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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 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/>.
*/
/*
Concepts and parts of this file have been contributed by Fabio Utzig and
Xo Wang.
*/
/**
* @file templates/icu_lld.h
* @brief ICU Driver subsystem low level driver header template.
*
* @addtogroup ICU
* @{
*/
#ifndef _ICU_LLD_H_
#define _ICU_LLD_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 ICU driver mode.
*/
typedef enum {
ICU_INPUT_ACTIVE_HIGH = 0, /**< Trigger on rising edge. */
ICU_INPUT_ACTIVE_LOW = 1, /**< Trigger on falling edge. */
} icumode_t;
/**
* @brief ICU frequency type.
*/
typedef uint32_t icufreq_t;
/**
* @brief ICU counter type.
*/
typedef uint16_t icucnt_t;
/**
* @brief Driver configuration structure.
* @note It could be empty on some architectures.
*/
typedef struct {
/**
* @brief Driver mode.
*/
icumode_t mode;
/**
* @brief Timer clock in Hz.
* @note The low level can use assertions in order to catch invalid
* frequency specifications.
*/
icufreq_t frequency;
/**
* @brief Callback for pulse width measurement.
*/
icucallback_t width_cb;
/**
* @brief Callback for cycle period measurement.
*/
icucallback_t period_cb;
/**
* @brief Callback for timer overflow.
*/
icucallback_t overflow_cb;
/* End of the mandatory fields.*/
} ICUConfig;
/**
* @brief Structure representing an ICU driver.
*/
struct ICUDriver {
/**
* @brief Driver state.
*/
icustate_t state;
/**
* @brief Current configuration data.
*/
const ICUConfig *config;
#if defined(ICU_DRIVER_EXT_FIELDS)
ICU_DRIVER_EXT_FIELDS
#endif
/* End of the mandatory fields.*/
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void icu_lld_init(void);
void icu_lld_start(ICUDriver *icup);
void icu_lld_stop(ICUDriver *icup);
void icu_lld_enable(ICUDriver *icup);
void icu_lld_disable(ICUDriver *icup);
icucnt_t icu_lld_get_width(ICUDriver *icup);
icucnt_t icu_lld_get_period(ICUDriver *icup);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_ICU */
#endif /* _ICU_LLD_H_ */
/** @} */
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