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#![no_std]
#![no_main]
#![allow(incomplete_features)]
#![feature(trait_alias)]
#![feature(type_alias_impl_trait)]
#[path = "../example_common.rs"]
mod example_common;
use embassy_stm32::dac::{Channel, Dac, Value};
use embassy_stm32::gpio::NoPin;
use embassy_stm32::pac;
use example_common::*;
#[cortex_m_rt::entry]
fn main() -> ! {
info!("Hello World!");
unsafe {
pac::RCC.apb1enr1().modify(|w| {
w.set_dac1en(true);
});
}
let p = embassy_stm32::init(Default::default());
let mut dac = Dac::new(p.DAC1, p.PA4, NoPin);
loop {
for v in 0..=255 {
unwrap!(dac.set(Channel::Ch1, Value::Bit8(to_sine_wave(v))));
unwrap!(dac.trigger(Channel::Ch1));
}
}
}
use micromath::F32Ext;
fn to_sine_wave(v: u8) -> u8 {
if v >= 128 {
// top half
let r = 3.14 * ((v - 128) as f32 / 128.0);
(r.sin() * 128.0 + 127.0) as u8
} else {
// bottom half
let r = 3.14 + 3.14 * (v as f32 / 128.0);
(r.sin() * 128.0 + 127.0) as u8
}
}
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