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- /* mbed Microcontroller Library
- * Copyright (c) 2016, 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 "mbed_wait_api.h"
- #include "cmsis.h"
- #include "pinmap.h"
- #include "mbed_error.h"
- #include "PeripheralPins.h"
- void analogin_init(analogin_t *obj, PinName pin)
- {
- uint32_t function = (uint32_t)NC;
- // ADC Internal Channels "pins" (Temperature, Vref, Vbat, ...)
- // are described in PinNames.h and PeripheralPins.c
- // Pin value must be between 0xF0 and 0xFF
- if ((pin < 0xF0) || (pin >= 0x100)) {
- // Normal channels
- // Get the peripheral name from the pin and assign it to the object
- obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
- // Get the functions (adc channel) from the pin and assign it to the object
- function = pinmap_function(pin, PinMap_ADC);
- // Configure GPIO
- pinmap_pinout(pin, PinMap_ADC);
- } else {
- // Internal channels
- obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
- function = pinmap_function(pin, PinMap_ADC_Internal);
- // No GPIO configuration for internal channels
- }
- MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
- MBED_ASSERT(function != (uint32_t)NC);
- obj->channel = STM_PIN_CHANNEL(function);
- // Save pin number for the read function
- obj->pin = pin;
- // Configure ADC object structures
- obj->handle.State = HAL_ADC_STATE_RESET;
- obj->handle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2; // Asynchronous clock mode, input ADC clock
- obj->handle.Init.Resolution = ADC_RESOLUTION_12B;
- obj->handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
- obj->handle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
- obj->handle.Init.EOCSelection = ADC_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).
- obj->handle.Init.LowPowerAutoWait = DISABLE;
- obj->handle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
- obj->handle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
- obj->handle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
- obj->handle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
- obj->handle.Init.ExternalTrigConv = ADC_SOFTWARE_START; // Software start to trig the 1st conversion manually, without external event
- obj->handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
- obj->handle.Init.DMAContinuousRequests = DISABLE;
- obj->handle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; // DR register is overwritten with the last conversion result in case of overrun
- obj->handle.Init.OversamplingMode = DISABLE; // No oversampling
- // Enable ADC clock
- __HAL_RCC_ADC_CLK_ENABLE();
- __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_SYSCLK);
- if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
- error("Cannot initialize ADC");
- }
- // ADC calibration is done only once
- if (!HAL_ADCEx_Calibration_GetValue(&obj->handle, ADC_SINGLE_ENDED)) {
- HAL_ADCEx_Calibration_Start(&obj->handle, ADC_SINGLE_ENDED);
- }
- }
- uint16_t adc_read(analogin_t *obj)
- {
- ADC_ChannelConfTypeDef sConfig = {0};
- // Configure ADC channel
- sConfig.Rank = ADC_REGULAR_RANK_1;
- sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5; // default value (1.5 us for 80MHz clock)
- sConfig.SingleDiff = ADC_SINGLE_ENDED;
- sConfig.OffsetNumber = ADC_OFFSET_NONE;
- sConfig.Offset = 0;
- switch (obj->channel) {
- case 0:
- sConfig.Channel = ADC_CHANNEL_VREFINT;
- sConfig.SamplingTime = ADC_SAMPLETIME_247CYCLES_5; // Minimum ADC sampling time when reading the internal reference voltage is 4us
- break;
- case 1:
- sConfig.Channel = ADC_CHANNEL_1;
- break;
- case 2:
- sConfig.Channel = ADC_CHANNEL_2;
- break;
- case 3:
- sConfig.Channel = ADC_CHANNEL_3;
- break;
- case 4:
- sConfig.Channel = ADC_CHANNEL_4;
- break;
- case 5:
- sConfig.Channel = ADC_CHANNEL_5;
- break;
- case 6:
- sConfig.Channel = ADC_CHANNEL_6;
- break;
- case 7:
- sConfig.Channel = ADC_CHANNEL_7;
- break;
- case 8:
- sConfig.Channel = ADC_CHANNEL_8;
- break;
- case 9:
- sConfig.Channel = ADC_CHANNEL_9;
- break;
- case 10:
- sConfig.Channel = ADC_CHANNEL_10;
- break;
- case 11:
- sConfig.Channel = ADC_CHANNEL_11;
- break;
- case 12:
- sConfig.Channel = ADC_CHANNEL_12;
- break;
- case 13:
- sConfig.Channel = ADC_CHANNEL_13;
- break;
- case 14:
- sConfig.Channel = ADC_CHANNEL_14;
- break;
- case 15:
- sConfig.Channel = ADC_CHANNEL_15;
- break;
- case 16:
- sConfig.Channel = ADC_CHANNEL_16;
- break;
- case 17:
- sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
- sConfig.SamplingTime = ADC_SAMPLETIME_247CYCLES_5; // Minimum ADC sampling time when reading the temperature is 5us
- break;
- case 18:
- sConfig.Channel = ADC_CHANNEL_VBAT;
- sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_5; // Minimum ADC sampling time when reading the VBAT is 12us
- break;
- default:
- return 0;
- }
- HAL_ADC_ConfigChannel(&obj->handle, &sConfig);
- HAL_ADC_Start(&obj->handle); // Start conversion
- // Wait end of conversion and get value
- if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
- return (uint16_t)HAL_ADC_GetValue(&obj->handle);
- } else {
- return 0;
- }
- }
- #endif
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