Module display 

The 1.14“ 240×135 ST7789V2 LCD, in landscape with the keyboard below.

Drawing goes into a Frame in RAM; Display::flush sends only the rows that changed, by DMA straight from the framebuffer (no copy). A full frame is 64 800 bytes, about 13 ms at the 40 MHz SPI clock.

Structs

Display

The LCD driver.

DisplayResources

SPI3, DMA channel 0, and the LCD’s control pins.

Constants

HEIGHT

Landscape height in pixels.

PANEL

How the panel sits in the ST7789’s 240×320 memory, per M5GFX.

ROTATION

Keyboard-below landscape orientation.

SPI_FREQUENCY

SPI clock. GPIO35/36 are routed through the GPIO matrix, not IOMUX, which caps reliable output at 40 MHz (M5GFX uses the same).

WIDTH

Landscape width in pixels.

Functions

framebuffer

try_framebuffer, panicking if it was already taken.

try_framebuffer

The board’s framebuffer, placed in .bss (64.8 KB RAM, zero flash). Returns None after the first call: take it once at start-up and share the &'static mut between apps.

Type Aliases

Error

Display errors.

Frame

A full-screen framebuffer.