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Diff: TARGET_NRF51_MICROBIT/TARGET_NORDIC/TARGET_MCU_NRF51822/Lib/nordic_sdk/components/libraries/scheduler/app_scheduler.h
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TARGET_NRF51_MICROBIT/TARGET_NORDIC/TARGET_MCU_NRF51822/Lib/nordic_sdk/components/libraries/scheduler/app_scheduler.h Thu Apr 07 18:33:58 2016 +0100 @@ -0,0 +1,152 @@ +/* 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 (SD_S110 && !SD_S310) + * 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" + +#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_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__ + +/** @} */