/** * Copyright (c) 2017 - 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. * */ #ifndef NRF_RINGBUF_H #define NRF_RINGBUF_H /** * @defgroup nrf_ringbuf Ring buffer * @{ * @ingroup app_common * @brief Functions for controlling the ring buffer. */ #include #include "nrf_atomic.h" #include "sdk_errors.h" #ifdef __cplusplus extern "C" { #endif /** * @brief Ring buffer instance control block. * */ typedef struct { nrf_atomic_flag_t wr_flag; //!< Protection flag. nrf_atomic_flag_t rd_flag; //!< Protection flag. uint32_t wr_idx; //!< Write index (updated when putting). uint32_t tmp_wr_idx; //!< Temporary write index (updated when allocating). uint32_t rd_idx; //!< Read index (updated when freeing). uint32_t tmp_rd_idx; //!< Temporary read index (updated when getting). } nrf_ringbuf_cb_t; /** * @brief Ring buffer instance structure. * */ typedef struct { uint8_t * p_buffer; //!< Pointer to the memory used by the ring buffer. uint32_t bufsize_mask; //!< Buffer size mask (buffer size must be a power of 2). nrf_ringbuf_cb_t * p_cb; //!< Pointer to the instance control block. } nrf_ringbuf_t; /** * @brief Macro for defining a ring buffer instance. * * @param _name Instance name. * @param _size Size of the ring buffer (must be a power of 2). * */ #define NRF_RINGBUF_DEF(_name, _size) \ STATIC_ASSERT(IS_POWER_OF_TWO(_size)); \ static uint8_t CONCAT_2(_name,_buf)[_size]; \ static nrf_ringbuf_cb_t CONCAT_2(_name,_cb); \ static const nrf_ringbuf_t _name = { \ .p_buffer = CONCAT_2(_name,_buf), \ .bufsize_mask = _size - 1, \ .p_cb = &CONCAT_2(_name,_cb), \ } /** * @brief Function for initializing a ring buffer instance. * * @param p_ringbuf Pointer to the ring buffer instance. * * */ void nrf_ringbuf_init(nrf_ringbuf_t const * p_ringbuf); /** * @brief Function for allocating memory from a ring buffer. * * This function attempts to allocate the amount of memory requested by the user, or a smaller amount if * the requested amount is not available. If a start flag is set, then exclusive access to allocation * is established. @ref nrf_ringbuf_put frees access to allocation. If a start flag is not set, then * exclusive access check is omitted. * * @param[in] p_ringbuf Pointer to the ring buffer instance. * @param[in] pp_data Pointer to the pointer to the allocated buffer. * @param[in, out] p_length Pointer to length. Length is set to the requested amount and filled * by the function with actually allocated amount. * @param[in] start Set to true if exclusive access should be controlled. * * @retval NRF_SUCCESS Successful allocation (can be smaller amount than requested). * NRF_ERROR_BUSY Ring buffer allocation process (alloc-put) is ongoing. * * */ ret_code_t nrf_ringbuf_alloc(nrf_ringbuf_t const * p_ringbuf, uint8_t * * pp_data, size_t * p_length, bool start); /** * @brief Function for commiting data to a ring buffer. * * When an allocated buffer (see @ref nrf_ringbuf_alloc) has been filled with data, it must be committed * to make it available for @ref nrf_ringbuf_get and @ref nrf_ringbuf_cpy_get. This function commits * the data (can be smaller amount than allocated). * * @param[in] p_ringbuf Pointer to the ring buffer instance. * @param[in] length Amount of bytes to put. * @return NRF_SUCCESS on successful put or error. * */ ret_code_t nrf_ringbuf_put(nrf_ringbuf_t const * p_ringbuf, size_t length); /** * @brief Function for copying data directly into the ring buffer. * * This function copies a user buffer to the ring buffer. * * @param[in] p_ringbuf Pointer to the ring buffer instance. * @param[in] p_data Pointer to the input buffer. * @param[in, out] p_length Amount of bytes to copy. Amount of bytes copied. * @return NRF_SUCCESS on successful put or error. * */ ret_code_t nrf_ringbuf_cpy_put(nrf_ringbuf_t const * p_ringbuf, uint8_t const* p_data, size_t * p_length); /** * Function for getting data from the ring buffer. * * This function attempts to get the requested amount of data from the ring buffer. If a start flag is set, then * exclusive access to getting data from the ring buffer is established. @ref nrf_ringbuf_free frees * access to getting data from the ring buffer. If a start flag is not set, then * exclusive access check is omitted. * * @param[in] p_ringbuf Pointer to the ring buffer instance. * @param[in] pp_data Pointer to the pointer to the buffer with data. * @param[in, out] p_length Pointer to length. Length is set to the requested amount and filled * by the function with the actual amount. * @param[in] start Set to true if exclusive access should be controlled. * * @retval NRF_SUCCESS Successful getting (can be smaller amount than requested). * NRF_ERROR_BUSY Ring buffer getting process (get-free) is ongoing. */ ret_code_t nrf_ringbuf_get(nrf_ringbuf_t const * p_ringbuf, uint8_t * * pp_data, size_t * p_length, bool start); /** * @brief Function for freeing a buffer back to the ring buffer. * * When a buffer with data taken from the ring buffer (see @ref nrf_ringbuf_get) has been processed, it * must be freed to make it available for further use. This function frees the buffer (can be smaller * amount than get). * * @param[in] p_ringbuf Pointer to the ring buffer instance. * @param[in] length Amount of bytes to free. * @return NRF_SUCCESS on successful put or error. * */ ret_code_t nrf_ringbuf_free(nrf_ringbuf_t const * p_ringbuf, size_t length); /** * @brief Function for copying data directly out of the ring buffer. * * This function copies available data from the ring buffer to a user buffer. * * @param[in] p_ringbuf Pointer to the ring buffer instance. * @param[in] p_data Pointer to the input buffer. * @param[in, out] p_length Amount of bytes to copy. Amount of bytes copied. * @return NRF_SUCCESS on successful put or error. * */ ret_code_t nrf_ringbuf_cpy_get(nrf_ringbuf_t const * p_ringbuf, uint8_t * p_data, size_t * p_length); #ifdef __cplusplus } #endif #endif //NRF_RINGBUF_H /** @} */