MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_STM/TARGET_STM32F4/analogin_api.c@18:6a4db94011d3, 2017-05-14 (annotated)

Committer:
sahilmgandhi
Date:
Sun May 14 23:18:57 2017 +0000
Revision:
18:6a4db94011d3
Publishing again

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /* mbed Microcontroller Library
sahilmgandhi 18:6a4db94011d3 2 * Copyright (c) 2016, STMicroelectronics
sahilmgandhi 18:6a4db94011d3 3 * All rights reserved.
sahilmgandhi 18:6a4db94011d3 4 *
sahilmgandhi 18:6a4db94011d3 5 * Redistribution and use in source and binary forms, with or without
sahilmgandhi 18:6a4db94011d3 6 * modification, are permitted provided that the following conditions are met:
sahilmgandhi 18:6a4db94011d3 7 *
sahilmgandhi 18:6a4db94011d3 8 * 1. Redistributions of source code must retain the above copyright notice,
sahilmgandhi 18:6a4db94011d3 9 * this list of conditions and the following disclaimer.
sahilmgandhi 18:6a4db94011d3 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
sahilmgandhi 18:6a4db94011d3 11 * this list of conditions and the following disclaimer in the documentation
sahilmgandhi 18:6a4db94011d3 12 * and/or other materials provided with the distribution.
sahilmgandhi 18:6a4db94011d3 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
sahilmgandhi 18:6a4db94011d3 14 * may be used to endorse or promote products derived from this software
sahilmgandhi 18:6a4db94011d3 15 * without specific prior written permission.
sahilmgandhi 18:6a4db94011d3 16 *
sahilmgandhi 18:6a4db94011d3 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
sahilmgandhi 18:6a4db94011d3 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sahilmgandhi 18:6a4db94011d3 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
sahilmgandhi 18:6a4db94011d3 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
sahilmgandhi 18:6a4db94011d3 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sahilmgandhi 18:6a4db94011d3 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
sahilmgandhi 18:6a4db94011d3 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
sahilmgandhi 18:6a4db94011d3 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
sahilmgandhi 18:6a4db94011d3 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
sahilmgandhi 18:6a4db94011d3 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
sahilmgandhi 18:6a4db94011d3 27 */
sahilmgandhi 18:6a4db94011d3 28 #include "mbed_assert.h"
sahilmgandhi 18:6a4db94011d3 29 #include "analogin_api.h"
sahilmgandhi 18:6a4db94011d3 30
sahilmgandhi 18:6a4db94011d3 31 #if DEVICE_ANALOGIN
sahilmgandhi 18:6a4db94011d3 32
sahilmgandhi 18:6a4db94011d3 33 #include "mbed_wait_api.h"
sahilmgandhi 18:6a4db94011d3 34 #include "cmsis.h"
sahilmgandhi 18:6a4db94011d3 35 #include "pinmap.h"
sahilmgandhi 18:6a4db94011d3 36 #include "mbed_error.h"
sahilmgandhi 18:6a4db94011d3 37 #include "PeripheralPins.h"
sahilmgandhi 18:6a4db94011d3 38
sahilmgandhi 18:6a4db94011d3 39 ADC_HandleTypeDef AdcHandle;
sahilmgandhi 18:6a4db94011d3 40
sahilmgandhi 18:6a4db94011d3 41 void analogin_init(analogin_t *obj, PinName pin)
sahilmgandhi 18:6a4db94011d3 42 {
sahilmgandhi 18:6a4db94011d3 43 uint32_t function = (uint32_t)NC;
sahilmgandhi 18:6a4db94011d3 44 obj->adc = (ADCName)NC;
sahilmgandhi 18:6a4db94011d3 45
sahilmgandhi 18:6a4db94011d3 46 #if defined(ADC1)
sahilmgandhi 18:6a4db94011d3 47 static int adc1_inited = 0;
sahilmgandhi 18:6a4db94011d3 48 #endif
sahilmgandhi 18:6a4db94011d3 49 #if defined(ADC2)
sahilmgandhi 18:6a4db94011d3 50 static int adc2_inited = 0;
sahilmgandhi 18:6a4db94011d3 51 #endif
sahilmgandhi 18:6a4db94011d3 52 #if defined(ADC3)
sahilmgandhi 18:6a4db94011d3 53 static int adc3_inited = 0;
sahilmgandhi 18:6a4db94011d3 54 #endif
sahilmgandhi 18:6a4db94011d3 55 // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
sahilmgandhi 18:6a4db94011d3 56 // are described in PinNames.h and PeripheralPins.c
sahilmgandhi 18:6a4db94011d3 57 // Pin value must be >= 0xF0
sahilmgandhi 18:6a4db94011d3 58 if (pin < 0xF0) {
sahilmgandhi 18:6a4db94011d3 59 // Normal channels
sahilmgandhi 18:6a4db94011d3 60 // Get the peripheral name from the pin and assign it to the object
sahilmgandhi 18:6a4db94011d3 61 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
sahilmgandhi 18:6a4db94011d3 62 // Get the functions (adc channel) from the pin and assign it to the object
sahilmgandhi 18:6a4db94011d3 63 function = pinmap_function(pin, PinMap_ADC);
sahilmgandhi 18:6a4db94011d3 64 // Configure GPIO
sahilmgandhi 18:6a4db94011d3 65 pinmap_pinout(pin, PinMap_ADC);
sahilmgandhi 18:6a4db94011d3 66 } else {
sahilmgandhi 18:6a4db94011d3 67 // Internal channels
sahilmgandhi 18:6a4db94011d3 68 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC_Internal);
sahilmgandhi 18:6a4db94011d3 69 function = pinmap_function(pin, PinMap_ADC_Internal);
sahilmgandhi 18:6a4db94011d3 70 // No GPIO configuration for internal channels
sahilmgandhi 18:6a4db94011d3 71 }
sahilmgandhi 18:6a4db94011d3 72 MBED_ASSERT(obj->adc != (ADCName)NC);
sahilmgandhi 18:6a4db94011d3 73 MBED_ASSERT(function != (uint32_t)NC);
sahilmgandhi 18:6a4db94011d3 74
sahilmgandhi 18:6a4db94011d3 75 obj->channel = STM_PIN_CHANNEL(function);
sahilmgandhi 18:6a4db94011d3 76
sahilmgandhi 18:6a4db94011d3 77 // Save pin number for the read function
sahilmgandhi 18:6a4db94011d3 78 obj->pin = pin;
sahilmgandhi 18:6a4db94011d3 79
sahilmgandhi 18:6a4db94011d3 80 // Check if ADC is already initialized
sahilmgandhi 18:6a4db94011d3 81 // Enable ADC clock
sahilmgandhi 18:6a4db94011d3 82 #if defined(ADC1)
sahilmgandhi 18:6a4db94011d3 83 if ((obj->adc == ADC_1) && adc1_inited) return;
sahilmgandhi 18:6a4db94011d3 84 if (obj->adc == ADC_1) {
sahilmgandhi 18:6a4db94011d3 85 __ADC1_CLK_ENABLE();
sahilmgandhi 18:6a4db94011d3 86 adc1_inited = 1;
sahilmgandhi 18:6a4db94011d3 87 }
sahilmgandhi 18:6a4db94011d3 88 #endif
sahilmgandhi 18:6a4db94011d3 89 #if defined(ADC2)
sahilmgandhi 18:6a4db94011d3 90 if ((obj->adc == ADC_2) && adc2_inited) return;
sahilmgandhi 18:6a4db94011d3 91 if (obj->adc == ADC_2) {
sahilmgandhi 18:6a4db94011d3 92 __ADC2_CLK_ENABLE();
sahilmgandhi 18:6a4db94011d3 93 adc2_inited = 1;
sahilmgandhi 18:6a4db94011d3 94 }
sahilmgandhi 18:6a4db94011d3 95 #endif
sahilmgandhi 18:6a4db94011d3 96 #if defined(ADC3)
sahilmgandhi 18:6a4db94011d3 97 if ((obj->adc == ADC_3) && adc3_inited) return;
sahilmgandhi 18:6a4db94011d3 98 if (obj->adc == ADC_3) {
sahilmgandhi 18:6a4db94011d3 99 __ADC3_CLK_ENABLE();
sahilmgandhi 18:6a4db94011d3 100 adc3_inited = 1;
sahilmgandhi 18:6a4db94011d3 101 }
sahilmgandhi 18:6a4db94011d3 102 #endif
sahilmgandhi 18:6a4db94011d3 103 // Configure ADC
sahilmgandhi 18:6a4db94011d3 104 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
sahilmgandhi 18:6a4db94011d3 105 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
sahilmgandhi 18:6a4db94011d3 106 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
sahilmgandhi 18:6a4db94011d3 107 AdcHandle.Init.ScanConvMode = DISABLE;
sahilmgandhi 18:6a4db94011d3 108 AdcHandle.Init.ContinuousConvMode = DISABLE;
sahilmgandhi 18:6a4db94011d3 109 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
sahilmgandhi 18:6a4db94011d3 110 AdcHandle.Init.NbrOfDiscConversion = 0;
sahilmgandhi 18:6a4db94011d3 111 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
sahilmgandhi 18:6a4db94011d3 112 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
sahilmgandhi 18:6a4db94011d3 113 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
sahilmgandhi 18:6a4db94011d3 114 AdcHandle.Init.NbrOfConversion = 1;
sahilmgandhi 18:6a4db94011d3 115 AdcHandle.Init.DMAContinuousRequests = DISABLE;
sahilmgandhi 18:6a4db94011d3 116 AdcHandle.Init.EOCSelection = DISABLE;
sahilmgandhi 18:6a4db94011d3 117
sahilmgandhi 18:6a4db94011d3 118 if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
sahilmgandhi 18:6a4db94011d3 119 error("Cannot initialize ADC\n");
sahilmgandhi 18:6a4db94011d3 120 }
sahilmgandhi 18:6a4db94011d3 121 }
sahilmgandhi 18:6a4db94011d3 122
sahilmgandhi 18:6a4db94011d3 123 static inline uint16_t adc_read(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 124 {
sahilmgandhi 18:6a4db94011d3 125 ADC_ChannelConfTypeDef sConfig = {0};
sahilmgandhi 18:6a4db94011d3 126
sahilmgandhi 18:6a4db94011d3 127 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
sahilmgandhi 18:6a4db94011d3 128
sahilmgandhi 18:6a4db94011d3 129 // Configure ADC channel
sahilmgandhi 18:6a4db94011d3 130 sConfig.Rank = 1;
sahilmgandhi 18:6a4db94011d3 131 sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
sahilmgandhi 18:6a4db94011d3 132 sConfig.Offset = 0;
sahilmgandhi 18:6a4db94011d3 133
sahilmgandhi 18:6a4db94011d3 134 switch (obj->channel) {
sahilmgandhi 18:6a4db94011d3 135 case 0:
sahilmgandhi 18:6a4db94011d3 136 sConfig.Channel = ADC_CHANNEL_0;
sahilmgandhi 18:6a4db94011d3 137 break;
sahilmgandhi 18:6a4db94011d3 138 case 1:
sahilmgandhi 18:6a4db94011d3 139 sConfig.Channel = ADC_CHANNEL_1;
sahilmgandhi 18:6a4db94011d3 140 break;
sahilmgandhi 18:6a4db94011d3 141 case 2:
sahilmgandhi 18:6a4db94011d3 142 sConfig.Channel = ADC_CHANNEL_2;
sahilmgandhi 18:6a4db94011d3 143 break;
sahilmgandhi 18:6a4db94011d3 144 case 3:
sahilmgandhi 18:6a4db94011d3 145 sConfig.Channel = ADC_CHANNEL_3;
sahilmgandhi 18:6a4db94011d3 146 break;
sahilmgandhi 18:6a4db94011d3 147 case 4:
sahilmgandhi 18:6a4db94011d3 148 sConfig.Channel = ADC_CHANNEL_4;
sahilmgandhi 18:6a4db94011d3 149 break;
sahilmgandhi 18:6a4db94011d3 150 case 5:
sahilmgandhi 18:6a4db94011d3 151 sConfig.Channel = ADC_CHANNEL_5;
sahilmgandhi 18:6a4db94011d3 152 break;
sahilmgandhi 18:6a4db94011d3 153 case 6:
sahilmgandhi 18:6a4db94011d3 154 sConfig.Channel = ADC_CHANNEL_6;
sahilmgandhi 18:6a4db94011d3 155 break;
sahilmgandhi 18:6a4db94011d3 156 case 7:
sahilmgandhi 18:6a4db94011d3 157 sConfig.Channel = ADC_CHANNEL_7;
sahilmgandhi 18:6a4db94011d3 158 break;
sahilmgandhi 18:6a4db94011d3 159 case 8:
sahilmgandhi 18:6a4db94011d3 160 sConfig.Channel = ADC_CHANNEL_8;
sahilmgandhi 18:6a4db94011d3 161 break;
sahilmgandhi 18:6a4db94011d3 162 case 9:
sahilmgandhi 18:6a4db94011d3 163 sConfig.Channel = ADC_CHANNEL_9;
sahilmgandhi 18:6a4db94011d3 164 break;
sahilmgandhi 18:6a4db94011d3 165 case 10:
sahilmgandhi 18:6a4db94011d3 166 sConfig.Channel = ADC_CHANNEL_10;
sahilmgandhi 18:6a4db94011d3 167 break;
sahilmgandhi 18:6a4db94011d3 168 case 11:
sahilmgandhi 18:6a4db94011d3 169 sConfig.Channel = ADC_CHANNEL_11;
sahilmgandhi 18:6a4db94011d3 170 break;
sahilmgandhi 18:6a4db94011d3 171 case 12:
sahilmgandhi 18:6a4db94011d3 172 sConfig.Channel = ADC_CHANNEL_12;
sahilmgandhi 18:6a4db94011d3 173 break;
sahilmgandhi 18:6a4db94011d3 174 case 13:
sahilmgandhi 18:6a4db94011d3 175 sConfig.Channel = ADC_CHANNEL_13;
sahilmgandhi 18:6a4db94011d3 176 break;
sahilmgandhi 18:6a4db94011d3 177 case 14:
sahilmgandhi 18:6a4db94011d3 178 sConfig.Channel = ADC_CHANNEL_14;
sahilmgandhi 18:6a4db94011d3 179 break;
sahilmgandhi 18:6a4db94011d3 180 case 15:
sahilmgandhi 18:6a4db94011d3 181 sConfig.Channel = ADC_CHANNEL_15;
sahilmgandhi 18:6a4db94011d3 182 break;
sahilmgandhi 18:6a4db94011d3 183 case 16:
sahilmgandhi 18:6a4db94011d3 184 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
sahilmgandhi 18:6a4db94011d3 185 break;
sahilmgandhi 18:6a4db94011d3 186 case 17:
sahilmgandhi 18:6a4db94011d3 187 sConfig.Channel = ADC_CHANNEL_VREFINT;
sahilmgandhi 18:6a4db94011d3 188 break;
sahilmgandhi 18:6a4db94011d3 189 case 18:
sahilmgandhi 18:6a4db94011d3 190 sConfig.Channel = ADC_CHANNEL_VBAT;
sahilmgandhi 18:6a4db94011d3 191 break;
sahilmgandhi 18:6a4db94011d3 192 default:
sahilmgandhi 18:6a4db94011d3 193 return 0;
sahilmgandhi 18:6a4db94011d3 194 }
sahilmgandhi 18:6a4db94011d3 195
sahilmgandhi 18:6a4db94011d3 196 // Measuring VBAT sets the ADC_CCR_VBATE bit in ADC->CCR, and there is not
sahilmgandhi 18:6a4db94011d3 197 // possibility with the ST HAL driver to clear it. If it isn't cleared,
sahilmgandhi 18:6a4db94011d3 198 // VBAT remains connected to the ADC channel in preference to temperature,
sahilmgandhi 18:6a4db94011d3 199 // so VBAT readings are returned in place of temperature.
sahilmgandhi 18:6a4db94011d3 200 ADC->CCR &= ~(ADC_CCR_VBATE | ADC_CCR_TSVREFE);
sahilmgandhi 18:6a4db94011d3 201
sahilmgandhi 18:6a4db94011d3 202 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
sahilmgandhi 18:6a4db94011d3 203
sahilmgandhi 18:6a4db94011d3 204 HAL_ADC_Start(&AdcHandle); // Start conversion
sahilmgandhi 18:6a4db94011d3 205
sahilmgandhi 18:6a4db94011d3 206 // Wait end of conversion and get value
sahilmgandhi 18:6a4db94011d3 207 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
sahilmgandhi 18:6a4db94011d3 208 return (uint16_t)HAL_ADC_GetValue(&AdcHandle);
sahilmgandhi 18:6a4db94011d3 209 } else {
sahilmgandhi 18:6a4db94011d3 210 return 0;
sahilmgandhi 18:6a4db94011d3 211 }
sahilmgandhi 18:6a4db94011d3 212 }
sahilmgandhi 18:6a4db94011d3 213
sahilmgandhi 18:6a4db94011d3 214 uint16_t analogin_read_u16(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 215 {
sahilmgandhi 18:6a4db94011d3 216 uint16_t value = adc_read(obj);
sahilmgandhi 18:6a4db94011d3 217 // 12-bit to 16-bit conversion
sahilmgandhi 18:6a4db94011d3 218 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
sahilmgandhi 18:6a4db94011d3 219 return value;
sahilmgandhi 18:6a4db94011d3 220 }
sahilmgandhi 18:6a4db94011d3 221
sahilmgandhi 18:6a4db94011d3 222 float analogin_read(analogin_t *obj)
sahilmgandhi 18:6a4db94011d3 223 {
sahilmgandhi 18:6a4db94011d3 224 uint16_t value = adc_read(obj);
sahilmgandhi 18:6a4db94011d3 225 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
sahilmgandhi 18:6a4db94011d3 226 }
sahilmgandhi 18:6a4db94011d3 227
sahilmgandhi 18:6a4db94011d3 228 #endif