more refactor

Cargo.lock

@@ -964,6 +964,7 @@ dependencies = [
  "mipidsi",
  "smart-leds",
  "smart-leds-trait",
+ "static_cell",
 ]
 
 [[package]]

Cargo.toml

@@ -18,6 +18,7 @@ esp-rtos = { version = "0.4", features = ["embassy", "esp32c6"] }
 mipidsi = "0.10"
 smart-leds = "0.4"
 smart-leds-trait = "0.3"
+static_cell = { version = "2.1.1" }
 
 [profile.dev]
 codegen-units = 1

src/backlight.rs

@@ -5,6 +5,7 @@ use esp_hal::ledc::timer::{self, Timer, TimerIFace};
 use esp_hal::ledc::{LSGlobalClkSource, Ledc, LowSpeed};
 use esp_hal::peripherals::LEDC;
 use esp_hal::time::Rate;
+use static_cell::StaticCell;
 
 /// PWM frequency for the backlight (Hz).
 const BACKLIGHT_FREQ: Rate = Rate::from_khz(5);
@@ -13,11 +14,13 @@ const BACKLIGHT_FREQ: Rate = Rate::from_khz(5);
 /// running the display above 50% brightness, so `level = 1.0` maps to this.
 const MAX_DUTY_PCT: u8 = 50;
 
+static BACKLIGHT_TIMER: StaticCell<(Ledc, Timer<'static, LowSpeed>)> = StaticCell::new();
+
 /// Create and configure the LEDC timer used by the backlight.
 ///
-/// Returns the `Ledc` and `Timer` so the caller can build a [`LcdBacklight`]
+/// Returns the `Ledc` and `Timer` so the caller can build a [`Backlight`]
 /// that borrows the timer.
-pub fn setup_timer(
+fn setup_timer(
     ledc: LEDC<'static>,
 ) -> Result<(Ledc<'static>, Timer<'static, LowSpeed>), timer::Error> {
     let mut ledc = Ledc::new(ledc);
@@ -37,15 +40,17 @@ pub type Error = channel::Error;
 
 /// Backlight PWM driver. The channel holds a reference to the caller-owned
 /// timer, so this type's lifetime is bounded by the timer's lifetime.
-pub struct LcdBacklight<'a> {
+pub struct Backlight<'a> {
     channel: Channel<'a, LowSpeed>,
 }
 
-impl<'a> LcdBacklight<'a> {
+impl<'a> Backlight<'a> {
     pub fn new(
-        timer: &'a dyn TimerIFace<LowSpeed>,
+        ledc: LEDC<'static>,
         pin: impl PeripheralOutput<'a>,
     ) -> Result<Self, Error> {
+        let (_ledc, timer) = BACKLIGHT_TIMER.init(setup_timer(ledc)
+            .expect("Failed to init backlight timer"));
         let mut channel = Channel::new(channel::Number::Channel0, pin);
         channel.configure(channel::config::Config {
             timer,

src/display.rs

@@ -9,6 +9,7 @@ use mipidsi::interface::SpiInterface;
 use mipidsi::models::ST7789;
 use mipidsi::options::{ColorInversion, ColorOrder, Orientation, Rotation};
 use mipidsi::Builder;
+use crate::framebuffer::Framebuffer;
 
 pub const WIDTH: u32 = 172;
 pub const HEIGHT: u32 = 320;
@@ -72,13 +73,14 @@ pub struct LcdPins {
 }
 
 /// The raw LCD resources, ready to drive the async framebuffer path.
-pub struct LcdParts {
+pub struct Display {
     pub spi: SpiDmaBus,
     pub cs: Output<'static>,
     pub dc: Output<'static>,
 }
 
-pub fn init_parts(pins: LcdPins) -> LcdParts {
+impl Display {
+    pub fn new(pins: LcdPins) -> Self {
         let mut buffer = [0u8; 4096];
         let dma_tx_buf = esp_hal::dma_tx_buffer!(DMA_BUF_SIZE).expect("Failed to create DMA TX buffer");
         let dma_rx_buf = esp_hal::dma_rx_buffer!(4).expect("Failed to create DMA RX buffer");
@@ -122,43 +124,42 @@ pub fn init_parts(pins: LcdPins) -> LcdParts {
         let (device, dc) = interface.release();
         let (spi, cs) = device.into_inner();
 
-    LcdParts { spi, cs, dc }
+        Display { spi, cs, dc }
-}
+    }
 
-/// Stream a full framebuffer to the panel asynchronously (DMA).
+    /// Stream a full framebuffer to the panel asynchronously (DMA).
-///
+    ///
-/// Sends the address window and RAMWR command, then the pixel bytes as one
+    /// Sends the address window and RAMWR command, then the pixel bytes as one
-/// (internally chunked) DMA transfer. Returns when the transfer completes.
+    /// (internally chunked) DMA transfer. Returns when the transfer completes.
-pub async fn send_framebuffer(
+    pub async fn send_framebuffer(
-    spi: &mut SpiDmaBus,
+        &mut self,
-    dc: &mut Output<'static>,
+        framebuffer: &Framebuffer,
-    cs: &mut Output<'static>,
+    ) -> Result<(), SpiError> {
-    bytes: &[u8],
-) -> Result<(), SpiError> {
         let x0 = COLUMN_OFFSET;
         let x1 = COLUMN_OFFSET + WIDTH as u16 - 1;
         let y1 = HEIGHT as u16 - 1;
 
-    cs.set_low();
+        self.cs.set_low();
 
         // MIPI DCS: DC low for the command byte, high for its arguments.
-    dc.set_low();
+        self.dc.set_low();
-    spi.write_async(&[0x2A]).await?;
+        self.spi.write_async(&[0x2A]).await?;
-    dc.set_high();
+        self.dc.set_high();
-    spi.write_async(&[(x0 >> 8) as u8, x0 as u8, (x1 >> 8) as u8, x1 as u8])
+        self.spi.write_async(&[(x0 >> 8) as u8, x0 as u8, (x1 >> 8) as u8, x1 as u8])
             .await?;
 
-    dc.set_low();
+        self.dc.set_low();
-    spi.write_async(&[0x2B]).await?;
+        self.spi.write_async(&[0x2B]).await?;
-    dc.set_high();
+        self.dc.set_high();
-    spi.write_async(&[0, 0, (y1 >> 8) as u8, y1 as u8]).await?;
+        self.spi.write_async(&[0, 0, (y1 >> 8) as u8, y1 as u8]).await?;
 
-    dc.set_low();
+        self.dc.set_low();
-    spi.write_async(&[0x2C]).await?;
+        self.spi.write_async(&[0x2C]).await?;
-    dc.set_high();
+        self.dc.set_high();
 
-    spi.write_async(bytes).await?;
+        self.spi.write_async(framebuffer.as_bytes()).await?;
-    cs.set_high();
+        self.cs.set_high();
 
         Ok(())
+    }
 }

src/led.rs

@@ -1,9 +1,10 @@
 use esp_hal::gpio::interconnect::PeripheralOutput;
-use esp_hal::rmt::TxChannelCreator;
+use esp_hal::peripherals::RMT;
+use esp_hal::rmt::Rmt;
 use esp_hal::time::Rate;
 use esp_hal::Blocking;
-use esp_hal_smartled::{RmtSmartLeds, WS2812_TIMING, buffer_size, color_order};
+use esp_hal_smartled::{buffer_size, color_order, RmtSmartLeds, WS2812_TIMING};
-use smart_leds_trait::{RGB8, SmartLedsWrite};
+use smart_leds_trait::{SmartLedsWrite, RGB8};
 
 const RMT_FREQ: Rate = Rate::from_mhz(80);
 
@@ -15,11 +16,13 @@ pub struct RgbLed {
 
 impl RgbLed {
     pub fn new(
-        channel: impl TxChannelCreator<'static, Blocking>,
+        rmt_periph: RMT<'static>,
         pin: impl PeripheralOutput<'static>,
     ) -> Result<Self, esp_hal_smartled::Error> {
+        let rmt = Rmt::new(rmt_periph, Rate::from_mhz(80))
+            .expect("Failed to init RMT");
         Ok(Self {
-            led: SmartLed::new_with_memsize(WS2812_TIMING, channel, pin, 2, RMT_FREQ)?,
+            led: SmartLed::new_with_memsize(WS2812_TIMING, rmt.channel0, pin, 2, RMT_FREQ)?,
         })
     }
 

src/main.rs

@@ -14,9 +14,11 @@ use embassy_time::{Instant, Timer};
 use esp_backtrace as _;
 use esp_bootloader_esp_idf::esp_app_desc;
 use esp_hal::timer::timg::TimerGroup;
-use esp_hal::{init, rmt::Rmt, time::Rate, Config};
+use esp_hal::{init, Config};
+use esp_hal::peripherals::{GPIO22, LEDC};
 use esp_println::println;
 use smart_leds::hsv::{hsv2rgb, Hsv};
+use crate::display::Display;
 
 const SAT: u8 = 255;
 const VAL: u8 = 255;
@@ -24,7 +26,12 @@ const VAL: u8 = 255;
 esp_app_desc!();
 
 #[embassy_executor::task]
-async fn led_task(mut led: led::RgbLed) {
+async fn led_task(
+    rmt_periph: esp_hal::peripherals::RMT<'static>,
+    led_pin: esp_hal::peripherals::GPIO8<'static>,
+) {
+    let mut led = led::RgbLed::new(rmt_periph, led_pin).expect("Failed to init RGB LED");
+
     let mut frame = 0u32;
     loop {
         let hue = (frame % 256) as u8;
@@ -42,18 +49,19 @@ async fn led_task(mut led: led::RgbLed) {
 #[embassy_executor::task]
 async fn display_task(
     pins: display::LcdPins,
-    mut fb: framebuffer::Framebuffer,
+    ledc: LEDC<'static>,
-    timer: esp_hal::ledc::timer::Timer<'static, esp_hal::ledc::LowSpeed>,
+    bl_pin: GPIO22<'static>,
-    bl_pin: esp_hal::peripherals::GPIO22<'static>,
 ) {
-    let mut parts = display::init_parts(pins);
+    let mut display = Display::new(pins);
     println!("LCD {}x{} initialized", display::WIDTH, display::HEIGHT);
 
-    let mut backlight =
+    let mut backlight = backlight::Backlight::new(ledc, bl_pin)
-        backlight::LcdBacklight::new(&timer, bl_pin).expect("Failed to init backlight");
+        .expect("Failed to init backlight");
     backlight.set_level(0.5).unwrap();
     println!("backlight set to 0.5");
 
+    let mut fb = framebuffer::Framebuffer;
+
     let mut pts = [
         Point::new(86, 20),
         Point::new(61, 50),
@@ -64,6 +72,10 @@ async fn display_task(
     let mut frame = 0u32;
     let mut fps_window_start = Instant::now();
     let mut fps_frames = 0u32;
+    let mut window_draw_us: u64 = 0;
+    let mut window_send_us: u64 = 0;
+    let mut last_draw_us: u64;
+    let mut last_send_us: u64;
 
     loop {
         let hue = (frame % 256) as u8;
@@ -91,30 +103,40 @@ async fn display_task(
             vy = -vy;
         }
 
+        let draw_start = Instant::now();
         fb.clear();
         Triangle::new(pts[0], pts[1], pts[2])
             .into_styled(PrimitiveStyle::with_fill(accent))
             .draw(&mut fb)
             .unwrap();
+        last_draw_us = draw_start.elapsed().as_micros() as u64;
 
-        display::send_framebuffer(&mut parts.spi, &mut parts.dc, &mut parts.cs, fb.as_bytes())
+        let send_start = Instant::now();
-            .await
+        display.send_framebuffer(&fb).await.unwrap();
-            .unwrap();
+        last_send_us = send_start.elapsed().as_micros() as u64;
 
         if frame % 32 == 0 {
             println!(
-                "frame {frame}: apex=({}, {}), v=({}, {}), hue={hue}",
+                "frame {frame}: apex=({}, {}), v=({}, {}), hue={hue} | draw {last_draw_us} us, send {last_send_us} us",
                 pts[0].x, pts[0].y, vx, vy
             );
         }
 
         fps_frames += 1;
+        window_draw_us += last_draw_us;
+        window_send_us += last_send_us;
         if fps_frames >= 60 {
             let elapsed_ms = fps_window_start.elapsed().as_millis().max(1);
             let fps = (fps_frames as u64 * 1000) / elapsed_ms;
-            println!("fps: {fps} ({fps_frames} frames in {elapsed_ms} ms)");
+            let avg_draw_us = window_draw_us / fps_frames as u64;
+            let avg_send_us = window_send_us / fps_frames as u64;
+            println!(
+                "fps: {fps} ({fps_frames} frames in {elapsed_ms} ms) | avg draw {avg_draw_us} us, avg send {avg_send_us} us"
+            );
             fps_frames = 0;
             fps_window_start = Instant::now();
+            window_draw_us = 0;
+            window_send_us = 0;
         }
 
         frame = frame.wrapping_add(1);
@@ -127,15 +149,7 @@ async fn main(spawner: Spawner) -> ! {
     let timg0 = TimerGroup::new(peripherals.TIMG0);
     esp_rtos::start(timg0.timer0, peripherals.FROM_CPU_INTR0);
 
-    let led = {
+    spawner.spawn(led_task(peripherals.RMT, peripherals.GPIO8).unwrap());
-        let rmt = Rmt::new(peripherals.RMT, Rate::from_mhz(80)).expect("Failed to init RMT");
-        led::RgbLed::new(rmt.channel0, peripherals.GPIO8).expect("Failed to init RGB LED")
-    };
-
-    let (_ledc, timer) =
-        backlight::setup_timer(peripherals.LEDC).expect("Failed to init backlight timer");
-
-    spawner.spawn(led_task(led).unwrap());
     spawner.spawn(display_task(
         display::LcdPins {
             spi2: peripherals.SPI2,
@@ -146,8 +160,7 @@ async fn main(spawner: Spawner) -> ! {
             rst: peripherals.GPIO21,
             dma_ch: peripherals.DMA_CH0,
         },
-        framebuffer::Framebuffer,
+        peripherals.LEDC,
-        timer,
         peripherals.GPIO22,
     ).unwrap());