/** * Copyright (c) 2013 - 2019, 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. * */ /** @file * * @defgroup hci_mem_pool Memory pool * @{ * @ingroup app_common * * @brief Memory pool implementation * * Memory pool implementation, based on circular buffer data structure, which supports asynchronous * processing of RX data. The current default implementation supports 1 TX buffer and 4 RX buffers. * The memory managed by the pool is allocated from static storage instead of heap. The internal * design of the circular buffer implementing the RX memory layout is illustrated in the picture * below. * * @image html memory_pool.svg "Circular buffer design" * * The expected call order for the RX APIs is as follows: * - hci_mem_pool_rx_produce * - hci_mem_pool_rx_data_size_set * - hci_mem_pool_rx_extract * - hci_mem_pool_rx_consume * * @warning If the above mentioned expected call order is violated the end result can be undefined. * * \par Component specific configuration options * * The following compile time configuration options are available to suit various implementations: * - TX_BUF_SIZE TX buffer size in bytes. * - RX_BUF_SIZE RX buffer size in bytes. * - RX_BUF_QUEUE_SIZE RX buffer element size. */ #ifndef HCI_MEM_POOL_H__ #define HCI_MEM_POOL_H__ #include #include "nrf_error.h" #ifdef __cplusplus extern "C" { #endif /**@brief Function for opening the module. * * @retval NRF_SUCCESS Operation success. */ uint32_t hci_mem_pool_open(void); /**@brief Function for closing the module. * * @retval NRF_SUCCESS Operation success. */ uint32_t hci_mem_pool_close(void); /**@brief Function for allocating requested amount of TX memory. * * @param[out] pp_buffer Pointer to the allocated memory. * * @retval NRF_SUCCESS Operation success. Memory was allocated. * @retval NRF_ERROR_NO_MEM Operation failure. No memory available for allocation. * @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied. */ uint32_t hci_mem_pool_tx_alloc(void ** pp_buffer); /**@brief Function for freeing previously allocated TX memory. * * @note Memory management follows the FIFO principle meaning that free() order must match the * alloc(...) order, which is the reason for omitting exact memory block identifier as an * input parameter. * * @retval NRF_SUCCESS Operation success. Memory was freed. */ uint32_t hci_mem_pool_tx_free(void); /**@brief Function for producing a free RX memory block for usage. * * @note Upon produce request amount being 0, NRF_SUCCESS is returned. * * @param[in] length Amount, in bytes, of free memory to be produced. * @param[out] pp_buffer Pointer to the allocated memory. * * @retval NRF_SUCCESS Operation success. Free RX memory block produced. * @retval NRF_ERROR_NO_MEM Operation failure. No suitable memory available for allocation. * @retval NRF_ERROR_DATA_SIZE Operation failure. Request size exceeds limit. * @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied. */ uint32_t hci_mem_pool_rx_produce(uint32_t length, void ** pp_buffer); /**@brief Function for setting the length of the last produced RX memory block. * * @warning If call to this API is omitted the end result is that the following call to * mem_pool_rx_extract will return incorrect data in the p_length output parameter. * * @param[in] length Amount, in bytes, of actual memory used. * * @retval NRF_SUCCESS Operation success. Length was set. */ uint32_t hci_mem_pool_rx_data_size_set(uint32_t length); /**@brief Function for extracting a packet, which has been filled with read data, for further * processing. * * @param[out] pp_buffer Pointer to the packet data. * @param[out] p_length Length of packet data in bytes. * * @retval NRF_SUCCESS Operation success. * @retval NRF_ERROR_NO_MEM Operation failure. No packet available to extract. * @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied. */ uint32_t hci_mem_pool_rx_extract(uint8_t ** pp_buffer, uint32_t * p_length); /**@brief Function for freeing previously extracted packet, which has been filled with read data. * * @param[in] p_buffer Pointer to consumed buffer. * * @retval NRF_SUCCESS Operation success. * @retval NRF_ERROR_NO_MEM Operation failure. No packet available to free. * @retval NRF_ERROR_INVALID_ADDR Operation failure. Not a valid pointer. */ uint32_t hci_mem_pool_rx_consume(uint8_t * p_buffer); #ifdef __cplusplus } #endif #endif // HCI_MEM_POOL_H__ /** @} */