nes-proj/arch/cpu/cc2538/ieee-addr.c

90 lines
3.3 KiB
C

/*
* Copyright (c) 2013, Texas Instruments Incorporated - http://www.ti.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc2538-ieee-addr
* @{
*
* \file
* Driver for the cc2538 IEEE addresses
*/
#include "contiki.h"
#include "net/linkaddr.h"
#include "ieee-addr.h"
#include <stdint.h>
#include <string.h>
/*---------------------------------------------------------------------------*/
void
ieee_addr_cpy_to(uint8_t *dst, uint8_t len)
{
if(IEEE_ADDR_CONF_HARDCODED) {
uint8_t ieee_addr_hc[8] = IEEE_ADDR_CONF_ADDRESS;
memcpy(dst, &ieee_addr_hc[8 - len], len);
} else {
/*
* By default, we assume that the IEEE address is stored on flash using
* little-endian byte order.
*
* However, some SoCs ship with a different byte order, whereby the first
* four bytes are flipped with the four last ones.
*
* Using this address as an example: 00 12 4B 00 01 02 03 04
* We expect it stored as: 04 03 02 01 00 4B 12 00
* But it is also possible to encounter: 00 4B 12 00 04 03 02 01
*
* Thus: read locations [3, 2, 1] and if we encounter the TI OUI, flip the
* order of the two 4-byte sequences. Each of the 4-byte sequences is still
* little-endian.
*/
int i;
uint8_t oui_ti[3] = IEEE_ADDR_OUI_TI;
if(((uint8_t *)IEEE_ADDR_LOCATION)[3] == oui_ti[0]
&& ((uint8_t *)IEEE_ADDR_LOCATION)[2] == oui_ti[1]
&& ((uint8_t *)IEEE_ADDR_LOCATION)[1] == oui_ti[2]) {
for(i = 0; i < len; i++) {
dst[len - i - 1] = ((uint8_t *)IEEE_ADDR_LOCATION)[i < 4 ? i + 4 : i - 4];
}
} else {
for(i = 0; i < len; i++) {
dst[i] = ((uint8_t *)IEEE_ADDR_LOCATION)[len - 1 - i];
}
}
}
#if IEEE_ADDR_NODE_ID
dst[len - 1] = IEEE_ADDR_NODE_ID & 0xFF;
dst[len - 2] = IEEE_ADDR_NODE_ID >> 8;
#endif
}
/** @} */