Merge pull request #1358 from meshtastic/gpsfix

Improve T-Echo GPS Handling

platformio.ini

@@ -48,7 +48,7 @@ lib_deps =
   https://github.com/meshtastic/arduino-fsm.git
   https://github.com/meshtastic/SparkFun_Ublox_Arduino_Library.git#31015a55e630a2df77d9d714669c621a5bf355ad
   https://github.com/meshtastic/RadioLib.git#5582ac30578ff3f53f20630a00b2a8a4b8f92c74
-  https://github.com/meshtastic/TinyGPSPlus.git#f0f47067ef2f67c856475933188251c1ef615e79
+  https://github.com/meshtastic/TinyGPSPlus.git
   https://github.com/meshtastic/AXP202X_Library.git#8404abb6d4b486748636bc6ad72d2a47baaf5460
   Wire ; explicitly needed here because the AXP202 library forgets to add it
   SPI

src/gps/GPS.cpp

@@ -41,6 +41,25 @@ bool GPS::setupGPS()
 #endif
 #ifndef NO_ESP32
         _serial_gps->setRxBufferSize(2048); // the default is 256
+#endif
+#ifdef TTGO_T_ECHO
+        // Switch to 4800 baud, then close and reopen port
+        _serial_gps->write("$PCAS01,0*1C\r\n");
+        delay(250);
+        _serial_gps->end();
+        delay(250);
+        _serial_gps->begin(4800);
+        delay(250);
+        // Initialize the L76K Chip, use GPS + GLONASS
+        _serial_gps->write("$PCAS04,5*1C\r\n");
+        delay(250);
+        // only ask for RMC and GGA
+        _serial_gps->write("$PCAS03,1,0,0,0,1,0,0,0,0,0,,,0,0*02\r\n");
+        delay(250);
+        // Switch to Vehicle Mode, since SoftRF enables Aviation < 2g
+        _serial_gps->write("$PCAS11,3*1E\r\n");
+        delay(250);
+
 #endif
     }