Seeed Studio XIAO Display Gadgets

Overview

The Seeed Studio XIAO display gadgets are small carrier boards built around a XIAO Plus module, which is soldered on the board using the additional pads of the XIAO Plus form factor. They combine an IPS LCD with a PDM microphone, an LSM6DS3TR-C 6-axis IMU, user buttons and a LiPo battery connector with a power switch.

Three boards are available, each in a version powered by the XIAO nRF52840 Plus and a version powered by the XIAO ESP32S3 Plus. Both versions of a board connect the display, the buttons and the sensors to the same XIAO pin names, so the same shield describes both.

Shield	Display	Additional features
`seeed_xiao_display_0_96`	0.96” 80x160 IPS LCD (ST7735)
`seeed_xiao_display_1_14`	1.14” 135x240 IPS LCD (ST7789)	Grove I2C connector, third user button
`seeed_xiao_display_1_47`	1.47” 172x320 IPS LCD (JD9853A)	AXS5106L capacitive touch controller, microSD card slot

More information can be found on the XIAO Display Gadgets wiki [1].

XIAO 0.96" IPS Display — XIAO 0.96” IPS Display (Credit: Seeed Studio)

XIAO 1.14" IPS Display — XIAO 1.14” IPS Display (Credit: Seeed Studio)

XIAO 1.47" IPS Touch Display — XIAO 1.47” IPS Touch Display (Credit: Seeed Studio)

Pin Assignments

XIAO pin	0.96” display	1.14” display	1.47” display
D0	Microphone clock	Microphone clock	Microphone clock
D1	Microphone data	Microphone data	Microphone data
D2	LCD SPI CS	LCD SPI CS	LCD SPI CS
D3	LCD data/command	LCD data/command	LCD data/command
D4, D5	I2C SDA, SCL	I2C SDA, SCL	I2C SDA, SCL
D6	USR1 button	USR1 button	microSD SPI CS
D7	USR2 button	USR2 button	Touch interrupt
D8, D10	LCD SPI SCK, MOSI	LCD SPI SCK, MOSI	LCD and microSD SPI SCK, MOSI
D9			microSD SPI MISO
D14	IMU interrupt	IMU interrupt	IMU interrupt
D15			USR2 button
D17	LCD reset	LCD reset	LCD and touch reset
D18	LCD backlight	LCD backlight	LCD backlight
D19		USR3 button	USR1 button

The buttons are available through the sw0 to sw2 aliases, in the order of their USR number, and report INPUT_KEY_0 to INPUT_KEY_2. The IMU is available through the accel0 alias. The backlight is controlled by a fixed regulator enabled at boot.

The touch controller of the 1.47” display is the zephyr,touch chosen node. It shares its reset line with the LCD controller, and this line has no pull-up resistor. Only the display driver drives the line, so applications that use the touch controller must also enable the display driver with CONFIG_DISPLAY.

The XIAO serial interface (xiao_serial) is disabled, as D6 and D7 are used by the boards.

Requirements

These shields can be used with a board that provides the XIAO Plus connector, see seeed,xiao-plus-gpio. The boards are sold with the module soldered, so use the board target that matches the module:

XIAO nRF52840 (Sense) Plus for the nRF52840 versions.

On the XIAO nRF52840 Plus, the shields also enable the PDM microphone, available through the dmic0 alias, and set nfct-pins-as-gpios in the uicr node, as D14 and D15 are the NFC pins of the nRF52840. This UICR setting is kept until the UICR is erased.

Programming

Set --shield to the shield matching the display when you invoke west build. For example, to build the LVGL basic sample sample:

# From the root of the zephyr repository
west build -b xiao_nrf52840_plus --shield seeed_xiao_display_0_96 samples/subsys/display/lvgl
west flash

# From the root of the zephyr repository
west build -b xiao_nrf52840_plus --shield seeed_xiao_display_1_14 samples/subsys/display/lvgl
west flash

# From the root of the zephyr repository
west build -b xiao_nrf52840_plus --shield seeed_xiao_display_1_47 samples/subsys/display/lvgl
west flash