Seeed sensecap indicator support#2568
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Removed links to outdated resources and links
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Update script link in FAQ 4.7 to the repo of the fork
…oard-support Add LilyGo T-ETH Elite SX1262 board support
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Adds a working MeshCore client variant for the Seeed SenseCap Indicator (ESP32-S3, 480×480 RGB LCD, SX1262 LoRa, FT5x06 capacitive touchscreen).
Hardware challenges solved
The SenseCap Indicator has an unusual hardware topology that required custom solutions:
SX1262 via TCA9535 I2C IO Expander
The SX1262's control signals (NSS, RESET, BUSY, DIO1) are not connected to ESP32-S3 GPIO directly — they route through a TCA9535 I2C IO expander at address 0x20. A custom RadioLib HAL (SenseCapHAL) was written to route all digitalWrite/digitalRead calls for those pins through I2C, while using bit-bang SPI on the FSPI data lines (GPIO 41/47/48) to avoid conflicting with the LCD_CAM peripheral used by LovyanGFX.
Shared I2C bus (TCA9535 @ 0x20 + FT5x06 touch @ 0x48)
Both the radio HAL and the LVGL touch callback share Wire. A SemaphoreHandle_t mutex (g_i2c_mutex) is created before radio_init() and passed to both users so they never collide.
ST7701 display orientation
The default lgfx::Panel_ST7701 init sequence leaves the display blank on the SenseCap Indicator because it doesn't apply the required MADCTL (vertical flip) and SDIR (horizontal flip) commands. A subclass Panel_SCIndicator overrides getInitCommands() to inject these extra commands, ported from the Meshtastic LGFX_INDICATOR.h reference.
I2C bus recovery
After LovyanGFX's lcd.begin() finishes the ST7701 init (which uses the same I2C bus for the TCA9535 chip-select), the I2C bus can be left in a stuck state. A 9-clock SCL recovery sequence with explicit STOP condition is run at the start of radio_init() before re-initializing Wire at 400 kHz.
Touch rotation
The FT5x06 reports coordinates in portrait orientation; offset_rotation = 2 (180°) is applied to align the touch coordinates with the landscape display, matching the Meshtastic reference implementation.
ST7701 chip-select via expander
pin_cs for the ST7701 panel is 4 | IO_EXPANDER (TCA9535 bit 4); LovyanGFX bit-bangs this only during lcd.begin(), so there is no runtime conflict with the FSPI radio SPI.
UI
Uses the simple_secure_chat_ui example with a full LVGL 8.3.11 touchscreen interface on the 480×480 display. Screenshots included in variants/sensecap_indicator-espnow/.