b luo / mbed-dev

mbed library sources. With a patch for the can_api

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F1/analogin_api.c@151:91825d030f9b, 2016-11-14 (annotated)

Committer:
DangerousElectrician
Date:
Mon Nov 14 04:39:23 2016 +0000
Revision:
151:91825d030f9b
Parent:
150:02e0a0aed4ec 
stuff changed?

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 "PeripheralPins.h"
<> 149:156823d33999 37
<> 149:156823d33999 38 ADC_HandleTypeDef AdcHandle;
<> 149:156823d33999 39
<> 149:156823d33999 40 int adc_inited = 0;
<> 149:156823d33999 41
<> 149:156823d33999 42 void analogin_init(analogin_t *obj, PinName pin)
<> 149:156823d33999 43 {
<> 149:156823d33999 44 RCC_PeriphCLKInitTypeDef PeriphClkInit;
<> 149:156823d33999 45
<> 149:156823d33999 46 // Get the peripheral name from the pin and assign it to the object
<> 149:156823d33999 47 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 149:156823d33999 48 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 149:156823d33999 49
<> 149:156823d33999 50 // Get the functions (adc channel) from the pin and assign it to the object
<> 149:156823d33999 51 uint32_t function = pinmap_function(pin, PinMap_ADC);
<> 149:156823d33999 52 MBED_ASSERT(function != (uint32_t)NC);
<> 149:156823d33999 53 obj->channel = STM_PIN_CHANNEL(function);
<> 149:156823d33999 54
<> 150:02e0a0aed4ec 55 // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...)
<> 150:02e0a0aed4ec 56 // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0
<> 150:02e0a0aed4ec 57 if (pin < 0xF0) {
<> 149:156823d33999 58 pinmap_pinout(pin, PinMap_ADC);
<> 149:156823d33999 59 }
<> 149:156823d33999 60
<> 149:156823d33999 61 // Save pin number for the read function
<> 149:156823d33999 62 obj->pin = pin;
<> 149:156823d33999 63
<> 149:156823d33999 64 // The ADC initialization is done once
<> 149:156823d33999 65 if (adc_inited == 0) {
<> 149:156823d33999 66 adc_inited = 1;
<> 149:156823d33999 67
<> 149:156823d33999 68 // Enable ADC clock
<> 149:156823d33999 69 __HAL_RCC_ADC1_CLK_ENABLE();
<> 149:156823d33999 70
<> 149:156823d33999 71 // Configure ADC clock prescaler
<> 149:156823d33999 72 // Caution: On STM32F1, ADC clock frequency max is 14 MHz (refer to device datasheet).
<> 149:156823d33999 73 // Therefore, ADC clock prescaler must be configured in function
<> 149:156823d33999 74 // of ADC clock source frequency to remain below this maximum frequency.
<> 149:156823d33999 75 // with 8 MHz external xtal: PCLK2 = 72 MHz --> ADC clock = 72/6 = 12 MHz
<> 149:156823d33999 76 // with internal clock : PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.67 MHz
<> 149:156823d33999 77 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
<> 149:156823d33999 78 PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
<> 149:156823d33999 79 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
<> 149:156823d33999 80
<> 149:156823d33999 81 // Configure ADC
<> 149:156823d33999 82 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 83 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
<> 149:156823d33999 84 AdcHandle.Init.ScanConvMode = DISABLE;
<> 149:156823d33999 85 AdcHandle.Init.ContinuousConvMode = DISABLE;
<> 149:156823d33999 86 AdcHandle.Init.NbrOfConversion = 1;
<> 149:156823d33999 87 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
<> 149:156823d33999 88 AdcHandle.Init.NbrOfDiscConversion = 0;
<> 149:156823d33999 89 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
<> 149:156823d33999 90 HAL_ADC_Init(&AdcHandle);
<> 149:156823d33999 91 }
<> 149:156823d33999 92 }
<> 149:156823d33999 93
<> 149:156823d33999 94 static inline uint16_t adc_read(analogin_t *obj)
<> 149:156823d33999 95 {
<> 149:156823d33999 96 ADC_ChannelConfTypeDef sConfig;
<> 149:156823d33999 97
<> 149:156823d33999 98 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
<> 149:156823d33999 99
<> 149:156823d33999 100 // Configure ADC channel
<> 149:156823d33999 101 sConfig.Rank = 1;
<> 149:156823d33999 102 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
<> 149:156823d33999 103
<> 149:156823d33999 104 switch (obj->channel) {
<> 149:156823d33999 105 case 0:
<> 149:156823d33999 106 sConfig.Channel = ADC_CHANNEL_0;
<> 149:156823d33999 107 break;
<> 149:156823d33999 108 case 1:
<> 149:156823d33999 109 sConfig.Channel = ADC_CHANNEL_1;
<> 149:156823d33999 110 break;
<> 149:156823d33999 111 case 2:
<> 149:156823d33999 112 sConfig.Channel = ADC_CHANNEL_2;
<> 149:156823d33999 113 break;
<> 149:156823d33999 114 case 3:
<> 149:156823d33999 115 sConfig.Channel = ADC_CHANNEL_3;
<> 149:156823d33999 116 break;
<> 149:156823d33999 117 case 4:
<> 149:156823d33999 118 sConfig.Channel = ADC_CHANNEL_4;
<> 149:156823d33999 119 break;
<> 149:156823d33999 120 case 5:
<> 149:156823d33999 121 sConfig.Channel = ADC_CHANNEL_5;
<> 149:156823d33999 122 break;
<> 149:156823d33999 123 case 6:
<> 149:156823d33999 124 sConfig.Channel = ADC_CHANNEL_6;
<> 149:156823d33999 125 break;
<> 149:156823d33999 126 case 7:
<> 149:156823d33999 127 sConfig.Channel = ADC_CHANNEL_7;
<> 149:156823d33999 128 break;
<> 149:156823d33999 129 case 8:
<> 149:156823d33999 130 sConfig.Channel = ADC_CHANNEL_8;
<> 149:156823d33999 131 break;
<> 149:156823d33999 132 case 9:
<> 149:156823d33999 133 sConfig.Channel = ADC_CHANNEL_9;
<> 149:156823d33999 134 break;
<> 149:156823d33999 135 case 10:
<> 149:156823d33999 136 sConfig.Channel = ADC_CHANNEL_10;
<> 149:156823d33999 137 break;
<> 149:156823d33999 138 case 11:
<> 149:156823d33999 139 sConfig.Channel = ADC_CHANNEL_11;
<> 149:156823d33999 140 break;
<> 149:156823d33999 141 case 12:
<> 149:156823d33999 142 sConfig.Channel = ADC_CHANNEL_12;
<> 149:156823d33999 143 break;
<> 149:156823d33999 144 case 13:
<> 149:156823d33999 145 sConfig.Channel = ADC_CHANNEL_13;
<> 149:156823d33999 146 break;
<> 149:156823d33999 147 case 14:
<> 149:156823d33999 148 sConfig.Channel = ADC_CHANNEL_14;
<> 149:156823d33999 149 break;
<> 149:156823d33999 150 case 15:
<> 149:156823d33999 151 sConfig.Channel = ADC_CHANNEL_15;
<> 149:156823d33999 152 break;
<> 149:156823d33999 153 case 16:
<> 149:156823d33999 154 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
<> 149:156823d33999 155 break;
<> 149:156823d33999 156 case 17:
<> 149:156823d33999 157 sConfig.Channel = ADC_CHANNEL_VREFINT;
<> 149:156823d33999 158 break;
<> 149:156823d33999 159 default:
<> 149:156823d33999 160 return 0;
<> 149:156823d33999 161 }
<> 149:156823d33999 162
<> 149:156823d33999 163 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
<> 149:156823d33999 164
<> 149:156823d33999 165 HAL_ADC_Start(&AdcHandle); // Start conversion
<> 149:156823d33999 166
<> 149:156823d33999 167 // Wait end of conversion and get value
<> 149:156823d33999 168 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
<> 149:156823d33999 169 return (HAL_ADC_GetValue(&AdcHandle));
<> 149:156823d33999 170 } else {
<> 149:156823d33999 171 return 0;
<> 149:156823d33999 172 }
<> 149:156823d33999 173 }
<> 149:156823d33999 174
<> 149:156823d33999 175 uint16_t analogin_read_u16(analogin_t *obj)
<> 149:156823d33999 176 {
<> 149:156823d33999 177 uint16_t value = adc_read(obj);
<> 149:156823d33999 178 // 12-bit to 16-bit conversion
<> 149:156823d33999 179 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
<> 149:156823d33999 180 return value;
<> 149:156823d33999 181 }
<> 149:156823d33999 182
<> 149:156823d33999 183 float analogin_read(analogin_t *obj)
<> 149:156823d33999 184 {
<> 149:156823d33999 185 uint16_t value = adc_read(obj);
<> 149:156823d33999 186 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
<> 149:156823d33999 187 }
<> 149:156823d33999 188
<> 149:156823d33999 189 #endif