feat: GPIO peripheral implementation

Add new AVRIOPort class, implements GPIO output logic

2 files changed, 20 insertions, 8 deletions

diff --git a/demo/src/execute.ts b/demo/src/execute.ts
index 96a0411..4568839 100644
--- a/demo/src/execute.ts
+++ b/demo/src/execute.ts
@@ -1,4 +1,13 @@
-import { avrInstruction, AVRTimer, CPU, timer0Config } from 'avr8js';
+import {
+  avrInstruction,
+  AVRTimer,
+  CPU,
+  timer0Config,
+  AVRIOPort,
+  portBConfig,
+  portCConfig,
+  portDConfig
+} from 'avr8js';
 import { loadHex } from './intelhex';
 
 // ATmega328p params
@@ -8,6 +17,9 @@ export class AVRRunner {
   readonly program = new Uint16Array(FLASH);
   readonly cpu: CPU;
   readonly timer: AVRTimer;
+  readonly portB: AVRIOPort;
+  readonly portC: AVRIOPort;
+  readonly portD: AVRIOPort;
 
   private stopped = false;
 
@@ -15,6 +27,9 @@ export class AVRRunner {
     loadHex(hex, new Uint8Array(this.program.buffer));
     this.cpu = new CPU(this.program);
     this.timer = new AVRTimer(this.cpu, timer0Config);
+    this.portB = new AVRIOPort(this.cpu, portBConfig);
+    this.portC = new AVRIOPort(this.cpu, portCConfig);
+    this.portD = new AVRIOPort(this.cpu, portDConfig);
   }
 
   async execute(callback: (cpu: CPU) => void) {
diff --git a/demo/src/index.ts b/demo/src/index.ts
index 22e8143..e51cbbc 100644
--- a/demo/src/index.ts
+++ b/demo/src/index.ts
@@ -1,7 +1,7 @@
 import { buildHex } from './compile';
-import './index.css';
 import { AVRRunner } from './execute';
 import { formatTime } from './format-time';
+import './index.css';
 import { LED } from './led';
 
 let editor: any;
@@ -55,16 +55,13 @@ function executeProgram(hex: string) {
   runner = new AVRRunner(hex);
   const MHZ = 16000000;
 
-  // Hook to PORTB output
-  runner.cpu.writeHooks[0x25] = (value: number) => {
-    const DDRB = runner.cpu.data[0x24];
-    value &= DDRB;
+  // Hook to PORTB register
+  runner.portB.addListener((value) => {
     const D12bit = 1 << 4;
     const D13bit = 1 << 5;
     led12.value = value & D12bit ? true : false;
     led13.value = value & D13bit ? true : false;
-  };
-
+  });
   runner.execute((cpu) => {
     const time = formatTime(cpu.cycles / MHZ);
     statusLabel.textContent = 'Simulation time: ' + time;