You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
2.5 KiB
105 lines
2.5 KiB
/******************************************************************************
|
|
* Copyright (c) 2015-2023 jiangxiaogang<kerndev@foxmail.com>
|
|
*
|
|
* This file is part of KLite distribution.
|
|
*
|
|
* KLite is free software, you can redistribute it and/or modify it under
|
|
* the MIT Licence.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
******************************************************************************/
|
|
#include "kernel.h"
|
|
#include "fifo.h"
|
|
|
|
void fifo_init(fifo_t *fifo, void *buf, uint32_t size)
|
|
{
|
|
fifo->buf = buf;
|
|
fifo->size = size;
|
|
fifo->rp = 0;
|
|
fifo->wp = 0;
|
|
}
|
|
|
|
uint32_t fifo_read(fifo_t *fifo, void *buf, uint32_t size)
|
|
{
|
|
uint32_t i;
|
|
for(i = 0; i < size; i++)
|
|
{
|
|
if(fifo->rp == fifo->wp)
|
|
{
|
|
break;
|
|
}
|
|
((uint8_t *)buf)[i] = fifo->buf[fifo->rp++];
|
|
if(fifo->rp == fifo->size)
|
|
{
|
|
fifo->rp = 0;
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
uint32_t fifo_write(fifo_t *fifo, void *buf, uint32_t size)
|
|
{
|
|
uint32_t i;
|
|
uint32_t pos;
|
|
for(i = 0; i < size; i++)
|
|
{
|
|
pos = fifo->wp + 1;
|
|
if(pos == fifo->size)
|
|
{
|
|
pos = 0;
|
|
}
|
|
if(pos == fifo->rp)
|
|
{
|
|
break;
|
|
}
|
|
fifo->buf[fifo->wp] = ((uint8_t *)buf)[i];
|
|
fifo->wp = pos;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void fifo_clear(fifo_t *fifo)
|
|
{
|
|
fifo->wp = 0;
|
|
fifo->rp = 0;
|
|
}
|
|
|
|
uint32_t fifo_get_free(fifo_t *fifo)
|
|
{
|
|
if(fifo->rp > fifo->wp)
|
|
{
|
|
return fifo->rp - fifo->wp - 1;
|
|
}
|
|
else
|
|
{
|
|
return fifo->rp + fifo->size - fifo->wp;
|
|
}
|
|
}
|
|
|
|
uint32_t fifo_get_used(fifo_t *fifo)
|
|
{
|
|
if(fifo->wp >= fifo->rp)
|
|
{
|
|
return fifo->wp - fifo->rp;
|
|
}
|
|
else
|
|
{
|
|
return fifo->wp + fifo->size - fifo->rp;
|
|
}
|
|
}
|
|
|