.Channel = ADC_CHANNEL_5;
group-onsemi 0:098463de4c5d 142 break;
group-onsemi 0:098463de4c5d 143 case 6:
group-onsemi 0:098463de4c5d 144 sConfig.Channel = ADC_CHANNEL_6;
group-onsemi 0:098463de4c5d 145 break;
group-onsemi 0:098463de4c5d 146 case 7:
group-onsemi 0:098463de4c5d 147 sConfig.Channel = ADC_CHANNEL_7;
group-onsemi 0:098463de4c5d 148 break;
group-onsemi 0:098463de4c5d 149 case 8:
group-onsemi 0:098463de4c5d 150 sConfig.Channel = ADC_CHANNEL_8;
group-onsemi 0:098463de4c5d 151 break;
group-onsemi 0:098463de4c5d 152 case 9:
group-onsemi 0:098463de4c5d 153 sConfig.Channel = ADC_CHANNEL_9;
group-onsemi 0:098463de4c5d 154 break;
group-onsemi 0:098463de4c5d 155 case 10:
group-onsemi 0:098463de4c5d 156 sConfig.Channel = ADC_CHANNEL_10;
group-onsemi 0:098463de4c5d 157 break;
group-onsemi 0:098463de4c5d 158 case 11:
group-onsemi 0:098463de4c5d 159 sConfig.Channel = ADC_CHANNEL_11;
group-onsemi 0:098463de4c5d 160 break;
group-onsemi 0:098463de4c5d 161 case 12:
group-onsemi 0:098463de4c5d 162 sConfig.Channel = ADC_CHANNEL_12;
group-onsemi 0:098463de4c5d 163 break;
group-onsemi 0:098463de4c5d 164 case 13:
group-onsemi 0:098463de4c5d 165 sConfig.Channel = ADC_CHANNEL_13;
group-onsemi 0:098463de4c5d 166 break;
group-onsemi 0:098463de4c5d 167 case 14:
group-onsemi 0:098463de4c5d 168 sConfig.Channel = ADC_CHANNEL_14;
group-onsemi 0:098463de4c5d 169 break;
group-onsemi 0:098463de4c5d 170 case 15:
group-onsemi 0:098463de4c5d 171 sConfig.Channel = ADC_CHANNEL_15;
group-onsemi 0:098463de4c5d 172 break;
group-onsemi 0:098463de4c5d 173 case 16:
group-onsemi 0:098463de4c5d 174 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
group-onsemi 0:098463de4c5d 175 break;
group-onsemi 0:098463de4c5d 176 case 17:
group-onsemi 0:098463de4c5d 177 sConfig.Channel = ADC_CHANNEL_VREFINT;
group-onsemi 0:098463de4c5d 178 break;
group-onsemi 0:098463de4c5d 179 case 18:
group-onsemi 0:098463de4c5d 180 sConfig.Channel = ADC_CHANNEL_VBAT;
group-onsemi 0:098463de4c5d 181 break;
group-onsemi 0:098463de4c5d 182 default:
group-onsemi 0:098463de4c5d 183 return 0;
group-onsemi 0:098463de4c5d 184 }
group-onsemi 0:098463de4c5d 185
group-onsemi 0:098463de4c5d 186 // Measuring VBAT sets the ADC_CCR_VBATE bit in ADC->CCR, and there is not
group-onsemi 0:098463de4c5d 187 // possibility with the ST HAL driver to clear it. If it isn't cleared,
group-onsemi 0:098463de4c5d 188 // VBAT remains connected to the ADC channel in preference to temperature,
group-onsemi 0:098463de4c5d 189 // so VBAT readings are returned in place of temperature.
group-onsemi 0:098463de4c5d 190 ADC->CCR &= ~(ADC_CCR_VBATE | ADC_CCR_TSVREFE);
group-onsemi 0:098463de4c5d 191
group-onsemi 0:098463de4c5d 192 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
group-onsemi 0:098463de4c5d 193
group-onsemi 0:098463de4c5d 194 HAL_ADC_Start(&AdcHandle); // Start conversion
group-onsemi 0:098463de4c5d 195
group-onsemi 0:098463de4c5d 196 // Wait end of conversion and get value
group-onsemi 0:098463de4c5d 197 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
group-onsemi 0:098463de4c5d 198 return (uint16_t)HAL_ADC_GetValue(&AdcHandle);
group-onsemi 0:098463de4c5d 199 } else {
group-onsemi 0:098463de4c5d 200 return 0;
group-onsemi 0:098463de4c5d 201 }
group-onsemi 0:098463de4c5d 202 }
group-onsemi 0:098463de4c5d 203
group-onsemi 0:098463de4c5d 204 uint16_t analogin_read_u16(analogin_t *obj)
group-onsemi 0:098463de4c5d 205 {
group-onsemi 0:098463de4c5d 206 uint16_t value = adc_read(obj);
group-onsemi 0:098463de4c5d 207 // 12-bit to 16-bit conversion
group-onsemi 0:098463de4c5d 208 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
group-onsemi 0:098463de4c5d 209 return value;
group-onsemi 0:098463de4c5d 210 }
group-onsemi 0:098463de4c5d 211
group-onsemi 0:098463de4c5d 212 float analogin_read(analogin_t *obj)
group-onsemi 0:098463de4c5d 213 {
group-onsemi 0:098463de4c5d 214 uint16_t value = adc_read(obj);
group-onsemi 0:098463de4c5d 215 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
group-onsemi 0:098463de4c5d 216 }
group-onsemi 0:098463de4c5d 217
group-onsemi 0:098463de4c5d 218 #endif