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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @defgroup AVR MegaAVR
* @details AVR port for the GCC compiler.
*
* @section AVR_STATES Mapping of the System States in the AVR port
* The ChibiOS/RT logical @ref system_states are mapped as follow in the AVR
* port:
* - <b>Init</b>. This state is represented by the startup code and the
* initialization code before @p chSysInit() is executed. It has not a
* special hardware state associated.
* - <b>Normal</b>. This is the state the system has after executing
* @p chSysInit(). Interrupts are enabled.
* - <b>Suspended</b>. Interrupts are disabled.
* - <b>Disabled</b>. Interrupts are disabled. This state is equivalent to the
* Suspended state because there are no fast interrupts in this architecture.
* - <b>Sleep</b>. This state is entered with the execution of the specific
* instruction @p <b>sleep</b>.
* - <b>S-Locked</b>. Interrupts are disabled.
* - <b>I-Locked</b>. This state is equivalent to the SRI state, the
* @p chSysLockI() and @p chSysUnlockI() APIs do nothing (still use them in
* order to formally change state because this may change).
* - <b>Serving Regular Interrupt</b>. Normal interrupt service code.
* - <b>Serving Fast Interrupt</b>. Not present in this architecture.
* - <b>Serving Non-Maskable Interrupt</b>. Not present in this architecture.
* - <b>Halted</b>. Implemented as an infinite loop with interrupts disabled.
* .
* @section AVR_NOTES The AVR port notes
* - The AVR does not have a dedicated interrupt stack, make sure to reserve
* enough stack space for interrupts in each thread stack. This can be done
* by modifying the @p INT_REQUIRED_STACK macro into
* <b>./ports/AVR/chcore.h</b>.
* .
* @ingroup gcc
*/
/**
* @defgroup AVR_CONF Configuration Options
* @details AVR Configuration Options. The AVR port allows some
* architecture-specific configurations settings that can be overridden
* by redefining them in @p chconf.h. Usually there is no need to change
* the default values.
* - @p INT_REQUIRED_STACK, this value represent the amount of stack space
* used by the interrupt handlers.<br>
* The default for this value is @p 32, this space is allocated for each
* thread so be careful in order to not waste precious RAM space.
* - @p IDLE_THREAD_STACK_SIZE, stack area size to be assigned to the IDLE
* thread. Usually there is no need to change this value unless inserting
* code in the IDLE thread hook macro.
* .
* @ingroup AVR
*/
/**
* @defgroup AVR_CORE Core Port Implementation
* @details AVR specific port code, structures and macros.
*
* @ingroup AVR
*/
/**
* @defgroup AVR_STARTUP Startup Support
* @details ChibiOS/RT doed not provide startup files for the AVR, there
* are no special startup requirement so the normal toolchain-provided
* startup files can be used.
*
* @ingroup AVR
*/
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