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106 lines
2.5 KiB
106 lines
2.5 KiB
5 months ago
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/******************************************************************************
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* Copyright (c) 2015-2023 jiangxiaogang<kerndev@foxmail.com>
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*
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* This file is part of KLite distribution.
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*
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* KLite is free software, you can redistribute it and/or modify it under
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* the MIT Licence.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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******************************************************************************/
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#include "kernel.h"
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#include "fifo.h"
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void fifo_init(fifo_t *fifo, void *buf, uint32_t size)
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{
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fifo->buf = buf;
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fifo->size = size;
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fifo->rp = 0;
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fifo->wp = 0;
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}
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uint32_t fifo_read(fifo_t *fifo, void *buf, uint32_t size)
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{
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uint32_t i;
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for(i = 0; i < size; i++)
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{
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if(fifo->rp == fifo->wp)
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{
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break;
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}
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((uint8_t *)buf)[i] = fifo->buf[fifo->rp++];
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if(fifo->rp == fifo->size)
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{
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fifo->rp = 0;
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}
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}
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return i;
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}
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uint32_t fifo_write(fifo_t *fifo, void *buf, uint32_t size)
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{
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uint32_t i;
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uint32_t pos;
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for(i = 0; i < size; i++)
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{
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pos = fifo->wp + 1;
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if(pos == fifo->size)
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{
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pos = 0;
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}
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if(pos == fifo->rp)
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{
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break;
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}
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fifo->buf[fifo->wp] = ((uint8_t *)buf)[i];
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fifo->wp = pos;
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}
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return i;
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}
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void fifo_clear(fifo_t *fifo)
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{
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fifo->wp = 0;
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fifo->rp = 0;
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}
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uint32_t fifo_get_free(fifo_t *fifo)
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{
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if(fifo->rp > fifo->wp)
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{
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return fifo->rp - fifo->wp - 1;
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}
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else
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{
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return fifo->rp + fifo->size - fifo->wp;
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}
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}
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uint32_t fifo_get_used(fifo_t *fifo)
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{
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if(fifo->wp >= fifo->rp)
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{
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return fifo->wp - fifo->rp;
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}
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else
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{
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return fifo->wp + fifo->size - fifo->rp;
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}
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}
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