51 lines
1.1 KiB
Rust
51 lines
1.1 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt_rtt as _; // global logger
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use panic_probe as _;
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use cortex_m_rt::entry;
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use defmt::*;
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use embassy_stm32::dac::{Channel, Dac, Value};
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use embassy_stm32::time::U32Ext;
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use embassy_stm32::Config;
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pub fn config() -> Config {
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let mut config = Config::default();
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config.rcc.sys_ck = Some(400.mhz().into());
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config.rcc.hclk = Some(200.mhz().into());
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config.rcc.pll1.q_ck = Some(100.mhz().into());
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config
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}
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#[entry]
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fn main() -> ! {
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info!("Hello World, dude!");
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let p = embassy_stm32::init(config());
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let mut dac = Dac::new_1ch(p.DAC1, p.PA4);
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loop {
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for v in 0..=255 {
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unwrap!(dac.set(Channel::Ch1, Value::Bit8(to_sine_wave(v))));
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unwrap!(dac.trigger(Channel::Ch1));
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}
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}
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}
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use micromath::F32Ext;
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fn to_sine_wave(v: u8) -> u8 {
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if v >= 128 {
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// top half
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let r = 3.14 * ((v - 128) as f32 / 128.0);
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(r.sin() * 128.0 + 127.0) as u8
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} else {
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// bottom half
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let r = 3.14 + 3.14 * (v as f32 / 128.0);
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(r.sin() * 128.0 + 127.0) as u8
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}
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}
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