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/*
ChibiOS/HAL - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013,2014 Giovanni Di Sirio.
This file is part of ChibiOS/HAL
ChibiOS/HAL 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 for first front. */
ICU_ACTIVE = 4, /**< First front detected. */
} 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 Starts the input capture.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @iclass
*/
#define icuStartCaptureI(icup) do { \
icu_lld_start_capture(icup); \
icup->state = ICU_WAITING; \
} while (0)
/**
* @brief Stops the input capture.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @iclass
*/
#define icuStopCaptureI(icup) do { \
icu_lld_stop_capture(icup); \
icup->state = ICU_READY; \
} while (0)
/**
* @brief Enables notifications.
* @pre The ICU unit must have been activated using @p icuStart().
* @note If the notification is already enabled then the call has no effect.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @iclass
*/
#define icuEnableNotificationsI(icup) icu_lld_enable_notifications(icup)
/**
* @brief Disables notifications.
* @pre The ICU unit must have been activated using @p icuStart().
* @note If the notification is already disabled then the call has no effect.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @iclass
*/
#define icuDisableNotificationsI(icup) icu_lld_disable_notifications(icup)
/**
* @brief Check on notifications status.
*
* @param[in] icup pointer to the @p ICUDriver object
* @return The notifications status.
* @retval false if notifications are not enabled.
* @retval true if notifications are enabled.
*
* @notapi
*/
#define icuAreNotificationsEnabledX(icup) \
icu_lld_are_notifications_enabled(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.
*
* @param[in] icup pointer to the @p ICUDriver object
* @return The number of ticks.
*
* @xclass
*/
#define icuGetWidthX(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.
*
* @param[in] icup pointer to the @p ICUDriver object
* @return The number of ticks.
*
* @xclass
*/
#define icuGetPeriodX(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) do { \
if (((icup)->state == ICU_ACTIVE) && \
((icup)->config->width_cb != NULL)) \
(icup)->config->width_cb(icup); \
} while (0)
/**
* @brief Common ISR code, ICU period event.
* @note A period event brings the driver into the @p ICU_ACTIVE state.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
#define _icu_isr_invoke_period_cb(icup) do { \
if (((icup)->state == ICU_ACTIVE) && \
((icup)->config->period_cb != NULL)) \
(icup)->config->period_cb(icup); \
(icup)->state = ICU_ACTIVE; \
} while (0)
/**
* @brief Common ISR code, ICU timer overflow event.
* @note An overflow always brings the driver back to the @p ICU_WAITING
* state.
*
* @param[in] icup pointer to the @p ICUDriver object
*
* @notapi
*/
#define _icu_isr_invoke_overflow_cb(icup) do { \
(icup)->config->overflow_cb(icup); \
(icup)->state = ICU_WAITING; \
} while (0)
/** @} */
/*===========================================================================*/
/* 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 icuStartCapture(ICUDriver *icup);
bool icuWaitCapture(ICUDriver *icup);
void icuStopCapture(ICUDriver *icup);
void icuEnableNotifications(ICUDriver *icup);
void icuDisableNotifications(ICUDriver *icup);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_ICU */
#endif /* _ICU_H_ */
/** @} */
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