164 lines
7.1 KiB
C
164 lines
7.1 KiB
C
/* 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_scheduler Scheduler
|
|
* @{
|
|
* @ingroup app_common
|
|
*
|
|
* @brief The scheduler is used for transferring execution from the interrupt context to the main
|
|
* context.
|
|
*
|
|
* @details See @ref seq_diagrams_sched for sequence diagrams illustrating the flow of events
|
|
* when using the Scheduler.
|
|
*
|
|
* @section app_scheduler_req Requirements:
|
|
*
|
|
* @subsection main_context_logic Logic in main context:
|
|
*
|
|
* - Define an event handler for each type of event expected.
|
|
* - Initialize the scheduler by calling the APP_SCHED_INIT() macro before entering the
|
|
* application main loop.
|
|
* - Call app_sched_execute() from the main loop each time the application wakes up because of an
|
|
* event (typically when sd_app_evt_wait() returns).
|
|
*
|
|
* @subsection int_context_logic Logic in interrupt context:
|
|
*
|
|
* - In the interrupt handler, call app_sched_event_put()
|
|
* with the appropriate data and event handler. This will insert an event into the
|
|
* scheduler's queue. The app_sched_execute() function will pull this event and call its
|
|
* handler in the main context.
|
|
*
|
|
* @if (PERIPHERAL)
|
|
* For an example usage of the scheduler, see the implementations of
|
|
* @ref ble_sdk_app_hids_mouse and @ref ble_sdk_app_hids_keyboard.
|
|
* @endif
|
|
*
|
|
* @image html scheduler_working.jpg The high level design of the scheduler
|
|
*/
|
|
|
|
#ifndef APP_SCHEDULER_H__
|
|
#define APP_SCHEDULER_H__
|
|
|
|
#include <stdint.h>
|
|
#include "app_error.h"
|
|
#include "app_util.h"
|
|
|
|
#define APP_SCHED_EVENT_HEADER_SIZE 8 /**< Size of app_scheduler.event_header_t (only for use inside APP_SCHED_BUF_SIZE()). */
|
|
|
|
/**@brief Compute number of bytes required to hold the scheduler buffer.
|
|
*
|
|
* @param[in] EVENT_SIZE Maximum size of events to be passed through the scheduler.
|
|
* @param[in] QUEUE_SIZE Number of entries in scheduler queue (i.e. the maximum number of events
|
|
* that can be scheduled for execution).
|
|
*
|
|
* @return Required scheduler buffer size (in bytes).
|
|
*/
|
|
#define APP_SCHED_BUF_SIZE(EVENT_SIZE, QUEUE_SIZE) \
|
|
(((EVENT_SIZE) + APP_SCHED_EVENT_HEADER_SIZE) * ((QUEUE_SIZE) + 1))
|
|
|
|
/**@brief Scheduler event handler type. */
|
|
typedef void (*app_sched_event_handler_t)(void * p_event_data, uint16_t event_size);
|
|
|
|
/**@brief Macro for initializing the event scheduler.
|
|
*
|
|
* @details It will also handle dimensioning and allocation of the memory buffer required by the
|
|
* scheduler, making sure the buffer is correctly aligned.
|
|
*
|
|
* @param[in] EVENT_SIZE Maximum size of events to be passed through the scheduler.
|
|
* @param[in] QUEUE_SIZE Number of entries in scheduler queue (i.e. the maximum number of events
|
|
* that can be scheduled for execution).
|
|
*
|
|
* @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_SCHED_INIT(EVENT_SIZE, QUEUE_SIZE) \
|
|
do \
|
|
{ \
|
|
static uint32_t APP_SCHED_BUF[CEIL_DIV(APP_SCHED_BUF_SIZE((EVENT_SIZE), (QUEUE_SIZE)), \
|
|
sizeof(uint32_t))]; \
|
|
uint32_t ERR_CODE = app_sched_init((EVENT_SIZE), (QUEUE_SIZE), APP_SCHED_BUF); \
|
|
APP_ERROR_CHECK(ERR_CODE); \
|
|
} while (0)
|
|
|
|
/**@brief Function for initializing the Scheduler.
|
|
*
|
|
* @details It must be called before entering the main loop.
|
|
*
|
|
* @param[in] max_event_size Maximum size of events to be passed through the scheduler.
|
|
* @param[in] queue_size Number of entries in scheduler queue (i.e. the maximum number of
|
|
* events that can be scheduled for execution).
|
|
* @param[in] p_evt_buffer Pointer to memory buffer for holding the scheduler queue. It must
|
|
* be dimensioned using the APP_SCHED_BUFFER_SIZE() macro. The buffer
|
|
* must be aligned to a 4 byte boundary.
|
|
*
|
|
* @note Normally initialization should be done using the APP_SCHED_INIT() macro, as that will both
|
|
* allocate the scheduler buffer, and also align the buffer correctly.
|
|
*
|
|
* @retval NRF_SUCCESS Successful initialization.
|
|
* @retval NRF_ERROR_INVALID_PARAM Invalid parameter (buffer not aligned to a 4 byte
|
|
* boundary).
|
|
*/
|
|
uint32_t app_sched_init(uint16_t max_event_size, uint16_t queue_size, void * p_evt_buffer);
|
|
|
|
/**@brief Function for executing all scheduled events.
|
|
*
|
|
* @details This function must be called from within the main loop. It will execute all events
|
|
* scheduled since the last time it was called.
|
|
*/
|
|
void app_sched_execute(void);
|
|
|
|
/**@brief Function for scheduling an event.
|
|
*
|
|
* @details Puts an event into the event queue.
|
|
*
|
|
* @param[in] p_event_data Pointer to event data to be scheduled.
|
|
* @param[in] event_size Size of event data to be scheduled.
|
|
* @param[in] handler Event handler to receive the event.
|
|
*
|
|
* @return NRF_SUCCESS on success, otherwise an error code.
|
|
*/
|
|
uint32_t app_sched_event_put(void * p_event_data,
|
|
uint16_t event_size,
|
|
app_sched_event_handler_t handler);
|
|
|
|
#ifdef APP_SCHEDULER_WITH_PROFILER
|
|
/**@brief Function for getting the maximum observed queue utilization.
|
|
*
|
|
* Function for tuning the module and determining QUEUE_SIZE value and thus module RAM usage.
|
|
*
|
|
* @return Maximum number of events in queue observed so far.
|
|
*/
|
|
uint16_t app_sched_queue_utilization_get(void);
|
|
#endif
|
|
|
|
#ifdef APP_SCHEDULER_WITH_PAUSE
|
|
/**@brief A function to pause the scheduler.
|
|
*
|
|
* @details When the scheduler is paused events are not pulled from the scheduler queue for
|
|
* processing. The function can be called multiple times. To unblock the scheduler the
|
|
* function @ref app_sched_resume has to be called the same number of times.
|
|
*/
|
|
void app_sched_pause(void);
|
|
|
|
/**@brief A function to resume a scheduler.
|
|
*
|
|
* @details To unblock the scheduler this function has to be called the same number of times as
|
|
* @ref app_sched_pause function.
|
|
*/
|
|
void app_sched_resume(void);
|
|
#endif
|
|
#endif // APP_SCHEDULER_H__
|
|
|
|
/** @} */
|