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Improve documentation for the CC2538 IEEE address re-ordering

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This commit is contained in:
George Oikonomou 2014-06-06 18:33:28 +01:00
parent 5acc20fc47
commit 9d7c3b9866
1 changed files with 15 additions and 3 deletions
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18
cpu/cc2538/ieee-addr.c
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@ -49,9 +49,21 @@ ieee_addr_cpy_to(uint8_t *dst, uint8_t len)
memcpy(dst, &ieee_addr_hc[8 - len], len);
} else {
/* Verify if we detect TI OUI in fourth position. TI store the MAC @ on
two parts (4 bytes LSB first and 4 bytes MSB) in this case, we need
to flip the 2 parts */
/*
* 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]