mirror of https://github.com/ARMmbed/mbed-os.git
237 lines
8.9 KiB
C
237 lines
8.9 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2016, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "mbed_assert.h"
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#include "analogin_api.h"
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#if DEVICE_ANALOGIN
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#include "mbed_wait_api.h"
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#include "cmsis.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "PeripheralPins.h"
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void analogin_init(analogin_t *obj, PinName pin)
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{
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uint32_t function = (uint32_t)NC;
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// ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
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// are described in PinNames.h and PeripheralPins.c
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// Pin value must be between 0xF0 and 0xFF
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if ((pin < 0xF0) || (pin >= 0x100)) {
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// Normal channels
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// Get the peripheral name from the pin and assign it to the object
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obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
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// Get the functions (adc channel) from the pin and assign it to the object
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function = pinmap_function(pin, PinMap_ADC);
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// Configure GPIO
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pinmap_pinout(pin, PinMap_ADC);
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} else {
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// Internal channels
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obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
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function = pinmap_function(pin, PinMap_ADC_Internal);
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// No GPIO configuration for internal channels
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}
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MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
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MBED_ASSERT(function != (uint32_t)NC);
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obj->channel = STM_PIN_CHANNEL(function);
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// Save pin number for the read function
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obj->pin = pin;
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// Configure ADC object structures
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obj->handle.State = HAL_ADC_STATE_RESET;
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obj->handle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
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obj->handle.Init.Resolution = ADC_RESOLUTION_12B;
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obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
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obj->handle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
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obj->handle.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).
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obj->handle.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.
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obj->handle.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).
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obj->handle.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
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obj->handle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
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obj->handle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
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obj->handle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
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obj->handle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
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obj->handle.Init.ExternalTrigConv = 0; // Not used
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obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
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obj->handle.Init.DMAContinuousRequests = DISABLE;
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__HAL_RCC_ADC1_CLK_ENABLE();
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if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
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error("Cannot initialize ADC");
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}
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if (!__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY)) {
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// Enable the HSI (to clock the ADC)
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RCC_OscInitTypeDef RCC_OscInitStruct;
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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RCC_OscInitStruct.HSIState = RCC_HSI_ON;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
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HAL_RCC_OscConfig(&RCC_OscInitStruct);
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}
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}
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uint16_t adc_read(analogin_t *obj)
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{
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ADC_ChannelConfTypeDef sConfig = {0};
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// Configure ADC channel
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sConfig.Rank = ADC_REGULAR_RANK_1;
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sConfig.SamplingTime = ADC_SAMPLETIME_48CYCLES;
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switch (obj->channel) {
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case 0:
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sConfig.Channel = ADC_CHANNEL_0;
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break;
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case 1:
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sConfig.Channel = ADC_CHANNEL_1;
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break;
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case 2:
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sConfig.Channel = ADC_CHANNEL_2;
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break;
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case 3:
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sConfig.Channel = ADC_CHANNEL_3;
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break;
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case 4:
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sConfig.Channel = ADC_CHANNEL_4;
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break;
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case 5:
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sConfig.Channel = ADC_CHANNEL_5;
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break;
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case 6:
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sConfig.Channel = ADC_CHANNEL_6;
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break;
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case 7:
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sConfig.Channel = ADC_CHANNEL_7;
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break;
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case 8:
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sConfig.Channel = ADC_CHANNEL_8;
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break;
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case 9:
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sConfig.Channel = ADC_CHANNEL_9;
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break;
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case 10:
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sConfig.Channel = ADC_CHANNEL_10;
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break;
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case 11:
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sConfig.Channel = ADC_CHANNEL_11;
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break;
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case 12:
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sConfig.Channel = ADC_CHANNEL_12;
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break;
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case 13:
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sConfig.Channel = ADC_CHANNEL_13;
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break;
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case 14:
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sConfig.Channel = ADC_CHANNEL_14;
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break;
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case 15:
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sConfig.Channel = ADC_CHANNEL_15;
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break;
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case 16:
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sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
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sConfig.SamplingTime = ADC_SAMPLETIME_384CYCLES;
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break;
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case 17:
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sConfig.Channel = ADC_CHANNEL_VREFINT;
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sConfig.SamplingTime = ADC_SAMPLETIME_384CYCLES;
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break;
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case 18:
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sConfig.Channel = ADC_CHANNEL_18;
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break;
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case 19:
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sConfig.Channel = ADC_CHANNEL_19;
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break;
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case 20:
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sConfig.Channel = ADC_CHANNEL_20;
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break;
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case 21:
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sConfig.Channel = ADC_CHANNEL_21;
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break;
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case 22:
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sConfig.Channel = ADC_CHANNEL_22;
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break;
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case 23:
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sConfig.Channel = ADC_CHANNEL_23;
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break;
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case 24:
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sConfig.Channel = ADC_CHANNEL_24;
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break;
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case 25:
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sConfig.Channel = ADC_CHANNEL_25;
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break;
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case 26:
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sConfig.Channel = ADC_CHANNEL_26;
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break;
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#ifdef ADC_CHANNEL_27
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case 27:
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sConfig.Channel = ADC_CHANNEL_27;
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break;
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#endif
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#ifdef ADC_CHANNEL_28
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case 28:
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sConfig.Channel = ADC_CHANNEL_28;
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break;
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#endif
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#ifdef ADC_CHANNEL_29
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case 29:
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sConfig.Channel = ADC_CHANNEL_29;
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break;
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#endif
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#ifdef ADC_CHANNEL_30
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case 30:
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sConfig.Channel = ADC_CHANNEL_30;
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break;
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#endif
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#ifdef ADC_CHANNEL_31
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case 31:
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sConfig.Channel = ADC_CHANNEL_31;
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break;
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#endif
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default:
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return 0;
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}
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HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
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HAL_ADC_Start(&obj->handle); // Start conversion
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// Wait end of conversion and get value
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if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
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return (uint16_t)HAL_ADC_GetValue(&obj->handle);
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} else {
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return 0;
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}
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}
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#endif
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