Initial commit: Simple Sensor firmware for Heltec T114 with BME280

- MeshCore-based Simple Sensor firmware
- Heltec T114 without display
- BME280 sensor support (temp/humidity/pressure)
- Radio: 868.856018 MHz, SF7, BW62.5 kHz, CR4/7
- 2-byte path hash
- PlatformIO project

variants/thinknode_m1/variant.h

@@ -0,0 +1,143 @@
+/*
+ * variant.h
+ * Copyright (C) 2023 Seeed K.K.
+ * MIT License
+ */
+
+#pragma once
+
+#include "WVariant.h"
+
+////////////////////////////////////////////////////////////////////////////////
+// Low frequency clock source
+
+#define USE_LFXO    // 32.768 kHz crystal oscillator
+#define VARIANT_MCK (64000000ul)
+
+#define WIRE_INTERFACES_COUNT   (1)
+#define PIN_TXCO                (21)
+////////////////////////////////////////////////////////////////////////////////
+// Power
+
+#define PIN_PWR_EN              (12)
+
+#define BATTERY_PIN             (4)
+#define ADC_MULTIPLIER          (4.90F)
+
+#define ADC_RESOLUTION          (14)
+#define BATTERY_SENSE_RES       (12)
+
+#define AREF_VOLTAGE            (3.0)
+
+////////////////////////////////////////////////////////////////////////////////
+// Number of pins
+
+#define PINS_COUNT              (48)
+#define NUM_DIGITAL_PINS        (48)
+#define NUM_ANALOG_INPUTS       (1)
+#define NUM_ANALOG_OUTPUTS      (0)
+
+////////////////////////////////////////////////////////////////////////////////
+// UART pin definition
+
+#define PIN_SERIAL1_RX          PIN_GPS_TX
+#define PIN_SERIAL1_TX          PIN_GPS_RX
+////////////////////////////////////////////////////////////////////////////////
+// I2C pin definition
+
+#define PIN_WIRE_SDA            (26)             // P0.26
+#define PIN_WIRE_SCL            (27)             // P0.27
+
+////////////////////////////////////////////////////////////////////////////////
+// SPI pin definition
+
+#define SPI_INTERFACES_COUNT    (2)
+
+#define PIN_SPI_MISO            (23)
+#define PIN_SPI_MOSI            (22)
+#define PIN_SPI_SCK             (19)
+#define PIN_SPI_NSS             (24)
+
+////////////////////////////////////////////////////////////////////////////////
+// Builtin LEDs
+
+#define LED_RED                 (38)
+#define LED_GREEN               (36)
+#define LED_BLUE                (14)
+
+#define PIN_STATUS_LED          LED_GREEN
+#define LED_BUILTIN             LED_GREEN
+#define PIN_LED                 LED_BUILTIN
+#define LED_PIN                 LED_BUILTIN
+#define LED_STATE_ON            LOW
+
+#define PIN_NEOPIXEL            (14)
+#define NEOPIXEL_NUM            (2)
+
+////////////////////////////////////////////////////////////////////////////////
+// Builtin buttons
+
+#define PIN_BUTTON1             (42)
+#define BUTTON_PIN              PIN_BUTTON1
+#define PIN_USER_BTN            BUTTON_PIN
+
+#define PIN_BUTTON2             (11)
+#define BUTTON_PIN2             PIN_BUTTON2
+
+#define EXTERNAL_FLASH_DEVICES MX25R1635F
+#define EXTERNAL_FLASH_USE_QSPI
+
+////////////////////////////////////////////////////////////////////////////////
+// Lora
+
+#define USE_SX1262
+#define LORA_CS                 (24)
+#define SX126X_DIO1             (20)
+#define SX126X_BUSY             (17)
+#define SX126X_RESET            (25)
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+
+////////////////////////////////////////////////////////////////////////////////
+// SPI1
+
+#define PIN_SPI1_MISO           (38)
+#define PIN_SPI1_MOSI           (29)
+#define PIN_SPI1_SCK            (31)
+
+// GxEPD2 needs that for a panel that is not even used !
+extern const int MISO;
+extern const int MOSI;
+extern const int SCK;
+
+////////////////////////////////////////////////////////////////////////////////
+// QSPI
+#define PIN_QSPI_SCK (46)
+#define PIN_QSPI_CS  (47)
+#define PIN_QSPI_IO0 (44)  // MOSI if using two bit interface
+#define PIN_QSPI_IO1 (45)  // MISO if using two bit interface
+#define PIN_QSPI_IO2 (7)   // WP if using two bit interface (i.e. not used)
+#define PIN_QSPI_IO3 (5)   // HOLD if using two bit interface (i.e. not used)
+
+////////////////////////////////////////////////////////////////////////////////
+// Display
+
+#define DISP_MISO               (38)
+#define DISP_MOSI               (29)
+#define DISP_SCLK               (31)
+#define DISP_CS                 (30)
+#define DISP_DC                 (28)
+#define DISP_RST                (2)
+#define DISP_BUSY               (3)
+#define DISP_BACKLIGHT          (43)
+
+////////////////////////////////////////////////////////////////////////////////
+// GPS
+
+#define PIN_GPS_RX              (40)
+#define PIN_GPS_TX              (41)
+#define GPS_EN                  (34)
+#define PIN_GPS_RESET           (37)
+#define PIN_GPS_PPS             (36)
+#define PIN_GPS_STANDBY         (34)
+#define PIN_GPS_SWITCH          (33)