314 lines
9.1 KiB
Rust
314 lines
9.1 KiB
Rust
//! This example shows how to use SPI (Serial Peripheral Interface) in the RP2040 chip.
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//!
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//! Example written for a display using the ST7789 chip. Possibly the Waveshare Pico-ResTouch
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//! (https://www.waveshare.com/wiki/Pico-ResTouch-LCD-2.8)
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use core::cell::RefCell;
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use defmt::*;
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use embassy_embedded_hal::shared_bus::blocking::spi::SpiDeviceWithConfig;
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use embassy_executor::Spawner;
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use embassy_rp::gpio::{Level, Output};
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use embassy_rp::spi;
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use embassy_rp::spi::{Blocking, Spi};
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use embassy_sync::blocking_mutex::raw::NoopRawMutex;
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use embassy_sync::blocking_mutex::Mutex;
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use embassy_time::Delay;
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use embedded_graphics::image::{Image, ImageRawLE};
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use embedded_graphics::mono_font::ascii::FONT_10X20;
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use embedded_graphics::mono_font::MonoTextStyle;
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use embedded_graphics::pixelcolor::Rgb565;
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use embedded_graphics::prelude::*;
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use embedded_graphics::primitives::{PrimitiveStyleBuilder, Rectangle};
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use embedded_graphics::text::Text;
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use st7789::{Orientation, ST7789};
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use {defmt_rtt as _, panic_probe as _};
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use crate::my_display_interface::SPIDeviceInterface;
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use crate::touch::Touch;
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const DISPLAY_FREQ: u32 = 64_000_000;
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const TOUCH_FREQ: u32 = 200_000;
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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info!("Hello World!");
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let bl = p.PIN_13;
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let rst = p.PIN_15;
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let display_cs = p.PIN_9;
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let dcx = p.PIN_8;
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let miso = p.PIN_12;
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let mosi = p.PIN_11;
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let clk = p.PIN_10;
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let touch_cs = p.PIN_16;
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//let touch_irq = p.PIN_17;
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// create SPI
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let mut display_config = spi::Config::default();
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display_config.frequency = DISPLAY_FREQ;
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display_config.phase = spi::Phase::CaptureOnSecondTransition;
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display_config.polarity = spi::Polarity::IdleHigh;
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let mut touch_config = spi::Config::default();
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touch_config.frequency = TOUCH_FREQ;
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touch_config.phase = spi::Phase::CaptureOnSecondTransition;
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touch_config.polarity = spi::Polarity::IdleHigh;
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let spi: Spi<'_, _, Blocking> = Spi::new_blocking(p.SPI1, clk, mosi, miso, touch_config.clone());
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let spi_bus: Mutex<NoopRawMutex, _> = Mutex::new(RefCell::new(spi));
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let display_spi = SpiDeviceWithConfig::new(&spi_bus, Output::new(display_cs, Level::High), display_config);
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let touch_spi = SpiDeviceWithConfig::new(&spi_bus, Output::new(touch_cs, Level::High), touch_config);
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let mut touch = Touch::new(touch_spi);
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let dcx = Output::new(dcx, Level::Low);
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let rst = Output::new(rst, Level::Low);
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// dcx: 0 = command, 1 = data
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// Enable LCD backlight
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let _bl = Output::new(bl, Level::High);
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// display interface abstraction from SPI and DC
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let di = SPIDeviceInterface::new(display_spi, dcx);
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// create driver
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let mut display = ST7789::new(di, rst, 240, 320);
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// initialize
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display.init(&mut Delay).unwrap();
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// set default orientation
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display.set_orientation(Orientation::Landscape).unwrap();
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display.clear(Rgb565::BLACK).unwrap();
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let raw_image_data = ImageRawLE::new(include_bytes!("../../assets/ferris.raw"), 86);
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let ferris = Image::new(&raw_image_data, Point::new(34, 68));
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// Display the image
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ferris.draw(&mut display).unwrap();
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let style = MonoTextStyle::new(&FONT_10X20, Rgb565::GREEN);
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Text::new(
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"Hello embedded_graphics \n + embassy + RP2040!",
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Point::new(20, 200),
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style,
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)
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.draw(&mut display)
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.unwrap();
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loop {
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if let Some((x, y)) = touch.read() {
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let style = PrimitiveStyleBuilder::new().fill_color(Rgb565::BLUE).build();
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Rectangle::new(Point::new(x - 1, y - 1), Size::new(3, 3))
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.into_styled(style)
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.draw(&mut display)
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.unwrap();
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}
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}
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}
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/// Driver for the XPT2046 resistive touchscreen sensor
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mod touch {
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use embedded_hal_1::spi::{Operation, SpiDevice};
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struct Calibration {
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x1: i32,
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x2: i32,
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y1: i32,
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y2: i32,
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sx: i32,
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sy: i32,
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}
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const CALIBRATION: Calibration = Calibration {
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x1: 3880,
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x2: 340,
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y1: 262,
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y2: 3850,
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sx: 320,
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sy: 240,
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};
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pub struct Touch<SPI: SpiDevice> {
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spi: SPI,
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}
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impl<SPI> Touch<SPI>
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where
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SPI: SpiDevice,
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{
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pub fn new(spi: SPI) -> Self {
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Self { spi }
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}
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pub fn read(&mut self) -> Option<(i32, i32)> {
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let mut x = [0; 2];
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let mut y = [0; 2];
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self.spi
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.transaction(&mut [
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Operation::Write(&[0x90]),
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Operation::Read(&mut x),
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Operation::Write(&[0xd0]),
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Operation::Read(&mut y),
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])
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.unwrap();
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let x = (u16::from_be_bytes(x) >> 3) as i32;
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let y = (u16::from_be_bytes(y) >> 3) as i32;
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let cal = &CALIBRATION;
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let x = ((x - cal.x1) * cal.sx / (cal.x2 - cal.x1)).clamp(0, cal.sx);
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let y = ((y - cal.y1) * cal.sy / (cal.y2 - cal.y1)).clamp(0, cal.sy);
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if x == 0 && y == 0 {
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None
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} else {
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Some((x, y))
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}
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}
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}
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}
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mod my_display_interface {
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use display_interface::{DataFormat, DisplayError, WriteOnlyDataCommand};
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use embedded_hal_1::digital::OutputPin;
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use embedded_hal_1::spi::SpiDevice;
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/// SPI display interface.
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///
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/// This combines the SPI peripheral and a data/command pin
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pub struct SPIDeviceInterface<SPI, DC> {
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spi: SPI,
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dc: DC,
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}
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impl<SPI, DC> SPIDeviceInterface<SPI, DC>
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where
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SPI: SpiDevice,
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DC: OutputPin,
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{
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/// Create new SPI interface for communciation with a display driver
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pub fn new(spi: SPI, dc: DC) -> Self {
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Self { spi, dc }
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}
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}
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impl<SPI, DC> WriteOnlyDataCommand for SPIDeviceInterface<SPI, DC>
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where
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SPI: SpiDevice,
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DC: OutputPin,
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{
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fn send_commands(&mut self, cmds: DataFormat<'_>) -> Result<(), DisplayError> {
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// 1 = data, 0 = command
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self.dc.set_low().map_err(|_| DisplayError::DCError)?;
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send_u8(&mut self.spi, cmds).map_err(|_| DisplayError::BusWriteError)?;
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Ok(())
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}
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fn send_data(&mut self, buf: DataFormat<'_>) -> Result<(), DisplayError> {
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// 1 = data, 0 = command
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self.dc.set_high().map_err(|_| DisplayError::DCError)?;
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send_u8(&mut self.spi, buf).map_err(|_| DisplayError::BusWriteError)?;
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Ok(())
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}
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}
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fn send_u8<T: SpiDevice>(spi: &mut T, words: DataFormat<'_>) -> Result<(), T::Error> {
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match words {
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DataFormat::U8(slice) => spi.write(slice),
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DataFormat::U16(slice) => {
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use byte_slice_cast::*;
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spi.write(slice.as_byte_slice())
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}
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DataFormat::U16LE(slice) => {
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use byte_slice_cast::*;
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for v in slice.as_mut() {
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*v = v.to_le();
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}
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spi.write(slice.as_byte_slice())
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}
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DataFormat::U16BE(slice) => {
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use byte_slice_cast::*;
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for v in slice.as_mut() {
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*v = v.to_be();
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}
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spi.write(slice.as_byte_slice())
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}
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DataFormat::U8Iter(iter) => {
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let mut buf = [0; 32];
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let mut i = 0;
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for v in iter.into_iter() {
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buf[i] = v;
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i += 1;
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if i == buf.len() {
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spi.write(&buf)?;
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i = 0;
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}
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}
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if i > 0 {
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spi.write(&buf[..i])?;
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}
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Ok(())
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}
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DataFormat::U16LEIter(iter) => {
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use byte_slice_cast::*;
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let mut buf = [0; 32];
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let mut i = 0;
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for v in iter.map(u16::to_le) {
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buf[i] = v;
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i += 1;
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if i == buf.len() {
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spi.write(&buf.as_byte_slice())?;
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i = 0;
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}
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}
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if i > 0 {
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spi.write(&buf[..i].as_byte_slice())?;
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}
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Ok(())
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}
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DataFormat::U16BEIter(iter) => {
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use byte_slice_cast::*;
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let mut buf = [0; 64];
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let mut i = 0;
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let len = buf.len();
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for v in iter.map(u16::to_be) {
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buf[i] = v;
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i += 1;
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if i == len {
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spi.write(&buf.as_byte_slice())?;
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i = 0;
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}
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}
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if i > 0 {
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spi.write(&buf[..i].as_byte_slice())?;
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}
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Ok(())
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}
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_ => unimplemented!(),
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}
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}
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}
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