Fawwaz Nadzmy / mbed-src

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targets/hal/TARGET_STM/TARGET_STM32F7/analogin_api.c@573:ad23fe03a082, 2015-06-19 (annotated)

Committer:
mbed_official
Date:
Fri Jun 19 09:15:11 2015 +0100
Revision:
573:ad23fe03a082
Child:
582:a89625bcd809
Synchronized with git revision d47834cd4d729e5b36b4c1ad4650f8b8f6a9ab86



Full URL: https://github.com/mbedmicro/mbed/commit/d47834cd4d729e5b36b4c1ad4650f8b8f6a9ab86/



DISCO_F746NG - Add new target

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 573:ad23fe03a082 1 /* mbed Microcontroller Library
mbed_official 573:ad23fe03a082 2 * Copyright (c) 2015, STMicroelectronics
mbed_official 573:ad23fe03a082 3 * All rights reserved.
mbed_official 573:ad23fe03a082 4 *
mbed_official 573:ad23fe03a082 5 * Redistribution and use in source and binary forms, with or without
mbed_official 573:ad23fe03a082 6 * modification, are permitted provided that the following conditions are met:
mbed_official 573:ad23fe03a082 7 *
mbed_official 573:ad23fe03a082 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 573:ad23fe03a082 9 * this list of conditions and the following disclaimer.
mbed_official 573:ad23fe03a082 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 573:ad23fe03a082 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 573:ad23fe03a082 12 * and/or other materials provided with the distribution.
mbed_official 573:ad23fe03a082 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 573:ad23fe03a082 14 * may be used to endorse or promote products derived from this software
mbed_official 573:ad23fe03a082 15 * without specific prior written permission.
mbed_official 573:ad23fe03a082 16 *
mbed_official 573:ad23fe03a082 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 573:ad23fe03a082 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 573:ad23fe03a082 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 573:ad23fe03a082 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 573:ad23fe03a082 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 573:ad23fe03a082 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 573:ad23fe03a082 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 573:ad23fe03a082 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 573:ad23fe03a082 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 573:ad23fe03a082 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 573:ad23fe03a082 27 */
mbed_official 573:ad23fe03a082 28 #include "mbed_assert.h"
mbed_official 573:ad23fe03a082 29 #include "analogin_api.h"
mbed_official 573:ad23fe03a082 30
mbed_official 573:ad23fe03a082 31 #if DEVICE_ANALOGIN
mbed_official 573:ad23fe03a082 32
mbed_official 573:ad23fe03a082 33 #include "wait_api.h"
mbed_official 573:ad23fe03a082 34 #include "cmsis.h"
mbed_official 573:ad23fe03a082 35 #include "pinmap.h"
mbed_official 573:ad23fe03a082 36 #include "PeripheralPins.h"
mbed_official 573:ad23fe03a082 37
mbed_official 573:ad23fe03a082 38 ADC_HandleTypeDef AdcHandle;
mbed_official 573:ad23fe03a082 39
mbed_official 573:ad23fe03a082 40 int adc_inited = 0;
mbed_official 573:ad23fe03a082 41
mbed_official 573:ad23fe03a082 42 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 573:ad23fe03a082 43 {
mbed_official 573:ad23fe03a082 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 573:ad23fe03a082 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 573:ad23fe03a082 46 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 573:ad23fe03a082 47
mbed_official 573:ad23fe03a082 48 // Get the functions (adc channel) from the pin and assign it to the object
mbed_official 573:ad23fe03a082 49 uint32_t function = pinmap_function(pin, PinMap_ADC);
mbed_official 573:ad23fe03a082 50 MBED_ASSERT(function != (uint32_t)NC);
mbed_official 573:ad23fe03a082 51 obj->channel = STM_PIN_CHANNEL(function);
mbed_official 573:ad23fe03a082 52
mbed_official 573:ad23fe03a082 53 // Configure GPIO
mbed_official 573:ad23fe03a082 54 pinmap_pinout(pin, PinMap_ADC);
mbed_official 573:ad23fe03a082 55
mbed_official 573:ad23fe03a082 56 // Save pin number for the read function
mbed_official 573:ad23fe03a082 57 obj->pin = pin;
mbed_official 573:ad23fe03a082 58
mbed_official 573:ad23fe03a082 59 // The ADC initialization is done once
mbed_official 573:ad23fe03a082 60 if (adc_inited == 0) {
mbed_official 573:ad23fe03a082 61 adc_inited = 1;
mbed_official 573:ad23fe03a082 62
mbed_official 573:ad23fe03a082 63 // Enable ADC clock
mbed_official 573:ad23fe03a082 64 __ADC1_CLK_ENABLE();
mbed_official 573:ad23fe03a082 65
mbed_official 573:ad23fe03a082 66 // Configure ADC
mbed_official 573:ad23fe03a082 67 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 573:ad23fe03a082 68 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
mbed_official 573:ad23fe03a082 69 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
mbed_official 573:ad23fe03a082 70 AdcHandle.Init.ScanConvMode = DISABLE;
mbed_official 573:ad23fe03a082 71 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 573:ad23fe03a082 72 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 573:ad23fe03a082 73 AdcHandle.Init.NbrOfDiscConversion = 0;
mbed_official 573:ad23fe03a082 74 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
mbed_official 573:ad23fe03a082 75 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
mbed_official 573:ad23fe03a082 76 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 573:ad23fe03a082 77 AdcHandle.Init.NbrOfConversion = 1;
mbed_official 573:ad23fe03a082 78 AdcHandle.Init.DMAContinuousRequests = DISABLE;
mbed_official 573:ad23fe03a082 79 AdcHandle.Init.EOCSelection = DISABLE;
mbed_official 573:ad23fe03a082 80 HAL_ADC_Init(&AdcHandle);
mbed_official 573:ad23fe03a082 81 }
mbed_official 573:ad23fe03a082 82 }
mbed_official 573:ad23fe03a082 83
mbed_official 573:ad23fe03a082 84 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 573:ad23fe03a082 85 {
mbed_official 573:ad23fe03a082 86 ADC_ChannelConfTypeDef sConfig;
mbed_official 573:ad23fe03a082 87
mbed_official 573:ad23fe03a082 88 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 573:ad23fe03a082 89
mbed_official 573:ad23fe03a082 90 // Configure ADC channel
mbed_official 573:ad23fe03a082 91 sConfig.Rank = 1;
mbed_official 573:ad23fe03a082 92 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
mbed_official 573:ad23fe03a082 93 sConfig.Offset = 0;
mbed_official 573:ad23fe03a082 94
mbed_official 573:ad23fe03a082 95 switch (obj->channel) {
mbed_official 573:ad23fe03a082 96 case 0:
mbed_official 573:ad23fe03a082 97 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 573:ad23fe03a082 98 break;
mbed_official 573:ad23fe03a082 99 case 1:
mbed_official 573:ad23fe03a082 100 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 573:ad23fe03a082 101 break;
mbed_official 573:ad23fe03a082 102 case 2:
mbed_official 573:ad23fe03a082 103 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 573:ad23fe03a082 104 break;
mbed_official 573:ad23fe03a082 105 case 3:
mbed_official 573:ad23fe03a082 106 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 573:ad23fe03a082 107 break;
mbed_official 573:ad23fe03a082 108 case 4:
mbed_official 573:ad23fe03a082 109 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 573:ad23fe03a082 110 break;
mbed_official 573:ad23fe03a082 111 case 5:
mbed_official 573:ad23fe03a082 112 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 573:ad23fe03a082 113 break;
mbed_official 573:ad23fe03a082 114 case 6:
mbed_official 573:ad23fe03a082 115 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 573:ad23fe03a082 116 break;
mbed_official 573:ad23fe03a082 117 case 7:
mbed_official 573:ad23fe03a082 118 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 573:ad23fe03a082 119 break;
mbed_official 573:ad23fe03a082 120 case 8:
mbed_official 573:ad23fe03a082 121 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 573:ad23fe03a082 122 break;
mbed_official 573:ad23fe03a082 123 case 9:
mbed_official 573:ad23fe03a082 124 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 573:ad23fe03a082 125 break;
mbed_official 573:ad23fe03a082 126 case 10:
mbed_official 573:ad23fe03a082 127 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 573:ad23fe03a082 128 break;
mbed_official 573:ad23fe03a082 129 case 11:
mbed_official 573:ad23fe03a082 130 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 573:ad23fe03a082 131 break;
mbed_official 573:ad23fe03a082 132 case 12:
mbed_official 573:ad23fe03a082 133 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 573:ad23fe03a082 134 break;
mbed_official 573:ad23fe03a082 135 case 13:
mbed_official 573:ad23fe03a082 136 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 573:ad23fe03a082 137 break;
mbed_official 573:ad23fe03a082 138 case 14:
mbed_official 573:ad23fe03a082 139 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 573:ad23fe03a082 140 break;
mbed_official 573:ad23fe03a082 141 case 15:
mbed_official 573:ad23fe03a082 142 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 573:ad23fe03a082 143 break;
mbed_official 573:ad23fe03a082 144 default:
mbed_official 573:ad23fe03a082 145 return 0;
mbed_official 573:ad23fe03a082 146 }
mbed_official 573:ad23fe03a082 147
mbed_official 573:ad23fe03a082 148 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 573:ad23fe03a082 149
mbed_official 573:ad23fe03a082 150 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 573:ad23fe03a082 151
mbed_official 573:ad23fe03a082 152 // Wait end of conversion and get value
mbed_official 573:ad23fe03a082 153 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 573:ad23fe03a082 154 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 573:ad23fe03a082 155 } else {
mbed_official 573:ad23fe03a082 156 return 0;
mbed_official 573:ad23fe03a082 157 }
mbed_official 573:ad23fe03a082 158 }
mbed_official 573:ad23fe03a082 159
mbed_official 573:ad23fe03a082 160 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 573:ad23fe03a082 161 {
mbed_official 573:ad23fe03a082 162 uint16_t value = adc_read(obj);
mbed_official 573:ad23fe03a082 163 // 12-bit to 16-bit conversion
mbed_official 573:ad23fe03a082 164 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 573:ad23fe03a082 165 return value;
mbed_official 573:ad23fe03a082 166 }
mbed_official 573:ad23fe03a082 167
mbed_official 573:ad23fe03a082 168 float analogin_read(analogin_t *obj)
mbed_official 573:ad23fe03a082 169 {
mbed_official 573:ad23fe03a082 170 uint16_t value = adc_read(obj);
mbed_official 573:ad23fe03a082 171 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 573:ad23fe03a082 172 }
mbed_official 573:ad23fe03a082 173
mbed_official 573:ad23fe03a082 174 #endif