* fix(gps): match Airoha idle_int sleep to the documented sequence
For boards that wake the AG3352 through idle_int (ThinkNode M8 and M9):
- Drop $PAIR382,1 before the sleep command. It locks the CPU out of
sleep, which works against both $PAIR003 and $PAIR650.
- Hold idle_int low 50 ms before sending, and wait 50 ms after the
command takes before EN cuts the core, as Elecrow's reference does.
- A successful $PAIR650 need not reply, so also accept NMEA going quiet
for a full cycle as success; resend once otherwise.
Boards with RTC_INT are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* ThinkNode M8: reset the GPS out of backup mode at boot
If the MCU resets while the AG3352 is in backup mode, the GPS stays
there and the cached-probe check gets no answer, forcing a full re-probe.
Pulse RESETB in earlyInitVariant(), as the M5 does with its wake pulse
in #12113.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
