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Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.c new file mode 100644 index 0000000..b14a159 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/fifo/app_fifo.c @@ -0,0 +1,214 @@ +/** + * 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. + * + */ +#include "sdk_common.h" +#if NRF_MODULE_ENABLED(APP_FIFO) +#include "app_fifo.h" + +static __INLINE uint32_t fifo_length(app_fifo_t * p_fifo) +{ + uint32_t tmp = p_fifo->read_pos; + return p_fifo->write_pos - tmp; +} + + +#define FIFO_LENGTH() fifo_length(p_fifo) /**< Macro for calculating the FIFO length. */ + + +/**@brief Put one byte to the FIFO. */ +static __INLINE void fifo_put(app_fifo_t * p_fifo, uint8_t byte) +{ + p_fifo->p_buf[p_fifo->write_pos & p_fifo->buf_size_mask] = byte; + p_fifo->write_pos++; +} + + +/**@brief Look at one byte in the FIFO. */ +static __INLINE void fifo_peek(app_fifo_t * p_fifo, uint16_t index, uint8_t * p_byte) +{ + *p_byte = p_fifo->p_buf[(p_fifo->read_pos + index) & p_fifo->buf_size_mask]; +} + + +/**@brief Get one byte from the FIFO. */ +static __INLINE void fifo_get(app_fifo_t * p_fifo, uint8_t * p_byte) +{ + fifo_peek(p_fifo, 0, p_byte); + p_fifo->read_pos++; +} + + +uint32_t app_fifo_init(app_fifo_t * p_fifo, uint8_t * p_buf, uint16_t buf_size) +{ + // Check buffer for null pointer. + if (p_buf == NULL) + { + return NRF_ERROR_NULL; + } + + // Check that the buffer size is a power of two. + if (!IS_POWER_OF_TWO(buf_size)) + { + return NRF_ERROR_INVALID_LENGTH; + } + + p_fifo->p_buf = p_buf; + p_fifo->buf_size_mask = buf_size - 1; + p_fifo->read_pos = 0; + p_fifo->write_pos = 0; + + return NRF_SUCCESS; +} + + +uint32_t app_fifo_put(app_fifo_t * p_fifo, uint8_t byte) +{ + if (FIFO_LENGTH() <= p_fifo->buf_size_mask) + { + fifo_put(p_fifo, byte); + return NRF_SUCCESS; + } + + return NRF_ERROR_NO_MEM; +} + + +uint32_t app_fifo_get(app_fifo_t * p_fifo, uint8_t * p_byte) +{ + if (FIFO_LENGTH() != 0) + { + fifo_get(p_fifo, p_byte); + return NRF_SUCCESS; + } + + return NRF_ERROR_NOT_FOUND; + +} + + +uint32_t app_fifo_peek(app_fifo_t * p_fifo, uint16_t index, uint8_t * p_byte) +{ + if (FIFO_LENGTH() > index) + { + fifo_peek(p_fifo, index, p_byte); + return NRF_SUCCESS; + } + + return NRF_ERROR_NOT_FOUND; +} + + +uint32_t app_fifo_flush(app_fifo_t * p_fifo) +{ + p_fifo->read_pos = p_fifo->write_pos; + return NRF_SUCCESS; +} + + +uint32_t app_fifo_read(app_fifo_t * p_fifo, uint8_t * p_byte_array, uint32_t * p_size) +{ + VERIFY_PARAM_NOT_NULL(p_fifo); + VERIFY_PARAM_NOT_NULL(p_size); + + const uint32_t byte_count = fifo_length(p_fifo); + const uint32_t requested_len = (*p_size); + uint32_t index = 0; + uint32_t read_size = MIN(requested_len, byte_count); + + (*p_size) = byte_count; + + // Check if the FIFO is empty. + if (byte_count == 0) + { + return NRF_ERROR_NOT_FOUND; + } + + // Check if application has requested only the size. + if (p_byte_array == NULL) + { + return NRF_SUCCESS; + } + + // Fetch bytes from the FIFO. + while (index < read_size) + { + fifo_get(p_fifo, &p_byte_array[index++]); + } + + (*p_size) = read_size; + + return NRF_SUCCESS; +} + + +uint32_t app_fifo_write(app_fifo_t * p_fifo, uint8_t const * p_byte_array, uint32_t * p_size) +{ + VERIFY_PARAM_NOT_NULL(p_fifo); + VERIFY_PARAM_NOT_NULL(p_size); + + const uint32_t available_count = p_fifo->buf_size_mask - fifo_length(p_fifo) + 1; + const uint32_t requested_len = (*p_size); + uint32_t index = 0; + uint32_t write_size = MIN(requested_len, available_count); + + (*p_size) = available_count; + + // Check if the FIFO is FULL. + if (available_count == 0) + { + return NRF_ERROR_NO_MEM; + } + + // Check if application has requested only the size. + if (p_byte_array == NULL) + { + return NRF_SUCCESS; + } + + //Fetch bytes from the FIFO. + while (index < write_size) + { + fifo_put(p_fifo, p_byte_array[index++]); + } + + (*p_size) = write_size; + + return NRF_SUCCESS; +} +#endif //NRF_MODULE_ENABLED(APP_FIFO) |