Add Heltec T114 GPS support and fix T114 FW

Boards.h

@@ -111,6 +111,7 @@
   #define BOARD_HELTEC_T114   0x3C
   #define MODEL_C6            0xC6 // Heltec Mesh Node T114, 470-510 MHz
   #define MODEL_C7            0xC7 // Heltec Mesh Node T114, 863-928 MHz
+  #define MODEL_CB            0xCB // Heltec Mesh Node T114, 863-928 MHz + GPS
 
   #define PRODUCT_TECHO       0x15 // LilyGO T-Echo devices
   #define BOARD_TECHO         0x44
@@ -131,7 +132,6 @@
   #define EINK_3C 0x03
   #define MONO_OLED 0x04
   #define TFT 0x05
-  #define ADAFRUIT_TFT 0x06
 
   #if defined(ESP32)
     #define PLATFORM PLATFORM_ESP32
@@ -850,6 +850,7 @@
     #elif BOARD_MODEL == BOARD_TDECK
       #define IS_ESP32S3 true
       #define HAS_DISPLAY false
+      #define DISPLAY TFT // to be tested...
       #define HAS_CONSOLE false
       #define HAS_BLUETOOTH false
       #define HAS_BLE true
@@ -1239,7 +1240,6 @@
       #define HAS_BUSY true
       #define HAS_INPUT true
       #define HAS_SLEEP true
-      #define DIO2_AS_RF_SWITCH true
       #define CONFIG_UART_BUFFER_SIZE 6144
       #define CONFIG_QUEUE_SIZE 6144
       #define CONFIG_QUEUE_MAX_LENGTH 200
@@ -1270,7 +1270,7 @@
       // pins for ST7789 display on Heltec T114
       const int DISPLAY_DC = 12;
       const int DISPLAY_CS = 11;
-      const int DISPLAY_MISO = 11;
+      const int DISPLAY_MISO = 11; // not connected
       const int DISPLAY_MOSI = 9;
       const int DISPLAY_CLK = 8;
       const int DISPLAY_BL_PIN = PIN_T114_TFT_BLGT;
@@ -1302,6 +1302,13 @@
               -1  // pin_tcxo_enable
           }
       };
+
+      #if BOARD_VARIANT == MODEL_CB
+      #define HAS_GPS true
+      #define GPS_BAUD_RATE 9600
+      #define PIN_GPS_RX 37
+      #define PIN_GPS_TX 39 
+      #endif
     #else
       #error An unsupported nRF board was selected. Cannot compile RNode firmware.
     #endif

Framing.h

@@ -106,6 +106,11 @@
   #define ERROR_MEMORY_LOW    0x05
   #define ERROR_MODEM_TIMEOUT 0x06
 
+  #define CMD_GPS         0xA0
+
+  #define GPS_CMD_LAT     0x00
+  #define GPS_CMD_LNG     0x01
+
   // Serial logging
   #define LOG_MSG         0x2F
 

Makefile

@@ -54,6 +54,7 @@ prep-nrf:
 	arduino-cli lib install "Crypto"
 	arduino-cli lib install "Adafruit GFX Library"
 	arduino-cli lib install "GxEPD2"
+	arduino-cli lib install "TinyGPSPlus"
 	arduino-cli config set library.enable_unsafe_install true
 	arduino-cli lib install --git-url https://github.com/liamcottle/esp8266-oled-ssd1306#e16cee124fe26490cb14880c679321ad8ac89c95
 	pip install pyserial rns --upgrade --user --break-system-packages # This looks scary, but it's actually just telling pip to install packages as a user instead of trying to install them systemwide, which bypasses the "externally managed environment" error.
@@ -151,6 +152,9 @@ firmware-opencom-xl:
 firmware-heltec_t114:
 	arduino-cli compile --log --fqbn Heltec_nRF52:Heltec_nRF52:HT-n5262 -e --build-property "build.partitions=no_ota" --build-property "upload.maximum_size=2097152" --build-property "compiler.cpp.extra_flags=\"-DBOARD_MODEL=0x3C\""
 
+firmware-heltec_t114_gps:
+	arduino-cli compile --log --fqbn Heltec_nRF52:Heltec_nRF52:HT-n5262 -e --build-property "build.partitions=no_ota" --build-property "upload.maximum_size=2097152" --build-property "compiler.cpp.extra_flags=\"-DBOARD_MODEL=0x3C\" \"-DBOARD_VARIANT=0xCB\""
+
 upload-tbeam:
 	arduino-cli upload -p $(or $(port), /dev/ttyACM0) --fqbn esp32:esp32:t-beam
 	@sleep 1

RNode_Firmware_CE.ino

@@ -46,7 +46,7 @@
     SPIClass interface_spi[1] = {
             // SX1262
             SPIClass(
-                NRF_SPIM3, 
+                NRF_SPIM1, 
                 interface_pins[0][3], 
                 interface_pins[0][1], 
                 interface_pins[0][2]
@@ -132,8 +132,14 @@ void setup() {
       pinMode(PIN_LED_GREEN, OUTPUT);
       pinMode(PIN_LED_BLUE, OUTPUT);
       delay(200);
+    #elif BOARD_MODEL == BOARD_HELTEC_T114
+      delay(200);
+      pinMode(PIN_VEXT_EN, OUTPUT);
+      digitalWrite(PIN_VEXT_EN, HIGH);
+      delay(100);
     #endif
 
+
     if (!eeprom_begin()) { Serial.write("EEPROM initialisation failed.\r\n"); }
   #endif
 
@@ -208,6 +214,11 @@ void setup() {
 
   fifo_init(&packet_rdy_interfaces, packet_rdy_interfaces_buf, MAX_INTERFACES);
 
+  #if HAS_GPS
+  // init GPS
+  gps_s.begin(GPS_BAUD_RATE);
+  #endif
+
   // add call to init_channel_stats here? \todo
 
   // Create and configure interface objects
@@ -1545,7 +1556,7 @@ void loop() {
   process_serial();
 
   #if HAS_DISPLAY
-    #if DISPLAY == OLED
+    #if DISPLAY == OLED || DISPLAY == TFT || DISPLAY == ADAFRUIT_TFT
     if (disp_ready) update_display();
     #elif DISPLAY == EINK_BW || DISPLAY == EINK_3C
     // Display refreshes take so long on e-paper displays that they can disrupt
@@ -1577,6 +1588,20 @@ void loop() {
     input_read();
   #endif
 
+  #if HAS_GPS
+    while (gps_s.available() > 0) {
+      if (gps.encode(gps_s.read()) && millis() - last_gps >= GPS_INTERVAL) {
+          kiss_indicate_location();
+          last_gps = millis();
+      }
+    }
+    if (millis() > 5000 && gps.charsProcessed() < 10) {
+        while (true) {
+            Serial.println(F("No GPS detected: check wiring."));
+        }
+    }
+  #endif
+
   if (memory_low) {
     #if PLATFORM == PLATFORM_ESP32
       if (esp_get_free_heap_size() < 8192) {

Utilities.h

@@ -61,6 +61,10 @@ uint8_t eeprom_read(uint32_t mapped_addr);
 	#include "Input.h"
 #endif
 
+#if HAS_GPS
+    #include "src/misc/gps.h"
+#endif
+
 #if MCU_VARIANT == MCU_ESP32 || MCU_VARIANT == MCU_NRF52
 	#include "Device.h"
 #endif
@@ -1712,6 +1716,33 @@ void unlock_rom() {
 	eeprom_erase();
 }
 
+void kiss_indicate_location() {
+    char location[10];
+    int len;
+    int32_t val;
+    if (gps.location.isValid()) {
+        serial_write(FEND);
+        serial_write(CMD_GPS);
+        serial_write(GPS_CMD_LAT);
+        val = gps.location.lat() * 1000000;
+        escaped_serial_write(val>>24);
+        escaped_serial_write(val>>16);
+        escaped_serial_write(val>>8);
+        escaped_serial_write(val);
+        serial_write(FEND);
+
+        serial_write(FEND);
+        serial_write(CMD_GPS);
+        serial_write(GPS_CMD_LNG);
+        val = gps.location.lng() * 1000000;
+        escaped_serial_write(val>>24);
+        escaped_serial_write(val>>16);
+        escaped_serial_write(val>>8);
+        escaped_serial_write(val);
+        serial_write(FEND);
+    }
+}
+
 void log_debug(const char* msg) {
     serial_write(FEND);
     serial_write(LOG_MSG);

src/misc/gps.h

@@ -0,0 +1,8 @@
+#include <TinyGPSPlus.h>
+#include <SoftwareSerial.h>
+
+#define GPS_INTERVAL 5000 // ms
+
+unsigned long last_gps = 0;
+TinyGPSPlus gps;
+SoftwareSerial gps_s(PIN_GPS_RX, PIN_GPS_TX);