add nano g1 (#1351)

* add nano g1

* Update platformio.ini

* Update configuration.h

* Revert platformio.ini to previous state

* Update configuration.h

* Update platformio.ini

Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>

variants/nano-g1/platformio.ini

@@ -0,0 +1,8 @@
+; The 1.0 release of the nano-g1 board 
+[env:nano-g1]
+extends = esp32_base
+board = ttgo-t-beam
+lib_deps =
+  ${esp32_base.lib_deps}
+build_flags = 
+  ${esp32_base.build_flags} -D NANO_G1  -I variants/nano-g1

variants/nano-g1/variant.h

@@ -0,0 +1,30 @@
+// #define BUTTON_NEED_PULLUP // if set we need to turn on the internal CPU pullup during sleep
+
+#define I2C_SDA 21
+#define I2C_SCL 22
+
+#define BUTTON_PIN 36     // The middle button GPIO on the Nano G1
+//#define BUTTON_PIN_ALT 13 // Alternate GPIO for an external button if needed. Does anyone use this? It is not documented anywhere.
+#define EXT_NOTIFY_OUT 13 // Default pin to use for Ext Notify Module.
+
+// common pinout for their SX1262 vs RF95 modules - both can be enabled and we will probe at runtime for RF95 and if
+// not found then probe for SX1262
+#define USE_RF95
+#define USE_SX1262
+
+#define LORA_DIO0 26 // a No connect on the SX1262 module
+#define LORA_RESET 23
+#define LORA_DIO1 33 // SX1262 IRQ
+#define LORA_DIO2 32 // SX1262 BUSY
+#define LORA_DIO3    // Not connected on PCB
+
+#ifdef USE_SX1262
+#define SX126X_CS RF95_NSS // FIXME - we really should define LORA_CS instead
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+#define SX126X_E22 // Not really an E22 
+// Internally the module hooks the SX1262-DIO2 in to control the TX/RX switch (which is the default for the sx1262interface
+// code)
+#endif
+