115 lines
3.8 KiB
Plaintext
115 lines
3.8 KiB
Plaintext
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 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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/**
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* @defgroup AVR_DRIVERS AVR Drivers
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* @details This section describes all the supported drivers on the AVR
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* platform and the implementation details of the single drivers.
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*
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* @ingroup platforms
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*/
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/**
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* @defgroup AVR_HAL AVR Initialization Support
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* @details On the AVR platform the HAL driver is a stub and does not perform
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* any platform-specific initialization, it still performs the
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* initialization of the other drivers.
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*
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* @ingroup AVR_DRIVERS
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*/
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/**
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* @defgroup AVR_PAL AVR PAL Support
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* @details The AVR PAL driver uses the PORT peripherals.
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*
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* @section avr_pal_1 Supported HW resources
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* - PORTA.
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* - PORTB.
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* - PORTC.
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* - PORTD.
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* - PORTE.
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* - PORTF.
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* - PORTG.
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* .
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* @section avr_pal_2 AVR PAL driver implementation features
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* The AVR PAL driver implementation fully supports the following hardware
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* capabilities:
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* - 8 bits wide ports.
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* - Atomic set/reset functions.
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* - Output latched regardless of the pad setting.
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* - Direct read of input pads regardless of the pad setting.
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* .
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* @section avr_pal_3 Supported PAL setup modes
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* The AVR PAL driver supports the following I/O modes:
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* - @p PAL_MODE_RESET.
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* - @p PAL_MODE_UNCONNECTED.
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* - @p PAL_MODE_INPUT.
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* - @p PAL_MODE_INPUT_PULLUP.
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* - @p PAL_MODE_INPUT_ANALOG.
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* - @p PAL_MODE_OUTPUT_PUSHPULL.
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* .
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* Any attempt to setup an invalid mode is ignored.
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*
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* @section avr_pal_4 Suboptimal behavior
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* The AVR PORT is less than optimal in several areas, the limitations
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* should be taken in account while using the PAL driver:
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* - Pad/port toggling operations are not atomic.
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* - Pad/group mode setup is not atomic.
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* - Group set+reset function is not atomic.
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* - Writing on pads/groups/ports programmed as input with pull-up
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* resistor changes the resistor setting because the output latch is
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* used for resistor selection.
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* - The PORT registers layout on some devices is not regular (it does
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* not have contiguous PIN, DDR, PORT registers in this order), such
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* ports cannot be accessed using the PAL driver. For example, PORT F
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* on ATmega128. Verify the user manual of your device.
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* .
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* @ingroup AVR_DRIVERS
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*/
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/**
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* @defgroup AVR_SERIAL AVR Serial Support
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* @details The AVR Serial driver uses the USART peripherals in a
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* buffered, interrupt driven, implementation.
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*
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* @section avr_serial_1 Supported HW resources
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* The serial driver can support any of the following hardware resources:
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* - USART0.
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* - USART1.
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* .
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* @section avr_serial_2 AVR Serial driver implementation features
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* - Each USART can be independently enabled and programmed.
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* - Fully interrupt driven.
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* .
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* @ingroup AVR_DRIVERS
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*/
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/**
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* @defgroup AVR_I2C AVR I2C Support
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* @details The AVR I2C driver uses the TWI peripheral in an interrupt
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* driven, implementation.
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*
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* @section avr_i2c Supported HW resources
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* The i2c driver can support the following hardware resource:
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* - I2C.
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* .
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* @ingroup AVR_DRIVERS
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*/
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