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/* mbed Microcontroller Library
* Copyright (c) 2014, STMicroelectronics
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "mbed_assert.h"
#include "analogin_api.h"
#if DEVICE_ANALOGIN
#include "wait_api.h"
#include "cmsis.h"
#include "pinmap.h"
#include "PeripheralPins.h"
ADC_HandleTypeDef AdcHandle;
int adc_inited = 0;
void analogin_init(analogin_t *obj, PinName pin)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
// Get the peripheral name from the pin and assign it to the object
obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
MBED_ASSERT(obj->adc != (ADCName)NC);
// Configure GPIO
pinmap_pinout(pin, PinMap_ADC);
// Save pin number for the read function
obj->pin = pin;
// The ADC initialization is done once
if (adc_inited == 0) {
adc_inited = 1;
// Enable the HSI (to clock the ADC)
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
// Enable ADC clock
__ADC1_CLK_ENABLE();
// Configure ADC
AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
AdcHandle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV; // On STM32L1xx ADC, overrun detection is enabled only if EOC selection is set to each conversion (or transfer by DMA enabled, this is not the case in this example).
AdcHandle.Init.LowPowerAutoWait = ADC_AUTOWAIT_UNTIL_DATA_READ; // Enable the dynamic low power Auto Delay: new conversion start only when the previous conversion (for regular group) or previous sequence (for injected group) has been treated by user software.
AdcHandle.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_IDLE_PHASE; // Enable the auto-off mode: the ADC automatically powers-off after a conversion and automatically wakes-up when a new conversion is triggered (with startup time between trigger and start of sampling).
AdcHandle.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
AdcHandle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
AdcHandle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
AdcHandle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
AdcHandle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
AdcHandle.Init.ExternalTrigConv = 0; // Not used
AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
AdcHandle.Init.DMAContinuousRequests = DISABLE;
HAL_ADC_Init(&AdcHandle);
}
}
static inline uint16_t adc_read(analogin_t *obj)
{
ADC_ChannelConfTypeDef sConfig;
AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
// Configure ADC channel
switch (obj->pin) {
case PA_0:
sConfig.Channel = ADC_CHANNEL_0;
break;
case PA_1:
sConfig.Channel = ADC_CHANNEL_1;
break;
case PA_2:
sConfig.Channel = ADC_CHANNEL_2;
break;
case PA_3:
sConfig.Channel = ADC_CHANNEL_3;
break;
case PA_4:
sConfig.Channel = ADC_CHANNEL_4;
break;
case PA_5:
sConfig.Channel = ADC_CHANNEL_5;
break;
case PA_6:
sConfig.Channel = ADC_CHANNEL_6;
break;
case PA_7:
sConfig.Channel = ADC_CHANNEL_7;
break;
case PB_0:
sConfig.Channel = ADC_CHANNEL_8;
break;
case PB_1:
sConfig.Channel = ADC_CHANNEL_9;
break;
case PC_0:
sConfig.Channel = ADC_CHANNEL_10;
break;
case PC_1:
sConfig.Channel = ADC_CHANNEL_11;
break;
case PC_2:
sConfig.Channel = ADC_CHANNEL_12;
break;
case PC_3:
sConfig.Channel = ADC_CHANNEL_13;
break;
case PC_4:
sConfig.Channel = ADC_CHANNEL_14;
break;
case PC_5:
sConfig.Channel = ADC_CHANNEL_15;
break;
case PB_12:
sConfig.Channel = ADC_CHANNEL_18;
break;
case PB_13:
sConfig.Channel = ADC_CHANNEL_19;
break;
case PB_14:
sConfig.Channel = ADC_CHANNEL_20;
break;
case PB_15:
sConfig.Channel = ADC_CHANNEL_21;
break;
default:
return 0;
}
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES;
HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
HAL_ADC_Start(&AdcHandle); // Start conversion
// Wait end of conversion and get value
if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
return (HAL_ADC_GetValue(&AdcHandle));
} else {
return 0;
}
}
uint16_t analogin_read_u16(analogin_t *obj)
{
uint16_t value = adc_read(obj);
// 12-bit to 16-bit conversion
value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
return value;
}
float analogin_read(analogin_t *obj)
{
uint16_t value = adc_read(obj);
return (float)value * (1.0f / (float)0xFFF); // 12 bits range
}
#endif
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