Initial support for the ThinkNode M5 (#7502)

* Initial support for the ThinkNode M5

* Update variants/esp32s3/ELECROW-ThinkNode-M5/platformio.ini

Co-authored-by: Austin <vidplace7@gmail.com>

* Cleanup variant.h for Elecrow Thinknode M5

* Properly detect battery voltage

* Turn backlight off when screen sleeps

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Austin <vidplace7@gmail.com>

variants/esp32s3/ELECROW-ThinkNode-M5/pins_arduino.h

@@ -0,0 +1,28 @@
+// Need this file for ESP32-S3
+// No need to modify this file, changes to pins imported from variant.h
+// Most is similar to https://github.com/espressif/arduino-esp32/blob/master/variants/esp32s3/pins_arduino.h
+
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+#include <variant.h>
+
+#define USB_VID 0x303a
+#define USB_PID 0x1001
+
+// Serial
+static const uint8_t TX = UART_TX;
+static const uint8_t RX = UART_RX;
+
+// Default SPI will be mapped to Radio
+static const uint8_t SS = LORA_CS;
+static const uint8_t SCK = LORA_SCK;
+static const uint8_t MOSI = LORA_MOSI;
+static const uint8_t MISO = LORA_MISO;
+
+// The default Wire will be mapped to PMU and RTC
+static const uint8_t SCL = I2C_SCL;
+static const uint8_t SDA = I2C_SDA;
+
+#endif /* Pins_Arduino_h */

variants/esp32s3/ELECROW-ThinkNode-M5/platformio.ini

@@ -0,0 +1,21 @@
+[env:thinknode_m5]
+extends = esp32s3_base
+board = ESP32-S3-WROOM-1-N4
+build_flags =
+  ${esp32s3_base.build_flags}
+  -D ELECROW_ThinkNode_M5
+  -I variants/esp32s3/ELECROW-ThinkNode-M5
+  -DEINK_DISPLAY_MODEL=GxEPD2_154_D67
+  -DEINK_WIDTH=200
+  -DEINK_HEIGHT=200
+  -DUSE_EINK_DYNAMICDISPLAY            ; Enable Dynamic EInk
+  -DEINK_LIMIT_FASTREFRESH=10          ; How many consecutive fast-refreshes are permitted    //20
+  -DEINK_LIMIT_RATE_BACKGROUND_SEC=10  ; Minimum interval between BACKGROUND updates          //30
+  -DEINK_LIMIT_RATE_RESPONSIVE_SEC=1   ; Minimum interval between RESPONSIVE updates
+;   -DEINK_LIMIT_GHOSTING_PX=2000        ; (Optional) How much image ghosting is tolerated
+  -DEINK_BACKGROUND_USES_FAST          ; (Optional) Use FAST refresh for both BACKGROUND and RESPONSIVE, until a limit is reached.
+
+lib_deps = ${esp32s3_base.lib_deps}
+  https://github.com/meshtastic/GxEPD2/archive/1655054ba298e0e29fc2044741940f927f9c2a43.zip
+  lewisxhe/PCF8563_Library@^1.0.1
+  maxpromer/PCA9557-arduino @ ^1.0.0

variants/esp32s3/ELECROW-ThinkNode-M5/variant.h

@@ -0,0 +1,83 @@
+#ifndef ELECROW_ThinkNode_M5_VAR
+#define ELECROW_ThinkNode_M5_VAR
+
+#define UART_TX 43
+#define UART_RX 44
+
+// LED
+// Both of these are on the GPIO expander
+#define PCA_LED_USER 1  // the Blue LED
+#define PCA_LED_POWER 3 // the Red LED? Seems to have hardware logic to blink when USB is plugged in.
+
+// USB_CHECK
+#define EXT_PWR_DETECT 12
+#define BATTERY_PIN 8
+#define ADC_CHANNEL ADC1_GPIO8_CHANNEL
+
+#define PIN_BUZZER 9
+
+// Buttons
+
+#define PIN_BUTTON2 14
+#define PIN_BUTTON1 21
+
+// Wire Interfaces
+
+#define I2C_SCL 1
+#define I2C_SDA 2
+
+// GPS pins
+#define GPS_SWITH 10
+#define HAS_GPS 1
+#define GPS_L76K
+#define PIN_GPS_REINIT 13 // An output to reset L76K GPS. As per datasheet, low for > 100ms will reset the L76K
+
+#define PIN_GPS_STANDBY 11 // An output to wake GPS, low means allow sleep, high means force wake
+
+#define GPS_TX_PIN 20 // This is for bits going TOWARDS the CPU
+#define GPS_RX_PIN 19 // This is for bits going TOWARDS the GPS
+
+#define GPS_THREAD_INTERVAL 50
+
+#define PIN_SERIAL1_RX GPS_TX_PIN
+#define PIN_SERIAL1_TX GPS_RX_PIN
+
+// PCF8563 RTC Module
+#define PCF8563_RTC 0x51
+
+#define SX126X_CS 17
+#define LORA_SCK 16
+#define LORA_MOSI 15
+#define LORA_MISO 7
+#define SX126X_RESET 6
+#define SX126X_BUSY 5
+#define SX126X_DIO1 4
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 3.3
+#define SX126X_POWER_EN 46
+#define SX126X_MAX_POWER 22 // SX126xInterface.cpp defaults to 22 if not defined, but here we define it for good practice
+#define USE_SX1262
+#define LORA_CS SX126X_CS // FIXME: for some reason both are used in /src
+#define LORA_DIO1 SX126X_DIO1
+
+#define USE_EINK
+#define PIN_EINK_EN -1    // Note: this is really just backlight power
+#define PCA_PIN_EINK_EN 5 // This is the pin number on the GPIO expander
+#define PIN_EINK_CS 39
+#define PIN_EINK_BUSY 42
+#define PIN_EINK_DC 40
+#define PIN_EINK_RES 41
+#define PIN_EINK_SCLK 38
+#define PIN_EINK_MOSI 45 // also called SDI
+
+// Controls power for all peripherals (eink + GPS + LoRa + Sensor)
+#define PIN_POWER_EN -1
+#define PCA_PIN_POWER_EN 4 // This is the pin number on the GPIO expander
+
+#define PIN_SPI_MISO 7
+#define PIN_SPI_MOSI 15
+#define PIN_SPI_SCK 16
+
+#define BUTTON_PIN PIN_BUTTON1
+#define BUTTON_PIN_ALT PIN_BUTTON2
+#endif