Besides the header and trailer you need to unescape any embedded DLE's in the
data stream.
/tvb (i5s)
> On Mar 25, 2014, at 2:43 PM, d0ct0r <t...@patoka.org> wrote:
>
>
> Today I spent good part of my time to figure out that my version of
> Thunderbolt has some issue with the TSIP protocol definition. I am using
> following document: "ThunderBolt GPS Disciplined Clock User Guide, Version
> 5.0, Part Number: 35326-30, November 2003"
>
> In that particular PDF file, there is definition for 0x8F-AB TSIP packet
> [section A.10.30 Report Packet 0x8F-AB Primary Timing Packet].
>
> Here is the structure of 8F-AB, translated to plain C-code:
>
>
> typedef struct tb_8f_ab {
> uint8_t sub; //0 : 1
> uint32_t tow; //1-4 : 4
> uint16_t wn; //5-6 : 2
> int16_t ls; //7-8 : 2
> uint8_t tflag; //9 : 1
> uint8_t sec; //10 : 1
> uint8_t min; //11 : 1
> uint8_t hr; //12 : 1
> uint8_t day; //13 : 1
> uint8_t month; //14 : 1
> uint16_t year; //15-16 : 2
> } mytb_8f_ab;
>
>
> Here is the dump I get from my MCU:
>
> //0x10 0x8F 0xAB 0x0 0x3 0x92 0x88 0x6 0xF9 0x0 0x10 0x10 0x3 0x2C 0x1 0x11
> 0x19 0x3 0x7 0xDE 0x10 0x3
> //0x10 0x8F 0xAB 0x0 0x3 0xCC 0x16 0x6 0xF9 0x0 0x10 0x10 0x3 0x12 0x7 0x15
> 0x19 0x3 0x7 0xDE 0x10 0x3
>
> Which is conform to TSIP standard packet definition:
>
> TSIP packet structure is the same for both commands and reports. The packet
> format is:
> <DLE> <id> <data string bytes> <DLE> <ETX>
> Where:
> • <DLE> is the byte 0x10
> • <ETX> is the byte 0x03
> • <id> is a packet identifier byte, which can have any value excepting
> <ETX> and <DLE>.
>
> However, its appeared that my T-Bolt throwing one "extra" byte for the
> so-called "Timing Flags".
> There is 19 bytes coming from my T-Bolt, instead of expected 18. I found that
> actual length of TFLAG is 16 bit - not 8. Interesting enough, that Lady
> Heather works perfectly fine with that T-Bolt !
>
> Can somebody confirm that there is different version of T-Bolt on the market
> ? If so, where I need to look for the documentation for my version ?
>
>
> --
> WBW,
>
> V.P.
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