Initial Commit

src/emu.zig

@@ -0,0 +1,19 @@
+const _ = @import("std");
+
+const Scheduler = @import("scheduler.zig").Scheduler;
+const ARM7TDMI = @import("cpu.zig").ARM7TDMI;
+const Bus = @import("bus.zig").Bus;
+
+const CYCLES_PER_FRAME: u64 = 10_000; // TODO: What is this?
+
+pub fn runFrame(sch: *Scheduler, cpu: *ARM7TDMI, bus: *Bus) void {
+    const frame_end = sch.tick + CYCLES_PER_FRAME;
+
+    while (sch.tick < frame_end) {
+        while (sch.tick < sch.nextTimestamp()) {
+            sch.tick += cpu.step();
+        }
+
+        sch.handleEvent(cpu, bus);
+    }
+}