/** * This file is part of license combination gpl version 3 license and eCos. * The corresponding license terms are below. * * gpl version 3 Licence: * * The file were developed during the student thesis "Datensammlung in Wireless * Sensor Networks fuer Autonomic Home NetworkingÒ of Thomas Kothmayr and is * included in the dissertation "Secure Data Transmission in Wireless * Sensor Networks" by Corinna Schmitt during employment at the Technische * UniversitŠt MŸnchen, Department Computer Science, Chair Network * Architectures and Services (Germany). * Copyright (C) 2013 * Authors: Thomas Kothmayr and Corinna Schmitt (schmitt[at]net.in.tum.de) * * This program 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, version 3 of the License * * This program 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 . * * * eCos Licence: (http://ecos.sourceware.org) * * This file is part of eCos, the Embedded Configurable Operating System. * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, * 2007, 2008, 2009 Free Software Foundation, Inc. * * eCos 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 any later version. * * eCos 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 eCos; if not, write to the Free Software Foundation, Inc., 51 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * As a special exception, if other files instantiate templates or use * macros or inline functions from this file, or you compile this file and * link it with other works to produce a work based on this file, this file * does not by itself cause the resulting work to be covered by the GNU * General Public License. However the source code for this file must still * be made available in accordance with section (3) of the GNU General * Public License v2. * * This exception does not invalidate any other reasons why a work based on * this file might be covered by the GNU General Public License. * */ Interface: tos.chips.atm128.timer.Atm128Calibrate

Interface: tos.chips.atm128.timer.Atm128Calibrate

interface Atm128Calibrate

This interface provides functions to compute ATmega128 configuration values that are clock-rate dependent. These include:

Author:
David Gay

Commands
command uint32_t actualMicro(uint32_t n) Convert values used by AlarmMicro32C Alarms into actual microseconds.
command uint8_t adcPrescaler() Return the smallest ADC prescaler value which guaranteers full ADC precision.
command uint16_t baudrateRegister(uint32_t baudrate) Return the value to use for the baudrate register to achieve a particular baud rate.
command uint32_t calibrateMicro(uint32_t n) Convert n microseconds into a value suitable for use with AlarmMicro32C Alarms.
command uint16_t cyclesPerJiffy() Return CPU cycles per 1/32768s.

Commands - Details

actualMicro

command uint32_t actualMicro(uint32_t n)

Convert values used by AlarmMicro32C Alarms into actual microseconds.

Parameters:
n - A time expressed in AlarmMicro time units.
Returns:
Time in microseconds that corresponds to AlarmMicro argument n.

adcPrescaler

command uint8_t adcPrescaler()

Return the smallest ADC prescaler value which guaranteers full ADC precision.

Returns:
ADC prescaler value.

baudrateRegister

command uint16_t baudrateRegister(uint32_t baudrate)

Return the value to use for the baudrate register to achieve a particular baud rate. Assumes U2X=1 (the USART is being run at double speed).

calibrateMicro

command uint32_t calibrateMicro(uint32_t n)

Convert n microseconds into a value suitable for use with AlarmMicro32C Alarms.

Parameters:
n - Time in microseconds.
Returns:
AlarmMicro argument that best approximates n microseconds.

cyclesPerJiffy

command uint16_t cyclesPerJiffy()

Return CPU cycles per 1/32768s.

Returns:
CPU cycles.