396 lines
15 KiB
C
396 lines
15 KiB
C
/***************************************************************************//**
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* @file
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* @brief Analog Comparator (ACMP) peripheral API for EFM32.
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* @author Energy Micro AS
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* @version 2.3.0
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2011 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* This source code is the property of Energy Micro AS. The source and compiled
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* code may only be used on Energy Micro "EFM32" microcontrollers.
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*
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* This copyright notice may not be removed from the source code nor changed.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#ifndef __EFM32_ACMP_H
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#define __EFM32_ACMP_H
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#include <stdint.h>
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#include <stdbool.h>
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#include "efm32.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***************************************************************************//**
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* @addtogroup EFM32_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup ACMP
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* @{
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******************************************************************************/
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/*******************************************************************************
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******************************** ENUMS ************************************
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******************************************************************************/
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/** Resistor values used for capacative sense. See the datasheet for your
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* device for details on each resistor value. */
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typedef enum
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{
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/** resistor value 0 */
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acmpResistor0 = _ACMP_INPUTSEL_CSRESSEL_RES0,
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/** resistor value 1 */
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acmpResistor1 = _ACMP_INPUTSEL_CSRESSEL_RES1,
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/** resistor value 2 */
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acmpResistor2 = _ACMP_INPUTSEL_CSRESSEL_RES2,
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/** resistor value 3 */
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acmpResistor3 = _ACMP_INPUTSEL_CSRESSEL_RES3
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} ACMP_CapsenseResistor_TypeDef;
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/** Hysteresis level. See datasheet for your device for details on each
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* level. */
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typedef enum
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{
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acmpHysteresisLevel0 = _ACMP_CTRL_HYSTSEL_HYST0, /**< Hysteresis level 0 */
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acmpHysteresisLevel1 = _ACMP_CTRL_HYSTSEL_HYST1, /**< Hysteresis level 1 */
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acmpHysteresisLevel2 = _ACMP_CTRL_HYSTSEL_HYST2, /**< Hysteresis level 2 */
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acmpHysteresisLevel3 = _ACMP_CTRL_HYSTSEL_HYST3, /**< Hysteresis level 3 */
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acmpHysteresisLevel4 = _ACMP_CTRL_HYSTSEL_HYST4, /**< Hysteresis level 4 */
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acmpHysteresisLevel5 = _ACMP_CTRL_HYSTSEL_HYST5, /**< Hysteresis level 5 */
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acmpHysteresisLevel6 = _ACMP_CTRL_HYSTSEL_HYST6, /**< Hysteresis level 6 */
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acmpHysteresisLevel7 = _ACMP_CTRL_HYSTSEL_HYST7 /**< Hysteresis level 7 */
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} ACMP_HysteresisLevel_TypeDef;
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/** ACMP warmup time. The delay is measured in HFPERCLK cycles and should
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* be at least 10 us. */
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typedef enum
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{
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/** 4 HFPERCLK cycles warmup */
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acmpWarmTime4 = _ACMP_CTRL_WARMTIME_4CYCLES,
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/** 8 HFPERCLK cycles warmup */
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acmpWarmTime8 = _ACMP_CTRL_WARMTIME_8CYCLES,
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/** 16 HFPERCLK cycles warmup */
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acmpWarmTime16 = _ACMP_CTRL_WARMTIME_16CYCLES,
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/** 32 HFPERCLK cycles warmup */
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acmpWarmTime32 = _ACMP_CTRL_WARMTIME_32CYCLES,
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/** 64 HFPERCLK cycles warmup */
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acmpWarmTime64 = _ACMP_CTRL_WARMTIME_64CYCLES,
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/** 128 HFPERCLK cycles warmup */
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acmpWarmTime128 = _ACMP_CTRL_WARMTIME_128CYCLES,
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/** 256 HFPERCLK cycles warmup */
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acmpWarmTime256 = _ACMP_CTRL_WARMTIME_256CYCLES,
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/** 512 HFPERCLK cycles warmup */
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acmpWarmTime512 = _ACMP_CTRL_WARMTIME_512CYCLES
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} ACMP_WarmTime_TypeDef;
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/** ACMP inputs. Note that scaled VDD and bandgap references can only be used
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* as negative inputs. */
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typedef enum
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{
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/** Channel 0 */
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acmpChannel0 = _ACMP_INPUTSEL_NEGSEL_CH0,
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/** Channel 1 */
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acmpChannel1 = _ACMP_INPUTSEL_NEGSEL_CH1,
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/** Channel 2 */
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acmpChannel2 = _ACMP_INPUTSEL_NEGSEL_CH2,
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/** Channel 3 */
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acmpChannel3 = _ACMP_INPUTSEL_NEGSEL_CH3,
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/** Channel 4 */
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acmpChannel4 = _ACMP_INPUTSEL_NEGSEL_CH4,
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/** Channel 5 */
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acmpChannel5 = _ACMP_INPUTSEL_NEGSEL_CH5,
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/** Channel 6 */
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acmpChannel6 = _ACMP_INPUTSEL_NEGSEL_CH6,
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/** Channel 7 */
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acmpChannel7 = _ACMP_INPUTSEL_NEGSEL_CH7,
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/** 1.25V internal reference */
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acmpChannel1V25 = _ACMP_INPUTSEL_NEGSEL_1V25,
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/** 2.5V internal reference */
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acmpChannel2V5 = _ACMP_INPUTSEL_NEGSEL_2V5,
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/** Scaled VDD reference */
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acmpChannelVDD = _ACMP_INPUTSEL_NEGSEL_VDD,
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#if defined(_EFM32_GIANT_FAMILY) || defined(_EFM32_TINY_FAMILY)
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/** DAC0 channel 0 */
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acmpChannelDAC0Ch0 = _ACMP_INPUTSEL_NEGSEL_DAC0CH0,
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/** DAC0 channel 1 */
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acmpChannelDAC0Ch1 = _ACMP_INPUTSEL_NEGSEL_DAC0CH1,
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#endif
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} ACMP_Channel_TypeDef;
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/*******************************************************************************
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****************************** STRUCTS ************************************
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******************************************************************************/
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/** Capsense initialization structure. */
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typedef struct
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{
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/** Full bias current. See the ACMP chapter about bias and response time in
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* the reference manual for details. */
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bool fullBias;
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/** Half bias current. See the ACMP chapter about bias and response time in
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* the reference manual for details. */
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bool halfBias;
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/** Bias current. See the ACMP chapter about bias and response time in the
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* reference manual for details. Valid values are in the range 0-7. */
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uint32_t biasProg;
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/** Warmup time. This is measured in HFPERCLK cycles and should be
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* about 10us in wall clock time. */
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ACMP_WarmTime_TypeDef warmTime;
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/** Hysteresis level */
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ACMP_HysteresisLevel_TypeDef hysteresisLevel;
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/** Resistor used in the capacative sensing circuit. For values see
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* your device datasheet. */
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ACMP_CapsenseResistor_TypeDef resistor;
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/** Low power reference enabled. This setting, if enabled, reduces the
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* power used by the VDD and bandgap references. */
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bool lowPowerReferenceEnabled;
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/** Vdd reference value. VDD_SCALED = VDD <20> VDDLEVEL <20> 50mV/3.8V.
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* Valid values are in the range 0-63. */
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uint32_t vddLevel;
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/** If true, ACMP is being enabled after configuration. */
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bool enable;
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} ACMP_CapsenseInit_TypeDef;
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/** Default config for capacitive sense mode initialization. */
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#define ACMP_CAPSENSE_INIT_DEFAULT \
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{ false, /* fullBias */ \
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false, /* halfBias */ \
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0x7, /* biasProg */ \
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acmpWarmTime512, /* 512 cycle warmup to be safe */ \
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acmpHysteresisLevel5, \
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acmpResistor3, \
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false, /* low power reference */ \
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0x3D, /* VDD level */ \
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true /* Enable after init. */ \
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}
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/** ACMP initialization structure. */
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typedef struct
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{
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/** Full bias current. See the ACMP chapter about bias and response time in
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* the reference manual for details. */
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bool fullBias;
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/** Half bias current. See the ACMP chapter about bias and response time in
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* the reference manual for details. */
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bool halfBias;
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/** Bias current. See the ACMP chapter about bias and response time in the
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* reference manual for details. Valid values are in the range 0-7. */
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uint32_t biasProg;
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/** Enable setting the interrupt flag on falling edge */
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bool interruptOnFallingEdge;
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/** Enable setting the interrupt flag on rising edge */
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bool interruptOnRisingEdge;
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/** Warmup time. This is measured in HFPERCLK cycles and should be
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* about 10us in wall clock time. */
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ACMP_WarmTime_TypeDef warmTime;
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/** Hysteresis level */
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ACMP_HysteresisLevel_TypeDef hysteresisLevel;
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/** Inactive value emitted by the ACMP during warmup */
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bool inactiveValue;
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/** Low power reference enabled. This setting, if enabled, reduces the
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* power used by the VDD and bandgap references. */
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bool lowPowerReferenceEnabled;
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/** Vdd reference value. VDD_SCALED = VDD <20> VDDLEVEL <20> 50mV/3.8V.
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* Valid values are in the range 0-63. */
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uint32_t vddLevel;
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/** If true, ACMP is being enabled after configuration. */
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bool enable;
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} ACMP_Init_TypeDef;
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/** Default config for ACMP regular initialization. */
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#define ACMP_INIT_DEFAULT \
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{ false, /* fullBias */ \
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false, /* halfBias */ \
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0x7, /* biasProg */ \
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false, /* No interrupt on falling edge. */ \
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false, /* No interrupt on rising edge. */ \
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acmpWarmTime512, /* 512 cycle warmup to be safe */ \
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acmpHysteresisLevel5, \
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false, /* Disabled emitting inactive value during warmup. */ \
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false, /* low power reference */ \
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0x3D, /* VDD level */ \
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true /* Enable after init. */ \
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}
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/*******************************************************************************
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***************************** PROTOTYPES **********************************
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******************************************************************************/
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void ACMP_CapsenseInit(ACMP_TypeDef *acmp, const ACMP_CapsenseInit_TypeDef *init);
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void ACMP_CapsenseChannelSet(ACMP_TypeDef *acmp, ACMP_Channel_TypeDef channel);
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void ACMP_ChannelSet(ACMP_TypeDef *acmp, ACMP_Channel_TypeDef negSel, ACMP_Channel_TypeDef posSel);
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void ACMP_Disable(ACMP_TypeDef *acmp);
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void ACMP_Enable(ACMP_TypeDef *acmp);
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void ACMP_GPIOSetup(ACMP_TypeDef *acmp, uint32_t location, bool enable, bool invert);
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void ACMP_Init(ACMP_TypeDef *acmp, const ACMP_Init_TypeDef *init);
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void ACMP_Reset(ACMP_TypeDef *acmp);
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/***************************************************************************//**
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* @brief
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* Clear one or more pending ACMP interrupts.
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*
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* @param[in] acmp
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* Pointer to ACMP peripheral register block.
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*
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* @param[in] flags
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* Pending ACMP interrupt source to clear. Use a bitwise logic OR combination
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* of valid interrupt flags for the ACMP module (ACMP_IF_nnn).
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******************************************************************************/
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static __INLINE void ACMP_IntClear(ACMP_TypeDef *acmp, uint32_t flags)
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{
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acmp->IFC = flags;
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}
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/***************************************************************************//**
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* @brief
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* Disable one or more ACMP interrupts.
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*
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* @param[in] acmp
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* Pointer to ACMP peripheral register block.
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*
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* @param[in] flags
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* ACMP interrupt sources to disable. Use a bitwise logic OR combination of
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* valid interrupt flags for the ACMP module (ACMP_IF_nnn).
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******************************************************************************/
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static __INLINE void ACMP_IntDisable(ACMP_TypeDef *acmp, uint32_t flags)
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{
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acmp->IEN &= ~(flags);
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}
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/***************************************************************************//**
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* @brief
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* Enable one or more ACMP interrupts.
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*
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* @note
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* Depending on the use, a pending interrupt may already be set prior to
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* enabling the interrupt. Consider using ACMP_IntClear() prior to enabling
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* if such a pending interrupt should be ignored.
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*
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* @param[in] acmp
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* Pointer to ACMP peripheral register block.
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*
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* @param[in] flags
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* ACMP interrupt sources to enable. Use a bitwise logic OR combination of
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* valid interrupt flags for the ACMP module (ACMP_IF_nnn).
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******************************************************************************/
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static __INLINE void ACMP_IntEnable(ACMP_TypeDef *acmp, uint32_t flags)
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{
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acmp->IEN |= flags;
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}
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/***************************************************************************//**
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* @brief
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* Get pending ACMP interrupt flags.
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*
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* @note
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* The event bits are not cleared by the use of this function.
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*
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* @param[in] acmp
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* Pointer to ACMP peripheral register block.
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*
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* @return
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* ACMP interrupt sources pending. A bitwise logic OR combination of valid
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* interrupt flags for the ACMP module (ACMP_IF_nnn).
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******************************************************************************/
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static __INLINE uint32_t ACMP_IntGet(ACMP_TypeDef *acmp)
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{
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return(acmp->IF);
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}
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/***************************************************************************//**
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* @brief
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* Get enabled and pending ACMP interrupt flags.
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* Useful for handling more interrupt sources in the same interrupt handler.
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*
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* @param[in] usart
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* Pointer to ACMP peripheral register block.
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*
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* @note
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* Interrupt flags are not cleared by the use of this function.
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*
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* @return
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* Pending and enabled ACMP interrupt sources.
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* The return value is the bitwise AND combination of
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* - the OR combination of enabled interrupt sources in ACMPx_IEN_nnn
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* register (ACMPx_IEN_nnn) and
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* - the OR combination of valid interrupt flags of the ACMP module
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* (ACMPx_IF_nnn).
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******************************************************************************/
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static __INLINE uint32_t ACMP_IntGetEnabled(ACMP_TypeDef *acmp)
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{
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uint32_t tmp;
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/* Store ACMPx->IEN in temporary variable in order to define explicit order
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* of volatile accesses. */
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tmp = acmp->IEN;
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/* Bitwise AND of pending and enabled interrupts */
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return acmp->IF & tmp;
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}
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/***************************************************************************//**
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* @brief
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* Set one or more pending ACMP interrupts from SW.
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*
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* @param[in] acmp
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* Pointer to ACMP peripheral register block.
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*
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* @param[in] flags
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* ACMP interrupt sources to set to pending. Use a bitwise logic OR
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* combination of valid interrupt flags for the ACMP module (ACMP_IF_nnn).
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******************************************************************************/
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static __INLINE void ACMP_IntSet(ACMP_TypeDef *acmp, uint32_t flags)
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{
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acmp->IFS = flags;
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}
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/** @} (end addtogroup ACMP) */
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/** @} (end addtogroup EFM32_Library) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __EFM32_ACMP_H */
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