From 9b399811c07cc2ab881abacf6ca35107fc6bc658 Mon Sep 17 00:00:00 2001
From: Uri Shaked
Date: Mon, 25 Nov 2019 22:03:40 +0200
Subject: feat: GPIO peripheral implementation

Add new AVRIOPort class, implements GPIO output logic
---
 src/cpu.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/cpu.ts')

diff --git a/src/cpu.ts b/src/cpu.ts
index 7eff3b3..7fc3ba0 100644
--- a/src/cpu.ts
+++ b/src/cpu.ts
@@ -19,7 +19,7 @@ export interface ICPU {
   writeData(addr: u16, value: u8): void;
 }
 
-export type ICPUMemoryHook = (value: u8, oldValue: u8, addr: u16) => void;
+export type ICPUMemoryHook = (value: u8, oldValue: u8, addr: u16) => boolean | void;
 export interface ICPUMemoryHooks {
   [key: number]: ICPUMemoryHook;
 }
@@ -43,7 +43,9 @@ export class CPU implements ICPU {
   writeData(addr: number, value: number) {
     const hook = this.writeHooks[addr];
     if (hook) {
-      hook(value, this.data[addr], addr);
+      if (hook(value, this.data[addr], addr)) {
+        return;
+      }
     }
     this.data[addr] = value;
   }
-- 
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