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xiaozhengsheng
79
components/ble/ble_link_ctx_manager/ble_link_ctx_manager.c
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79
components/ble/ble_link_ctx_manager/ble_link_ctx_manager.c
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/**
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* Copyright (c) 2017 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "ble_link_ctx_manager.h"
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#include "sdk_common.h"
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ret_code_t blcm_link_ctx_get(blcm_link_ctx_storage_t const * const p_link_ctx_storage,
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uint16_t const conn_handle,
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void ** const pp_ctx_data)
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{
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uint8_t conn_id;
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if (pp_ctx_data == NULL)
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{
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return NRF_ERROR_NULL;
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}
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else
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{
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*pp_ctx_data = NULL;
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}
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VERIFY_PARAM_NOT_NULL(p_link_ctx_storage);
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VERIFY_PARAM_NOT_NULL(p_link_ctx_storage->p_ctx_data_pool);
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VERIFY_TRUE((p_link_ctx_storage->link_ctx_size % BYTES_PER_WORD) == 0, NRF_ERROR_INVALID_PARAM);
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conn_id = ble_conn_state_conn_idx(conn_handle);
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if (conn_id == BLE_CONN_STATE_MAX_CONNECTIONS)
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{
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return NRF_ERROR_NOT_FOUND;
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}
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if (conn_id >= p_link_ctx_storage->max_links_cnt)
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{
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return NRF_ERROR_NO_MEM;
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}
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*pp_ctx_data = (void *) ((uint8_t *) p_link_ctx_storage->p_ctx_data_pool +
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conn_id * p_link_ctx_storage->link_ctx_size);
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return NRF_SUCCESS;
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}
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127
components/ble/ble_link_ctx_manager/ble_link_ctx_manager.h
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127
components/ble/ble_link_ctx_manager/ble_link_ctx_manager.h
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/**
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* Copyright (c) 2017 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/** @file
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*
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* @defgroup ble_link_ctx_manager BLE Link Context Manager
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* @{
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* @ingroup ble_sdk_lib
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* @brief Storage for link-related data.
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*
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* @details BLE Link Context Manager can be used as a simple storage for link-related data.
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* Each link context data is uniquely identified within the storage by its connection
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* handle and can be retrieved from it by using this handle.
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*
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*/
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#ifndef BLE_LINK_CTX_MANAGER_H__
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#define BLE_LINK_CTX_MANAGER_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include "ble_conn_state.h"
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#include "sdk_errors.h"
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/**@brief Macro for defining a blcm_link_ctx_storage instance.
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*
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* @param[in] _name Name of the instance.
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* @param[in] _max_clients Maximum number of clients connected at a time.
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* @param[in] _link_ctx_size Context size in bytes for a single link.
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*/
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#define BLE_LINK_CTX_MANAGER_DEF(_name, _max_clients, _link_ctx_size) \
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STATIC_ASSERT((_max_clients) <= BLE_CONN_STATE_MAX_CONNECTIONS); \
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static uint32_t CONCAT_2(_name, _ctx_data_pool)[(_max_clients)*BYTES_TO_WORDS(_link_ctx_size)]; \
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static blcm_link_ctx_storage_t _name = \
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{ \
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.p_ctx_data_pool = CONCAT_2(_name, _ctx_data_pool), \
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.max_links_cnt = (_max_clients), \
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.link_ctx_size = sizeof(CONCAT_2(_name, _ctx_data_pool))/(_max_clients) \
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}
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/**
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* @brief Type of description that is used for registry of all current connections.
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*/
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typedef struct
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{
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void * const p_ctx_data_pool; /**< Pointer to links context memory pool. */
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uint8_t const max_links_cnt; /**< Maximum number of concurrent links. */
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uint16_t const link_ctx_size; /**< Context size in bytes for a single link (word-aligned). */
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} blcm_link_ctx_storage_t;
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/**
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* @brief Function for getting the link context from the link registry.
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*
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* This function finds the link context in the registry. The link to find is identified by the
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* connection handle within the registry.
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*
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* The context is preserved for the lifetime of the connection. When a new connection occurs, the
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* value of its context is undefined, and should be initialized.
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*
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* @param[in] p_link_ctx_storage Pointer to the link storage descriptor.
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* @param[in] conn_handle Connection whose context to find.
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* @param[out] pp_ctx_data Pointer to data with context for the connection.
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*
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* @retval NRF_ERROR_NULL If \p p_link_ctx_storage is NULL or contains a NULL pointer, or if
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* \p pp_ctx_data is NULL.
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* @retval NRF_ERROR_INVALID_PARAM If \p p_link_ctx_storage::link_ctx_size is not multiple of word
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* size.
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* @retval NRF_ERROR_NOT_FOUND If \p conn_handle does not refer to an active or recently
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* disconnected link.
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* @retval NRF_ERROR_NO_MEM If there is not enough memory to store context for the given
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* connection handle. This can happen if the number of links is
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* greater than \p p_link_ctx_storage::max_links_cnt.
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* @retval NRF_SUCCESS If the operation was successful.
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*/
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ret_code_t blcm_link_ctx_get(blcm_link_ctx_storage_t const * const p_link_ctx_storage,
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uint16_t const conn_handle,
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void ** const pp_ctx_data);
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#ifdef __cplusplus
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}
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#endif
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#endif // BLE_LINK_CTX_MANAGER_H__
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/** @} */
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