3 files changed, 18 insertions, 33 deletions
diff --git a/src/cpu/cpu.ts b/src/cpu/cpu.ts
index 7a518b8..2675d1d 100644
--- a/src/cpu/cpu.ts
+++ b/src/cpu/cpu.ts
@@ -11,33 +11,6 @@ import { avrInterrupt } from './interrupt';
 
 const registerSpace = 0x100;
 
-// eslint-disable-next-line @typescript-eslint/interface-name-prefix
-export interface ICPU {
-  readonly data: Uint8Array;
-  readonly dataView: DataView;
-  readonly progMem: Uint16Array;
-  readonly progBytes: Uint8Array;
-
-  /**
-   * Whether the program counter (PC) can address 22 bits (the default is 16)
-   */
-  readonly pc22Bits: boolean;
-
-  /**
-   * Program counter
-   */
-  pc: u32;
-
-  /**
-   * Clock cycle counter
-   */
-  cycles: number;
-
-  readData(addr: u16): u8;
-  writeData(addr: u16, value: u8, mask?: u8): void;
-  onWatchdogReset(): void;
-}
-
 export type CPUMemoryHook = (value: u8, oldValue: u8, addr: u16, mask: u8) => boolean | void;
 export interface CPUMemoryHooks {
   [key: number]: CPUMemoryHook;
@@ -66,7 +39,7 @@ interface AVRClockEventEntry {
   next: AVRClockEventEntry | null;
 }
 
-export class CPU implements ICPU {
+export class CPU {
   readonly data: Uint8Array = new Uint8Array(this.sramBytes + registerSpace);
   readonly data16 = new Uint16Array(this.data.buffer);
   readonly dataView = new DataView(this.data.buffer);
@@ -76,6 +49,10 @@ export class CPU implements ICPU {
   private readonly pendingInterrupts: AVRInterruptConfig[] = [];
   private nextClockEvent: AVRClockEventEntry | null = null;
   private readonly clockEventPool: AVRClockEventEntry[] = []; // helps avoid garbage collection
+
+  /**
+   * Whether the program counter (PC) can address 22 bits (the default is 16)
+   */
   readonly pc22Bits = this.progBytes.length > 0x20000;
 
   readonly gpioPorts = new Set<AVRIOPort>();
@@ -89,8 +66,16 @@ export class CPU implements ICPU {
     /* empty by default */
   };
 
+  /**
+   * Program counter
+   */
   pc: u32 = 0;
-  cycles: u32 = 0;
+
+  /**
+   * Clock cycle counter
+   */
+  cycles = 0;
+
   nextInterrupt: i16 = -1;
 
   constructor(public progMem: Uint16Array, private sramBytes = 8192) {
diff --git a/src/cpu/instruction.ts b/src/cpu/instruction.ts
index 9937ec9..e2bed5d 100644
--- a/src/cpu/instruction.ts
+++ b/src/cpu/instruction.ts
@@ -10,7 +10,7 @@
  * Copyright (C) 2019, 2020 Uri Shaked
  */
 
-import { ICPU } from './cpu';
+import { CPU } from './cpu';
 import { u16 } from '../types';
 
 function isTwoWordInstruction(opcode: u16) {
@@ -26,7 +26,7 @@ function isTwoWordInstruction(opcode: u16) {
   );
 }
 
-export function avrInstruction(cpu: ICPU) {
+export function avrInstruction(cpu: CPU) {
   const opcode = cpu.progMem[cpu.pc];
 
   if ((opcode & 0xfc00) === 0x1c00) {
diff --git a/src/cpu/interrupt.ts b/src/cpu/interrupt.ts
index 1bfa035..2e4ceb9 100644
--- a/src/cpu/interrupt.ts
+++ b/src/cpu/interrupt.ts
@@ -6,9 +6,9 @@
  * Copyright (C) 2019, Uri Shaked
  */
 
-import { ICPU } from './cpu';
+import { CPU } from './cpu';
 
-export function avrInterrupt(cpu: ICPU, addr: number) {
+export function avrInterrupt(cpu: CPU, addr: number) {
   const sp = cpu.dataView.getUint16(93, true);
   cpu.data[sp] = cpu.pc & 0xff;
   cpu.data[sp - 1] = (cpu.pc >> 8) & 0xff;