tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F302R8/analogin_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2014, STMicroelectronics
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright notice,
   9  *    this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright notice,
  11  *    this list of conditions and the following disclaimer in the documentation
  12  *    and/or other materials provided with the distribution.
  13  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  24  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 #include "mbed_assert.h"
  29 #include "analogin_api.h"
  30
  31 #if DEVICE_ANALOGIN
  32
  33 #include "wait_api.h"
  34 #include "cmsis.h"
  35 #include "pinmap.h"
  36 #include "PeripheralPins.h"
  37
  38 ADC_HandleTypeDef AdcHandle;
  39
  40 int adc_inited = 0;
  41
  42 void analogin_init(analogin_t *obj, PinName pin)
  43 {
  44     // Get the peripheral name from the pin and assign it to the object
  45     obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
  46     MBED_ASSERT(obj->adc != (ADCName)NC);
  47
  48     // Configure GPIO
  49     pinmap_pinout(pin, PinMap_ADC);
  50
  51     // Save pin number for the read function
  52     obj->pin = pin;
  53
  54     // The ADC initialization is done once
  55     if (adc_inited == 0) {
  56         adc_inited = 1;
  57
  58         // Enable ADC clock
  59         __ADC1_CLK_ENABLE();
  60
  61         // Configure ADC
  62         AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
  63         AdcHandle.Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV2;
  64         AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
  65         AdcHandle.Init.ScanConvMode          = DISABLE;
  66         AdcHandle.Init.ContinuousConvMode    = DISABLE;
  67         AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  68         AdcHandle.Init.NbrOfDiscConversion   = 0;
  69         AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
  70         AdcHandle.Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
  71         AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
  72         AdcHandle.Init.NbrOfConversion       = 1;
  73         AdcHandle.Init.DMAContinuousRequests = DISABLE;
  74         AdcHandle.Init.EOCSelection          = DISABLE;
  75         HAL_ADC_Init(&AdcHandle);
  76     }
  77 }
  78
  79 static inline uint16_t adc_read(analogin_t *obj)
  80 {
  81     ADC_ChannelConfTypeDef sConfig;
  82
  83     AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
  84
  85     // Configure ADC channel
  86     sConfig.Rank         = ADC_REGULAR_RANK_1;
  87     sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
  88     sConfig.SingleDiff   = ADC_SINGLE_ENDED;
  89     sConfig.OffsetNumber = ADC_OFFSET_NONE;
  90     sConfig.Offset       = 0;
  91
  92     switch (obj->pin) {
  93         case PA_0:
  94             sConfig.Channel = ADC_CHANNEL_1;
  95             break;
  96         case PA_1:
  97             sConfig.Channel = ADC_CHANNEL_2;
  98             break;
  99         case PA_2:
 100             sConfig.Channel = ADC_CHANNEL_3;
 101             break;
 102         case PA_3:
 103             sConfig.Channel = ADC_CHANNEL_4;
 104             break;
 105         case PA_4:
 106             sConfig.Channel = ADC_CHANNEL_5;
 107             break;
 108         case PA_6:
 109             sConfig.Channel = ADC_CHANNEL_10;
 110             break;
 111         case PA_7:
 112             sConfig.Channel = ADC_CHANNEL_15;
 113             break;
 114         case PB_0:
 115             sConfig.Channel = ADC_CHANNEL_11;
 116             break;
 117         case PB_1:
 118             sConfig.Channel = ADC_CHANNEL_12;
 119             break;
 120         case PB_11:
 121             sConfig.Channel = ADC_CHANNEL_14;
 122             break;
 123         case PB_13:
 124             sConfig.Channel = ADC_CHANNEL_13;
 125             break;
 126         case PC_0:
 127             sConfig.Channel = ADC_CHANNEL_6;
 128             break;
 129         case PC_1:
 130             sConfig.Channel = ADC_CHANNEL_7;
 131             break;
 132         case PC_2:
 133             sConfig.Channel = ADC_CHANNEL_8;
 134             break;
 135         case PC_3:
 136             sConfig.Channel = ADC_CHANNEL_9;
 137             break;
 138         default:
 139             return 0;
 140     }
 141
 142     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
 143
 144     HAL_ADC_Start(&AdcHandle); // Start conversion
 145
 146     // Wait end of conversion and get value
 147     if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
 148         return (HAL_ADC_GetValue(&AdcHandle));
 149     } else {
 150         return 0;
 151     }
 152 }
 153
 154 uint16_t analogin_read_u16(analogin_t *obj)
 155 {
 156     uint16_t value = adc_read(obj);
 157     // 12-bit to 16-bit conversion
 158     value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
 159     return value;
 160 }
 161
 162 float analogin_read(analogin_t *obj)
 163 {
 164     uint16_t value = adc_read(obj);
 165     return (float)value * (1.0f / (float)0xFFF); // 12 bits range
 166 }
 167
 168 #endif