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targets/hal/TARGET_STM/TARGET_STM32F1/analogin_api.c@636:b0d178e9fa10, 2016-07-07 (annotated)

Committer:
lzbpli
Date:
Thu Jul 07 06:48:59 2016 +0000
Revision:
636:b0d178e9fa10
Parent:
508:4f5903e025e6 
l053

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 3 * All rights reserved.
mbed_official 52:a51c77007319 4 *
mbed_official 70:c1fbde68b492 5 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 6 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 7 *
mbed_official 70:c1fbde68b492 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 9 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 12 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 14 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 15 * without specific prior written permission.
mbed_official 52:a51c77007319 16 *
mbed_official 70:c1fbde68b492 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 52:a51c77007319 27 */
mbed_official 227:7bd0639b8911 28 #include "mbed_assert.h"
mbed_official 52:a51c77007319 29 #include "analogin_api.h"
mbed_official 52:a51c77007319 30
mbed_official 52:a51c77007319 31 #if DEVICE_ANALOGIN
mbed_official 52:a51c77007319 32
mbed_official 489:119543c9f674 33 #include "wait_api.h"
mbed_official 52:a51c77007319 34 #include "cmsis.h"
mbed_official 52:a51c77007319 35 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 36 #include "PeripheralPins.h"
mbed_official 52:a51c77007319 37
mbed_official 489:119543c9f674 38 ADC_HandleTypeDef AdcHandle;
mbed_official 489:119543c9f674 39
mbed_official 52:a51c77007319 40 int adc_inited = 0;
mbed_official 52:a51c77007319 41
mbed_official 402:09075a3b15e3 42 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 402:09075a3b15e3 43 {
mbed_official 489:119543c9f674 44 RCC_PeriphCLKInitTypeDef PeriphClkInit;
mbed_official 174:8bb9f3a33240 45
mbed_official 167:d5744491c362 46 // Get the peripheral name from the pin and assign it to the object
mbed_official 52:a51c77007319 47 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 48 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 52:a51c77007319 49
mbed_official 52:a51c77007319 50 // Configure GPIO
mbed_official 52:a51c77007319 51 pinmap_pinout(pin, PinMap_ADC);
mbed_official 52:a51c77007319 52
mbed_official 52:a51c77007319 53 // Save pin number for the read function
mbed_official 52:a51c77007319 54 obj->pin = pin;
mbed_official 52:a51c77007319 55
mbed_official 52:a51c77007319 56 // The ADC initialization is done once
mbed_official 52:a51c77007319 57 if (adc_inited == 0) {
mbed_official 52:a51c77007319 58 adc_inited = 1;
mbed_official 52:a51c77007319 59
mbed_official 489:119543c9f674 60 // Enable ADC clock
mbed_official 489:119543c9f674 61 __HAL_RCC_ADC1_CLK_ENABLE();
mbed_official 174:8bb9f3a33240 62
mbed_official 489:119543c9f674 63 // Configure ADC clock prescaler
mbed_official 489:119543c9f674 64 // Caution: On STM32F1, ADC clock frequency max is 14 MHz (refer to device datasheet).
mbed_official 489:119543c9f674 65 // Therefore, ADC clock prescaler must be configured in function
mbed_official 489:119543c9f674 66 // of ADC clock source frequency to remain below this maximum frequency.
mbed_official 489:119543c9f674 67 // with 8 MHz external xtal: PCLK2 = 72 MHz --> ADC clock = 72/6 = 12 MHz
mbed_official 489:119543c9f674 68 // with internal clock : PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.67 MHz
mbed_official 489:119543c9f674 69 PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
mbed_official 489:119543c9f674 70 PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
mbed_official 489:119543c9f674 71 HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
mbed_official 174:8bb9f3a33240 72
mbed_official 52:a51c77007319 73 // Configure ADC
mbed_official 489:119543c9f674 74 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 489:119543c9f674 75 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 489:119543c9f674 76 AdcHandle.Init.ScanConvMode = DISABLE;
mbed_official 489:119543c9f674 77 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 489:119543c9f674 78 AdcHandle.Init.NbrOfConversion = 1;
mbed_official 489:119543c9f674 79 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 489:119543c9f674 80 AdcHandle.Init.NbrOfDiscConversion = 0;
mbed_official 489:119543c9f674 81 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
mbed_official 489:119543c9f674 82 HAL_ADC_Init(&AdcHandle);
mbed_official 52:a51c77007319 83 }
mbed_official 52:a51c77007319 84 }
mbed_official 52:a51c77007319 85
mbed_official 402:09075a3b15e3 86 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 87 {
mbed_official 489:119543c9f674 88 ADC_ChannelConfTypeDef sConfig;
mbed_official 489:119543c9f674 89
mbed_official 489:119543c9f674 90 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 52:a51c77007319 91
mbed_official 174:8bb9f3a33240 92 // Configure ADC channel
mbed_official 489:119543c9f674 93 sConfig.Rank = 1;
mbed_official 489:119543c9f674 94 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
mbed_official 489:119543c9f674 95
mbed_official 174:8bb9f3a33240 96 switch (obj->pin) {
mbed_official 174:8bb9f3a33240 97 case PA_0:
mbed_official 489:119543c9f674 98 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 174:8bb9f3a33240 99 break;
mbed_official 174:8bb9f3a33240 100 case PA_1:
mbed_official 489:119543c9f674 101 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 174:8bb9f3a33240 102 break;
mbed_official 174:8bb9f3a33240 103 case PA_2:
mbed_official 489:119543c9f674 104 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 174:8bb9f3a33240 105 break;
mbed_official 174:8bb9f3a33240 106 case PA_3:
mbed_official 489:119543c9f674 107 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 174:8bb9f3a33240 108 break;
mbed_official 174:8bb9f3a33240 109 case PA_4:
mbed_official 489:119543c9f674 110 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 174:8bb9f3a33240 111 break;
mbed_official 174:8bb9f3a33240 112 case PA_5:
mbed_official 489:119543c9f674 113 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 174:8bb9f3a33240 114 break;
mbed_official 174:8bb9f3a33240 115 case PA_6:
mbed_official 489:119543c9f674 116 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 174:8bb9f3a33240 117 break;
mbed_official 174:8bb9f3a33240 118 case PA_7:
mbed_official 489:119543c9f674 119 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 174:8bb9f3a33240 120 break;
mbed_official 174:8bb9f3a33240 121 case PB_0:
mbed_official 489:119543c9f674 122 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 174:8bb9f3a33240 123 break;
mbed_official 174:8bb9f3a33240 124 case PB_1:
mbed_official 489:119543c9f674 125 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 174:8bb9f3a33240 126 break;
mbed_official 174:8bb9f3a33240 127 case PC_0:
mbed_official 489:119543c9f674 128 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 174:8bb9f3a33240 129 break;
mbed_official 174:8bb9f3a33240 130 case PC_1:
mbed_official 489:119543c9f674 131 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 174:8bb9f3a33240 132 break;
mbed_official 174:8bb9f3a33240 133 case PC_2:
mbed_official 489:119543c9f674 134 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 174:8bb9f3a33240 135 break;
mbed_official 174:8bb9f3a33240 136 case PC_3:
mbed_official 489:119543c9f674 137 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 174:8bb9f3a33240 138 break;
mbed_official 174:8bb9f3a33240 139 case PC_4:
mbed_official 489:119543c9f674 140 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 174:8bb9f3a33240 141 break;
mbed_official 174:8bb9f3a33240 142 case PC_5:
mbed_official 489:119543c9f674 143 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 174:8bb9f3a33240 144 break;
mbed_official 174:8bb9f3a33240 145 default:
mbed_official 174:8bb9f3a33240 146 return 0;
mbed_official 174:8bb9f3a33240 147 }
mbed_official 174:8bb9f3a33240 148
mbed_official 489:119543c9f674 149 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 174:8bb9f3a33240 150
mbed_official 489:119543c9f674 151 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 174:8bb9f3a33240 152
mbed_official 489:119543c9f674 153 // Wait end of conversion and get value
mbed_official 489:119543c9f674 154 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 489:119543c9f674 155 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 489:119543c9f674 156 } else {
mbed_official 489:119543c9f674 157 return 0;
mbed_official 489:119543c9f674 158 }
mbed_official 52:a51c77007319 159 }
mbed_official 52:a51c77007319 160
mbed_official 402:09075a3b15e3 161 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 402:09075a3b15e3 162 {
mbed_official 298:7557d401dbc3 163 uint16_t value = adc_read(obj);
mbed_official 298:7557d401dbc3 164 // 12-bit to 16-bit conversion
mbed_official 298:7557d401dbc3 165 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 298:7557d401dbc3 166 return value;
mbed_official 52:a51c77007319 167 }
mbed_official 52:a51c77007319 168
mbed_official 402:09075a3b15e3 169 float analogin_read(analogin_t *obj)
mbed_official 402:09075a3b15e3 170 {
mbed_official 174:8bb9f3a33240 171 uint16_t value = adc_read(obj);
mbed_official 174:8bb9f3a33240 172 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 52:a51c77007319 173 }
mbed_official 52:a51c77007319 174
mbed_official 52:a51c77007319 175 #endif