File content as of revision 0:d7810ff946c1:
//******************************************************************************
//*
//* FULLNAME: Single-Chip Microcontroller Real-Time Operating System
//*
//* NICKNAME: scmRTOS
//*
//* PURPOSE: User Suport Library Source
//*
//* Version: 3.10
//*
//* $Revision: 256 $
//* $Date:: 2010-01-22 #$
//*
//* Copyright (c) 2003-2010, Harry E. Zhurov
//*
//* 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.
//*
//* =================================================================
//* See http://scmrtos.sourceforge.net for documentation, latest
//* information, license and contact details.
//* =================================================================
//*
//******************************************************************************
#include <usrlib.h>
#include <commdefs.h>
using namespace usr;
//------------------------------------------------------------------------------
//
/// Circular buffer function-member description
//
//
//
TCbuf::TCbuf(byte* const Address, const byte Size) :
buf(Address),
size(Size),
count(0),
first(0),
last(0)
{
}
//------------------------------------------------------------------------------
bool TCbuf::write(const byte* data, const byte Count)
{
if( Count > (size - count) )
return false;
for(byte i = 0; i < Count; i++)
push(*(data++));
return true;
}
//------------------------------------------------------------------------------
void TCbuf::read(byte* data, const byte Count)
{
byte N = Count <= count ? Count : count;
for(byte i = 0; i < N; i++)
data[i] = pop();
}
//------------------------------------------------------------------------------
byte TCbuf::get_byte(const byte index) const
{
byte x = first + index;
if(x < size)
return buf[x];
else
return buf[x - size];
}
//------------------------------------------------------------------------------
bool TCbuf::put(const byte item)
{
if(count == size)
return false;
push(item);
return true;
}
//------------------------------------------------------------------------------
byte TCbuf::get()
{
if(count)
return pop();
else
return 0;
}
//------------------------------------------------------------------------------
//
/// \note
/// For internal purposes.
/// Use this function with care - it doesn't perform free size check.
//
void TCbuf::push(const byte item)
{
buf[last] = item;
last++;
count++;
if(last == size)
last = 0;
}
//------------------------------------------------------------------------------
//
/// \note
/// For internal purposes.
/// Use this function with care - it doesn't perform free size check.
//
byte TCbuf::pop()
{
byte item = buf[first];
count--;
first++;
if(first == size)
first = 0;
return item;
}
//------------------------------------------------------------------------------