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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_DRIVERS AVR Drivers
* @details This section describes all the supported drivers on the AVR
* platform and the implementation details of the single drivers.
*
* @ingroup platforms
*/
/**
* @defgroup AVR_HAL AVR Initialization Support
* @details On the AVR platform the HAL driver is a stub and does not perform
* any platform-specific initialization, it still performs the
* initialization of the other drivers.
*
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_PAL AVR PAL Support
* @details The AVR PAL driver uses the PORT peripherals.
*
* @section avr_pal_1 Supported HW resources
* - PORTA.
* - PORTB.
* - PORTC.
* - PORTD.
* - PORTE.
* - PORTF.
* - PORTG.
* .
* @section avr_pal_2 AVR PAL driver implementation features
* The AVR PAL driver implementation fully supports the following hardware
* capabilities:
* - 8 bits wide ports.
* - Atomic set/reset functions.
* - Output latched regardless of the pad setting.
* - Direct read of input pads regardless of the pad setting.
* .
* @section avr_pal_3 Supported PAL setup modes
* The AVR PAL driver supports the following I/O modes:
* - @p PAL_MODE_RESET.
* - @p PAL_MODE_UNCONNECTED.
* - @p PAL_MODE_INPUT.
* - @p PAL_MODE_INPUT_PULLUP.
* - @p PAL_MODE_INPUT_ANALOG.
* - @p PAL_MODE_OUTPUT_PUSHPULL.
* .
* Any attempt to setup an invalid mode is ignored.
*
* @section avr_pal_4 Suboptimal behavior
* The AVR PORT is less than optimal in several areas, the limitations
* should be taken in account while using the PAL driver:
* - Pad/port toggling operations are not atomic.
* - Pad/group mode setup is not atomic.
* - Group set+reset function is not atomic.
* - Writing on pads/groups/ports programmed as input with pull-up
* resistor changes the resistor setting because the output latch is
* used for resistor selection.
* - The PORT registers layout on some devices is not regular (it does
* not have contiguous PIN, DDR, PORT registers in this order), such
* ports cannot be accessed using the PAL driver. For example, PORT F
* on ATmega128. Verify the user manual of your device.
* .
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_SERIAL AVR Serial Support
* @details The AVR Serial driver uses the USART peripherals in a
* buffered, interrupt driven, implementation.
*
* @section avr_serial_1 Supported HW resources
* The serial driver can support any of the following hardware resources:
* - USART0.
* - USART1.
* .
* @section avr_serial_2 AVR Serial driver implementation features
* - Each USART can be independently enabled and programmed.
* - Fully interrupt driven.
* .
* @ingroup AVR_DRIVERS
*/
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