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Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.h')
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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.h new file mode 100644 index 0000000..8123227 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.h @@ -0,0 +1,181 @@ +/** + * Copyright (c) 2013 - 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. + * + */ +/**@file + * + * @defgroup app_fifo FIFO implementation + * @{ + * @ingroup app_common + * + * @brief FIFO implementation. + */ + +#ifndef APP_FIFO_H__ +#define APP_FIFO_H__ + +#include <stdint.h> +#include <stdlib.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/**@brief A FIFO instance structure. + * @details Keeps track of which bytes to read and write next. + * Also, it keeps the information about which memory is allocated for the buffer + * and its size. This structure must be initialized by app_fifo_init() before use. + */ +typedef struct +{ + uint8_t * p_buf; /**< Pointer to FIFO buffer memory. */ + uint16_t buf_size_mask; /**< Read/write index mask. Also used for size checking. */ + volatile uint32_t read_pos; /**< Next read position in the FIFO buffer. */ + volatile uint32_t write_pos; /**< Next write position in the FIFO buffer. */ +} app_fifo_t; + +/**@brief Function for initializing the FIFO. + * + * @param[out] p_fifo FIFO object. + * @param[in] p_buf FIFO buffer for storing data. The buffer size must be a power of two. + * @param[in] buf_size Size of the FIFO buffer provided. This size must be a power of two. + * + * @retval NRF_SUCCESS If initialization was successful. + * @retval NRF_ERROR_NULL If a NULL pointer is provided as buffer. + * @retval NRF_ERROR_INVALID_LENGTH If size of buffer provided is not a power of two. + */ +uint32_t app_fifo_init(app_fifo_t * p_fifo, uint8_t * p_buf, uint16_t buf_size); + +/**@brief Function for adding an element to the FIFO. + * + * @param[in] p_fifo Pointer to the FIFO. + * @param[in] byte Data byte to add to the FIFO. + * + * @retval NRF_SUCCESS If an element has been successfully added to the FIFO. + * @retval NRF_ERROR_NO_MEM If the FIFO is full. + */ +uint32_t app_fifo_put(app_fifo_t * p_fifo, uint8_t byte); + +/**@brief Function for getting the next element from the FIFO. + * + * @param[in] p_fifo Pointer to the FIFO. + * @param[out] p_byte Byte fetched from the FIFO. + * + * @retval NRF_SUCCESS If an element was returned. + * @retval NRF_ERROR_NOT_FOUND If there are no more elements in the queue. + */ +uint32_t app_fifo_get(app_fifo_t * p_fifo, uint8_t * p_byte); + +/**@brief Function for looking at an element in the FIFO, without consuming it. + * + * @param[in] p_fifo Pointer to the FIFO. + * @param[in] index Which element to look at. The lower the index, the earlier it was put. + * @param[out] p_byte Byte fetched from the FIFO. + * + * @retval NRF_SUCCESS If an element was returned. + * @retval NRF_ERROR_NOT_FOUND If there are no more elements in the queue, or the index was + * too large. + */ +uint32_t app_fifo_peek(app_fifo_t * p_fifo, uint16_t index, uint8_t * p_byte); + +/**@brief Function for flushing the FIFO. + * + * @param[in] p_fifo Pointer to the FIFO. + * + * @retval NRF_SUCCESS If the FIFO was flushed successfully. + */ +uint32_t app_fifo_flush(app_fifo_t * p_fifo); + +/**@brief Function for reading bytes from the FIFO. + * + * This function can also be used to get the number of bytes in the FIFO. + * + * @param[in] p_fifo Pointer to the FIFO. Must not be NULL. + * @param[out] p_byte_array Memory pointer where the read bytes are fetched from the FIFO. + * Can be NULL. If NULL, the number of bytes that can be read in the FIFO + * are returned in the p_size parameter. + * @param[inout] p_size Address to memory indicating the maximum number of bytes to be read. + * The provided memory is overwritten with the actual number of bytes + * read if the procedure was successful. This field must not be NULL. + * If p_byte_array is set to NULL by the application, this parameter + * returns the number of bytes in the FIFO. + * + * @retval NRF_SUCCESS If the procedure is successful. The actual number of bytes read might + * be less than the requested maximum, depending on how many elements exist + * in the FIFO. Even if less bytes are returned, the procedure is considered + * successful. + * @retval NRF_ERROR_NULL If a NULL parameter was passed for a parameter that must not + * be NULL. + * @retval NRF_ERROR_NOT_FOUND If the FIFO is empty. + */ +uint32_t app_fifo_read(app_fifo_t * p_fifo, uint8_t * p_byte_array, uint32_t * p_size); + +/**@brief Function for writing bytes to the FIFO. + * + * This function can also be used to get the available size on the FIFO. + * + * @param[in] p_fifo Pointer to the FIFO. Must not be NULL. + * @param[in] p_byte_array Memory pointer containing the bytes to be written to the FIFO. + * Can be NULL. If NULL, this function returns the number of bytes + * that can be written to the FIFO. + * @param[inout] p_size Address to memory indicating the maximum number of bytes to be written. + * The provided memory is overwritten with the number of bytes that were actually + * written if the procedure is successful. This field must not be NULL. + * If p_byte_array is set to NULL by the application, this parameter + * returns the number of bytes available in the FIFO. + * + * @retval NRF_SUCCESS If the procedure is successful. The actual number of bytes written might + * be less than the requested maximum, depending on how much room there is in + * the FIFO. Even if less bytes are written, the procedure is considered + * successful. If the write was partial, the application should use + * subsequent calls to attempt writing the data again. + * @retval NRF_ERROR_NULL If a NULL parameter was passed for a parameter that must not + * be NULL. + * @retval NRF_ERROR_NO_MEM If the FIFO is full. + * + */ +uint32_t app_fifo_write(app_fifo_t * p_fifo, uint8_t const * p_byte_array, uint32_t * p_size); + + +#ifdef __cplusplus +} +#endif + +#endif // APP_FIFO_H__ + +/** @} */ |