Initial commit

- Display gif at 5fps
- Python conversion script

src/main.rs

@@ -0,0 +1,99 @@
+#![no_std]
+#![no_main]
+
+use cortex_m::prelude::*;
+use cortex_m_rt::entry;
+use embedded_graphics::{
+    mono_font::ascii::FONT_4X6,
+    pixelcolor::BinaryColor,
+    prelude::*,
+    text::{Baseline, Text},
+};
+use panic_halt as _;
+use rtt_target::{rprintln, rtt_init_print};
+use ssd1306::{prelude::*, I2CDisplayInterface, Ssd1306};
+use stm32f3xx_hal::{self as hal, pac, prelude::*};
+use stm32f3xx_hal::prelude::_embedded_hal_digital_InputPin;
+
+const IMAGE_LEN: usize = 220; // size of a single ascii image on screen
+const IMAGE_END: usize = 1093 * 220; // position of the last ascii char
+
+#[entry]
+fn main() -> ! {
+    rtt_init_print!();
+    let peripherals = pac::Peripherals::take().unwrap();
+    let mut core_peripherals = pac::CorePeripherals::take().unwrap();
+
+    let mut rcc = peripherals.RCC.constrain();
+    let mut flash = peripherals.FLASH.constrain();
+    let clocks = rcc.cfgr.freeze(&mut flash.acr);
+    let mut gpiob = peripherals.GPIOB.split(&mut rcc.ahb);
+    let mut gpioc = peripherals.GPIOC.split(&mut rcc.ahb);
+    let monotimer = hal::timer::MonoTimer::new(
+        core_peripherals.DWT,
+        clocks,
+        &mut core_peripherals.DCB);
+    // TODO: dont use hardcoded val here
+    let mut delay = cortex_m::delay::Delay::new(core_peripherals.SYST, 8000000);
+
+    let mut button1 = gpioc
+        .pc13
+        .into_pull_down_input(&mut gpioc.moder, &mut gpioc.pupdr);
+
+    let scl = gpiob
+        .pb8
+        .into_af_open_drain(&mut gpiob.moder, &mut gpiob.otyper, &mut gpiob.afrh);
+    let sda = gpiob
+        .pb9
+        .into_af_open_drain(&mut gpiob.moder, &mut gpiob.otyper, &mut gpiob.afrh);
+
+    let i2c = hal::i2c::I2c::new(
+        peripherals.I2C1,
+        (scl, sda),
+        1000.kHz().try_into().unwrap(),
+        clocks,
+        &mut rcc.apb1,
+    );
+
+    let interface = I2CDisplayInterface::new(i2c);
+    let mut display = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0)
+        .into_buffered_graphics_mode();
+    display.init().unwrap();
+
+    let text_style = embedded_graphics::mono_font::MonoTextStyleBuilder::new()
+        .font(&FONT_4X6)
+        .text_color(BinaryColor::On)
+        .build();
+
+    let bad_apple = core::str::from_utf8(include_bytes!("../assets/gen.txt")).unwrap();
+
+    // start indexing at 0, draw IMAGE_LEN ascii chars to display
+    let mut index: usize = 0;
+    loop {
+        let instant = monotimer.now();
+        display.clear();
+
+        rprintln!("draw: {} to {}", index, index + IMAGE_LEN);
+        let text = Text::with_baseline(
+            &bad_apple[index..index + IMAGE_LEN],
+            Point::new(0, 0),
+            text_style,
+            Baseline::Top,
+        );
+        text.draw(&mut display).unwrap();
+        display.flush().unwrap();
+
+        // go to next frame or reset to start
+        index = (index + IMAGE_LEN) % IMAGE_END;
+
+        let elapsed = instant.elapsed();
+        rprintln!("draw took: {}", elapsed);
+        rprintln!("freq: {}", monotimer.frequency());
+        delay.delay_ms(100);
+
+        // kill switch
+        if button1.is_high().unwrap() {
+            loop {}
+        }
+    }
+}