N900 GPS Reverse Engineering
(what I learned so far) |
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| Line 26: | Line 26: | ||
S---------- DL---------------------- | S---------- DL---------------------- | ||
| - | S = Static, unchanging normally | + | *S = Static, unchanging normally |
| - | MS = Mostly static, varying in value normally slightly | + | *MS = Mostly static, varying in value normally slightly |
| - | SS = Sometimes static, completely different values sometimes | + | *SS = Sometimes static, completely different values sometimes |
| - | I = Incrementing | + | *I = Incrementing |
| - | MI = Incrementing, but not every packet | + | *MI = Incrementing, but not every packet |
| - | D = Decrementing | + | *D = Decrementing |
| - | MD = Decrementing, but not every packet | + | *MD = Decrementing, but not every packet |
| - | TS = Time-sensitive; changes over (short) durations of time | + | *TS = Time-sensitive; changes over (short) durations of time |
| - | TL = Time-sensitive, longer duration | + | *TL = Time-sensitive, longer duration |
| - | T3 = " | + | *T3 = " |
| - | DS = Distance-sensitive; changes over at least 30m distance | + | *DS = Distance-sensitive; changes over at least 30m distance |
| - | DL = Distance-sensitive, like across the world; TEMP; *or* T4 | + | *DL = Distance-sensitive, like across the world; TEMP; *or* T4 |
| - | 19,1a = 0000-e678 (hex) | + | *19,1a = 0000-e678 (hex) |
| - | 20 = | + | *20 = |
| - | 22,23 = | + | *22,23 = |
| - | 28 = | + | *28 = |
| - | 2b,2c = 0590-12a9 (hex) | + | *2b,2c = 0590-12a9 (hex) |
| - | 2e,2f = eph (cm) | + | *2e,2f = eph (cm) |
| - | 30 = | + | *30 = |
| - | 35 = | + | *35 = |
| - | 3c,3d = track: Direction of motion in hundredths of a degree | + | *3c,3d = track: Direction of motion in hundredths of a degree |
| - | 3e,3f = epd: Track accuracy (in hundredths?) | + | *3e,3f = epd: Track accuracy (in hundredths?) |
| - | 43 = | + | *43 = |
| - | 45 = | + | *45 = |
Revision as of 14:37, 21 July 2010
| 00000 00 92 01 00 00 00 00 xx 05 00 00 00 09 03 00 10
S------------------- DL S----------------------
| 00010 07 da 07 15 00 xx xx 00 xx xx 00 00 09 02 00 1c
S------------- TL TS -- S----------------
| 00020 xx xx xx xx xx xx xx xx 00 00 xx xx 00 00 08 8b
DL--- DL--- TS S---- S---- ^eph^
| 00030 xx 00 xx xx xx xx xx xx 09 04 00 14 62 7e xx xx
S- DL TS--- DL MS S---------- track SS---
| 00040 xx xx 00 xx xx xx 00 xx 00 xx 00 00 09 05 00 74
DL--- S- TL S- DS S- DS S----------------
| 00050 09 00 00 00 00 02 xx xx 00 xx xx xx xx xx 00 00
S---------------- DL MS S- TS--- I TS MI S----
| 00060 00 04 xx xx xx xx xx xx xx xx 00 00 00 xx xx xx
S---- T3 TS S- TL TS MS TS MD S------- DL TS---
| 00070 00 xx xx xx xx xx 00 00 00 xx xx xx 00 03 xx xx
S- TS--- I TS MS S-------- T3 MS MS S---- TS MS
| 00080 xx xx 00 00 00 xx xx xx 00 xx xx xx xx xx 00 00
TS MD S------- T3 TS MS S- TS--- MS TS MI S----
| 00090 00 xx xx xx 00 03 xx xx xx xx 00 00 00 xx xx xx
S- TS------ S---- TS MD TS MS S------- TS SS+TS
| 000a0 00 xx xx xx xx xx 00 00 00 xx xx xx 00 xx xx xx
S- TL TS MS TS MD S-------- TS------ S- TL TS MI
| 000b0 xx xx 00 00 00 xx xx xx 00 xx xx xx xx xx 00 00
TS--- S------- TS--- MS S- TS--- MI TS MS S----
| 000c0 09 08 00 0c xx xx xx xx xx xx xx xx
S---------- DL----------------------
- S = Static, unchanging normally
- MS = Mostly static, varying in value normally slightly
- SS = Sometimes static, completely different values sometimes
- I = Incrementing
- MI = Incrementing, but not every packet
- D = Decrementing
- MD = Decrementing, but not every packet
- TS = Time-sensitive; changes over (short) durations of time
- TL = Time-sensitive, longer duration
- T3 = "
- DS = Distance-sensitive; changes over at least 30m distance
- DL = Distance-sensitive, like across the world; TEMP; *or* T4
- 19,1a = 0000-e678 (hex)
- 20 =
- 22,23 =
- 28 =
- 2b,2c = 0590-12a9 (hex)
- 2e,2f = eph (cm)
- 30 =
- 35 =
- 3c,3d = track: Direction of motion in hundredths of a degree
- 3e,3f = epd: Track accuracy (in hundredths?)
- 43 =
- 45 =