Time: chrony replaces timesyncd, with NICT/JP-pool NTP primary and gpsd
SHM as an offline-only refclock; makestep any time and fake-hwclock
cover the battery-less RTC.
Antenna: the modem cleared the supply again after the service set it,
so the service is now idempotent, configurable (ANTENNA=active|passive,
passive keeps it off) and re-checked by a 30 s timer.
gpsd: a gpsdctl udev hook spawned a stray gpsd without -n at boot that
blocked the real service; gpsd.service now binds to the NMEA device.
GNSS: CGNSSMODE=15 (GLONASS, BeiDou, Galileo, QZSS) and all supported
NMEA sentences; both persist across a modem reset. Adds sim7600-at.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
UPS input comes from the ignition-switched socket via a 15 V PD
trigger, so input loss means cranking or ignition off. The INA219
(monitor-only) gives the battery current sign; a host service would mark
cranks, then after a grace period close the recording and power off,
with a voltage floor as backstop. Records the open hardware problem:
after poweroff the UPS keeps the board powered, so it drains and
doesn't auto-start at ignition on.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
15-19 V in, 3S 21700 pass-through UPS with an INA219 that the car unit
sees on I2C bus 7 at 0x41 (read-only check: 12.34 V, idle). Bench test
held the Orin >=20 s across a supply swap. Notes the 20 V PD caveat and
the intended ignition-off shutdown via battery current direction.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An active antenna on the roof received nothing until the modem's
antenna supply was switched on (AT+CVAUXV=3050, AT+CVAUXS=1); then +5.5
dB over the passive one. The settings reset on every modem restart and
AT&W doesn't keep them, so interface 03 is reserved as /dev/sim7600-at
(ModemManager ignores it) and a udev-started oneshot re-applies them.
gpsd now re-attaches via gpsdctl after re-enumeration. Verified with a
live modem reset: antenna, LTE and the GNSS fix all recovered unattended.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
In the car with ignition on, the listen-only probe found 500 kbps (2673
frames in 3 s, zero RX errors; nothing at other rates). The OBD port
isn't gatewayed: 27 periodic IDs, ~893 frames/s. A udev rule now starts
can-up@can_pcan on boot and hot-plug with 500k and listen-only, to be
dropped when obd-poller becomes the single writer.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
500 kbps is the likely era standard but unconfirmed for the Colt, so no
persistent bitrate yet. Adds a listen-only probe (installed on the car
unit as can-bitrate-probe) that cycles common rates without disturbing
the bus, the fallback if the OBD port is gatewayed and silent, and what
to persist once the rate is known.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Summarises the measured cost as roughly 3 s blank per PD state change,
with keep-awake in the app handling sleep, and notes that a marginal
charger renegotiating PD repeatedly would cut the link each time.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
No USB-C detach, one gadget reconnect and a fresh DHCP exchange. With
sleep ruled out, the hub's PD edges cost ~3.5 s (unplug) and ~2.2 s
(plug-in).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Idle on battery, the tablet suspends ~60 s after screen-off and only
answers at its DHCP-renewal wakeups while the USB link stays up. Kept
awake with a video, a PD unplug costs 3.1 s and then nothing. The
earlier replug silences were the tablet waking from sleep.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Unplug causes the full USB-C detach (~3.5 s total). Replug causes no
detach but ~10 s of disruption: the tablet goes silent while the Orin's
link stays up, then reconnects its gadget once. Only an app-level
heartbeat would see the replug outage.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mikkeli
mikkeli