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