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//******************************************************************************
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//*
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//* FULLNAME: Single-Chip Microcontroller Real-Time Operating System
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//*
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//* NICKNAME: scmRTOS
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//*
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//* PURPOSE: User Suport Library Source
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//*
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//* Version: 3.10
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//*
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//* $Revision: 256 $
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//* $Date:: 2010-01-22 #$
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//*
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//* Copyright (c) 2003-2010, Harry E. Zhurov
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//*
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//* Permission is hereby granted, free of charge, to any person
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//* obtaining a copy of this software and associated documentation
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//* files (the "Software"), to deal in the Software without restriction,
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//* including without limitation the rights to use, copy, modify, merge,
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//* publish, distribute, sublicense, and/or sell copies of the Software,
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//* and to permit persons to whom the Software is furnished to do so,
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//* subject to the following conditions:
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//*
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//* The above copyright notice and this permission notice shall be included
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//* in all 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,
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//* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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//* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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//* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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//* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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//* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
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//* THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//*
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//* =================================================================
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//* See http://scmrtos.sourceforge.net for documentation, latest
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//* information, license and contact details.
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//* =================================================================
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//*
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//******************************************************************************
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#include <usrlib.h>
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#include <commdefs.h>
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using namespace usr;
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//------------------------------------------------------------------------------
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//
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/// Circular buffer function-member description
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//
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//
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//
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TCbuf::TCbuf(byte* const Address, const byte Size) :
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buf(Address),
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size(Size),
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count(0),
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first(0),
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last(0)
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{
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}
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//------------------------------------------------------------------------------
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bool TCbuf::write(const byte* data, const byte Count)
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{
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if( Count > (size - count) )
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return false;
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for(byte i = 0; i < Count; i++)
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push(*(data++));
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return true;
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}
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//------------------------------------------------------------------------------
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void TCbuf::read(byte* data, const byte Count)
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{
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byte N = Count <= count ? Count : count;
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for(byte i = 0; i < N; i++)
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data[i] = pop();
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}
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//------------------------------------------------------------------------------
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byte TCbuf::get_byte(const byte index) const
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{
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byte x = first + index;
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if(x < size)
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return buf[x];
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else
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return buf[x - size];
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}
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//------------------------------------------------------------------------------
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bool TCbuf::put(const byte item)
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{
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if(count == size)
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return false;
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push(item);
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return true;
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}
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//------------------------------------------------------------------------------
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byte TCbuf::get()
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{
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if(count)
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return pop();
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else
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return 0;
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}
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//------------------------------------------------------------------------------
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//
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/// \note
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/// For internal purposes.
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/// Use this function with care - it doesn't perform free size check.
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//
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void TCbuf::push(const byte item)
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{
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buf[last] = item;
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last++;
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count++;
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if(last == size)
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last = 0;
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}
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//------------------------------------------------------------------------------
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//
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/// \note
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/// For internal purposes.
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/// Use this function with care - it doesn't perform free size check.
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//
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byte TCbuf::pop()
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{
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byte item = buf[first];
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count--;
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first++;
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if(first == size)
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first = 0;
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return item;
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}
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//------------------------------------------------------------------------------
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Segundo Equipo