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Document firmware GPS initialization
'''U1''' - GPS - [https://www.trimble.com/embeddedsystems/copernicus2.aspx Trimble 63530-50] - 12-channel GPS, 2x serial ports, 2.7-3.3VDC, SBAS, flash almanac/ephemeris/location storage. (The -50 variant is probably a custom variant, and exact capabilities are unknown.)
* This chip defaults to TSIP on the 38400 baud port, which is a binary protocol, and has been captured on this PCB.* [http://ftpserver.org.ru/fileecho/51_EMBED/TSIP.PDF TSIP Protocol Documentation]
''U2 - (Marked G4/905)''
**Triggered by PortA.3
**uses location 0xB2 as a shift register to output LSB first to CC1050's Data Input on PortF.4
=== GPS Initialization ===
On startup, the ST7 sends the following TSIP(0x10 then 0xID, then data with 0x10 double-escaping, then 0x10,0x03) packets to the GPS.
* 0x10, 0x8E, 0x2A, 0x01, 0x10, 0x03
* 0x10, 0x8E, 0x26, 0x10, 0x03
* 0x10, 0x8E, 0x2B, 0x01, 0x10, 0x03
* 0x10, 0x8E, 0x26, 0x10, 0x03
==Modifications==
