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targets/TARGET_STM/TARGET_STM32F2/analogin_api.c
- Committer:
- <>
- Date:
- 2016-11-08
- Revision:
- 150:02e0a0aed4ec
- Parent:
- 149:156823d33999
- Child:
- 160:d5399cc887bb
File content as of revision 150:02e0a0aed4ec:
/* 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 "wait_api.h" #include "cmsis.h" #include "pinmap.h" #include "mbed_error.h" #include "PeripheralPins.h" ADC_HandleTypeDef AdcHandle; void analogin_init(analogin_t *obj, PinName pin) { #if defined(ADC1) static int adc1_inited = 0; #endif #if defined(ADC2) static int adc2_inited = 0; #endif #if defined(ADC3) static int adc3_inited = 0; #endif // 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); // Get the functions (adc channel) from the pin and assign it to the object uint32_t function = pinmap_function(pin, PinMap_ADC); MBED_ASSERT(function != (uint32_t)NC); obj->channel = STM_PIN_CHANNEL(function); // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat, ...) // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0 if (pin < 0xF0) { pinmap_pinout(pin, PinMap_ADC); } // Save pin number for the read function obj->pin = pin; // Check if ADC is already initialized // Enable ADC clock #if defined(ADC1) if ((obj->adc == ADC_1) && adc1_inited) return; if (obj->adc == ADC_1) { __ADC1_CLK_ENABLE(); adc1_inited = 1; } #endif #if defined(ADC2) if ((obj->adc == ADC_2) && adc2_inited) return; if (obj->adc == ADC_2) { __ADC2_CLK_ENABLE(); adc2_inited = 1; } #endif #if defined(ADC3) if ((obj->adc == ADC_3) && adc3_inited) return; if (obj->adc == ADC_3) { __ADC3_CLK_ENABLE(); adc3_inited = 1; } #endif // Configure ADC AdcHandle.Instance = (ADC_TypeDef *)(obj->adc); AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2; AdcHandle.Init.Resolution = ADC_RESOLUTION12b; AdcHandle.Init.ScanConvMode = DISABLE; AdcHandle.Init.ContinuousConvMode = DISABLE; AdcHandle.Init.DiscontinuousConvMode = DISABLE; AdcHandle.Init.NbrOfDiscConversion = 0; AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1; AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT; AdcHandle.Init.NbrOfConversion = 1; AdcHandle.Init.DMAContinuousRequests = DISABLE; AdcHandle.Init.EOCSelection = DISABLE; if (HAL_ADC_Init(&AdcHandle) != HAL_OK) { error("Cannot initialize ADC\n"); } } static inline uint16_t adc_read(analogin_t *obj) { ADC_ChannelConfTypeDef sConfig = {0}; AdcHandle.Instance = (ADC_TypeDef *)(obj->adc); // Configure ADC channel sConfig.Rank = 1; sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES; sConfig.Offset = 0; switch (obj->channel) { case 0: sConfig.Channel = ADC_CHANNEL_0; 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_TEMPSENSOR; break; case 17: sConfig.Channel = ADC_CHANNEL_VREFINT; break; case 18: sConfig.Channel = ADC_CHANNEL_VBAT; break; default: return 0; } 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