Function init_spi_master 

pub fn init_spi_master(
    spi2: SPI2<'static>,
    sck: impl PeripheralOutput<'static>,
    mosi: impl PeripheralOutput<'static>,
    miso: impl PeripheralInput<'static>,
    frequency: HertzU32,
) -> Result<SpiBusInner, SpiInitError>

Initialises the ESP32-S3 SPI2 master bus at the requested frequency.

This is called once during crate::Lilka::init. The SPI2 peripheral is hardwired to three specific GPIOs on the Lilka PCB:

Signal	GPIO
SCK (clock)	GPIO18
MOSI (data out)	GPIO17
MISO (data in)	GPIO8

In async builds the returned bus is automatically converted to async mode via Spi::into_async().

Parameters

• spi2 — Ownership of the SPI2 peripheral token.
• sck / mosi / miso — GPIO peripheral tokens (consumed permanently).
• frequency — Desired bus clock frequency. The hardware rounds to the nearest achievable value. Use values ≤ 80 MHz; the ST7789 display supports up to ~80 MHz but SD cards max out at 25 MHz in standard speed mode.

Returns

Ok(SpiBusInner) on success, or Err(SpiInitError::BusInitFailed).

Example

use lilkaoxide::{init_spi_master, LilkaSpiBus};
use fugit::RateExtU32;

let spi: LilkaSpiBus = init_spi_master(
    peripherals.SPI2,
    peripherals.GPIO18,
    peripherals.GPIO17,
    peripherals.GPIO8,
    60.MHz(),
).expect("SPI init failed");