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mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F429ZI/analogin_api.c@428:4ddf7f7eabbb, 2014-12-08 (annotated)

Committer:
mbed_official
Date:
Mon Dec 08 07:30:07 2014 +0000
Revision:
428:4ddf7f7eabbb
Parent:
344:ed24f9926218 
Synchronized with git revision 3413e21e59b8b0d03c0addac95b1ead87f0b7965



Full URL: https://github.com/mbedmicro/mbed/commit/3413e21e59b8b0d03c0addac95b1ead87f0b7965/



Gitignore - Ignore cscope and vim swap files

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mbed_official 340:28d1f895c6fe 1 /* mbed Microcontroller Library
mbed_official 340:28d1f895c6fe 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 340:28d1f895c6fe 3 * All rights reserved.
mbed_official 340:28d1f895c6fe 4 *
mbed_official 340:28d1f895c6fe 5 * Redistribution and use in source and binary forms, with or without
mbed_official 340:28d1f895c6fe 6 * modification, are permitted provided that the following conditions are met:
mbed_official 340:28d1f895c6fe 7 *
mbed_official 340:28d1f895c6fe 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 340:28d1f895c6fe 9 * this list of conditions and the following disclaimer.
mbed_official 340:28d1f895c6fe 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 340:28d1f895c6fe 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 340:28d1f895c6fe 12 * and/or other materials provided with the distribution.
mbed_official 340:28d1f895c6fe 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 340:28d1f895c6fe 14 * may be used to endorse or promote products derived from this software
mbed_official 340:28d1f895c6fe 15 * without specific prior written permission.
mbed_official 340:28d1f895c6fe 16 *
mbed_official 340:28d1f895c6fe 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 340:28d1f895c6fe 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 340:28d1f895c6fe 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 340:28d1f895c6fe 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 340:28d1f895c6fe 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 340:28d1f895c6fe 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 340:28d1f895c6fe 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 340:28d1f895c6fe 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 340:28d1f895c6fe 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 340:28d1f895c6fe 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 340:28d1f895c6fe 27 */
mbed_official 340:28d1f895c6fe 28 #include "mbed_assert.h"
mbed_official 340:28d1f895c6fe 29 #include "analogin_api.h"
mbed_official 340:28d1f895c6fe 30
mbed_official 340:28d1f895c6fe 31 #if DEVICE_ANALOGIN
mbed_official 340:28d1f895c6fe 32
mbed_official 340:28d1f895c6fe 33 #include "wait_api.h"
mbed_official 340:28d1f895c6fe 34 #include "cmsis.h"
mbed_official 340:28d1f895c6fe 35 #include "pinmap.h"
mbed_official 428:4ddf7f7eabbb 36 #include "PeripheralPins.h"
mbed_official 340:28d1f895c6fe 37
mbed_official 340:28d1f895c6fe 38 ADC_HandleTypeDef AdcHandle;
mbed_official 340:28d1f895c6fe 39
mbed_official 340:28d1f895c6fe 40 int adc_inited = 0;
mbed_official 340:28d1f895c6fe 41
mbed_official 340:28d1f895c6fe 42 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 340:28d1f895c6fe 43 {
mbed_official 340:28d1f895c6fe 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 340:28d1f895c6fe 45 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 340:28d1f895c6fe 46 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 340:28d1f895c6fe 47
mbed_official 340:28d1f895c6fe 48 // Configure GPIO
mbed_official 340:28d1f895c6fe 49 pinmap_pinout(pin, PinMap_ADC);
mbed_official 340:28d1f895c6fe 50
mbed_official 340:28d1f895c6fe 51 // Save pin number for the read function
mbed_official 340:28d1f895c6fe 52 obj->pin = pin;
mbed_official 340:28d1f895c6fe 53
mbed_official 340:28d1f895c6fe 54 // The ADC initialization is done once
mbed_official 340:28d1f895c6fe 55 if (adc_inited == 0) {
mbed_official 340:28d1f895c6fe 56 adc_inited = 1;
mbed_official 340:28d1f895c6fe 57
mbed_official 340:28d1f895c6fe 58 // Enable ADC clock
mbed_official 340:28d1f895c6fe 59 __ADC1_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 60
mbed_official 340:28d1f895c6fe 61 // Configure ADC
mbed_official 340:28d1f895c6fe 62 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 340:28d1f895c6fe 63 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
mbed_official 340:28d1f895c6fe 64 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
mbed_official 340:28d1f895c6fe 65 AdcHandle.Init.ScanConvMode = DISABLE;
mbed_official 340:28d1f895c6fe 66 AdcHandle.Init.ContinuousConvMode = DISABLE;
mbed_official 340:28d1f895c6fe 67 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
mbed_official 340:28d1f895c6fe 68 AdcHandle.Init.NbrOfDiscConversion = 0;
mbed_official 340:28d1f895c6fe 69 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
mbed_official 340:28d1f895c6fe 70 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
mbed_official 340:28d1f895c6fe 71 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
mbed_official 340:28d1f895c6fe 72 AdcHandle.Init.NbrOfConversion = 1;
mbed_official 340:28d1f895c6fe 73 AdcHandle.Init.DMAContinuousRequests = DISABLE;
mbed_official 340:28d1f895c6fe 74 AdcHandle.Init.EOCSelection = DISABLE;
mbed_official 340:28d1f895c6fe 75 HAL_ADC_Init(&AdcHandle);
mbed_official 340:28d1f895c6fe 76 }
mbed_official 340:28d1f895c6fe 77 }
mbed_official 340:28d1f895c6fe 78
mbed_official 340:28d1f895c6fe 79 static inline uint16_t adc_read(analogin_t *obj)
mbed_official 340:28d1f895c6fe 80 {
mbed_official 340:28d1f895c6fe 81 ADC_ChannelConfTypeDef sConfig;
mbed_official 340:28d1f895c6fe 82
mbed_official 340:28d1f895c6fe 83 AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
mbed_official 340:28d1f895c6fe 84
mbed_official 340:28d1f895c6fe 85 // Configure ADC channel
mbed_official 340:28d1f895c6fe 86 sConfig.Rank = 1;
mbed_official 340:28d1f895c6fe 87 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
mbed_official 340:28d1f895c6fe 88 sConfig.Offset = 0;
mbed_official 340:28d1f895c6fe 89
mbed_official 340:28d1f895c6fe 90 switch (obj->pin) {
mbed_official 340:28d1f895c6fe 91 case PA_0:
mbed_official 340:28d1f895c6fe 92 sConfig.Channel = ADC_CHANNEL_0;
mbed_official 340:28d1f895c6fe 93 break;
mbed_official 340:28d1f895c6fe 94 case PA_1:
mbed_official 340:28d1f895c6fe 95 sConfig.Channel = ADC_CHANNEL_1;
mbed_official 340:28d1f895c6fe 96 break;
mbed_official 340:28d1f895c6fe 97 case PA_2:
mbed_official 340:28d1f895c6fe 98 sConfig.Channel = ADC_CHANNEL_2;
mbed_official 340:28d1f895c6fe 99 break;
mbed_official 340:28d1f895c6fe 100 case PA_3:
mbed_official 340:28d1f895c6fe 101 sConfig.Channel = ADC_CHANNEL_3;
mbed_official 340:28d1f895c6fe 102 break;
mbed_official 340:28d1f895c6fe 103 case PA_4:
mbed_official 340:28d1f895c6fe 104 sConfig.Channel = ADC_CHANNEL_4;
mbed_official 340:28d1f895c6fe 105 break;
mbed_official 340:28d1f895c6fe 106 case PA_5:
mbed_official 340:28d1f895c6fe 107 sConfig.Channel = ADC_CHANNEL_5;
mbed_official 340:28d1f895c6fe 108 break;
mbed_official 340:28d1f895c6fe 109 case PA_6:
mbed_official 340:28d1f895c6fe 110 sConfig.Channel = ADC_CHANNEL_6;
mbed_official 340:28d1f895c6fe 111 break;
mbed_official 340:28d1f895c6fe 112 case PA_7:
mbed_official 340:28d1f895c6fe 113 sConfig.Channel = ADC_CHANNEL_7;
mbed_official 340:28d1f895c6fe 114 break;
mbed_official 340:28d1f895c6fe 115 case PB_0:
mbed_official 340:28d1f895c6fe 116 sConfig.Channel = ADC_CHANNEL_8;
mbed_official 340:28d1f895c6fe 117 break;
mbed_official 340:28d1f895c6fe 118 case PB_1:
mbed_official 340:28d1f895c6fe 119 sConfig.Channel = ADC_CHANNEL_9;
mbed_official 340:28d1f895c6fe 120 break;
mbed_official 340:28d1f895c6fe 121 case PC_0:
mbed_official 340:28d1f895c6fe 122 sConfig.Channel = ADC_CHANNEL_10;
mbed_official 340:28d1f895c6fe 123 break;
mbed_official 340:28d1f895c6fe 124 case PC_1:
mbed_official 340:28d1f895c6fe 125 sConfig.Channel = ADC_CHANNEL_11;
mbed_official 340:28d1f895c6fe 126 break;
mbed_official 340:28d1f895c6fe 127 case PC_2:
mbed_official 340:28d1f895c6fe 128 sConfig.Channel = ADC_CHANNEL_12;
mbed_official 340:28d1f895c6fe 129 break;
mbed_official 340:28d1f895c6fe 130 case PC_3:
mbed_official 340:28d1f895c6fe 131 sConfig.Channel = ADC_CHANNEL_13;
mbed_official 340:28d1f895c6fe 132 break;
mbed_official 340:28d1f895c6fe 133 case PC_4:
mbed_official 340:28d1f895c6fe 134 sConfig.Channel = ADC_CHANNEL_14;
mbed_official 340:28d1f895c6fe 135 break;
mbed_official 340:28d1f895c6fe 136 case PC_5:
mbed_official 340:28d1f895c6fe 137 sConfig.Channel = ADC_CHANNEL_15;
mbed_official 340:28d1f895c6fe 138 break;
mbed_official 340:28d1f895c6fe 139 default:
mbed_official 340:28d1f895c6fe 140 return 0;
mbed_official 340:28d1f895c6fe 141 }
mbed_official 340:28d1f895c6fe 142
mbed_official 340:28d1f895c6fe 143 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
mbed_official 340:28d1f895c6fe 144
mbed_official 340:28d1f895c6fe 145 HAL_ADC_Start(&AdcHandle); // Start conversion
mbed_official 340:28d1f895c6fe 146
mbed_official 340:28d1f895c6fe 147 // Wait end of conversion and get value
mbed_official 340:28d1f895c6fe 148 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
mbed_official 340:28d1f895c6fe 149 return (HAL_ADC_GetValue(&AdcHandle));
mbed_official 340:28d1f895c6fe 150 } else {
mbed_official 340:28d1f895c6fe 151 return 0;
mbed_official 340:28d1f895c6fe 152 }
mbed_official 340:28d1f895c6fe 153 }
mbed_official 340:28d1f895c6fe 154
mbed_official 340:28d1f895c6fe 155 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 340:28d1f895c6fe 156 {
mbed_official 340:28d1f895c6fe 157 uint16_t value = adc_read(obj);
mbed_official 340:28d1f895c6fe 158 // 12-bit to 16-bit conversion
mbed_official 340:28d1f895c6fe 159 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
mbed_official 340:28d1f895c6fe 160 return value;
mbed_official 340:28d1f895c6fe 161 }
mbed_official 340:28d1f895c6fe 162
mbed_official 340:28d1f895c6fe 163 float analogin_read(analogin_t *obj)
mbed_official 340:28d1f895c6fe 164 {
mbed_official 340:28d1f895c6fe 165 uint16_t value = adc_read(obj);
mbed_official 340:28d1f895c6fe 166 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
mbed_official 340:28d1f895c6fe 167 }
mbed_official 340:28d1f895c6fe 168
mbed_official 340:28d1f895c6fe 169 #endif