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tweak period calculation in song pwm code

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This commit is contained in:
Edward Shen 2025-05-17 00:09:10 -07:00
parent ca5867ba36
commit 5b6e35189a
Signed by: edward
GPG key ID: 19182661E818369F
1 changed files with 6 additions and 15 deletions
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21
src/main.rs
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@ -99,19 +99,6 @@ async fn heartbeat(mut control: Control<'static>) {
#[embassy_executor::main]
async fn main(spawner: Spawner) {
// let p = embassy_rp::init(Default::default());
// let mut led = Output::new(p.PIN_18, Level::Low);
// loop {
// info!("led on!");
// led.set_high();
// Timer::after_secs(1).await;
// info!("led off!");
// led.set_low();
// Timer::after_secs(1).await;
// }
let mut p = embassy_rp::init(embassy_rp::config::Config::default());
let fw = include_bytes!("../embassy/cyw43-firmware/43439A0.bin");
let clm = include_bytes!("../embassy/cyw43-firmware/43439A0_clm.bin");
@ -214,7 +201,7 @@ async fn play_music(slice: &mut PWM_SLICE2, pin: &mut PIN_20) {
F4 = 349,
G4 = 392,
A5 = 440,
#[allow(dead_code)]
#[expect(dead_code)]
B5 = 494,
C5 = 524,
}
@ -282,7 +269,11 @@ async fn play_music(slice: &mut PWM_SLICE2, pin: &mut PIN_20) {
let clock_freq_hz = embassy_rp::clocks::clk_sys_freq();
let divider = 16;
#[expect(clippy::cast_possible_truncation)]
let period = clock_freq_hz.saturating_div(note as u32 * u32::from(divider)) as u16 - 1;
let period = clock_freq_hz
.checked_div(note as u32 * u32::from(divider))
.unwrap_or_default()
.checked_sub(1)
.unwrap_or(1) as u16;
let mut c = pwm::Config::default();
c.top = period;