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194 lines
5.7 KiB
C
194 lines
5.7 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file hal_icu_lld.h
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* @brief PLATFORM ICU subsystem low level driver header.
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*
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* @addtogroup ICU
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* @{
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*/
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#ifndef HAL_ICU_LLD_H
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#define HAL_ICU_LLD_H
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#if (HAL_USE_ICU == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @name PLATFORM configuration options
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* @{
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*/
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/**
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* @brief ICUD1 driver enable switch.
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* @details If set to @p TRUE the support for ICUD1 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(PLATFORM_ICU_USE_ICU1) || defined(__DOXYGEN__)
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#define PLATFORM_ICU_USE_ICU1 FALSE
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#endif
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/** @} */
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief ICU driver mode.
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*/
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typedef enum {
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ICU_INPUT_ACTIVE_HIGH = 0, /**< Trigger on rising edge. */
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ICU_INPUT_ACTIVE_LOW = 1 /**< Trigger on falling edge. */
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} icumode_t;
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/**
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* @brief ICU frequency type.
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*/
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typedef uint32_t icufreq_t;
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/**
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* @brief ICU counter type.
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*/
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typedef uint32_t icucnt_t;
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/**
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* @brief Driver configuration structure.
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* @note It could be empty on some architectures.
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*/
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typedef struct {
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/**
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* @brief Driver mode.
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*/
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icumode_t mode;
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/**
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* @brief Timer clock in Hz.
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* @note The low level can use assertions in order to catch invalid
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* frequency specifications.
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*/
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icufreq_t frequency;
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/**
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* @brief Callback for pulse width measurement.
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*/
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icucallback_t width_cb;
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/**
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* @brief Callback for cycle period measurement.
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*/
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icucallback_t period_cb;
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/**
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* @brief Callback for timer overflow.
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*/
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icucallback_t overflow_cb;
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/* End of the mandatory fields.*/
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} ICUConfig;
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/**
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* @brief Structure representing an ICU driver.
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*/
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struct ICUDriver {
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/**
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* @brief Driver state.
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*/
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icustate_t state;
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/**
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* @brief Current configuration data.
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*/
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const ICUConfig *config;
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#if defined(ICU_DRIVER_EXT_FIELDS)
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ICU_DRIVER_EXT_FIELDS
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#endif
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/* End of the mandatory fields.*/
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};
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @brief Returns the width of the latest pulse.
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* @details The pulse width is defined as number of ticks between the start
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* edge and the stop edge.
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*
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* @param[in] icup pointer to the @p ICUDriver object
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* @return The number of ticks.
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*
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* @notapi
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*/
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#define icu_lld_get_width(icup) 0
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/**
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* @brief Returns the width of the latest cycle.
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* @details The cycle width is defined as number of ticks between a start
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* edge and the next start edge.
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*
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* @param[in] icup pointer to the @p ICUDriver object
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* @return The number of ticks.
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*
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* @notapi
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*/
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#define icu_lld_get_period(icup) 0
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/**
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* @brief Check on notifications status.
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*
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* @param[in] icup pointer to the @p ICUDriver object
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* @return The notifications status.
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* @retval false if notifications are not enabled.
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* @retval true if notifications are enabled.
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*
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* @notapi
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*/
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#define icu_lld_are_notifications_enabled(icup) false
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if (PLATFORM_ICU_USE_ICU1 == TRUE) && !defined(__DOXYGEN__)
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extern ICUDriver ICUD1;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void icu_lld_init(void);
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void icu_lld_start(ICUDriver *icup);
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void icu_lld_stop(ICUDriver *icup);
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void icu_lld_start_capture(ICUDriver *icup);
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bool icu_lld_wait_capture(ICUDriver *icup);
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void icu_lld_stop_capture(ICUDriver *icup);
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void icu_lld_enable_notifications(ICUDriver *icup);
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void icu_lld_disable_notifications(ICUDriver *icup);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_ICU == TRUE */
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#endif /* HAL_ICU_LLD_H */
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/** @} */
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