98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* fifo.h
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*
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* Created on: Nov 27, 2012
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* Author: hathach
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*/
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/*
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* Software License Agreement (BSD License)
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* Copyright (c) 2013, hathach (tinyusb.net)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the tinyUSB stack.
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*/
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/** \file
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* \brief Error Header
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*
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* \note TBD
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*/
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/** \ingroup Group_Common
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*
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* @{
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*/
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#ifndef _TUSB_FIFO_H_
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#define _TUSB_FIFO_H_
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#include "common/common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \struct fifo_t
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* \brief Simple Circular FIFO
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*/
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typedef struct _fifo_t
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{
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uint8_t* buf ; ///< buffer pointer
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uint16_t size ; ///< buffer size
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volatile uint16_t len ; ///< bytes in fifo
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volatile uint16_t wr_ptr ; ///< write pointer
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volatile uint16_t rd_ptr ; ///< read pointer
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bool overwritable ; ///< allow overwrite data when full
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IRQn_Type irq ; ///< TODO (abstract later) interrupt used to lock fifo
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} fifo_t;
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bool fifo_init(fifo_t* f, uint8_t* buffer, uint16_t size, bool overwritable, IRQn_Type irq);
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bool fifo_write(fifo_t* f, uint8_t data);
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bool fifo_read(fifo_t* f, uint8_t *data);
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uint16_t fifo_read_n(fifo_t* f, uint8_t * rx, uint16_t maxlen);
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void fifo_clear(fifo_t *f);
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static inline bool fifo_is_empty(fifo_t* f)
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{
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return (f->len == 0);
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}
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static inline bool fifo_is_full(fifo_t* f)
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{
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return (f->len == f->size);
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}
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static inline uint16_t fifo_get_length(fifo_t* f)
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{
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return f->len;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _TUSB_FIFO_H_ */
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