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hathach
2018-02-07 23:32:49 +07:00
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nRF5_SDK_11.0.0_89a8197/components/libraries/timer/app_timer.c Normal file
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/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
/** @file
*
* @defgroup app_timer Application Timer
* @{
* @ingroup app_common
*
* @brief Application timer functionality.
*
* @details This module enables the application to create multiple timer instances based on the RTC1
* peripheral. Checking for time-outs and invokation of user time-out handlers is performed
* in the RTC1 interrupt handler. List handling is done using a software interrupt (SWI0).
* Both interrupt handlers are running in APP_LOW priority level.
*
* @details When calling app_timer_start() or app_timer_stop(), the timer operation is just queued,
* and the software interrupt is triggered. The actual timer start/stop operation is
* executed by the SWI0 interrupt handler. Since the SWI0 interrupt is running in APP_LOW,
* if the application code calling the timer function is running in APP_LOW or APP_HIGH,
* the timer operation will not be performed until the application handler has returned.
* This will be the case, for example, when stopping a timer from a time-out handler when not using
* the scheduler.
*
* @details Use the USE_SCHEDULER parameter of the APP_TIMER_INIT() macro to select if the
* @ref app_scheduler should be used or not. Even if the scheduler is
* not used, app_timer.h will include app_scheduler.h, so when
* compiling, app_scheduler.h must be available in one of the compiler include paths.
*/
#ifndef APP_TIMER_H__
#define APP_TIMER_H__
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include "app_error.h"
#include "app_util.h"
#include "compiler_abstraction.h"
#define APP_TIMER_CLOCK_FREQ 32768 /**< Clock frequency of the RTC timer used to implement the app timer module. */
#define APP_TIMER_MIN_TIMEOUT_TICKS 5 /**< Minimum value of the timeout_ticks parameter of app_timer_start(). */
#define APP_TIMER_NODE_SIZE 32 /**< Size of app_timer.timer_node_t (used to allocate data). */
#define APP_TIMER_USER_OP_SIZE 24 /**< Size of app_timer.timer_user_op_t (only for use inside APP_TIMER_BUF_SIZE()). */
#define APP_TIMER_USER_SIZE 8 /**< Size of app_timer.timer_user_t (only for use inside APP_TIMER_BUF_SIZE()). */
#define APP_TIMER_INT_LEVELS 3 /**< Number of interrupt levels from where timer operations may be initiated (only for use inside APP_TIMER_BUF_SIZE()). */
/**@brief Compute number of bytes required to hold the application timer data structures.
*
* @param[in] OP_QUEUE_SIZE Size of queues holding timer operations that are pending execution.
* Note that due to the queue implementation, this size must be one more
* than the size that is actually needed.
*
* @return Required application timer buffer size (in bytes).
*/
#define APP_TIMER_BUF_SIZE(OP_QUEUE_SIZE) \
( \
( \
APP_TIMER_INT_LEVELS \
* \
(APP_TIMER_USER_SIZE + ((OP_QUEUE_SIZE) + 1) * APP_TIMER_USER_OP_SIZE) \
) \
)
/**@brief Convert milliseconds to timer ticks.
*
* This macro uses 64-bit integer arithmetic, but as long as the macro parameters are
* constants (i.e. defines), the computation will be done by the preprocessor.
*
* When using this macro, ensure that the
* values provided as input result in an output value that is supported by the
* @ref app_timer_start function. For example, when the ticks for 1 ms is needed, the
* maximum possible value of PRESCALER must be 6, when @ref APP_TIMER_CLOCK_FREQ is 32768.
* This will result in a ticks value as 5. Any higher value for PRESCALER will result in a
* ticks value that is not supported by this module.
*
* @param[in] MS Milliseconds.
* @param[in] PRESCALER Value of the RTC1 PRESCALER register (must be the same value that was
* passed to APP_TIMER_INIT()).
*
* @return Number of timer ticks.
*/
#define APP_TIMER_TICKS(MS, PRESCALER)\
((uint32_t)ROUNDED_DIV((MS) * (uint64_t)APP_TIMER_CLOCK_FREQ, ((PRESCALER) + 1) * 1000))
typedef struct app_timer_t { uint32_t data[CEIL_DIV(APP_TIMER_NODE_SIZE, sizeof(uint32_t))]; } app_timer_t;
/**@brief Timer ID type.
* Never declare a variable of this type, but use the macro @ref APP_TIMER_DEF instead.*/
typedef app_timer_t * app_timer_id_t;
/**
* @brief Create a timer identifier and statically allocate memory for the timer.
*
* @param timer_id Name of the timer identifier variable that will be used to control the timer.
*/
#define APP_TIMER_DEF(timer_id) \
static app_timer_t timer_id##_data = { {0} }; \
static const app_timer_id_t timer_id = &timer_id##_data
/**@brief Application time-out handler type. */
typedef void (*app_timer_timeout_handler_t)(void * p_context);
/**@brief Type of function for passing events from the timer module to the scheduler. */
typedef uint32_t (*app_timer_evt_schedule_func_t) (app_timer_timeout_handler_t timeout_handler,
void * p_context);
/**@brief Timer modes. */
typedef enum
{
APP_TIMER_MODE_SINGLE_SHOT, /**< The timer will expire only once. */
APP_TIMER_MODE_REPEATED /**< The timer will restart each time it expires. */
} app_timer_mode_t;
/**@brief Initialize the application timer module.
*
* @details This macro handles dimensioning and allocation of the memory buffer required by the timer,
* making sure that the buffer is correctly aligned. It will also connect the timer module
* to the scheduler (if specified).
*
* @note This module assumes that the LFCLK is already running. If it is not, the module will
* be non-functional, since the RTC will not run. If you do not use a SoftDevice, you
* must start the LFCLK manually. See the rtc_example's lfclk_config() function
* for an example of how to do this. If you use a SoftDevice, the LFCLK is started on
* SoftDevice init.
*
*
* @param[in] PRESCALER Value of the RTC1 PRESCALER register. This will decide the
* timer tick rate. Set to 0 for no prescaling.
* @param[in] OP_QUEUES_SIZE Size of queues holding timer operations that are pending execution.
* @param[in] SCHEDULER_FUNC Pointer to scheduler event handler
*
* @note Since this macro allocates a buffer, it must only be called once (it is OK to call it
* several times as long as it is from the same location, for example, to do a re-initialization).
*/
/*lint -emacro(506, APP_TIMER_INIT) */ /* Suppress "Constant value Boolean */
#define APP_TIMER_INIT(PRESCALER, OP_QUEUES_SIZE, SCHEDULER_FUNC) \
do \
{ \
static uint32_t APP_TIMER_BUF[CEIL_DIV(APP_TIMER_BUF_SIZE((OP_QUEUES_SIZE) + 1), \
sizeof(uint32_t))]; \
uint32_t ERR_CODE = app_timer_init((PRESCALER), \
(OP_QUEUES_SIZE) + 1, \
APP_TIMER_BUF, \
SCHEDULER_FUNC); \
APP_ERROR_CHECK(ERR_CODE); \
} while (0)
/**@brief Function for initializing the timer module.
*
* Normally, initialization should be done using the APP_TIMER_INIT() macro, because that macro will both
* allocate the buffers needed by the timer module (including aligning the buffers correctly)
* and take care of connecting the timer module to the scheduler (if specified).
*
* @param[in] prescaler Value of the RTC1 PRESCALER register. Set to 0 for no prescaling.
* @param[in] op_queues_size Size of queues holding timer operations that are pending
* execution. Note that due to the queue implementation, this size must
* be one more than the size that is actually needed.
* @param[in] p_buffer Pointer to memory buffer for internal use in the app_timer
* module. The size of the buffer can be computed using the
* APP_TIMER_BUF_SIZE() macro. The buffer must be aligned to a
* 4 byte boundary.
* @param[in] evt_schedule_func Function for passing time-out events to the scheduler. Point to
* app_timer_evt_schedule() to connect to the scheduler. Set to NULL
* to make the timer module call the time-out handler directly from
* the timer interrupt handler.
*
* @retval NRF_SUCCESS If the module was initialized successfully.
* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid (buffer not aligned to a 4 byte
* boundary or NULL).
*/
uint32_t app_timer_init(uint32_t prescaler,
uint8_t op_queues_size,
void * p_buffer,
app_timer_evt_schedule_func_t evt_schedule_func);
/**@brief Function for creating a timer instance.
*
* @param[in] p_timer_id Pointer to timer identifier.
* @param[in] mode Timer mode.
* @param[in] timeout_handler Function to be executed when the timer expires.
*
* @retval NRF_SUCCESS If the timer was successfully created.
* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or
* the timer is running.
*
* @note This function does the timer allocation in the caller's context. It is also not protected
* by a critical region. Therefore care must be taken not to call it from several interrupt
* levels simultaneously.
* @note The function can be called again on the timer instance and will re-initialize the instance if
* the timer is not running.
* @attention The FreeRTOS and RTX app_timer implementation does not allow app_timer_create to
* be called on the previously initialized instance.
*/
uint32_t app_timer_create(app_timer_id_t const * p_timer_id,
app_timer_mode_t mode,
app_timer_timeout_handler_t timeout_handler);
/**@brief Function for starting a timer.
*
* @param[in] timer_id Timer identifier.
* @param[in] timeout_ticks Number of ticks (of RTC1, including prescaling) to time-out event
* (minimum 5 ticks).
* @param[in] p_context General purpose pointer. Will be passed to the time-out handler when
* the timer expires.
*
* @retval NRF_SUCCESS If the timer was successfully started.
* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer
* has not been created.
* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
*
* @note The minimum timeout_ticks value is 5.
* @note For multiple active timers, time-outs occurring in close proximity to each other (in the
* range of 1 to 3 ticks) will have a positive jitter of maximum 3 ticks.
* @note When calling this method on a timer that is already running, the second start operation
* is ignored.
*/
uint32_t app_timer_start(app_timer_id_t timer_id, uint32_t timeout_ticks, void * p_context);
/**@brief Function for stopping the specified timer.
*
* @param[in] timer_id Timer identifier.
*
* @retval NRF_SUCCESS If the timer was successfully stopped.
* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer
* has not been created.
* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
*/
uint32_t app_timer_stop(app_timer_id_t timer_id);
/**@brief Function for stopping all running timers.
*
* @retval NRF_SUCCESS If all timers were successfully stopped.
* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized.
* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
*/
uint32_t app_timer_stop_all(void);
/**@brief Function for returning the current value of the RTC1 counter.
*
* @param[out] p_ticks Current value of the RTC1 counter.
*
* @retval NRF_SUCCESS If the counter was successfully read.
*/
uint32_t app_timer_cnt_get(uint32_t * p_ticks);
/**@brief Function for computing the difference between two RTC1 counter values.
*
* @param[in] ticks_to Value returned by app_timer_cnt_get().
* @param[in] ticks_from Value returned by app_timer_cnt_get().
* @param[out] p_ticks_diff Number of ticks from ticks_from to ticks_to.
*
* @retval NRF_SUCCESS If the counter difference was successfully computed.
*/
uint32_t app_timer_cnt_diff_compute(uint32_t ticks_to,
uint32_t ticks_from,
uint32_t * p_ticks_diff);
#ifdef APP_TIMER_WITH_PROFILER
/**@brief Function for getting the maximum observed operation queue utilization.
*
* Function for tuning the module and determining OP_QUEUE_SIZE value and thus module RAM usage.
*
* @return Maximum number of events in queue observed so far.
*/
uint16_t app_timer_op_queue_utilization_get(void);
#endif
#endif // APP_TIMER_H__
/** @} */

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/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
#include "app_timer_appsh.h"
#include "app_scheduler.h"
static void app_timer_evt_get(void * p_event_data, uint16_t event_size)
{
app_timer_event_t * p_timer_event = (app_timer_event_t *)p_event_data;
APP_ERROR_CHECK_BOOL(event_size == sizeof(app_timer_event_t));
p_timer_event->timeout_handler(p_timer_event->p_context);
}
uint32_t app_timer_evt_schedule(app_timer_timeout_handler_t timeout_handler,
void * p_context)
{
app_timer_event_t timer_event;
timer_event.timeout_handler = timeout_handler;
timer_event.p_context = p_context;
return app_sched_event_put(&timer_event, sizeof(timer_event), app_timer_evt_get);
}

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/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
*
* Licensees are granted free, non-transferable use of the information. NO
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
* the file.
*
*/
#ifndef APP_TIMER_APPSH_H
#define APP_TIMER_APPSH_H
#include "app_timer.h"
#define APP_TIMER_SCHED_EVT_SIZE sizeof(app_timer_event_t) /**< Size of button events being passed through the scheduler (is to be used for computing the maximum size of scheduler events). */
/**@brief Macro for initializing the application timer module to use with app_scheduler.
*
* @param[in] PRESCALER Value of the RTC1 PRESCALER register. This will decide the
* timer tick rate. Set to 0 for no prescaling.
* @param[in] OP_QUEUES_SIZE Size of queues holding timer operations that are pending execution.
* @param[in] USE_SCHEDULER TRUE if the application is using the app_scheduler,
* FALSE otherwise.
*
* @note Since this macro allocates a buffer, it must only be called once (it is OK to call it
* several times as long as it is from the same location, e.g. to do a reinitialization).
*/
#define APP_TIMER_APPSH_INIT(PRESCALER, OP_QUEUES_SIZE, USE_SCHEDULER) \
APP_TIMER_INIT(PRESCALER, OP_QUEUES_SIZE, \
(USE_SCHEDULER) ? app_timer_evt_schedule : NULL)
typedef struct
{
app_timer_timeout_handler_t timeout_handler;
void * p_context;
} app_timer_event_t;
uint32_t app_timer_evt_schedule(app_timer_timeout_handler_t timeout_handler,
void * p_context);
#endif // APP_TIMER_APPSH_H