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#!/bin/sh
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#
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# Kneel to zod. :-(
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#
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# The unit powers on in NMEA mode at 4800bps. Ensure our rate is matched.
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# If the Jupiter unit has been cold started, it may be necessary to
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# reset its RTC contents to get correct time output.
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# If NTPD itself has reconfigured the receiver, all bets are off;
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# you will either need to reconfigure it manually, or wait for
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# a full GPS cold start?
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#
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zoddev=/dev/cuau0
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_zod_1330_set_port1_9600='\x32\x05\x00\x00\x01\x00\x01\x00\x00\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf8\xff'
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# Get-out clause:
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#_zod_revert_nmea='\x33\x05\x00\x00\x00\x00\x01\x00\xff\xff'
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#gpsctl -f -t Zodiac -x $_zod_revert_nmea ${PORT}
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stty < ${zoddev}.init speed 4800
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stty < ${zoddev}.lock speed 4800
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# Perform a full bootstrap. Reset the UTC time to what we have.
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# This requires exact arguments (and UTC time) -- see strftime(3).
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# This will also reset the unit to 4800bps if it was in another mode.
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# NOTE: This should probably be done after 'ntpdate' against
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# a trusted reliable source.
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ntpdate -bvu 192.168.1.250
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_zod_time=$(date -u '+%H%M%S')
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_zod_date=$(date -u '+%d%m%g')
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printf > ${zoddev} '$PRWIINIT,A,,,,,,,,,,,,%s,%s\r\n' $_zod_time $_zod_date
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## Perform only a soft set of the date and time
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#printf > ${zoddev} '$PRWIINIT,V,,,,,,,,,,,,%s,%s\r\n' $_zod_time $_zod_date
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# Put the unit into ZODIAC binary mode at 4800bps.
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printf > ${zoddev} '$PRWIIPRO,,RBIN\r\n'
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# Take the unit into 9600bps in binary mode.
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# I'm not convinced that gpsctl does this correctly automatically,
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# so send it a raw ZODIAC packet, trusting it to compute the header OK.
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gpsctl -f -t Zodiac -x $_zod_1330_set_port1_9600 ${zoddev}
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# Finally, leave rate set to 9600 for ntpd.
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stty < ${zoddev}.init speed 9600
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stty < ${zoddev}.lock speed 9600
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