111 lines
3.7 KiB
Plaintext
111 lines
3.7 KiB
Plaintext
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @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
|
|
*/
|
|
|
|
/**
|
|
* @defgroup AVR_I2C AVR I2C Support
|
|
* @details The AVR I2C driver uses the TWI peripheral in an interrupt
|
|
* driven, implementation.
|
|
*
|
|
* @section avr_i2c Supported HW resources
|
|
* The i2c driver can support the following hardware resource:
|
|
* - I2C.
|
|
* .
|
|
* @ingroup AVR_DRIVERS
|
|
*/
|