/**
* 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.interfaces.SpiPacket
Interface: tos.interfaces.SpiPacket
interface SpiPacket
SPI Packet/buffer interface for sending data over an SPI bus. This
interface provides a split-phase send command which can be used for
sending, receiving or both. It is a "send" command because reading
from the SPI requires writing bytes. The send call allows NULL
parameters for receive or send only operations. This interface is
for buffer based transfers where the microcontroller is the master
(clocking) device.
Often, an SPI bus must first be acquired using a Resource interface
before sending commands with SPIPacket. In the case of multiple
devices attached to a single SPI bus, chip select pins are often also
used.
'uint8_t* COUNT_NOK(len) txBuf' A pointer to the buffer to send over the bus. If this
parameter is NULL, then the SPI will send zeroes.
'uint8_t* COUNT_NOK(len) rxBuf' A pointer to the buffer where received data should
be stored. If this parameter is NULL, then the SPI will
discard incoming bytes.
len - Length of the message. Note that non-NULL rxBuf and txBuf
parameters must be AT LEAST as large as len, or the SPI
will overflow a buffer.