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include
avr
xmega.h
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/* Copyright (c) 2012 Joerg Wunsch
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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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)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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/* $Id: xmega.h 2404 2013-09-09 10:17:18Z joerg_wunsch $ */
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/*
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* This file is included by <avr/io.h> whenever compiling for an Xmega
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* device. It abstracts certain features common to the Xmega device
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* families.
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*/
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#ifndef _AVR_XMEGA_H
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#define _AVR_XMEGA_H
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#ifdef __DOXYGEN__
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/**
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\def _PROTECTED_WRITE
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\ingroup avr_io
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Write value \c value to IO register \c reg that is protected through
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the Xmega configuration change protection (CCP) mechanism. This
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implements the timed sequence that is required for CCP.
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Example to modify the CPU clock:
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\code
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#include <avr/io.h>
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_PROTECTED_WRITE(CLK_PSCTRL, CLK_PSADIV0_bm);
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_PROTECTED_WRITE(CLK_CTRL, CLK_SCLKSEL0_bm);
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\endcode
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*/
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#define _PROTECTED_WRITE(reg, value)
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#else
/* !__DOXYGEN__ */
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#define _PROTECTED_WRITE(reg, value) \
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__asm__ __volatile__("out %[ccp], %[ccp_ioreg]" "\n\t" \
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"sts %[ioreg], %[val]" \
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: \
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: [ccp] "I" (_SFR_IO_ADDR(CCP)), \
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[ccp_ioreg] "d" (CCP_IOREG_gc), \
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[ioreg] "M" (_SFR_MEM_ADDR(reg)), \
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[val] "r" (value))
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#endif
/* DOXYGEN */
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#endif
/* _AVR_XMEGA_H */
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