330 lines
11 KiB
C
330 lines
11 KiB
C
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/***************************************************************************//**
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* @file
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* @brief Pulse Counter (PCNT) peripheral API for EFM32.
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* @author Energy Micro AS
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* @version 1.3.0
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2010 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_PCNT_H
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#define __EFM32_PCNT_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 PCNT
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* @{
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******************************************************************************/
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/*******************************************************************************
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******************************* DEFINES ***********************************
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******************************************************************************/
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/** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
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/** PCNT counter width mask. */
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/* TBD: Remove use with efm32 include file defines when corrected */
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#define PCNT_WIDTH_MASK 0xff
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/** @endcond (DO_NOT_INCLUDE_WITH_DOXYGEN) */
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/*******************************************************************************
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******************************** ENUMS ************************************
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******************************************************************************/
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/** Mode selection. */
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typedef enum
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{
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/** Disable pulse counter. */
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pcntModeDisable = _PCNT_CTRL_MODE_DISABLE,
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/** Single input LFACLK oversampling mode (available in EM0-EM2). */
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pcntModeOvsSingle = _PCNT_CTRL_MODE_OVSSINGLE,
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/** Externally clocked single input counter mode (available in EM0-EM3). */
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pcntModeExtSingle = _PCNT_CTRL_MODE_EXTCLKSINGLE,
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/** Externally clocked quadrature decoder mode (available in EM0-EM3). */
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pcntModeExtQuad = _PCNT_CTRL_MODE_EXTCLKQUAD
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} PCNT_Mode_TypeDef;
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/*******************************************************************************
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******************************* STRUCTS ***********************************
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******************************************************************************/
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/** Init structure. */
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typedef struct
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{
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/** Mode to operate in. */
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PCNT_Mode_TypeDef mode;
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/**
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* Initial counter value (refer to reference manual for max value allowed).
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* Only used for #pcntModeOvsSingle (and possibly #pcntModeDisable) modes.
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* If using #pcntModeExtSingle or #pcntModeExtQuad modes, the counter
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* value is reset to HW reset value.
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*/
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uint32_t counter;
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/**
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* Initial top value (refer to reference manual for max value allowed).
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* Only used for #pcntModeOvsSingle (and possibly #pcntModeDisable) modes.
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* If using #pcntModeExtSingle or #pcntModeExtQuad modes, the top
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* value is reset to HW reset value.
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*/
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uint32_t top;
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/**
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* Polarity of incoming edge.
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* @li #pcntModeExtSingle mode - if false, positive edges are counted,
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* otherwise negative edges.
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* @li #pcntModeExtQuad mode - if true, counting direction is inverted.
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*/
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bool negEdge;
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/**
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* Counting direction, only applicable for #pcntModeOvsSingle and
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* #pcntModeExtSingle modes.
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*/
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bool countDown;
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/** Enable filter, only available in #pcntModeOvsSingle mode. */
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bool filter;
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} PCNT_Init_TypeDef;
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/** Default config for PCNT init structure. */
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/* TBD: Remove PCNT_WIDTH_MASK use when _PCNT_TOP_RESETVALUE corrected */
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#define PCNT_INIT_DEFAULT \
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{ pcntModeDisable, /* Disabled by default. */ \
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_PCNT_CNT_RESETVALUE, /* Default counter HW reset value. */ \
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_PCNT_TOP_RESETVALUE & PCNT_WIDTH_MASK, /* Default counter HW reset value. */ \
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false, /* Use positive edge. */ \
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false, /* Up-counting. */ \
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false /* Filter disabled. */ \
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}
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/*******************************************************************************
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***************************** PROTOTYPES **********************************
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******************************************************************************/
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/***************************************************************************//**
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* @brief
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* Get pulse counter value.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @return
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* Current pulse counter value.
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******************************************************************************/
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static __INLINE uint32_t PCNT_CounterGet(PCNT_TypeDef *pcnt)
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{
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return(pcnt->CNT);
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}
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void PCNT_CounterReset(PCNT_TypeDef *pcnt);
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void PCNT_CounterTopSet(PCNT_TypeDef *pcnt, uint32_t count, uint32_t top);
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/***************************************************************************//**
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* @brief
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* Set counter value.
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*
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* @details
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* The pulse counter is disabled while changing counter value, and reenabled
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* (if originally enabled) when counter value has been set.
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*
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* @note
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* This function will stall until synchronization to low frequency domain is
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* completed. For that reason, it should normally not be used when using
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* an external clock to clock the PCNT module, since stall time may be
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* undefined in that case. The counter should normally only be set when
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* operating in (or about to enable) #pcntModeOvsSingle mode.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @param[in] count
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* Value to set in counter register.
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******************************************************************************/
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static __INLINE void PCNT_CounterSet(PCNT_TypeDef *pcnt, uint32_t count)
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{
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PCNT_CounterTopSet(pcnt, count, pcnt->TOP);
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}
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void PCNT_Enable(PCNT_TypeDef *pcnt, PCNT_Mode_TypeDef mode);
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void PCNT_FreezeEnable(PCNT_TypeDef *pcnt, bool enable);
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void PCNT_Init(PCNT_TypeDef *pcnt, PCNT_Init_TypeDef *init);
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/***************************************************************************//**
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* @brief
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* Clear one or more pending PCNT interrupts.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @param[in] flags
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* Pending PCNT interrupt source to clear. Use a logical OR combination
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* of valid interrupt flags for the PCNT module (PCNT_IF_nnn).
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******************************************************************************/
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static __INLINE void PCNT_IntClear(PCNT_TypeDef *pcnt, uint32_t flags)
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{
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pcnt->IFC = flags;
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}
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/***************************************************************************//**
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* @brief
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* Disable one or more PCNT interrupts.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @param[in] flags
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* PCNT interrupt sources to disable. Use a logical OR combination of
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* valid interrupt flags for the PCNT module (PCNT_IF_nnn).
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******************************************************************************/
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static __INLINE void PCNT_IntDisable(PCNT_TypeDef *pcnt, uint32_t flags)
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{
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pcnt->IEN &= ~(flags);
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}
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/***************************************************************************//**
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* @brief
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* Enable one or more PCNT 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 PCNT_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] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @param[in] flags
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* PCNT interrupt sources to enable. Use a logical OR combination of
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* valid interrupt flags for the PCNT module (PCNT_IF_nnn).
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******************************************************************************/
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static __INLINE void PCNT_IntEnable(PCNT_TypeDef *pcnt, uint32_t flags)
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{
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pcnt->IEN |= flags;
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}
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/***************************************************************************//**
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* @brief
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* Get pending PCNT 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] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @return
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* PCNT interrupt sources pending. A logical OR combination of valid
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* interrupt flags for the PCNT module (PCNT_IF_nnn).
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******************************************************************************/
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static __INLINE uint32_t PCNT_IntGet(PCNT_TypeDef *pcnt)
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{
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return(pcnt->IF);
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}
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/***************************************************************************//**
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* @brief
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* Set one or more pending PCNT interrupts from SW.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @param[in] flags
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* PCNT interrupt sources to set to pending. Use a logical OR combination
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* of valid interrupt flags for the PCNT module (PCNT_IF_nnn).
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******************************************************************************/
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static __INLINE void PCNT_IntSet(PCNT_TypeDef *pcnt, uint32_t flags)
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{
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pcnt->IFS = flags;
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}
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void PCNT_Reset(PCNT_TypeDef *pcnt);
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/***************************************************************************//**
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* @brief
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* Get pulse counter top buffer value.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @return
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* Current pulse counter top buffer value.
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******************************************************************************/
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static __INLINE uint32_t PCNT_TopBufferGet(PCNT_TypeDef *pcnt)
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{
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return(pcnt->TOPB);
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}
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void PCNT_TopBufferSet(PCNT_TypeDef *pcnt, uint32_t val);
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/***************************************************************************//**
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* @brief
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* Get pulse counter top value.
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*
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* @param[in] pcnt
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* Pointer to PCNT peripheral register block.
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*
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* @return
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* Current pulse counter top value.
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******************************************************************************/
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static __INLINE uint32_t PCNT_TopGet(PCNT_TypeDef *pcnt)
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{
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return(pcnt->TOP);
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}
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void PCNT_TopSet(PCNT_TypeDef *pcnt, uint32_t val);
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/** @} (end addtogroup PCNT) */
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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_PCNT_H */
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