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/* Copyright (c) 2007 Eric B. Weddington
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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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* 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: common.h,v 1.3.2.2 2007/07/10 05:04:50 arcanum Exp $ */
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#include <avr/sfr_defs.h>
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This purpose of this header is to define registers that have not been
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previously defined in the individual device IO header files, and to define
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other symbols that are common across AVR device families.
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This file is designed to be included in <avr/io.h> after the individual
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device IO header files, and after <avr/sfr_defs.h>
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/*------------ Registers Not Previously Defined ------------*/
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These are registers that are not previously defined in the individual
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IO header files, OR they are defined here because they are used in parts of
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avr-libc even if a device is not selected but a general architecture has
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Stack pointer register.
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AVR architecture 1 has no RAM, thus no stack pointer.
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All other architectures do have a stack pointer. Some devices have only
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less than 256 bytes of possible RAM locations (128 Bytes of SRAM
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and no option for external RAM), thus SPH is officially "reserved"
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# define SPL _SFR_IO8(0x3D)
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# define SP _SFR_IO8(0x3D)
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# define SP _SFR_IO16(0x3D)
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# define SPH _SFR_IO8(0x3E)
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# endif /* XRAMEND < 0x100 && !defined(__COMPILING_AVR_LIBC__) */
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#endif /* __AVR_ARCH__ != 1 */
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# define SREG _SFR_IO8(0x3F)
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/* SREG bit definitions */
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/* AVR 6 Architecture */
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#if __AVR_ARCH__ == 6
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# define EIND _SFR_IO8(0X3C)
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#endif /* __AVR_ARCH__ == 6 */
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#if defined(__COMPILING_AVR_LIBC__)
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Only few devices come without EEPROM. In order to assemble the
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EEPROM library components without defining a specific device, we
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keep the EEPROM-related definitions here.
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/* EEPROM Control Register */
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# define EECR _SFR_IO8(0x1C)
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/* EEPROM Data Register */
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# define EEDR _SFR_IO8(0x1D)
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/* EEPROM Address Register */
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# define EEAR _SFR_IO16(0x1E)
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# define EEARL _SFR_IO8(0x1E)
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# define EEARH _SFR_IO8(0x1F)
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/* EEPROM Control Register bits */
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#endif /* __COMPILING_AVR_LIBC__ */
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/*------------ Common Symbols ------------*/
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Generic definitions for registers that are common across multiple AVR devices
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/* Pointer registers definitions */
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#if __AVR_ARCH__ != 1 /* avr1 does not have X and Y pointers */
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#endif /* #if __AVR_ARCH__ != 1 */
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/* Status Register */
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# define AVR_STATUS_REG SREG
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# define AVR_STATUS_ADDR _SFR_IO_ADDR(SREG)
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/* Stack Pointer (combined) Register */
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# define AVR_STACK_POINTER_REG SP
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# define AVR_STACK_POINTER_ADDR _SFR_IO_ADDR(SP)
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/* Stack Pointer High Register */
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# define _HAVE_AVR_STACK_POINTER_HI 1
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# define AVR_STACK_POINTER_HI_REG SPH
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# define AVR_STACK_POINTER_HI_ADDR _SFR_IO_ADDR(SPH)
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/* Stack Pointer Low Register */
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# define AVR_STACK_POINTER_LO_REG SPL
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# define AVR_STACK_POINTER_LO_ADDR _SFR_IO_ADDR(SPL)
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# define AVR_RAMPZ_REG RAMPZ
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# define AVR_RAMPZ_ADDR _SFR_IO_ADDR(RAMPZ)
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/* Extended Indirect Register */
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# define AVR_EXTENDED_INDIRECT_REG EIND
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# define AVR_EXTENDED_INDIRECT_ADDR _SFR_IO_ADDR(EIND)
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#endif /* _AVR_COMMON_H */
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include/avr/common.h
