Added GPS-Reset

TTGO-T-Beam_GPS-reset/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

TTGO-T-Beam_GPS-reset/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

TTGO-T-Beam_GPS-reset/README.md

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+# TTGO-T-Beam_GPS-reset

TTGO-T-Beam_GPS-reset/platformio.ini

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+[env]
+platform = espressif32 @ 3.0.0
+framework = arduino
+board = ttgo-t-beam
+lib_ldf_mode = deep+
+monitor_speed = 115200
+check_tool = cppcheck
+check_flags =
+    cppcheck: --suppress=*:*.pio\* --inline-suppr
+
+#ESP8266 and ESP32 OLED driver for SSD1306 displays
+[env:ttgo-t-beam-v1]
+lib_deps = 
+	SparkFun u-blox Arduino Library
+	AXP202X_Library
+build_flags = -DT_BEAM_V10
+
+[env:ttgo-t-beam-v0_7]
+lib_deps = SparkFun u-blox Arduino Library
+build_flags = -DT_BEAM_V07

TTGO-T-Beam_GPS-reset/src/T22-GPS-restoreFactory-v2.ino

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+/*************************************************************************
+Original sketch by LilyGO 
+https://github.com/LilyGO/TTGO-T-Beam/tree/master/GPS-T22_v1.0-20190612
+
+Modified by ErikThevking on August 25, 2020. Updated on August 27, 2020.
+
+Purpose: to reset U-blox NEO GPS devices 
+on TTGO T-beam T22- V1.0 and 1.1 and maybe on 0.7 T-beams (uncomment yours)
+This sketch will bring back U-blox GPS N6M & N8M factory settings 
+so that NMEA 9600 over the GPS serial output is enabled.
+
+Thanks to Kizniche for his advice on
+https://github.com/kizniche/ttgo-tbeam-ttn-tracker/issues/20
+
+Based on SparkFun's Ublox Arduino Library and examples
+https://github.com/sparkfun/SparkFun_Ublox_Arduino_Library
+where you can download the necessary SparkFun library.
+
+For T22_v1.0 20190612 and the T22_v1.1 20191212 boards
+As the power management chipset changed, it
+requires the axp20x library that can be found  // AXP192 for T-beam; AXP202 for T-watch
+https://github.com/lewisxhe/AXP202X_Library
+**************************************************************************/
+
+#undef GPS_RX_PIN
+#undef GPS_TX_PIN
+
+#ifdef T_BEAM_V07
+	#define GPS_RX_PIN	12
+	#define GPS_TX_PIN	15
+#endif
+
+#ifdef T_BEAM_V10
+	#include <Wire.h>
+	#include <axp20x.h>
+
+	AXP20X_Class axp;
+
+	#define I2C_SDA		21
+	#define I2C_SCL		22
+	#define GPS_RX_PIN	34
+	#define GPS_TX_PIN	12
+#endif
+
+#include <SparkFun_Ublox_Arduino_Library.h>
+
+SFE_UBLOX_GPS myGPS;
+int state = 0; // steps through states
+HardwareSerial SerialGPS(1);
+
+
+void setup()
+{
+	Serial.begin(115200);
+	while (!Serial);  // Wait for user to open the terminal
+	Serial.println("Connected to Serial");
+
+	#ifdef T_BEAM_V10
+		Wire.begin(I2C_SDA, I2C_SCL);
+		if (!axp.begin(Wire, AXP192_SLAVE_ADDRESS))
+		{
+				Serial.println("AXP192 Begin PASS");
+		} else {
+				Serial.println("AXP192 Begin FAIL");
+		}
+		axp.setPowerOutPut(AXP192_LDO3, AXP202_ON);		// GPS main power
+		axp.setPowerOutPut(AXP192_LDO2, AXP202_ON);		// provides power to GPS backup battery
+		axp.setPowerOutPut(AXP192_LDO3, AXP202_ON);
+		axp.setPowerOutPut(AXP192_DCDC2, AXP202_ON);
+		axp.setPowerOutPut(AXP192_EXTEN, AXP202_ON);
+		axp.setPowerOutPut(AXP192_DCDC1, AXP202_ON);	// enables power to ESP32 on T-beam
+		axp.setPowerOutPut(AXP192_DCDC3, AXP202_ON);	// I foresee similar benefit for restting T-watch 
+														// where ESP32 is on DCDC3 but remember to change I2C pins and GPS pins!
+	#endif 
+	SerialGPS.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
+	Serial.println("All comms started");
+	delay(100);
+
+}
+
+void loop()
+{
+	Serial.println();
+	Serial.print("===== STATE ");
+	Serial.println(state);
+	
+	switch (state)
+	{
+	case 0: // soft solution, should be sufficient and works in most (all) cases
+		do {
+			if (myGPS.begin(SerialGPS))
+			{
+				Serial.println("Connected to GPS");
+				myGPS.setUART1Output(COM_TYPE_NMEA); //Set the UART port to output NMEA only
+				myGPS.saveConfiguration(); //Save the current settings to flash and BBR
+				Serial.println("GPS serial connected, output set to NMEA");
+				myGPS.disableNMEAMessage(UBX_NMEA_GLL, COM_PORT_UART1);
+				myGPS.disableNMEAMessage(UBX_NMEA_GSA, COM_PORT_UART1);
+				myGPS.disableNMEAMessage(UBX_NMEA_GSV, COM_PORT_UART1);
+				myGPS.disableNMEAMessage(UBX_NMEA_VTG, COM_PORT_UART1);
+				myGPS.disableNMEAMessage(UBX_NMEA_RMC, COM_PORT_UART1);
+				myGPS.enableNMEAMessage(UBX_NMEA_GGA, COM_PORT_UART1);
+				myGPS.saveConfiguration(); //Save the current settings to flash and BBR
+				break;
+			}
+			delay(1000);
+		}  while(1);
+		Serial.println("Saved config");
+		state++;
+		break;
+
+	case 1: // hardReset
+		Serial.println("Issuing hardReset (cold start)");
+		myGPS.hardReset();
+		delay(3000);
+		SerialGPS.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
+		if (myGPS.begin(SerialGPS))
+		{
+			Serial.println("Success.");
+			state++;
+		} else {
+			Serial.println("*** GPS did not respond, starting over.");
+			state = 0;
+		}
+		break;
+			
+	case 2: // factoryReset, expect to see GPS back at 9600 baud
+		Serial.println("Issuing factoryReset");
+		myGPS.factoryReset();
+		delay(3000); // takes more than one second... a loop to resync would be best
+		SerialGPS.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
+		if (myGPS.begin(SerialGPS))
+		{
+			Serial.println("Success.");
+			Serial.println("Now GPS has been reset with factory settings,");
+			Serial.println("give us some time to acquire satellites...");
+			Serial.println();
+			state++;
+		} else {
+			Serial.println("*** GPS did not respond, starting over.");
+			state = 0;
+		}
+		break;
+
+	case 3: // lets test
+		for (uint32_t thisNr = 1; thisNr < 300000000; thisNr++)
+		{
+			if (SerialGPS.available()) {
+				Serial.write(SerialGPS.read());  // print anything comes in from the GPS
+			}
+		}
+	}
+}