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Fix GPS command protocol references: PAIR, not UBX/PMTK

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The RYS352A uses Airoha AG3352 engine with $PAIR proprietary
commands. UBX is u-blox, PMTK is MediaTek — neither applies.
Also document TinyGPS++ v1.1 requirement for GN talker ID
(multi-constellation) support and reference the PAIR command guide.
This commit is contained in:
Ryan Malloy 2026-02-11 16:11:44 -07:00
parent f2c1eb84d2
commit 80158e10d7
1 changed files with 9 additions and 5 deletions
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14
docs/ble-bridge-wiring.md
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@ -224,7 +224,7 @@ ESP32 GND ──► RYS352A GND
| VCC | 3V3 | 3.3V power (onboard LDO on most breakouts) |
| GND | GND | Ground |
| TX | GPIO5 (UART2 RX) | NMEA sentence output at 115200 baud |
| RX | GPIO6 (UART2 TX) | UBX/NMEA config input (optional) |
| RX | GPIO6 (UART2 TX) | PAIR/NMEA config input (optional) |
| PPS | GPIO7 | 1Hz pulse synchronized to GPS time |
**PPS (Pulse Per Second):** The RYS352A outputs a precise 1Hz pulse on the
@ -233,10 +233,14 @@ this edge via interrupt (`micros()` timestamp) for correlating satellite events
with sub-microsecond precision relative to the GPS epoch. The module's RTC
battery backup enables warm starts (~5s) after initial cold start fix (~30-60s).
**UART notes:** The RYS352A defaults to 115200 baud NMEA output. The TX line
(GPIO6) is optional — only needed if you want to send UBX configuration
commands to change update rate, constellation selection, or enable additional
NMEA sentences. The firmware uses TinyGPS++ to parse standard GGA/RMC sentences.
**UART notes:** The RYS352A defaults to 115200 baud NMEA output with `GN`
talker ID (multi-constellation). The TX line (GPIO6) is optional — only needed
to send `$PAIR` proprietary commands (Airoha AG3352 engine) for changing
update rate (`$PAIR050`), constellation selection (`$PAIR066`), PPS config
(`$PAIR752`), or NMEA sentence output rates (`$PAIR062`). See
`docs/RYS352x_PAIR_Command_Guide.md` for the full command reference.
The firmware uses TinyGPS++ v1.1+ to parse standard GGA/RMC sentences —
v1.1 is required for `$GNGGA`/`$GNRMC` (multi-GNSS talker ID) support.
## Full GPIO Map