81 lines
1.4 KiB
Rust
81 lines
1.4 KiB
Rust
use bitfield::bitfield;
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use crate::instruction::Cycles;
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#[derive(Debug, Clone, Copy)]
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pub struct Timer {
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pub control: TimerControl,
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}
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impl Timer {
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pub fn step(&mut self, _cycles: Cycles) {
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//
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}
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}
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impl Default for Timer {
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fn default() -> Self {
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Self {
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control: 0x00.into(),
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}
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}
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}
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#[derive(Debug, Clone, Copy)]
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enum TimerSpeed {
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Freq4096Hz = 0,
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Freq262144Hz = 1,
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Freq65536Hz = 2,
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Freq16384Hz = 3,
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}
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impl From<u8> for TimerSpeed {
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fn from(byte: u8) -> Self {
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match byte {
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0x00 => Self::Freq4096Hz,
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0x01 => Self::Freq262144Hz,
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0x10 => Self::Freq65536Hz,
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0x11 => Self::Freq16384Hz,
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_ => unreachable!("{:04X} is not a valid representation of TimerSpeed", byte),
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}
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}
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}
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impl From<TimerSpeed> for u8 {
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fn from(speed: TimerSpeed) -> Self {
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speed as u8
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}
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}
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bitfield! {
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pub struct TimerControl(u8);
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impl Debug;
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enabled, set_enabled: 2;
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from into TimerSpeed, speed, set_speed: 1, 0;
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}
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impl Copy for TimerControl {}
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impl Clone for TimerControl {
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fn clone(&self) -> Self {
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*self
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}
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}
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impl Default for TimerControl {
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fn default() -> Self {
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Self(0)
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}
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}
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impl From<u8> for TimerControl {
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fn from(byte: u8) -> Self {
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Self(byte)
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}
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}
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impl From<TimerControl> for u8 {
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fn from(ctrl: TimerControl) -> Self {
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ctrl.0
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}
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}
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