/** * Copyright (c) 2012 - 2017, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include "sdk_common.h" #if NRF_MODULE_ENABLED(APP_SCHEDULER) #include "app_scheduler.h" #include #include #include #include "nrf_soc.h" #include "nrf_assert.h" #include "app_util_platform.h" /**@brief Structure for holding a scheduled event header. */ typedef struct { app_sched_event_handler_t handler; /**< Pointer to event handler to receive the event. */ uint16_t event_data_size; /**< Size of event data. */ } event_header_t; STATIC_ASSERT(sizeof(event_header_t) <= APP_SCHED_EVENT_HEADER_SIZE); static event_header_t * m_queue_event_headers; /**< Array for holding the queue event headers. */ static uint8_t * m_queue_event_data; /**< Array for holding the queue event data. */ static volatile uint8_t m_queue_start_index; /**< Index of queue entry at the start of the queue. */ static volatile uint8_t m_queue_end_index; /**< Index of queue entry at the end of the queue. */ static uint16_t m_queue_event_size; /**< Maximum event size in queue. */ static uint16_t m_queue_size; /**< Number of queue entries. */ #if APP_SCHEDULER_WITH_PROFILER static uint16_t m_max_queue_utilization; /**< Maximum observed queue utilization. */ #endif #if APP_SCHEDULER_WITH_PAUSE static uint32_t m_scheduler_paused_counter = 0; /**< Counter storing the difference between pausing and resuming the scheduler. */ #endif /**@brief Function for incrementing a queue index, and handle wrap-around. * * @param[in] index Old index. * * @return New (incremented) index. */ static __INLINE uint8_t next_index(uint8_t index) { return (index < m_queue_size) ? (index + 1) : 0; } static __INLINE uint8_t app_sched_queue_full() { uint8_t tmp = m_queue_start_index; return next_index(m_queue_end_index) == tmp; } /**@brief Macro for checking if a queue is full. */ #define APP_SCHED_QUEUE_FULL() app_sched_queue_full() static __INLINE uint8_t app_sched_queue_empty() { uint8_t tmp = m_queue_start_index; return m_queue_end_index == tmp; } /**@brief Macro for checking if a queue is empty. */ #define APP_SCHED_QUEUE_EMPTY() app_sched_queue_empty() uint32_t app_sched_init(uint16_t event_size, uint16_t queue_size, void * p_event_buffer) { uint16_t data_start_index = (queue_size + 1) * sizeof(event_header_t); // Check that buffer is correctly aligned if (!is_word_aligned(p_event_buffer)) { return NRF_ERROR_INVALID_PARAM; } // Initialize event scheduler m_queue_event_headers = p_event_buffer; m_queue_event_data = &((uint8_t *)p_event_buffer)[data_start_index]; m_queue_end_index = 0; m_queue_start_index = 0; m_queue_event_size = event_size; m_queue_size = queue_size; #if APP_SCHEDULER_WITH_PROFILER m_max_queue_utilization = 0; #endif return NRF_SUCCESS; } uint16_t app_sched_queue_space_get() { uint16_t start = m_queue_start_index; uint16_t end = m_queue_end_index; uint16_t free_space = m_queue_size - ((end >= start) ? (end - start) : (m_queue_size + 1 - start + end)); return free_space; } #if APP_SCHEDULER_WITH_PROFILER static void queue_utilization_check(void) { uint16_t start = m_queue_start_index; uint16_t end = m_queue_end_index; uint16_t queue_utilization = (end >= start) ? (end - start) : (m_queue_size + 1 - start + end); if (queue_utilization > m_max_queue_utilization) { m_max_queue_utilization = queue_utilization; } } uint16_t app_sched_queue_utilization_get(void) { return m_max_queue_utilization; } #endif // APP_SCHEDULER_WITH_PROFILER uint32_t app_sched_event_put(void const * p_event_data, uint16_t event_data_size, app_sched_event_handler_t handler) { uint32_t err_code; if (event_data_size <= m_queue_event_size) { uint16_t event_index = 0xFFFF; CRITICAL_REGION_ENTER(); if (!APP_SCHED_QUEUE_FULL()) { event_index = m_queue_end_index; m_queue_end_index = next_index(m_queue_end_index); #if APP_SCHEDULER_WITH_PROFILER // This function call must be protected with critical region because // it modifies 'm_max_queue_utilization'. queue_utilization_check(); #endif } CRITICAL_REGION_EXIT(); if (event_index != 0xFFFF) { // NOTE: This can be done outside the critical region since the event consumer will // always be called from the main loop, and will thus never interrupt this code. m_queue_event_headers[event_index].handler = handler; if ((p_event_data != NULL) && (event_data_size > 0)) { memcpy(&m_queue_event_data[event_index * m_queue_event_size], p_event_data, event_data_size); m_queue_event_headers[event_index].event_data_size = event_data_size; } else { m_queue_event_headers[event_index].event_data_size = 0; } err_code = NRF_SUCCESS; } else { err_code = NRF_ERROR_NO_MEM; } } else { err_code = NRF_ERROR_INVALID_LENGTH; } return err_code; } #if APP_SCHEDULER_WITH_PAUSE void app_sched_pause(void) { CRITICAL_REGION_ENTER(); if (m_scheduler_paused_counter < UINT32_MAX) { m_scheduler_paused_counter++; } CRITICAL_REGION_EXIT(); } void app_sched_resume(void) { CRITICAL_REGION_ENTER(); if (m_scheduler_paused_counter > 0) { m_scheduler_paused_counter--; } CRITICAL_REGION_EXIT(); } #endif //APP_SCHEDULER_WITH_PAUSE /**@brief Function for checking if scheduler is paused which means that should break processing * events. * * @return Boolean value - true if scheduler is paused, false otherwise. */ static __INLINE bool is_app_sched_paused(void) { #if APP_SCHEDULER_WITH_PAUSE return (m_scheduler_paused_counter > 0); #else return false; #endif } void app_sched_execute(void) { while (!is_app_sched_paused() && !APP_SCHED_QUEUE_EMPTY()) { // Since this function is only called from the main loop, there is no // need for a critical region here, however a special care must be taken // regarding update of the queue start index (see the end of the loop). uint16_t event_index = m_queue_start_index; void * p_event_data; uint16_t event_data_size; app_sched_event_handler_t event_handler; p_event_data = &m_queue_event_data[event_index * m_queue_event_size]; event_data_size = m_queue_event_headers[event_index].event_data_size; event_handler = m_queue_event_headers[event_index].handler; event_handler(p_event_data, event_data_size); // Event processed, now it is safe to move the queue start index, // so the queue entry occupied by this event can be used to store // a next one. m_queue_start_index = next_index(m_queue_start_index); } } #endif //NRF_MODULE_ENABLED(APP_SCHEDULER)