Add Hydra specific target to define GPS EN pin and limit tx power (#2608)

* Use DIO2 bridged to TXEN and remove TX/RXEN pin switching altogether

* Add Hydra specific target to limit tx power and define GPS EN

* Whoops

.github/workflows/main_matrix.yml

@@ -66,6 +66,7 @@ jobs:
           - board: heltec-v2_1
           - board: tbeam0_7
           - board: meshtastic-diy-v1
+          - board: hydra
           - board: meshtastic-dr-dev
           - board: nano-g1
           - board: station-g1

variants/diy/hydra/variant.h

@@ -0,0 +1,41 @@
+// For OLED LCD
+#define I2C_SDA 21
+#define I2C_SCL 22
+
+// GPS
+#undef GPS_RX_PIN
+#undef GPS_TX_PIN
+#define GPS_RX_PIN 12
+#define GPS_TX_PIN 15
+#define GPS_UBLOX
+#define PIN_GPS_EN 4
+
+#define BUTTON_PIN 39  // The middle button GPIO on the T-Beam
+#define BATTERY_PIN 35 // A battery voltage measurement pin, voltage divider connected here to measure battery voltage
+#define ADC_CHANNEL ADC1_GPIO35_CHANNEL
+#define ADC_MULTIPLIER 1.85 // (R1 = 470k, R2 = 680k)
+#define EXT_PWR_DETECT 4    // Pin to detect connected external power source for LILYGO® TTGO T-Energy T18 and other DIY boards
+#define EXT_NOTIFY_OUT 12   // Overridden default pin to use for Ext Notify Module (#975).
+#define LED_PIN 2           // add status LED (compatible with core-pcb and DIY targets)
+
+#define LORA_DIO0 26  // a No connect on the SX1262/SX1268 module
+#define LORA_RESET 23 // RST for SX1276, and for SX1262/SX1268
+#define LORA_DIO1 33  // IRQ for SX1262/SX1268
+#define LORA_DIO2 32  // BUSY for SX1262/SX1268
+#define LORA_DIO3     // Not connected on PCB, but internally on the TTGO SX1262/SX1268, if DIO3 is high the TXCO is enabled
+
+#define RF95_SCK 5
+#define RF95_MISO 19
+#define RF95_MOSI 27
+#define RF95_NSS 18
+
+#define USE_SX1262
+
+#define SX126X_CS 18 // NSS for SX126X
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+
+// Set lora.tx_power to 13 for Hydra or other E22 900M30S target due to PA
+#define SX126X_MAX_POWER 13
+#define SX126X_E22

variants/diy/platformio.ini

@@ -34,3 +34,15 @@ build_flags =
   -D DR_DEV
   -D EBYTE_E22
   -I variants/diy/dr-dev
+
+; Hydra - Meshtastic DIY v1 hardware with some specific changes
+[env:hydra]
+extends = esp32_base
+board = esp32doit-devkit-v1
+board_level = extra
+build_flags =
+  ${esp32_base.build_flags}
+  -D DIY_V1
+  -D EBYTE_E22
+  -D GPS_POWER_TOGGLE
+  -I variants/diy/hydra