/* 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