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drivers/kw2xrf: improve default short address

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This commit is contained in:
PeterKietzmann 2016-05-25 11:55:34 +02:00
parent fe7f173b11
commit ed470e11f8
1 changed files with 8 additions and 2 deletions
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10
drivers/kw2xrf/kw2xrf.c
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@ -404,6 +404,7 @@ int kw2xrf_init(kw2xrf_t *dev, spi_t spi, spi_speed_t spi_speed,
# else
uint8_t cpuid[CPUID_LEN];
#endif
uint16_t addr_short = 0;
eui64_t addr_long;
#endif
@ -435,11 +436,16 @@ int kw2xrf_init(kw2xrf_t *dev, spi_t spi, spi_speed_t spi_speed,
cpuid_get(cpuid);
/* generate short hardware address if CPUID_LEN > 0 */
for (int i = 0; i < CPUID_LEN; i++) {
/* XOR each even byte of the CPUID with LSB of short address
and each odd byte with MSB */
addr_short ^= (uint16_t)(cpuid[i] << ((i & 0x01) * 8));
}
#if CPUID_LEN > IEEE802154_LONG_ADDRESS_LEN
for (int i = IEEE802154_LONG_ADDRESS_LEN; i < CPUID_LEN; i++) {
cpuid[i & 0x07] ^= cpuid[i];
}
#endif
/* make sure we mark the address as non-multicast and not globally unique */
cpuid[0] &= ~(0x01);
@ -447,7 +453,7 @@ int kw2xrf_init(kw2xrf_t *dev, spi_t spi, spi_speed_t spi_speed,
/* copy and set long address */
memcpy(&addr_long, cpuid, IEEE802154_LONG_ADDRESS_LEN);
kw2xrf_set_addr_long(dev, NTOHLL(addr_long.uint64.u64));
kw2xrf_set_addr(dev, NTOHS(addr_long.uint16[0].u16));
kw2xrf_set_addr(dev, addr_short);
#else
kw2xrf_set_addr_long(dev, KW2XRF_DEFAULT_SHORT_ADDR);
kw2xrf_set_addr(dev, KW2XRF_DEFAULT_ADDR_LONG);