zynq-rs/libboard_zynq/src/timer/global.rs

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use libregister::{RegisterR, RegisterW};
use crate::{
clocks::Clocks,
mpcore,
time::Milliseconds,
};
pub struct GlobalTimer {
regs: &'static mut mpcore::RegisterBlock,
}
impl GlobalTimer {
pub fn new() -> GlobalTimer {
let regs = mpcore::RegisterBlock::new();
GlobalTimer { regs }
}
pub fn reset(&mut self) {
// Disable
self.regs.global_timer_control.write(
mpcore::GlobalTimerControl::zeroed()
);
// Reset counters
self.regs.global_timer_counter0.write(
mpcore::ValueRegister::zeroed()
);
self.regs.global_timer_counter1.write(
mpcore::ValueRegister::zeroed()
);
// Start
self.regs.global_timer_control.write(
mpcore::GlobalTimerControl::zeroed()
.prescaler(255)
.auto_increment_mode(true)
.timer_enable(true)
);
}
pub fn get_counter(&self) -> u64 {
loop {
let c1 = self.regs.global_timer_counter1.read().value();
let c0 = self.regs.global_timer_counter0.read().value();
let c1_post = self.regs.global_timer_counter1.read().value();
if c1 == c1_post {
return ((c1 as u64) << 32) | (c0 as u64);
}
}
}
pub fn get_time(&self) -> Milliseconds {
let prescaler = self.regs.global_timer_control.read().prescaler() as u64;
let clocks = Clocks::get();
Milliseconds(self.get_counter() * (prescaler + 1) / (clocks.cpu_3x2x() as u64 / 1000))
}
}