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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file icu.h
* @brief ICU Driver macros and structures.
*
* @addtogroup ICU
* @{
*/
#ifndef _ICU_H_
#define _ICU_H_
#if HAL_USE_ICU || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
ICU_UNINIT = 0, /**< Not initialized. */
ICU_STOP = 1, /**< Stopped. */
ICU_READY = 2, /**< Ready. */
ICU_WAITING = 3, /**< Waiting first edge. */
ICU_ACTIVE = 4, /**< Active cycle phase. */
ICU_IDLE = 5, /**< Idle cycle phase. */
} icustate_t;
/**
* @brief Type of a structure representing an ICU driver.
*/
typedef struct ICUDriver ICUDriver;
/**
* @brief ICU notification callback type.
*
* @param[in] icup pointer to a @p ICUDriver object
*/
typedef void (*icucallback_t)(ICUDriver *icup);
#include "icu_lld.h"
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @name Macro Functions
* @{
*/
/**
* @brief Enables the input capture.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @iclass
*/
#define icuEnableI(icup) icu_lld_enable(icup)
/**
* @brief Disables the input capture.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @iclass
*/
#define icuDisableI(icup) icu_lld_disable(icup)
/**
* @brief Returns the width of the latest pulse.
* @details The pulse width is defined as number of ticks between the start
* edge and the stop edge.
* @note This function is meant to be invoked from the width capture
* callback only.
*
* @param[in] icup pointer to the @p ICUDriver object
* @return The number of ticks.
*
* @special
*/
#define icuGetWidth(icup) icu_lld_get_width(icup)
/**
* @brief Returns the width of the latest cycle.
* @details The cycle width is defined as number of ticks between a start
* edge and the next start edge.
* @note This function is meant to be invoked from the width capture
* callback only.
*
* @param[in] icup pointer to the @p ICUDriver object
* @return The number of ticks.
*
* @special
*/
#define icuGetPeriod(icup) icu_lld_get_period(icup)
/** @} */
/**
* @name Low Level driver helper macros
* @{
*/
/**
* @brief Common ISR code, ICU width event.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
#define _icu_isr_invoke_width_cb(icup) { \
(icup)->state = ICU_IDLE; \
(icup)->config->width_cb(icup); \
}
/**
* @brief Common ISR code, ICU period event.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
#define _icu_isr_invoke_period_cb(icup) { \
icustate_t previous_state = (icup)->state; \
(icup)->state = ICU_ACTIVE; \
if (previous_state != ICU_WAITING) \
(icup)->config->period_cb(icup); \
}
/** @} */
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void icuInit(void);
void icuObjectInit(ICUDriver *icup);
void icuStart(ICUDriver *icup, const ICUConfig *config);
void icuStop(ICUDriver *icup);
void icuEnable(ICUDriver *icup);
void icuDisable(ICUDriver *icup);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_ICU */
#endif /* _ICU_H_ */
/** @} */
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