improved code structure

src/init/spi_display.rs

@@ -0,0 +1,56 @@
+use embassy_rp::{
+    Peri,
+    gpio::{Level, Output},
+    spi::{self, Spi},
+};
+use embassy_time::Timer;
+use embedded_graphics::{pixelcolor::Rgb565, prelude::DrawTarget};
+use embedded_hal_bus::spi::ExclusiveDevice;
+use mipidsi::{
+    Builder,
+    interface::SpiInterface,
+    models::ST7789,
+    options::{Orientation, Rotation},
+};
+use static_cell::StaticCell;
+
+pub async fn init_display(
+    inner: Peri<'static, embassy_rp::peripherals::SPI0>,
+    clk: Peri<'static, embassy_rp::peripherals::PIN_6>,
+    mosi: Peri<'static, embassy_rp::peripherals::PIN_7>,
+    cs: Peri<'static, embassy_rp::peripherals::PIN_5>,
+    dc: Peri<'static, embassy_rp::peripherals::PIN_9>,
+    rst: Peri<'static, embassy_rp::peripherals::PIN_10>,
+) -> Result<impl DrawTarget<Color = Rgb565>, ()> {
+    let mut spi_cfg = spi::Config::default();
+    spi_cfg.frequency = 62_500_000;
+
+    let spi = Spi::new_blocking_txonly(inner, clk, mosi, spi_cfg);
+
+    let cs_display = Output::new(cs, Level::Low);
+    let dc_display = Output::new(dc, Level::Low);
+    let mut rst_display = Output::new(rst, Level::Low);
+
+    rst_display.set_low();
+    Timer::after_millis(10).await;
+    rst_display.set_high();
+    Timer::after_millis(120).await;
+
+    let spi_dev = ExclusiveDevice::new_no_delay(spi, cs_display).expect("Error is Infallible");
+
+    static BUFFER: StaticCell<[u8; 512]> = StaticCell::new();
+    let buffer: &'static mut [u8; 512] = BUFFER.init([0u8; 512]);
+
+    let di = SpiInterface::new(spi_dev, dc_display, buffer);
+
+    static DELAY: StaticCell<embassy_time::Delay> = StaticCell::new();
+    let delay = DELAY.init(embassy_time::Delay);
+
+    let display = Builder::new(ST7789, di)
+        .display_size(240, 320)
+        .orientation(Orientation::new().rotate(Rotation::Deg90))
+        .init(delay)
+        .map_err(|_| ())?; // TODO: pass error
+
+    Ok(display)
+}