mirror of https://github.com/ARMmbed/mbed-os.git
222 lines
7.0 KiB
C
222 lines
7.0 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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ADC_HandleTypeDef AdcHandle;
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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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obj->adc = (ADCName)NC;
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#if defined(ADC1)
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static int adc1_inited = 0;
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#endif
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#if defined(ADC2)
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static int adc2_inited = 0;
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#endif
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#if defined(ADC3)
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static int adc3_inited = 0;
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#endif
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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->adc = (ADCName)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->adc = (ADCName)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->adc != (ADCName)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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// Check if ADC is already initialized
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// Enable ADC clock
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#if defined(ADC1)
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if ((obj->adc == ADC_1) && adc1_inited) return;
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if (obj->adc == ADC_1) {
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__ADC1_CLK_ENABLE();
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adc1_inited = 1;
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}
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#endif
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#if defined(ADC2)
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if ((obj->adc == ADC_2) && adc2_inited) return;
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if (obj->adc == ADC_2) {
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__ADC2_CLK_ENABLE();
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adc2_inited = 1;
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}
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#endif
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#if defined(ADC3)
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if ((obj->adc == ADC_3) && adc3_inited) return;
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if (obj->adc == ADC_3) {
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__ADC3_CLK_ENABLE();
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adc3_inited = 1;
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}
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#endif
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// Configure ADC
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AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
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AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
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AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
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AdcHandle.Init.ScanConvMode = DISABLE;
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AdcHandle.Init.ContinuousConvMode = DISABLE;
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AdcHandle.Init.DiscontinuousConvMode = DISABLE;
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AdcHandle.Init.NbrOfDiscConversion = 0;
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AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
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AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
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AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
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AdcHandle.Init.NbrOfConversion = 1;
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AdcHandle.Init.DMAContinuousRequests = DISABLE;
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AdcHandle.Init.EOCSelection = DISABLE;
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if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
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error("Cannot initialize ADC\n");
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}
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}
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static inline uint16_t adc_read(analogin_t *obj)
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{
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ADC_ChannelConfTypeDef sConfig = {0};
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AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
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// Configure ADC channel
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sConfig.Rank = 1;
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sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
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sConfig.Offset = 0;
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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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break;
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case 17:
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sConfig.Channel = ADC_CHANNEL_VREFINT;
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break;
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case 18:
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sConfig.Channel = ADC_CHANNEL_VBAT;
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break;
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default:
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return 0;
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}
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HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
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HAL_ADC_Start(&AdcHandle); // Start conversion
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// Wait end of conversion and get value
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if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
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return (HAL_ADC_GetValue(&AdcHandle));
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} else {
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return 0;
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}
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}
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uint16_t analogin_read_u16(analogin_t *obj)
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{
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uint16_t value = adc_read(obj);
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// 12-bit to 16-bit conversion
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value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
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return value;
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}
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float analogin_read(analogin_t *obj)
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{
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uint16_t value = adc_read(obj);
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return (float)value * (1.0f / (float)0xFFF); // 12 bits range
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}
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#endif
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