tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F334R8/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 void analogin_init(analogin_t *obj, PinName pin)
  41 {
  42     static int adc1_inited = 0;
  43     static int adc2_inited = 0;
  44
  45     // Get the peripheral name from the pin and assign it to the object
  46     obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
  47     MBED_ASSERT(obj->adc != (ADCName)NC);
  48
  49     // Configure GPIO
  50     pinmap_pinout(pin, PinMap_ADC);
  51
  52     // Save pin number for the read function
  53     obj->pin = pin;
  54
  55     // Check if ADC is already initialized
  56     if ((obj->adc == ADC_1) && adc1_inited) return;
  57     if ((obj->adc == ADC_2) && adc2_inited) return;
  58     if (obj->adc == ADC_1) adc1_inited = 1;
  59     if (obj->adc == ADC_2) adc2_inited = 1;
  60
  61     // Enable ADC clock
  62     __ADC12_CLK_ENABLE();
  63
  64     // Configure ADC
  65     AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
  66     AdcHandle.Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV2;
  67     AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
  68     AdcHandle.Init.ScanConvMode          = DISABLE;
  69     AdcHandle.Init.ContinuousConvMode    = DISABLE;
  70     AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  71     AdcHandle.Init.NbrOfDiscConversion   = 0;
  72     AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
  73     AdcHandle.Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
  74     AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
  75     AdcHandle.Init.NbrOfConversion       = 1;
  76     AdcHandle.Init.DMAContinuousRequests = DISABLE;
  77     AdcHandle.Init.EOCSelection          = DISABLE;
  78     HAL_ADC_Init(&AdcHandle);
  79 }
  80
  81 static inline uint16_t adc_read(analogin_t *obj)
  82 {
  83     ADC_ChannelConfTypeDef sConfig;
  84
  85     AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
  86
  87     // Configure ADC channel
  88     sConfig.Rank         = ADC_REGULAR_RANK_1;
  89     sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
  90     sConfig.SingleDiff   = ADC_SINGLE_ENDED;
  91     sConfig.OffsetNumber = ADC_OFFSET_NONE;
  92     sConfig.Offset       = 0;
  93
  94     switch (obj->pin) {
  95         case PA_0:
  96             sConfig.Channel = ADC_CHANNEL_1;
  97             break;
  98         case PA_1:
  99             sConfig.Channel = ADC_CHANNEL_2;
 100             break;
 101         case PA_2:
 102             sConfig.Channel = ADC_CHANNEL_3;
 103             break;
 104         case PA_3:
 105             sConfig.Channel = ADC_CHANNEL_4;
 106             break;
 107         case PA_4:
 108             sConfig.Channel = ADC_CHANNEL_1;
 109             break;
 110         case PA_5:
 111             sConfig.Channel = ADC_CHANNEL_2;
 112             break;
 113         case PA_6:
 114             sConfig.Channel = ADC_CHANNEL_3;
 115             break;
 116         case PA_7:
 117             sConfig.Channel = ADC_CHANNEL_4;
 118             break;
 119         case PB_0:
 120             sConfig.Channel = ADC_CHANNEL_11;
 121             break;
 122         case PB_1:
 123             sConfig.Channel = ADC_CHANNEL_12;
 124             break;
 125         case PB_2:
 126             sConfig.Channel = ADC_CHANNEL_12;
 127             break;
 128         case PB_12:
 129             sConfig.Channel = ADC_CHANNEL_13;
 130             break;
 131         case PB_13:
 132             sConfig.Channel = ADC_CHANNEL_13;
 133             break;
 134         case PB_14:
 135             sConfig.Channel = ADC_CHANNEL_14;
 136             break;
 137         case PB_15:
 138             sConfig.Channel = ADC_CHANNEL_15;
 139             break;
 140         case PC_0:
 141             sConfig.Channel = ADC_CHANNEL_6;
 142             break;
 143         case PC_1:
 144             sConfig.Channel = ADC_CHANNEL_7;
 145             break;
 146         case PC_2:
 147             sConfig.Channel = ADC_CHANNEL_8;
 148             break;
 149         case PC_3:
 150             sConfig.Channel = ADC_CHANNEL_9;
 151             break;
 152         case PC_4:
 153             sConfig.Channel = ADC_CHANNEL_5;
 154             break;
 155         case PC_5:
 156             sConfig.Channel = ADC_CHANNEL_11;
 157             break;
 158         default:
 159             return 0;
 160     }
 161
 162     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
 163
 164     HAL_ADC_Start(&AdcHandle); // Start conversion
 165
 166     // Wait end of conversion and get value
 167     if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
 168         return (HAL_ADC_GetValue(&AdcHandle));
 169     } else {
 170         return 0;
 171     }
 172 }
 173
 174 uint16_t analogin_read_u16(analogin_t *obj)
 175 {
 176     uint16_t value = adc_read(obj);
 177     // 12-bit to 16-bit conversion
 178     value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
 179     return value;
 180 }
 181
 182 float analogin_read(analogin_t *obj)
 183 {
 184     uint16_t value = adc_read(obj);
 185     return (float)value * (1.0f / (float)0xFFF); // 12 bits range
 186 }
 187
 188 #endif