Apple2-IO-RPi/RaspberryPi/apple2driver/driver.go

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// Copyright Terence J. Boldt (c)2020-2021
// Use of this source code is governed by an MIT
// license that can be found in the LICENSE file.
// This file is contains the main driver code for the Raspberry Pi side of
// the Apple2-IO-RPi hardware. Commands are sent from the Apple II and
// responses are sent back from the Raspberry Pi.
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package main
import (
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"flag"
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"fmt"
"os"
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"path/filepath"
"time"
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"github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver/a2io"
"github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver/handlers"
)
const resetCommand = 0
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const readBlockCommand = 1
const writeBlockCommand = 2
const getTimeCommand = 3
const changeDriveCommand = 4 // not currently used
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const execCommand = 5
const loadFileCommand = 6
const saveFileCommand = 7 // not implemented yet
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const menuCommand = 8
const shellCommand = 9
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func main() {
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drive1, drive2 := getDriveFiles()
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fmt.Printf("Starting Apple II RPi...\n")
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comm := a2io.A2Gpio{}
handlers.SetCommunication(comm)
comm.Init()
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lastCommandTime := time.Now()
// In case Apple II is waiting, send 0 byte to start
comm.WriteByte(0)
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for {
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command, err := comm.ReadByte()
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if err == nil {
lastCommandTime = time.Now()
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switch command {
case resetCommand:
handlers.ResetCommand()
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case readBlockCommand:
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handlers.ReadBlockCommand(drive1, drive2)
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case writeBlockCommand:
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handlers.WriteBlockCommand(drive1, drive2)
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case getTimeCommand:
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handlers.GetTimeCommand()
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case execCommand:
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handlers.ExecCommand()
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case loadFileCommand:
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handlers.LoadFileCommand()
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case menuCommand:
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handlers.MenuCommand()
case shellCommand:
handlers.ShellCommand()
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}
// temporary workaround for busy wait loop heating up the RPi
} else if time.Since(lastCommandTime) > time.Millisecond*100 {
time.Sleep(time.Millisecond * 100)
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}
}
}
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func getDriveFiles() (*os.File, *os.File) {
var drive1Name string
var drive2Name string
execName, _ := os.Executable()
path := filepath.Dir(execName)
path = filepath.Join(path, "..")
path, _ = filepath.EvalSymlinks(path)
defaultFileName := filepath.Join(path, "Apple2-IO-RPi.hdv")
flag.StringVar(&drive1Name, "d1", "", "A ProDOS format drive image for drive 1")
flag.StringVar(&drive2Name, "d2", defaultFileName, "A ProDOS format drive image for drive 2 and will be used for drive 1 if drive 1 empty")
flag.Parse()
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var drive1 *os.File
var drive2 *os.File
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var err error
if len(drive1Name) > 0 {
fmt.Printf("Opening Drive 1 as: %s\n", drive1Name)
drive1, err = os.OpenFile(drive1Name, os.O_RDWR, 0755)
if err != nil {
fmt.Printf("ERROR: %s", err.Error())
os.Exit(1)
}
}
if len(drive2Name) > 0 {
if drive1 == nil {
fmt.Printf("Opening Drive 1 as: %s because Drive 1 was empty\n", drive2Name)
drive1, err = os.OpenFile(drive2Name, os.O_RDWR, 0755)
if err != nil {
fmt.Printf("ERROR: %s", err.Error())
os.Exit(1)
}
} else {
fmt.Printf("Opening Drive 2 as: %s\n", drive2Name)
drive2, err = os.OpenFile(drive2Name, os.O_RDWR, 0755)
if err != nil {
fmt.Printf("ERROR: %s", err.Error())
os.Exit(1)
}
}
}
if drive1 == nil {
flag.PrintDefaults()
os.Exit(1)
}
return drive1, drive2
}