#![no_std]
#![no_main]
use cortex_m_rt::{entry, exception, ExceptionFrame};
use panic_halt as _;
use rand::prelude::*;
use ssd1306::{prelude::*, I2CDisplayInterface, Ssd1306};
use stm32f1xx_hal::{
i2c::{BlockingI2c, DutyCycle, Mode},
prelude::*,
stm32,
};
#[entry]
fn main() -> ! {
let dp = stm32::Peripherals::take().unwrap();
let mut flash = dp.FLASH.constrain();
let mut rcc = dp.RCC.constrain();
let clocks = rcc.cfgr.freeze(&mut flash.acr);
let mut afio = dp.AFIO.constrain(&mut rcc.apb2);
let mut gpiob = dp.GPIOB.split(&mut rcc.apb2);
let scl = gpiob.pb8.into_alternate_open_drain(&mut gpiob.crh);
let sda = gpiob.pb9.into_alternate_open_drain(&mut gpiob.crh);
let i2c = BlockingI2c::i2c1(
dp.I2C1,
(scl, sda),
&mut afio.mapr,
Mode::Fast {
frequency: 400_000.hz(),
duty_cycle: DutyCycle::Ratio2to1,
},
clocks,
&mut rcc.apb1,
1000,
10,
1000,
1000,
);
let interface = I2CDisplayInterface::new(i2c);
let mut display = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0);
display.init().unwrap();
let mut buf = [0x00u8; 1024];
let mut rng = SmallRng::seed_from_u64(0xdead_beef_cafe_d00d);
loop {
rng.fill_bytes(&mut buf);
display.draw(&buf).unwrap();
}
}
#[exception]
fn HardFault(ef: &ExceptionFrame) -> ! {
panic!("{:#?}", ef);
}