tinySA/os/io/platforms/MSP430/platform.dox

/*
    ChibiOS/RT - Copyright (C) 2006-2007 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/>.
*/

/**
 * @defgroup MSP430 MSP430
 * @details MSP430 port details. This section how the ChibiOS/RT features are
 * implemented on this architecture.
 *
 * @section MSP430_STATES Mapping of the System States in the MSP430 port
 * The ChibiOS/RT logical @ref system_states are mapped as follow in the MSP430
 * 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 enabled. This state is equivalent to the
 *   Suspended state because there are no fast interrupts in this architecture.
 * - <b>Sleep</b>. Not yet implemented.
 * - <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>. The MSP430 has several non
 *   maskable interrupt sources that can be associated to this state.
 * - <b>Halted</b>. Implemented as an infinite loop with interrupts disabled.
 * .
 * @section MSP430_NOTES The MSP430 port notes
 * - The MSP430 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/MSP430/chcore.h</b>.
 * - The state of the hardware multiplier is not saved in the thread context,
 *   make sure to use it in <b>Suspended</b> state (interrupts masked).
 * - The port code does not define the switch to a low power mode for the
 *   idle thread because the MSP430 has several low power modes. You can
 *   select the proper low power mode for you application by defining the
 *   macro @p port_wait_for_interrupt().
 * .
 * @ingroup Ports
 */

/**
 * @defgroup MSP430_CONF Configuration Options
 * @brief MSP430 Configuration Options.
 * @details The MSP430 port allows some architecture-specific configurations
 * settings that can be specified externally, as example on the compiler
 * command line:
 * - @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.<br>
 *   The default value is set into <b>./ports/MSP430/chcore.h</b>.
 * .
 * @ingroup MSP430
 */

/**
 * @defgroup MSP430_CORE Core Port Implementation
 * @brief MSP430 specific port code, structures and macros.
 *
 * @ingroup MSP430
 * @file MSP430/chtypes.h Port types.
 * @file MSP430/chcore.h Port related structures and macros.
 * @file MSP430/chcore.c Port related code.
 */

/**
 * @defgroup MSP430_DRIVERS MSP430 Drivers
 * @brief Device drivers included in the MSP430 support.
 *
 * @ingroup MSP430
 */

/**
 * @defgroup MSP430_PAL I/O Ports Support
 * @brief I/O Ports peripherals support.
 * @details This module supports the MSP430 Digital I/O controller. The
 * controller supports the following features (see @ref PAL):
 * - 8 bits wide ports.
 * - Atomic set/reset/toggle functions because special MSP430 instruction set.
 * - Output latched regardless of the pad setting.
 * - Direct read of input pads regardless of the pad setting.
 * .
 * <h2>Supported Setup Modes</h2>
 * - @p PAL_MODE_RESET.
 * - @p PAL_MODE_UNCONNECTED.
 * - @p PAL_MODE_INPUT.
 * - @p PAL_MODE_OUTPUT_PUSHPULL.
 * .
 * Any attempt to setup an invalid mode is ignored.
 *
 * <h2>Suboptimal Behavior</h2>
 * Some MSP430 I/O ports features are less than optimal:
 * - Bus/group writing is not atomic.
 * - Pad/group mode setup is not atomic.
 * .
 * @ingroup MSP430_DRIVERS
 */

/**
 * @defgroup MSP430_SERIAL USART Support
 * @brief USART support.
 * @details The serial driver supports both the MSP430 USARTs in asynchronous
 * mode.
 *
 * @ingroup MSP430_DRIVERS
 */