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/*
ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file icu.h
* @brief ICU Driver macros and structures.
*
* @addtogroup ICU
* @{
*/
#ifndef _ICU_H_
#define _ICU_H_
#if (HAL_USE_ICU == TRUE) || 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 (false)
/**
* @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 (false)
/**
* @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 == TRUE */
#endif /* _ICU_H_ */
/** @} */
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