Struct rstubs::arch::pit::Timer

pub struct Timer;

Historically, PCs had a Timer component of type 8253 or 8254, modern systems come with a compatible chip. Each of these chips provides three 16-bit wide counters (“channel”), each running at a frequency of 1.19318 MHz. The timer’s counting speed is thereby independent from the CPU frequency.

Traditionally, the first counter (channel 0) was used for triggering interrupts, the second one (channel 1) controlled the memory refresh, and the third counter (channel 2) was assigned to the PC speaker.

As the PIT’s frequency is fixed to a constant value of 1.19318 MHz, the PIT can be used for calibration. For this purpose, we use channel 2 only.

Implementations

impl Timer

pub fn new(us: u16) -> Self

Initialize the timer for us micro seconds.

pub fn wait(&self) -> bool

Start the timer and actively wait for it to finish.

pub fn beep(frequency: u16)

Beep with a certain frequency.

Trait Implementations

impl Drop for Timer

fn drop(&mut self)

Executes the destructor for this type.