ili9342c

ILI9342C — a 320×240 RGB565 SPI TFT controller.

The display on the M5Stack Core2. Layer 3: it knows the ILI9342C command set and pixel format, not the SPI controller or DMA engine underneath — those live behind a [DisplayInterface], which the board builds from its SPI + GPIO + DMA and hands in. So this driver is portable to any board that wires an ILI9342C, and the fast path (DMA, chip-select batching) is the interface’s job, not repeated here.

Performance model

There is no framebuffer. A 320×240×2 frame is 150 KB — more than the ESP32’s DMA-reachable DRAM — so this driver streams: it opens one SPI transaction per fill or blit ([DisplayInterface::start]/[end]), sets the address window, and lets the interface DMA the pixels. A solid fill costs no per-pixel CPU work (the interface repeats one packed color); a blit hands the interface the caller’s pixels and the interface overlaps converting the next chunk with transferring the current one. This is the same “no framebuffer, stream windowed regions” model the fast Arduino libraries (TFT_eSPI, LovyanGFX) use, and it is what a future higher-level (LVGL-style) layer would call blit through.

Configuring orientation

[Config] carries rotation, RGB/BGR order and inversion — the three things boards disagree about. The Core2 runs BGR with inversion on; [Config::CORE2] is that, and [Config::default] matches it.

Modules

• color — RGB565 color helpers. Pixels are plain u16 on this driver’s surface (so a

Structs

Config

struct Config {
    pub width: u16,
    pub height: u16,
    pub rotation: Rotation,
    pub color_order: ColorOrder,
    pub invert: bool,
}

Board-specific display facts: native size, rotation, color order, inversion.

Implements: Clone, Copy, Debug, Default

References: ColorOrder, Rotation

Ili9342c

struct Ili9342c<I> { /* private fields */ }

An ILI9342C on a [DisplayInterface].

Enums

ColorOrder

enum ColorOrder {
    Rgb,
    Bgr,
}

Whether the panel’s subpixels are wired red-first or blue-first.

Implements: Clone, Copy, Debug, Eq, PartialEq, StructuralPartialEq

Rotation

enum Rotation {
    Deg0,
    Deg90,
    Deg180,
    Deg270,
}

Display rotation, in 90° steps clockwise from the panel’s native landscape.

Implements: Clone, Copy, Debug, Eq, PartialEq, StructuralPartialEq