tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F0/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_CLOCK_SYNC_PCLK_DIV4;
  64         AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
  65         AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
  66         AdcHandle.Init.ScanConvMode          = DISABLE;
  67         AdcHandle.Init.EOCSelection          = EOC_SINGLE_CONV;
  68         AdcHandle.Init.LowPowerAutoWait      = DISABLE;
  69         AdcHandle.Init.LowPowerAutoPowerOff  = DISABLE;
  70         AdcHandle.Init.ContinuousConvMode    = DISABLE;
  71         AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  72         AdcHandle.Init.ExternalTrigConv      = ADC_SOFTWARE_START;
  73         AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
  74         AdcHandle.Init.DMAContinuousRequests = DISABLE;
  75         AdcHandle.Init.Overrun               = OVR_DATA_OVERWRITTEN;
  76         HAL_ADC_Init(&AdcHandle);
  77
  78         // Run the ADC calibration
  79         HAL_ADCEx_Calibration_Start(&AdcHandle);
  80     }
  81 }
  82
  83 static inline uint16_t adc_read(analogin_t *obj)
  84 {
  85     ADC_ChannelConfTypeDef sConfig;
  86
  87     AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
  88
  89     // Configure ADC channel
  90     sConfig.Rank         = ADC_RANK_CHANNEL_NUMBER;
  91 #if defined (TARGET_STM32F091RC)
  92     sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
  93 #else
  94     sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
  95 #endif
  96
  97     switch (obj->pin) {
  98         case PA_0:
  99             sConfig.Channel = ADC_CHANNEL_0;
 100             break;
 101         case PA_1:
 102             sConfig.Channel = ADC_CHANNEL_1;
 103             break;
 104         case PA_2:
 105             sConfig.Channel = ADC_CHANNEL_2;
 106             break;
 107         case PA_3:
 108             sConfig.Channel = ADC_CHANNEL_3;
 109             break;
 110         case PA_4:
 111             sConfig.Channel = ADC_CHANNEL_4;
 112             break;
 113         case PA_5:
 114             sConfig.Channel = ADC_CHANNEL_5;
 115             break;
 116         case PA_6:
 117             sConfig.Channel = ADC_CHANNEL_6;
 118             break;
 119         case PA_7:
 120             sConfig.Channel = ADC_CHANNEL_7;
 121             break;
 122         case PB_0:
 123             sConfig.Channel = ADC_CHANNEL_8;
 124             break;
 125         case PB_1:
 126             sConfig.Channel = ADC_CHANNEL_9;
 127             break;
 128         case PC_0:
 129             sConfig.Channel = ADC_CHANNEL_10;
 130             break;
 131         case PC_1:
 132             sConfig.Channel = ADC_CHANNEL_11;
 133             break;
 134         case PC_2:
 135             sConfig.Channel = ADC_CHANNEL_12;
 136             break;
 137         case PC_3:
 138             sConfig.Channel = ADC_CHANNEL_13;
 139             break;
 140         case PC_4:
 141             sConfig.Channel = ADC_CHANNEL_14;
 142             break;
 143         case PC_5:
 144             sConfig.Channel = ADC_CHANNEL_15;
 145             break;
 146         default:
 147             return 0;
 148     }
 149
 150     // Clear all channels as it is not done in HAL_ADC_ConfigChannel()
 151     AdcHandle.Instance->CHSELR = 0;
 152
 153     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
 154
 155     HAL_ADC_Start(&AdcHandle); // Start conversion
 156
 157     // Wait end of conversion and get value
 158     if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
 159         return (HAL_ADC_GetValue(&AdcHandle));
 160     } else {
 161         return 0;
 162     }
 163 }
 164
 165 uint16_t analogin_read_u16(analogin_t *obj)
 166 {
 167     uint16_t value = adc_read(obj);
 168     // 12-bit to 16-bit conversion
 169     value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
 170     return value;
 171 }
 172
 173 float analogin_read(analogin_t *obj)
 174 {
 175     uint16_t value = adc_read(obj);
 176     return (float)value * (1.0f / (float)0xFFF); // 12 bits range
 177 }
 178
 179 #endif