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Fix GPS baud rate: RYS352A defaults to 115200, not 9600

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The AG3352 GNSS engine in the RYS352A ships at 115200 8N1 per
the datasheet spec table. 9600 was a generic assumption that
would cause the UART to read garbage and never acquire a fix.
This commit is contained in:
Ryan Malloy 2026-02-11 16:06:31 -07:00
parent f218cd468b
commit f2c1eb84d2
2 changed files with 3 additions and 3 deletions
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4
docs/ble-bridge-wiring.md
View File

@ -223,7 +223,7 @@ ESP32 GND ──► RYS352A GND
|------------|-----------|----------| |------------|-----------|----------|
| VCC | 3V3 | 3.3V power (onboard LDO on most breakouts) | | VCC | 3V3 | 3.3V power (onboard LDO on most breakouts) |
| GND | GND | Ground | | GND | GND | Ground |
| TX | GPIO5 (UART2 RX) | NMEA sentence output at 9600 baud | | TX | GPIO5 (UART2 RX) | NMEA sentence output at 115200 baud |
| RX | GPIO6 (UART2 TX) | UBX/NMEA config input (optional) | | RX | GPIO6 (UART2 TX) | UBX/NMEA config input (optional) |
| PPS | GPIO7 | 1Hz pulse synchronized to GPS time | | PPS | GPIO7 | 1Hz pulse synchronized to GPS time |
@ -233,7 +233,7 @@ this edge via interrupt (`micros()` timestamp) for correlating satellite events
with sub-microsecond precision relative to the GPS epoch. The module's RTC 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). battery backup enables warm starts (~5s) after initial cold start fix (~30-60s).
**UART notes:** The RYS352A defaults to 9600 baud NMEA output. The TX line **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 (GPIO6) is optional — only needed if you want to send UBX configuration
commands to change update rate, constellation selection, or enable additional commands to change update rate, constellation selection, or enable additional
NMEA sentences. The firmware uses TinyGPS++ to parse standard GGA/RMC sentences. NMEA sentences. The firmware uses TinyGPS++ to parse standard GGA/RMC sentences.

2
firmware/ble-bridge/include/config.h
View File

@ -9,7 +9,7 @@
#define PIN_GPS_RX 5 // ESP32 RX <- GPS TX (NMEA out) #define PIN_GPS_RX 5 // ESP32 RX <- GPS TX (NMEA out)
#define PIN_GPS_TX 6 // ESP32 TX -> GPS RX (config in, optional) #define PIN_GPS_TX 6 // ESP32 TX -> GPS RX (config in, optional)
#define PIN_GPS_PPS 7 // 1Hz PPS rising edge (interrupt) #define PIN_GPS_PPS 7 // 1Hz PPS rising edge (interrupt)
#define GPS_BAUD 9600 #define GPS_BAUD 115200
// I2C Sensor Bus // I2C Sensor Bus
#define PIN_I2C_SDA 8 #define PIN_I2C_SDA 8