feat: variants/seeed_xiao_nrf52840_kit: Diverisfy module options into variants

Signed-off-by: Andrew Yong <me@ndoo.sg>

Author: ndoo

variants/seeed_xiao_nrf52840_kit/platformio.ini

@@ -1,4 +1,5 @@
-; Seeed Xiao BLE: https://www.digikey.com/en/products/detail/seeed-technology-co-ltd/102010448/16652893
+; XIAO nRF52840 & Wio-SX1262 Kit for Meshtastic
+; Store page: https://www.seeedstudio.com/XIAO-nRF52840-Wio-SX1262-Kit-for-Meshtastic-p-6400.html
 [env:seeed_xiao_nrf52840_kit]
 extends = nrf52840_base
 board = xiao_ble_sense
@@ -10,3 +11,21 @@ lib_deps =
 debug_tool = jlink
 ; If not set we will default to uploading over serial (first it forces bootloader entry by talking 1200bps to cdcacm)
 ;upload_protocol = jlink
+
+; With L76K GNSS Module for Seeed Studio XIAO
+; Store page: https://www.seeedstudio.com/L76K-GNSS-Module-for-Seeed-Studio-XIAO-p-5864.html
+[env:seeed_xiao_nrf52840_kit_l76k]
+extends = env:seeed_xiao_nrf52840_kit
+build_flags = ${env:seeed_xiao_nrf52840_kit.build_flags} -DD6D7_L76K
+
+; With I2C (D6 -> SDA, D7 -> SCL)
+[env:seeed_xiao_nrf52840_kit_i2c]
+extends = env:seeed_xiao_nrf52840_kit
+build_flags = ${env:seeed_xiao_nrf52840_kit.build_flags} -DD6D7_I2C
+board_level = extra
+
+; With I2C OLED (D6 -> SDA, D7 -> SCL)
+[env:seeed_xiao_nrf52840_kit_oled]
+extends = env:seeed_xiao_nrf52840_kit
+build_flags = ${env:seeed_xiao_nrf52840_kit.build_flags} -DD6D7_OLED
+board_level = extra

variants/seeed_xiao_nrf52840_kit/variant.h

@@ -22,6 +22,14 @@ extern "C" {
 #define NUM_ANALOG_INPUTS (8) // A6 is used for battery, A7 is analog reference
 #define NUM_ANALOG_OUTPUTS (0)
 
+#ifdef D6D7_OLED
+#define HAS_SCREEN 1
+#define USE_SSD1306
+#else
+// Breaks build:
+// #define HAS_SCREEN 0
+#endif
+
 // LEDs
 
 #define LED_RED 11
@@ -56,14 +64,11 @@ extern "C" {
 #define D9 (9ul)
 #define D10 (10ul)
 
-/*Due to the lack of pins,and have to make sure gps standby work well we have temporarily removed the button.
-There are some technical solutions that can solve this problem,
-and we are currently exploring and researching them*/
-
-// #define BUTTON_PIN D0 // This is the Program Button
-// // #define BUTTON_NEED_PULLUP   1
-// #define BUTTON_ACTIVE_LOW true
-// #define BUTTON_ACTIVE_PULLUP false
+// Wio-SX1262 for XIAO
+// Store page: https://www.seeedstudio.com/Wio-SX1262-for-XIAO-p-6379.html
+// Schematic: https://files.seeedstudio.com/products/SenseCAP/Wio_SX1262/Wio-SX1262%20for%20XIAO%20V1.0_SCH.pdf
+#define PIN_BUTTON1 D0
+#define BUTTON_NEED_PULLUP
 
 /*
  * Analog pins
@@ -85,6 +90,15 @@ static const uint8_t A4 = PIN_A4;
 static const uint8_t A5 = PIN_A5;
 #define ADC_RESOLUTION 12
 
+// RX and TX pins
+#if defined(D6D7_SERIAL1) || defined(D6D7_L76K)
+#define PIN_SERIAL1_RX D6
+#define PIN_SERIAL1_TX D7
+#else
+#define PIN_SERIAL1_RX (-1)
+#define PIN_SERIAL1_TX (-1)
+#endif
+
 #define PIN_SERIAL2_RX (-1)
 #define PIN_SERIAL2_TX (-1)
 
@@ -125,23 +139,32 @@ static const uint8_t SCK = PIN_SPI_SCK;
 #define I2C_NO_RESCAN           // I2C is a bit finicky, don't scan too much
 #define WIRE_INTERFACES_COUNT 1 // 2
 
-#define PIN_WIRE_SDA (24) // change to use the correct pins if needed
-#define PIN_WIRE_SCL (25) // change to use the correct pins if needed
+#if defined(D6D7_I2C) || defined(USE_SSD1306)
+#define PIN_WIRE_SDA D6
+#define PIN_WIRE_SCL D7
+#else
+#define PIN_WIRE_SDA (-1)
+#define PIN_WIRE_SCL (-1)
+#endif
 
 static const uint8_t SDA = PIN_WIRE_SDA;
 static const uint8_t SCL = PIN_WIRE_SCL;
 
-// GPS L76KB
+// L76K GNSS Module for Seeed Studio XIAO
+// Store page: https://www.seeedstudio.com/L76K-GNSS-Module-for-Seeed-Studio-XIAO-p-5864.html
+// Schematic:
+// https://files.seeedstudio.com/wiki/Seeeduino-XIAO-Expansion-Board/GPS_Module/L76K/109100021-L76K-GNSS-Module-for-Seeed-Studio-XIAO-Schematic.pdf
+// -------------------
+#ifdef D6D7_L76K
 #define GPS_L76K
-#ifdef GPS_L76K
-#define PIN_GPS_RX D6
-#define PIN_GPS_TX D7
 #define HAS_GPS 1
 #define GPS_BAUDRATE 9600
 #define GPS_THREAD_INTERVAL 50
-#define PIN_SERIAL1_RX PIN_GPS_TX
-#define PIN_SERIAL1_TX PIN_GPS_RX
 #define PIN_GPS_STANDBY D0
+#undef PIN_BUTTON1 // Overlapping assignment with Wio-SX1262 for XIAO user button
+#define PIN_BUTTON1 (-1)
+#else
+#define HAS_GPS 0
 #endif
 
 // Battery