Preliminary GPS control/build support

Framing.h

@@ -77,6 +77,9 @@
   #define CMD_RESET       0x55
   #define CMD_RESET_BYTE  0xF8
 
+  #define CMD_GPS_CMD     0xA0
+  #define CMD_GPS_RATE    0xA1
+
   #define DETECT_REQ      0x73
   #define DETECT_RESP     0x46
 

Makefile

@@ -130,15 +130,15 @@ firmware-rak4631:
 	arduino-cli compile --log --fqbn rakwireless:nrf52:WisCoreRAK4631Board -e --build-property "build.partitions=no_ota" --build-property "upload.maximum_size=2097152" --build-property "compiler.cpp.extra_flags=\"-DBOARD_MODEL=0x51\""
 
 upload:
-	arduino-cli upload -p /dev/ttyUSB0 --fqbn unsignedio:avr:rnode
+	arduino-cli upload -p /dev/ttyACM0 --fqbn unsignedio:avr:rnode
 
 upload-mega2560:
 	arduino-cli upload -p /dev/ttyACM0 --fqbn arduino:avr:mega
 
 upload-tbeam:
-	arduino-cli upload -p /dev/ttyUSB0 --fqbn esp32:esp32:t-beam
+	arduino-cli upload -p /dev/ttyACM0 --fqbn esp32:esp32:t-beam
 	@sleep 1
-	rnodeconf /dev/ttyUSB0 --firmware-hash $$(./partition_hashes ./build/esp32.esp32.t-beam/RNode_Firmware.ino.bin)
+	rnodeconf /dev/ttyACM0 --firmware-hash $$(./partition_hashes ./build/esp32.esp32.t-beam/RNode_Firmware.ino.bin)
 	@sleep 3
 	python ./Release/esptool/esptool.py --chip esp32 --port /dev/ttyACM0 --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size 4MB 0x210000 ./Release/console_image.bin
 
@@ -252,6 +252,15 @@ release-tbeam: check_bt_buffers
 	zip --junk-paths ./Release/rnode_firmware_tbeam.zip ./Release/esptool/esptool.py ./Release/console_image.bin build/rnode_firmware_tbeam.boot_app0 build/rnode_firmware_tbeam.bin build/rnode_firmware_tbeam.bootloader build/rnode_firmware_tbeam.partitions
 	rm -r build
 
+release-tbeam_GPS: check_bt_buffers
+	arduino-cli compile --fqbn esp32:esp32:t-beam -e --build-property "build.partitions=no_ota" --build-property "upload.maximum_size=2097152" --build-property "compiler.cpp.extra_flags=\"-DBOARD_MODEL=0x33\" \"-DENABLE_GPS\""
+	cp ~/.arduino15/packages/esp32/hardware/esp32/$(ARDUINO_ESP_CORE_VER)/tools/partitions/boot_app0.bin build/rnode_firmware_tbeam_GPS.boot_app0
+	cp build/esp32.esp32.t-beam/RNode_Firmware.ino.bin build/rnode_firmware_tbeam_GPS.bin
+	cp build/esp32.esp32.t-beam/RNode_Firmware.ino.bootloader.bin build/rnode_firmware_tbeam_GPS.bootloader
+	cp build/esp32.esp32.t-beam/RNode_Firmware.ino.partitions.bin build/rnode_firmware_tbeam_GPS.partitions
+	zip --junk-paths ./Release/rnode_firmware_tbeam_GPS.zip ./Release/esptool/esptool.py ./Release/console_image.bin build/rnode_firmware_tbeam_GPS.boot_app0 build/rnode_firmware_tbeam_GPS.bin build/rnode_firmware_tbeam_GPS.bootloader build/rnode_firmware_tbeam_GPS.partitions
+	rm -r build
+
 release-tbeam_sx1262: check_bt_buffers
 	arduino-cli compile --fqbn esp32:esp32:t-beam -e --build-property "build.partitions=no_ota" --build-property "upload.maximum_size=2097152" --build-property "compiler.cpp.extra_flags=\"-DBOARD_MODEL=0x33\" \"-DMODEM=0x03\""
 	cp ~/.arduino15/packages/esp32/hardware/esp32/$(ARDUINO_ESP_CORE_VER)/tools/partitions/boot_app0.bin build/rnode_firmware_tbeam_sx1262.boot_app0

Power.h

@@ -344,7 +344,10 @@ bool init_pmu() {
       PMU->enablePowerOutput(XPOWERS_LDO2);
 
       // Turn on GPS
-      //PMU->enablePowerOutput(XPOWERS_LDO3);
+      #if defined(ENABLE_GPS)
+        PMU->enablePowerOutput(XPOWERS_LDO3);
+        PMU->enablePowerOutput(XPOWERS_VBACKUP); // RTC/GPS battery charging
+      #endif
 
       // protected oled power source
       PMU->setProtectedChannel(XPOWERS_DCDC1);
@@ -385,7 +388,7 @@ bool init_pmu() {
       // Set the power of LoRa and GPS module to 3.3V
       // LoRa
       PMU->setPowerChannelVoltage(XPOWERS_ALDO2, 3300);
-      // GPS
+      // GPS Voltage
       PMU->setPowerChannelVoltage(XPOWERS_ALDO3, 3300);
       PMU->setPowerChannelVoltage(XPOWERS_VBACKUP, 3300);
 
@@ -398,11 +401,15 @@ bool init_pmu() {
       // LoRa VDD
       PMU->enablePowerOutput(XPOWERS_ALDO2);
 
-      // GNSS VDD
+      // GPS/GNSS VDD
-      //PMU->enablePowerOutput(XPOWERS_ALDO3);
+      #if defined(ENABLE_GPS)
+        PMU->enablePowerOutput(XPOWERS_ALDO3);
+      #endif
 
-      // GNSS RTC PowerVDD
+      // GNSS RTC Power - Enables charging onboard battery
-      //PMU->enablePowerOutput(XPOWERS_VBACKUP);
+      #if defined(ENABLE_GPS)
+        PMU->enablePowerOutput(XPOWERS_VBACKUP);
+      #endif
     }
 
     PMU->enableSystemVoltageMeasure();

RNode_Firmware.ino

@@ -41,6 +41,10 @@ volatile bool serial_buffering = false;
   #include "Console.h"
 #endif
 
+#if defined(ENABLE_GPS)
+  #include "GPS.h"
+#endif
+
 #if PLATFORM == PLATFORM_ESP32 || PLATFORM == PLATFORM_NRF52
   #define MODEM_QUEUE_SIZE 4
   typedef struct {
@@ -228,6 +232,10 @@ void setup() {
       kiss_indicate_reset();
     }
   #endif
+      
+  #if defined(ENABLE_GPS)
+    GPS_init();
+  #endif
 
   // Validate board health, EEPROM and config
   validate_status();
@@ -1054,6 +1062,17 @@ void serialCallback(uint8_t sbyte) {
           }
         }
       #endif
+    } else if (command == CMD_GPS_CMD) {
+      #if defined(ENABLE_GPS)
+        GPS_handler(sbyte);
+      #endif
+    } else if (command == CMD_GPS_RATE) {
+      #if defined(ENABLE_GPS)
+        if(frame_len < CMD_L) cmdbuf[frame_len++] = sbyte;
+        if(frame_len == 2){
+          GPS_poling(cmdbuf[0],int(cmdbuf[1]));
+        }
+      #endif
     } else if (command == CMD_DISP_INT) {
       #if HAS_DISPLAY
         if (sbyte == FESC) {
@@ -1475,6 +1494,12 @@ void loop() {
   #if HAS_INPUT
     input_read();
   #endif
+  
+  #if defined(ENABLE_GPS)
+    if(hw_ready){
+      GPS_process(); 
+    }
+  #endif
 
   if (memory_low) {
     #if PLATFORM == PLATFORM_ESP32