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