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targets/hal/TARGET_STM/TARGET_STM32F0/analogin_api.c@469:fc4922e0c183, 2015-02-09 (annotated)

Committer:
mbed_official
Date:
Mon Feb 09 09:30:07 2015 +0000
Revision:
469:fc4922e0c183
Synchronized with git revision 06e2b3c8802cb4f78e9958ba9923755bd458e8b7



Full URL: https://github.com/mbedmicro/mbed/commit/06e2b3c8802cb4f78e9958ba9923755bd458e8b7/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 469:fc4922e0c183 1 /* mbed Microcontroller Library
mbed_official 469:fc4922e0c183 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 469:fc4922e0c183 3 * All rights reserved.
mbed_official 469:fc4922e0c183 4 *
mbed_official 469:fc4922e0c183 5 * Redistribution and use in source and binary forms, with or without
mbed_official 469:fc4922e0c183 6 * modification, are permitted provided that the following conditions are met:
mbed_official 469:fc4922e0c183 7 *
mbed_official 469:fc4922e0c183 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 469:fc4922e0c183 9 * this list of conditions and the following disclaimer.
mbed_official 469:fc4922e0c183 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 469:fc4922e0c183 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 469:fc4922e0c183 12 * and/or other materials provided with the distribution.
mbed_official 469:fc4922e0c183 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 469:fc4922e0c183 14 * may be used to endorse or promote products derived from this software
mbed_official 469:fc4922e0c183 15 * without specific prior written permission.
mbed_official 469:fc4922e0c183 16 *
mbed_official 469:fc4922e0c183 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 469:fc4922e0c183 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 469:fc4922e0c183 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 469:fc4922e0c183 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 469:fc4922e0c183 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 469:fc4922e0c183 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 469:fc4922e0c183 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 469:fc4922e0c183 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 469:fc4922e0c183 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 469:fc4922e0c183 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 469:fc4922e0c183 27 */
mbed_official 469:fc4922e0c183 28 #include "mbed_assert.h"
mbed_official 469:fc4922e0c183 29 #include "analogin_api.h"
mbed_official 469:fc4922e0c183 30
mbed_official 469:fc4922e0c183 31 #if DEVICE_ANALOGIN
mbed_official 469:fc4922e0c183 32
mbed_official 469:fc4922e0c183 33 #include "wait_api.h"
mbed_official 469:fc4922e0c183 34 #include "cmsis.h"
mbed_official 469:fc4922e0c183 35 #include "pinmap.h"
mbed_official 469:fc4922e0c183 36 #include "PeripheralPins.h"
mbed_official 469:fc4922e0c183 37
mbed_official 469:fc4922e0c183 38 ADC_HandleTypeDef AdcHandle;
mbed_official 469:fc4922e0c183 39
mbed_official 469:fc4922e0c183 40 int adc_inited = 0;
mbed_official 469:fc4922e0c183 41
mbed_official 469:fc4922e0c183 42 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 469:fc4922e0c183 43 {
mbed_official 469:fc4922e0c183 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 469:fc4922e0c183 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 469:fc4922e0c183 46 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 469:fc4922e0c183 47
mbed_official 469:fc4922e0c183 48 // Configure GPIO
mbed_official 469:fc4922e0c183 49 pinmap_pinout(pin, PinMap_ADC);
mbed_official 469:fc4922e0c183 50
mbed_official 469:fc4922e0c183 51 // Save pin number for the read function
mbed_official 469:fc4922e0c183 52 obj->pin = pin;
mbed_official 469:fc4922e0c183 53
mbed_official 469:fc4922e0c183 54 // The ADC initialization is done once
mbed_official 469:fc4922e0c183 55 if (adc_inited == 0) {
mbed_official 469:fc4922e0c183 56 adc_inited = 1;
mbed_official 469:fc4922e0c183 57
mbed_official 469:fc4922e0c183 58 // Enable ADC clock
mbed_official 469:fc4922e0c183 59 __ADC1_CLK_ENABLE();
mbed_official 469:fc4922e0c183 60
mbed_official 469:fc4922e0c183 61 // Configure ADC
mbed_official 469:fc4922e0c183 62 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 469:fc4922e0c183 63 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
mbed_official 469:fc4922e0c183 64 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
mbed_official 469:fc4922e0c183 65 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 469:fc4922e0c183 66 AdcHandle.Init.ScanConvMode = DISABLE;
mbed_official 469:fc4922e0c183 67 AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
mbed_official 469:fc4922e0c183 68 AdcHandle.Init.LowPowerAutoWait = DISABLE;
mbed_official 469:fc4922e0c183 69 AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
mbed_official 469:fc4922e0c183 70 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 469:fc4922e0c183 71 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 469:fc4922e0c183 72 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
mbed_official 469:fc4922e0c183 73 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
mbed_official 469:fc4922e0c183 74 AdcHandle.Init.DMAContinuousRequests = DISABLE;
mbed_official 469:fc4922e0c183 75 AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN;
mbed_official 469:fc4922e0c183 76 HAL_ADC_Init(&AdcHandle);
mbed_official 469:fc4922e0c183 77
mbed_official 469:fc4922e0c183 78 // Run the ADC calibration
mbed_official 469:fc4922e0c183 79 HAL_ADCEx_Calibration_Start(&AdcHandle);
mbed_official 469:fc4922e0c183 80 }
mbed_official 469:fc4922e0c183 81 }
mbed_official 469:fc4922e0c183 82
mbed_official 469:fc4922e0c183 83 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 469:fc4922e0c183 84 {
mbed_official 469:fc4922e0c183 85 ADC_ChannelConfTypeDef sConfig;
mbed_official 469:fc4922e0c183 86
mbed_official 469:fc4922e0c183 87 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 469:fc4922e0c183 88
mbed_official 469:fc4922e0c183 89 // Configure ADC channel
mbed_official 469:fc4922e0c183 90 sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
mbed_official 469:fc4922e0c183 91 #if defined (TARGET_STM32F091RC)
mbed_official 469:fc4922e0c183 92 sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
mbed_official 469:fc4922e0c183 93 #else
mbed_official 469:fc4922e0c183 94 sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
mbed_official 469:fc4922e0c183 95 #endif
mbed_official 469:fc4922e0c183 96
mbed_official 469:fc4922e0c183 97 switch (obj->pin) {
mbed_official 469:fc4922e0c183 98 case PA_0:
mbed_official 469:fc4922e0c183 99 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 469:fc4922e0c183 100 break;
mbed_official 469:fc4922e0c183 101 case PA_1:
mbed_official 469:fc4922e0c183 102 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 469:fc4922e0c183 103 break;
mbed_official 469:fc4922e0c183 104 case PA_2:
mbed_official 469:fc4922e0c183 105 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 469:fc4922e0c183 106 break;
mbed_official 469:fc4922e0c183 107 case PA_3:
mbed_official 469:fc4922e0c183 108 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 469:fc4922e0c183 109 break;
mbed_official 469:fc4922e0c183 110 case PA_4:
mbed_official 469:fc4922e0c183 111 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 469:fc4922e0c183 112 break;
mbed_official 469:fc4922e0c183 113 case PA_5:
mbed_official 469:fc4922e0c183 114 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 469:fc4922e0c183 115 break;
mbed_official 469:fc4922e0c183 116 case PA_6:
mbed_official 469:fc4922e0c183 117 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 469:fc4922e0c183 118 break;
mbed_official 469:fc4922e0c183 119 case PA_7:
mbed_official 469:fc4922e0c183 120 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 469:fc4922e0c183 121 break;
mbed_official 469:fc4922e0c183 122 case PB_0:
mbed_official 469:fc4922e0c183 123 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 469:fc4922e0c183 124 break;
mbed_official 469:fc4922e0c183 125 case PB_1:
mbed_official 469:fc4922e0c183 126 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 469:fc4922e0c183 127 break;
mbed_official 469:fc4922e0c183 128 case PC_0:
mbed_official 469:fc4922e0c183 129 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 469:fc4922e0c183 130 break;
mbed_official 469:fc4922e0c183 131 case PC_1:
mbed_official 469:fc4922e0c183 132 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 469:fc4922e0c183 133 break;
mbed_official 469:fc4922e0c183 134 case PC_2:
mbed_official 469:fc4922e0c183 135 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 469:fc4922e0c183 136 break;
mbed_official 469:fc4922e0c183 137 case PC_3:
mbed_official 469:fc4922e0c183 138 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 469:fc4922e0c183 139 break;
mbed_official 469:fc4922e0c183 140 case PC_4:
mbed_official 469:fc4922e0c183 141 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 469:fc4922e0c183 142 break;
mbed_official 469:fc4922e0c183 143 case PC_5:
mbed_official 469:fc4922e0c183 144 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 469:fc4922e0c183 145 break;
mbed_official 469:fc4922e0c183 146 default:
mbed_official 469:fc4922e0c183 147 return 0;
mbed_official 469:fc4922e0c183 148 }
mbed_official 469:fc4922e0c183 149
mbed_official 469:fc4922e0c183 150 // Clear all channels as it is not done in HAL_ADC_ConfigChannel()
mbed_official 469:fc4922e0c183 151 AdcHandle.Instance->CHSELR = 0;
mbed_official 469:fc4922e0c183 152
mbed_official 469:fc4922e0c183 153 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 469:fc4922e0c183 154
mbed_official 469:fc4922e0c183 155 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 469:fc4922e0c183 156
mbed_official 469:fc4922e0c183 157 // Wait end of conversion and get value
mbed_official 469:fc4922e0c183 158 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 469:fc4922e0c183 159 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 469:fc4922e0c183 160 } else {
mbed_official 469:fc4922e0c183 161 return 0;
mbed_official 469:fc4922e0c183 162 }
mbed_official 469:fc4922e0c183 163 }
mbed_official 469:fc4922e0c183 164
mbed_official 469:fc4922e0c183 165 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 469:fc4922e0c183 166 {
mbed_official 469:fc4922e0c183 167 uint16_t value = adc_read(obj);
mbed_official 469:fc4922e0c183 168 // 12-bit to 16-bit conversion
mbed_official 469:fc4922e0c183 169 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 469:fc4922e0c183 170 return value;
mbed_official 469:fc4922e0c183 171 }
mbed_official 469:fc4922e0c183 172
mbed_official 469:fc4922e0c183 173 float analogin_read(analogin_t *obj)
mbed_official 469:fc4922e0c183 174 {
mbed_official 469:fc4922e0c183 175 uint16_t value = adc_read(obj);
mbed_official 469:fc4922e0c183 176 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 469:fc4922e0c183 177 }
mbed_official 469:fc4922e0c183 178
mbed_official 469:fc4922e0c183 179 #endif