Merge branch 'master' of pterpstra.com:pjht/altair_emu

src/main.rs

@@ -7,6 +7,7 @@ mod option_window;
 mod ram;
 mod state;
 mod window;
+mod twosio;
 
 use std::collections::HashMap;
 

src/option_window.rs

@@ -19,6 +19,7 @@ pub struct OptionWindow {
     category: OptionsCategory,
     card_options: Vec<(&'static Type, Box<dyn SettingsUi>)>,
     select_idx: Option<usize>,
+    allow_changing_cards: bool,
 }
 
 #[derive(PartialEq, Eq)]
@@ -41,15 +42,18 @@ impl OptionWindow {
             category: OptionsCategory::General,
             card_options,
             select_idx,
+            allow_changing_cards: !state.power(),
         }
     }
 
     fn sync_settings(&self, state: &mut EmuState) {
         state.update_options(self.options);
+        if self.allow_changing_cards {
             let cards = self.card_options.iter().map(|(typ, settings_ui)| (*typ, typ.new_card(ron::from_str(&settings_ui.serialize_settings()).unwrap()).unwrap())).collect();
             state.set_cards(cards);
         }
     }
+}
 
 impl Window for OptionWindow {
     fn draw(&mut self, ctx: &egui::Context, state: &mut EmuState) -> bool {
@@ -69,6 +73,7 @@ impl Window for OptionWindow {
                 }
                 OptionsCategory::Cards => {
                     TopBottomPanel::top("card_opts").show_inside(ui, |ui| {
+                        ui.set_enabled(self.allow_changing_cards);
                         SidePanel::left("card_opts_left")
                             .show_separator_line(false)
                             .show_inside(ui, |ui| {

src/state.rs

@@ -15,6 +15,7 @@ pub struct EmuState {
     options: Options,
     fp_state: FrontpanelState,
     cards: Vec<(&'static Type, Box<dyn Card>)>,
+    io_cache: Option<(u8, u8)>
 }
 
 impl EmuState {
@@ -34,6 +35,7 @@ impl EmuState {
             options,
             fp_state: FrontpanelState::default(),
             cards,
+            io_cache: None,
         };
         slf.apply_options();
         slf
@@ -125,8 +127,10 @@ impl EmuState {
             | MemCycle::Hlta => {
                 self.fp_state.set_data(0xff);
             }
-            MemCycle::In(_) => {
+            MemCycle::In(a) => {
-                self.fp_state.set_data(0);
+                let data = self.read_io(a as u8);
+                self.io_cache = Some((a as u8, data));
+                self.fp_state.set_data(data);
             }
             MemCycle::Inta(_) => todo!(),
             MemCycle::IntaHlt(_) => todo!(),
@@ -141,8 +145,22 @@ impl EmuState {
                 self.write_mem(a, d);
                 0
             }
-            MemCycle::In(_) => 0,
+            MemCycle::In(a) => {
-            MemCycle::Out(_, _) => 0,
+                if let Some((cached_addr, cached_data)) = self.io_cache {
+                    if cached_addr == a as u8 {
+                        self.io_cache = None;
+                        cached_data
+                    } else {
+                        self.read_io(a as u8)
+                    }
+                } else {
+                    self.read_io(a as u8)
+                }
+            },
+            MemCycle::Out(a, d) => {
+                self.write_io(a as u8, d);
+                0
+            },
             MemCycle::Inta(_) => todo!(),
             MemCycle::Hlta => {
                 self.running = false;
@@ -211,10 +229,22 @@ impl EmuState {
         self.cards.iter().map(|(typ, card)| (typ.name().to_string(), card.get_settings())).collect()
     }
 
+    pub fn power(&self) -> bool {
+        self.fp_state.power()
+    }
+
     fn read_mem(&mut self, address: u16) -> u8 {
         self.cards.iter_mut().find_map(|(_, card)| card.read_mem(address)).unwrap_or(0xFF)
     }
     fn write_mem(&mut self, address: u16, data: u8) {
         self.cards.iter_mut().find_map(|(_, card)| card.write_mem(address, data));
     }
+
+    fn read_io(&mut self, address: u8) -> u8 {
+        self.cards.iter_mut().find_map(|(_, card)| card.read_io(address)).unwrap_or(0xFF)
+    }
+
+    fn write_io(&mut self, address: u8, data: u8) {
+        self.cards.iter_mut().find_map(|(_, card)| card.write_io(address, data));
+    }
 }

src/twosio.rs

@@ -0,0 +1,108 @@
+use bitflags::bitflags;
+use eframe::egui::{Ui, ComboBox};
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    card::{Card, SettingsUi},
+    register,
+};
+
+bitflags! {
+    #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    struct Status: u8 {
+        const RDRF = 0b0000_0001; 
+        const TDRE = 0b0000_0010;
+        const DCD  = 0b0000_0100;
+        const CTS  = 0b0000_1000;
+        const FE   = 0b0001_0000;
+        const OVRN = 0b0010_0000;
+        const PE   = 0b0100_0000;
+        const IRQ  = 0b1000_0000;
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct TwoSioSettings {
+    start_addr: u8,
+}
+
+pub struct TwoSio {
+    start_addr: u8,
+    port1_status: Status,
+    port1_recv_data: u8,
+    port2_status: Status,
+    port2_recv_data: u8,
+}
+
+impl Card for TwoSio {
+    fn new(settings: ron::Value) -> Result<TwoSio, anyhow::Error> {
+        let settings: TwoSioSettings = settings.into_rust().unwrap();
+        Ok(Self {
+            start_addr: settings.start_addr,
+            port1_status: Status::TDRE,
+            port1_recv_data: 0,
+            port2_status: Status::TDRE,
+            port2_recv_data: 0,
+        })
+    }
+
+    fn default_settings() -> String {
+        ron::to_string(&TwoSioSettings {
+            start_addr: 0,
+        })
+        .unwrap()
+    }
+
+    fn get_settings(&self) -> String {
+        ron::to_string(&TwoSioSettings {
+            start_addr: self.start_addr,
+        }).unwrap()
+    }
+
+    fn settings_ui(settings: ron::Value) -> anyhow::Result<impl SettingsUi>
+    where
+        Self: Sized,
+    {
+        Ok(TwoSioSettingsUi {
+            settings: settings.into_rust().unwrap(),
+        })
+    }
+
+    fn read_io(&mut self, address: u8) -> Option<u8> {
+        if address & 0xF8 == self.start_addr {
+            match address & 0x2 {
+                0 => Some(self.port1_status.bits()),
+                1 => Some(self.port1_recv_data),
+                2 => Some(self.port2_status.bits()),
+                3 => Some(self.port2_recv_data),
+                _ => unreachable!(),
+            }
+        } else {
+            None
+        }
+    }
+}
+
+pub struct TwoSioSettingsUi {
+    settings: TwoSioSettings,
+}
+
+impl SettingsUi for TwoSioSettingsUi {
+    fn draw_ui(&mut self, ui: &mut Ui) {
+        ui.horizontal(|ui| {
+            ui.label("Base address");
+            ComboBox::from_id_source("2sio_base").selected_text(format!("{:#x}", self.settings.start_addr)).show_ui(ui, |ui| {
+                for i in 0..64 {
+                    let start_addr = (i as u8) * 4;
+                    ui.selectable_value(&mut self.settings.start_addr, start_addr, format!("{:#x}", start_addr));
+                }
+            });
+        });
+    }
+
+    fn serialize_settings(&self) -> String {
+        ron::to_string(&self.settings).unwrap()
+    }
+}
+
+register!(TwoSio, "88-2SIO");