add second example fo SPI display on RP

examples/rp/Cargo.toml

@@ -45,6 +45,7 @@ byte-slice-cast = { version = "1.2.0", default-features = false }
 smart-leds = "0.4.0"
 heapless = "0.8"
 usbd-hid = "0.8.1"
+rand_core = "0.6.4"
 
 embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
 embedded-hal-async = "1.0"

examples/rp/src/bin/spi_gc9a01.rs

@@ -0,0 +1,126 @@
+//! This example shows how to use SPI (Serial Peripheral Interface) in the RP2040 chip.
+//!
+//! Example written for a display using the GC9A01 chip. Possibly the Waveshare RP2040-LCD-1.28
+//! (https://www.waveshare.com/wiki/RP2040-LCD-1.28)
+
+#![no_std]
+#![no_main]
+
+use core::cell::RefCell;
+
+use defmt::*;
+use display_interface_spi::SPIInterface;
+use embassy_embedded_hal::shared_bus::blocking::spi::SpiDeviceWithConfig;
+use embassy_executor::Spawner;
+use embassy_rp::clocks::RoscRng;
+use embassy_rp::gpio::{Level, Output};
+use embassy_rp::spi;
+use embassy_rp::spi::{Blocking, Spi};
+use embassy_sync::blocking_mutex::raw::NoopRawMutex;
+use embassy_sync::blocking_mutex::Mutex;
+use embassy_time::{Delay, Duration, Timer};
+use embedded_graphics::image::{Image, ImageRawLE};
+use embedded_graphics::pixelcolor::Rgb565;
+use embedded_graphics::prelude::*;
+use embedded_graphics::primitives::{PrimitiveStyleBuilder, Rectangle};
+use mipidsi::models::GC9A01;
+use mipidsi::options::{ColorOrder, ColorInversion};
+use mipidsi::Builder;
+use rand_core::RngCore;
+use {defmt_rtt as _, panic_probe as _};
+
+const DISPLAY_FREQ: u32 = 64_000_000;
+const LCD_X_RES: i32 = 240;
+const LCD_Y_RES: i32 = 240;
+const FERRIS_WIDTH: u32 = 86;
+const FERRIS_HEIGHT: u32 = 64;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+    let mut rng = RoscRng;
+
+    info!("Hello World!");
+
+    let bl = p.PIN_25;
+    let rst = p.PIN_12;
+    let display_cs = p.PIN_9;
+    let dcx = p.PIN_8;
+    let mosi = p.PIN_11;
+    let clk = p.PIN_10;
+
+    // create SPI
+    let mut display_config = spi::Config::default();
+    display_config.frequency = DISPLAY_FREQ;
+    display_config.phase = spi::Phase::CaptureOnSecondTransition;
+    display_config.polarity = spi::Polarity::IdleHigh;
+
+    let spi: Spi<'_, _, Blocking> = Spi::new_blocking_txonly(p.SPI1, clk, mosi, display_config.clone());
+    let spi_bus: Mutex<NoopRawMutex, _> = Mutex::new(RefCell::new(spi));
+
+    let display_spi = SpiDeviceWithConfig::new(&spi_bus, Output::new(display_cs, Level::High), display_config);
+    let dcx = Output::new(dcx, Level::Low);
+    let rst = Output::new(rst, Level::Low);
+    // dcx: 0 = command, 1 = data
+
+    // Enable LCD backlight
+    let _bl = Output::new(bl, Level::High);
+
+    // display interface abstraction from SPI and DC
+    let di = SPIInterface::new(display_spi, dcx);
+
+    // Define the display from the display interface and initialize it
+    let mut display = Builder::new(GC9A01, di)
+        .display_size(240, 240)
+        .reset_pin(rst)
+        .color_order(ColorOrder::Bgr)
+        .invert_colors(ColorInversion::Inverted)
+        .init(&mut Delay)
+        .unwrap();
+    display.clear(Rgb565::BLACK).unwrap();
+
+    let raw_image_data = ImageRawLE::new(include_bytes!("../../assets/ferris.raw"), FERRIS_WIDTH);
+    let mut ferris = Image::new(&raw_image_data, Point::zero());
+
+    let r = rng.next_u32();
+    let mut delta = Point {
+        x: ((r % 10) + 5) as i32,
+        y: (((r >> 8) % 10) + 5) as i32,
+    };
+    loop {
+        // Move Ferris
+        let bb = ferris.bounding_box();
+        let tl = bb.top_left;
+        let br = bb.bottom_right().unwrap();
+        if tl.x < 0 || br.x > LCD_X_RES {
+            delta.x = -delta.x;
+        }
+        if tl.y < 0 || br.y > LCD_Y_RES {
+            delta.y = -delta.y;
+        }
+
+        // Erase ghosting
+        let style = PrimitiveStyleBuilder::new().fill_color(Rgb565::BLACK).build();
+        let mut off = Point { x: 0, y: 0 };
+        if delta.x < 0 {
+            off.x = FERRIS_WIDTH as i32;
+        }
+        Rectangle::new(tl + off, Size::new(delta.x as u32, FERRIS_HEIGHT))
+            .into_styled(style)
+            .draw(&mut display)
+            .unwrap();
+        off = Point { x: 0, y: 0 };
+        if delta.y < 0 {
+            off.y = FERRIS_HEIGHT as i32;
+        }
+        Rectangle::new(tl + off, Size::new(FERRIS_WIDTH, delta.y as u32))
+            .into_styled(style)
+            .draw(&mut display)
+            .unwrap();
+        // Translate Ferris
+        ferris.translate_mut(delta);
+        // Display the image
+        ferris.draw(&mut display).unwrap();
+        Timer::after(Duration::from_millis(50)).await;
+    }
+}