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mrustc (master)
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#![warn(clippy::all, clippy::nursery, clippy::pedantic, rust_2018_idioms)] // Safety-critical application lints #![deny( clippy::pedantic, clippy::float_cmp_const, clippy::indexing_slicing, clippy::integer_arithmetic, clippy::unwrap_used )] #![allow( clippy::implicit_return, clippy::iter_nth_zero, clippy::match_bool, clippy::missing_errors_doc, clippy::module_name_repetitions, clippy::wildcard_imports )] // To use the `unsafe` keyword, do not remove the `unsafe_code` attribute entirely. // Instead, change it to `#![allow(unsafe_code)]` or preferably `#![deny(unsafe_code)]` + opt-in // with local `#[allow(unsafe_code)]`'s on a case-by-case basis, if practical. #![allow(unsafe_code)] #![forbid(bare_trait_objects)] // Uncomment before ship to reconcile use of possibly redundant crates, debug remnants, missing // license files and more // #![allow(clippy::blanket_clippy_restriction_lints)] // #![warn(clippy::cargo, clippy::restriction, missing_docs, warnings)] // #![allow(clippy::implicit_return)] use std::ptr::{read_volatile, write_volatile}; #[repr(u8)] enum Color { Black = 0x0, White, Red, Cyan, Purple, Green, Blue, Yellow, Orange, Brown, LightRed, DarkGrey, MediumGrey, LightGreen, LightBlue, LightGrey, } enum VicII { BorderColor = 0xd020, BackgroundColor = 0xd021, } enum Cia1 { PortA = 0xdc00, PortB = 0xdc01, } #[repr(u8)] enum JoyMask { Up = 0b0_0001, Down = 0b0_0010, Left = 0b0_0100, Right = 0b0_1000, Fire = 0b1_0000, } struct Joystick { base_addr: u16, } impl Joystick { pub fn new(base_addr: Cia1) -> Self { Self { base_addr: base_addr as u16 } } pub fn state(&self) -> JoyState { JoyState(unsafe {read_volatile(self.base_addr as *const u8) }) } } struct JoyState(u8); impl JoyState { pub fn is_up(&self) -> bool { self.0 & (JoyMask::Up as u8) == 0 } pub fn is_down(&self) -> bool { self.0 & (JoyMask::Down as u8) == 0 } pub fn is_left(&self) -> bool { self.0 & (JoyMask::Left as u8) == 0 } pub fn is_right(&self) -> bool { self.0 & (JoyMask::Right as u8) == 0 } pub fn is_fire(&self) -> bool { self.0 & (JoyMask::Fire as u8) == 0 } } fn set_border_color(color: Color) { unsafe { write_volatile((VicII::BorderColor as u16) as *mut Color, color) }; } pub fn main() { use Color::*; let joy_1 = Joystick::new(Cia1::PortB); loop { let joy_1_state = joy_1.state(); match joy_1_state.is_fire() { true => set_border_color(White), false => set_border_color(Black), } } }
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