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#!/bin/sh
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#
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# Initialization script. Good for me. Maybe you too. - bms
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#
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_ubloxdev= /dev/cuaU0
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_gpsctl= gpsctl
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_gpsctl_opts= "-t u-blox"
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### Binary mode config.
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# On USB, accept UBX and NMEA; emit only UBX.
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${_gpsctl} ${_gpsctl_opts} -x \
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'\x06\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x01\x00\x00\x00\x00\x00' ${_ubloxdev}
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# Enable all UBX messages.
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${_gpsctl} ${_gpsctl_opts} -x \
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'\x06\x02\x00\x00\x00\x00\x00\x00\x00\x1F' ${_ubloxdev}
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# Disable all NMEA messages.
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${_gpsctl} ${_gpsctl_opts} -x \
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'\x06\x02\x01\x00\x00\x00\x00\x00\x00\x00' ${_ubloxdev}
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### 1PPS config.
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# Enable 1PPS on +-ve assert, UTC seconds, no antenna/group/user delay factor,
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# undisciplined seconds permitted (!), 100us pulse length.
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# (1PPS is NOT supported on USB without using a separate GPIO line.)
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${_gpsctl} ${_gpsctl_opts} -x \
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'\x06\x07\xE8\x03\x00\x00\x54\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' ${_ubloxdev}
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### Performance tuning.
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# Enable max performance mode.
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${_gpsctl} ${_gpsctl_opts} -x '\x06\x11\x00\x00' ${_ubloxdev}
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# Enable auto 2D/3D fix mode, with 3 sats minimum, 20 sats maximum.
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${_gpsctl} ${_gpsctl_opts} -x \
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'\x06\x23\x00\x00\x44\x00\x00\x00\x00\x00\x00\x00\x03\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' ${_ubloxdev}
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### Localisation for SBAS extra satellite feeds.
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# Astra-5B only (London, UK -- limited sky view.)
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${_gpsctl} ${_gpsctl_opts} -x \
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'\x06\x16\x03\x07\x01\x00\x08\x00\x00\x00' ${_ubloxdev}
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# Now ready to run gpsd on ${_ubloxdev} itself.
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exit 0
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