Roving Networks WIFLY GSX Guide de l'utilisateur télécharger pdf (Page 69)

RN-WIFLYCR-UG

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3.9 TIME STAMPING PACKETS

You can use the time stamping feature to append 8 bytes to a TCP or UDP packet auto-

matically. The set ip flags 0x87 command enables the time stamp and keeps other

default settings). The time stamp bits from MSB to LSB are:

The 8 bytes represents the 64-bit raw value of the real-time clock register. The data is

appended before calculating the TCP checksum so that the data passes through the

TCP stack correctly. This register counts at 32,768 Hz. If the timeserver function is

enabled, the RTC should accurately reflect the real time. This register also counts when

the module is in sleep mode.

User’s TCP or UDP packet data 63..56 55..48 47..40 39..32 31..24 23..16 15..8 7..0

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 121 122

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Roving Networks WIFLY GSX Guide de l'utilisateur Page 69