From 856ff0057316987f85fcae545ee5836334835342 Mon Sep 17 00:00:00 2001
From: Ariejan de Vroom <ariejan@ariejan.net>
Date: Sun, 17 Aug 2014 17:18:14 +0200
Subject: [PATCH] Add ACIA Reset()

---
 acia6551.go      | 50 +++++++++++++++++++++++++++++++++++++++++++-----
 acia6551_test.go | 25 ++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 5 deletions(-)

diff --git a/acia6551.go b/acia6551.go
index ffcbc80..3bdbe2f 100644
--- a/acia6551.go
+++ b/acia6551.go
@@ -1,22 +1,62 @@
 package i6502
 
+const (
+	aciaData = iota
+	aciaStatus
+	aciaCommand
+	aciaControl
+)
+
 /*
 ACIA 6551 Serial IO
 */
 type Acia6551 struct {
-	rx chan byte // Reading (Acia Input) line
-	tx chan byte // Transmitting (Acia Output) line
+	Rx chan byte // Reading (Acia Input) line
+	Tx chan byte // Transmitting (Acia Output) line
+
+	rxData      byte
+	txData      byte
+	commandData byte
+	controlData byte
+
+	rxFull  bool
+	txEmpty bool
+
+	rxIrqEnabled bool
+	txIrqEnabled bool
 }
 
 func NewAcia6551(rx chan byte, tx chan byte) (*Acia6551, error) {
-	return &Acia6551{tx: tx, rx: rx}, nil
+	acia := &Acia6551{Tx: tx, Rx: rx}
+	acia.Reset()
+
+	go func() {
+		// Handle rx data channel
+	}()
+
+	go func() {
+		// Handle tx data channel
+	}()
+
+	return acia, nil
 }
 
-func (r *Acia6551) Size() uint16 {
-	// We have a only 4 addresses, RX, TX, Command and Control
+func (a *Acia6551) Size() uint16 {
+	// We have a only 4 addresses, Data, Status, Command and Control
 	return 0x04
 }
 
+func (a *Acia6551) Reset() {
+	a.rxData = 0
+	a.rxFull = false
+
+	a.txData = 0
+	a.txEmpty = true
+
+	a.rxIrqEnabled = false
+	a.txIrqEnabled = false
+}
+
 /*
 func (r *Rom) Read(address uint16) byte {
 	return r.data[address]
diff --git a/acia6551_test.go b/acia6551_test.go
index 9e19e15..8763d79 100644
--- a/acia6551_test.go
+++ b/acia6551_test.go
@@ -5,6 +5,14 @@ import (
 	"testing"
 )
 
+func AciaSubject() *Acia6551 {
+	tx := make(chan byte)
+	rx := make(chan byte)
+	acia, _ := NewAcia6551(rx, tx)
+
+	return acia
+}
+
 func TestNewAcia6551(t *testing.T) {
 	tx := make(chan byte)
 	rx := make(chan byte)
@@ -13,3 +21,20 @@ func TestNewAcia6551(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, 0x4, acia.Size())
 }
+
+func TestAciaReset(t *testing.T) {
+	a := AciaSubject()
+	a.Reset()
+
+	assert.Equal(t, a.txData, 0)
+	assert.True(t, a.txEmpty)
+
+	assert.Equal(t, a.rxData, 0)
+	assert.False(t, a.rxFull)
+
+	assert.False(t, a.txIrqEnabled)
+	assert.False(t, a.rxIrqEnabled)
+}
+
+func TestAciaCommand(t *testing.T) {
+}