196 lines
7.0 KiB
C
196 lines
7.0 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_oneshot.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_STM32_STM32_ONESHOT_H
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#define __ARCH_ARM_SRC_STM32_STM32_ONESHOT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <nuttx/irq.h>
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#include "stm32_tim.h"
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#ifdef CONFIG_STM32_ONESHOT
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if !defined(CONFIG_STM32_ONESHOT_MAXTIMERS) || \
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CONFIG_STM32_ONESHOT_MAXTIMERS < 1
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# undef CONFIG_STM32_ONESHOT_MAXTIMERS
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# define CONFIG_STM32_ONESHOT_MAXTIMERS 1
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#endif
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#if CONFIG_STM32_ONESHOT_MAXTIMERS > 8
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# warning Additional logic required to handle more than 8 timers
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# undef CONFIG_STM32_ONESHOT_MAXTIMERS
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# define CONFIG_STM32_ONESHOT_MAXTIMERS 8
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This describes the callback function that will be invoked when the oneshot
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* timer expires. The oneshot fires, the client will receive:
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*
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* arg - The opaque argument provided when the interrupt was registered
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*/
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typedef void (*oneshot_handler_t)(void *arg);
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/* The oneshot client must allocate an instance of this structure and called
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* stm32_oneshot_initialize() before using the oneshot facilities. The
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* client should not access the contents of this structure directly since
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* the contents are subject to change.
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*/
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struct stm32_oneshot_s
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{
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uint8_t chan; /* The timer/counter in use */
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#if CONFIG_STM32_ONESHOT_MAXTIMERS > 1
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uint8_t cbndx; /* Timer callback handler index */
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#endif
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volatile bool running; /* True: the timer is running */
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struct stm32_tim_dev_s *tch; /* Pointer returned by
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* stm32_tim_init() */
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volatile oneshot_handler_t handler; /* Oneshot expiration callback */
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volatile void *arg; /* The argument that will accompany
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* the callback */
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uint32_t frequency;
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uint32_t period;
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_oneshot_initialize
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*
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* Description:
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* Initialize the oneshot timer wrapper
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*
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* Input Parameters:
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* oneshot Caller allocated instance of the oneshot state structure
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* chan Timer counter channel to be used.
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* resolution The required resolution of the timer in units of
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* microseconds. NOTE that the range is restricted to the
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* range of uint16_t (excluding zero).
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int stm32_oneshot_initialize(struct stm32_oneshot_s *oneshot, int chan,
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uint16_t resolution);
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/****************************************************************************
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* Name: stm32_oneshot_max_delay
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*
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* Description:
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* Determine the maximum delay of the one-shot timer (in microseconds)
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*
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****************************************************************************/
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int stm32_oneshot_max_delay(struct stm32_oneshot_s *oneshot, uint64_t *usec);
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/****************************************************************************
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* Name: stm32_oneshot_start
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*
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* Description:
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* Start the oneshot timer
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*
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* Input Parameters:
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* oneshot Caller allocated instance of the oneshot state structure. This
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* structure must have been previously initialized via a call to
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* stm32_oneshot_initialize();
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* handler The function to call when when the oneshot timer expires.
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* arg An opaque argument that will accompany the callback.
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* ts Provides the duration of the one shot timer.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned
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* on failure.
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*
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****************************************************************************/
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int stm32_oneshot_start(struct stm32_oneshot_s *oneshot,
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oneshot_handler_t handler, void *arg,
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const struct timespec *ts);
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/****************************************************************************
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* Name: stm32_oneshot_cancel
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*
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* Description:
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* Cancel the oneshot timer and return the time remaining on the timer.
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*
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* NOTE: This function may execute at a high rate with no timer running (as
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* when pre-emption is enabled and disabled).
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*
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* Input Parameters:
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* oneshot Caller allocated instance of the oneshot state structure. This
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* structure must have been previously initialized via a call to
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* stm32_oneshot_initialize();
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* ts The location in which to return the time remaining on the
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* oneshot timer. A time of zero is returned if the timer is
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* not running.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A call to up_timer_cancel() when
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* the timer is not active should also return success; a negated errno
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* value is returned on any failure.
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*
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****************************************************************************/
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int stm32_oneshot_cancel(struct stm32_oneshot_s *oneshot,
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struct timespec *ts);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_STM32_ONESHOT */
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#endif /* __ARCH_ARM_SRC_STM32_STM32_ONESHOT_H */
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