/** * Copyright (c) 2015 - 2018, 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. * */ #ifndef BUFFER_H__ #define BUFFER_H__ #include #include "compiler_abstraction.h" #include "sdk_errors.h" #include "nrf_atflags.h" #ifdef __cplusplus extern "C" { #endif /** * @cond NO_DOXYGEN * @defgroup pm_buffer Buffer * @ingroup peer_manager * @{ * @brief An internal module of @ref peer_manager. This module provides a simple buffer. */ #define PM_BUFFER_INVALID_ID 0xFF //!< Invalid buffer block ID. /**@brief Convenience macro for declaring memory and initializing a buffer instance. * * @param[out] p_buffer The buffer instance to initialize. * @param[in] n_blocks The desired number of blocks in the buffer. * @param[in] block_size The desired block size of the buffer. * @param[out] err_code The return code from @ref pm_buffer_init. */ #define PM_BUFFER_INIT(p_buffer, n_blocks, block_size, err_code) \ do \ { \ __ALIGN(4) static uint8_t buffer_memory[(n_blocks) * (block_size)]; \ static NRF_ATFLAGS_DEF(mutex_memory, n_blocks); \ err_code = pm_buffer_init((p_buffer), \ buffer_memory, \ (n_blocks) * (block_size), \ mutex_memory, \ (n_blocks), \ (block_size)); \ } while (0) typedef struct { uint8_t * p_memory; /**< The storage for all buffer entries. The size of the buffer must be n_blocks*block_size. */ nrf_atflags_t * p_mutex; /**< A mutex group with one mutex for each buffer entry. */ uint32_t n_blocks; /**< The number of allocatable blocks in the buffer. */ uint32_t block_size; /**< The size of each block in the buffer. */ } pm_buffer_t; /**@brief Function for initializing a buffer instance. * * @param[out] p_buffer The buffer instance to initialize. * @param[in] p_buffer_memory The memory this buffer will use. * @param[in] buffer_memory_size The size of p_buffer_memory. This must be at least * n_blocks*block_size. * @param[in] p_mutex_memory The memory for the mutexes. This must be at least * @ref NRF_ATFLAGS_ARRAY_LEN(n_blocks). * @param[in] n_blocks The number of blocks in the buffer. * @param[in] block_size The size of each block. * * @retval NRF_SUCCESS Successfully initialized buffer instance. * @retval NRF_ERROR_INVALID_PARAM A parameter was 0 or NULL or a size was too small. */ ret_code_t pm_buffer_init(pm_buffer_t * p_buffer, uint8_t * p_buffer_memory, uint32_t buffer_memory_size, nrf_atflags_t * p_mutex_memory, uint32_t n_blocks, uint32_t block_size); /**@brief Function for acquiring a buffer block in a buffer. * * @param[in] p_buffer The buffer instance acquire from. * @param[in] n_blocks The number of contiguous blocks to acquire. * * @return The id of the acquired block, if successful. * @retval PM_BUFFER_INVALID_ID If unsuccessful. */ uint8_t pm_buffer_block_acquire(pm_buffer_t * p_buffer, uint32_t n_blocks); /**@brief Function for getting a pointer to a specific buffer block. * * @param[in] p_buffer The buffer instance get from. * @param[in] id The id of the buffer to get the pointer for. * * @return A pointer to the buffer for the specified id, if the id is valid. * @retval NULL If the id is invalid. */ uint8_t * pm_buffer_ptr_get(pm_buffer_t * p_buffer, uint8_t id); /**@brief Function for releasing a buffer block. * * @param[in] p_buffer The buffer instance containing the block to release. * @param[in] id The id of the block to release. */ void pm_buffer_release(pm_buffer_t * p_buffer, uint8_t id); #ifdef __cplusplus } #endif #endif // BUFFER_H__ /** * @} * @endcond */