rust_hdl_widgets/
pwm.rs

1use rust_hdl_core::prelude::*;
2
3use crate::dff::DFF;
4
5#[derive(LogicBlock)]
6pub struct PulseWidthModulator<const N: usize> {
7    pub enable: Signal<In, Bit>,
8    pub threshold: Signal<In, Bits<N>>,
9    pub clock: Signal<In, Clock>,
10    pub active: Signal<Out, Bit>,
11    counter: DFF<Bits<N>>,
12}
13
14impl<const N: usize> Default for PulseWidthModulator<N> {
15    fn default() -> Self {
16        Self {
17            enable: Signal::default(),
18            threshold: Signal::default(),
19            clock: Signal::default(),
20            active: Signal::new_with_default(false),
21            counter: Default::default(),
22        }
23    }
24}
25
26impl<const N: usize> Logic for PulseWidthModulator<N> {
27    #[hdl_gen]
28    fn update(&mut self) {
29        clock!(self, clock, counter);
30        self.counter.d.next = self.counter.q.val() + 1;
31        self.active.next = self.enable.val() & (self.counter.q.val() < self.threshold.val());
32    }
33}
rust_hdl_widgets/pwm.rs

rust_hdl_widgets/
pwm.rs
