clock.h

//*****************************************************************************
//
// Author		: Konstantin Chizhov
// Date			: 2013
// All rights reserved.

// Redistribution and use in source and binary forms, with or without modification, 
// are permitted provided that the following conditions are met:
// Redistributions of source code must retain the above copyright notice, 
// this list of conditions and the following disclaimer.

// Redistributions in binary form must reproduce the above copyright notice, 
// this list of conditions and the following disclaimer in the documentation and/or 
// other materials provided with the distribution.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
// IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//*****************************************************************************

#pragma once

#if !defined(F_OSC) && !defined(F_CPU)
#warning F_OSC is not defined. Assuming default value 16000000
#define F_OSC  16000000
#endif

#include <__compatibility.h>

namespace Mcucpp
{
	typedef uint32_t clock_freq_t;

namespace Clock
{
	class SysClock
	{
	public:
		
		static clock_freq_t ClockFreq()
		{
		#if defined F_CPU
			return F_CPU;
		#else
			uint8_t lowFuse = ReadLowFuse();
			uint8_t ckSel = 0x0f;
			switch(ckSel)
			{
				case 0x01:
					return 1000000;
				break;
				case 0x02:
					return 2000000;
				break;
				case 0x03:
					return 4000000;
				break;
				case 0x04:
					return 8000000;
				break;
			}
			return F_OSC;
		#endif
		}
	};
}
}