image_i2c.rs

//! Draw a 1 bit per pixel black and white image. On a 128x64 SSD1306 display over I2C.
//!
//! Image was created with ImageMagick:
//!
//! ```bash
//! convert rust.png -depth 1 gray:rust.raw
//! ```
//!
//! This example is for the STM32F103 "Blue Pill" board using I2C1.
//!
//! Wiring connections are as follows for a CRIUS-branded display:
//!
//! ```
//!      Display -> Blue Pill
//! (black)  GND -> GND
//! (red)    +5V -> VCC
//! (yellow) SDA -> PB7
//! (green)  SCL -> PB6
//! ```
//!
//! Run on a Blue Pill with `cargo run --example image_i2c`.

#![no_std]
#![no_main]

use cortex_m::asm::nop;
use cortex_m_rt::entry;
use defmt_rtt as _;
#[cfg(feature = "async")]
use embassy_stm32::{bind_interrupts, i2c, peripherals};

use embassy_stm32::time::Hertz;
use embedded_graphics::{
    image::{Image, ImageRaw},
    pixelcolor::BinaryColor,
    prelude::*,
};
use panic_probe as _;
use ssd1306::{prelude::*, I2CDisplayInterface, Ssd1306};

#[entry]
fn main() -> ! {
    let p = embassy_stm32::init(Default::default());
    #[cfg(feature = "async")]
    bind_interrupts!(struct Irqs {
        I2C1_EV => i2c::EventInterruptHandler<peripherals::I2C1>;
        I2C1_ER => i2c::ErrorInterruptHandler<peripherals::I2C1>;
    });

    #[cfg(feature = "async")]
    let i2c = embassy_stm32::i2c::I2c::new(
        p.I2C1,
        p.PB6,
        p.PB7,
        Irqs,
        p.DMA1_CH6,
        p.DMA1_CH7,
        Hertz::khz(400),
        Default::default(),
    );

    #[cfg(not(feature = "async"))]
    let i2c = embassy_stm32::i2c::I2c::new_blocking(
        p.I2C1,
        p.PB6,
        p.PB7,
        Hertz::khz(400),
        Default::default(),
    );

    let interface = I2CDisplayInterface::new(i2c);
    let mut display = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0)
        .into_buffered_graphics_mode();
    display.init().unwrap();

    let raw: ImageRaw<BinaryColor> = ImageRaw::new(include_bytes!("./rust.raw"), 64);

    let im = Image::new(&raw, Point::new(32, 0));

    im.draw(&mut display).unwrap();

    display.flush().unwrap();

    loop {
        nop()
    }
}