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ng_at86rf2xx: compute unique EUI64 from CPUID

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The EUI64 for the at86rfxx is computed from the full CPUID by using
sliding xor.
This commit is contained in:
Oleg Hahm 2015-05-10 21:50:41 +02:00
parent 8658a346bd
commit c45eaf62de
1 changed files with 6 additions and 9 deletions
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15
drivers/ng_at86rf2xx/ng_at86rf2xx.c
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@ -18,12 +18,14 @@
* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
*
* @}
*/
#include "hwtimer.h"
#include "periph/cpuid.h"
#include "byteorder.h"
#include "net/ng_ieee802154.h"
#include "net/ng_netbase.h"
#include "ng_at86rf2xx_registers.h"
@ -87,8 +89,7 @@ void ng_at86rf2xx_reset(ng_at86rf2xx_t *dev)
{
#if CPUID_ID_LEN
uint8_t cpuid[CPUID_ID_LEN];
uint16_t addr_short;
uint64_t addr_long;
eui64_t addr_long;
#endif
/* trigger hardware reset */
@ -101,6 +102,7 @@ void ng_at86rf2xx_reset(ng_at86rf2xx_t *dev)
/* set short and long address */
#if CPUID_ID_LEN
cpuid_get(cpuid);
#if CPUID_ID_LEN < 8
/* in case CPUID_ID_LEN < 8, fill missing bytes with zeros */
for (int i = CPUID_ID_LEN; i < 8; i++) {
@ -116,13 +118,8 @@ void ng_at86rf2xx_reset(ng_at86rf2xx_t *dev)
cpuid[0] |= 0x02;
/* copy and set long address */
memcpy(&addr_long, cpuid, 8);
ng_at86rf2xx_set_addr_long(dev, addr_long);
/* now compress the long addr to form the short address */
for (int i = 2; i < 8; i++) {
cpuid[i & 0x01] ^= cpuid[i];
}
memcpy(&addr_short, cpuid, 2);
ng_at86rf2xx_set_addr_short(dev, addr_short);
ng_at86rf2xx_set_addr_long(dev, NTOHLL(addr_long.uint64.u64));
ng_at86rf2xx_set_addr_short(dev, NTOHS(addr_long.uint16[0].u16));
#else
ng_at86rf2xx_set_addr_long(dev, NG_AT86RF2XX_DEFAULT_ADDR_LONG);
ng_at86rf2xx_set_addr_short(dev, NG_AT86RF2XX_DEFAULT_ADDR_SHORT);