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SiRF protocol specification

SiRF protocol is designed by SiRF for GPS material.
I don’t find a really clear specification, then I write it !

Format of SiRF packet :

****************************************************
* begin ** length ** payload ** checksum ** end *
****************************************************

begin (2 bytes) = 0xa0a2
length (2 bytes) = number of bytes in payload
checksum (2 bytes) = XOR of bytes in payload AND 0x7fff
end (2 bytes) = 0xb0b3

Example of SIRF message dump :
a0a2 0009 000000010203040506 0007 b0b3

This entry was posted on Saturday, November 18th, 2006 at 7:18 pm and is filed under English. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

One Response to “SiRF protocol specification”

  1. maytere says:
    August 12, 2010 at 2:39 pm

    Checksum is not XOR of bytes in payload.
    Checksum is sum of bytes in payload;
    For example;
    00+00+00+01+02+03+04+05+06