Apple2-IO-RPi/RaspberryPi/apple2driver/driver.go
2022-01-10 23:00:58 -05:00

129 lines
3.1 KiB
Go

// Copyright Terence J. Boldt (c)2020-2022
// Use of this source code is governed by an MIT
// license that can be found in the LICENSE file.
// This file 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.
package main
import (
"flag"
"fmt"
"os"
"path/filepath"
"time"
"github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver/a2io"
"github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver/handlers"
)
const resetCommand = 0
const readBlockCommand = 1
const writeBlockCommand = 2
const getTimeCommand = 3
const changeDriveCommand = 4 // not currently used
const execCommand = 5
const loadFileCommand = 6
const saveFileCommand = 7 // not implemented yet
const menuCommand = 8
const shellCommand = 9
func main() {
drive1, drive2 := getDriveFiles()
fmt.Printf("Starting Apple II RPi...\n")
comm := a2io.A2Gpio{}
handlers.SetCommunication(comm)
comm.Init()
lastCommandTime := time.Now()
// In case Apple II is waiting, send 0 byte to start
comm.WriteByte(0)
for {
command, err := comm.ReadByte()
if err == nil {
lastCommandTime = time.Now()
switch command {
case resetCommand:
handlers.ResetCommand()
case readBlockCommand:
handlers.ReadBlockCommand(drive1, drive2)
case writeBlockCommand:
handlers.WriteBlockCommand(drive1, drive2)
case getTimeCommand:
handlers.GetTimeCommand()
case execCommand:
handlers.ExecCommand()
case loadFileCommand:
handlers.LoadFileCommand()
case menuCommand:
handlers.MenuCommand()
case shellCommand:
handlers.ShellCommand()
}
// temporary workaround for busy wait loop heating up the RPi
} else if time.Since(lastCommandTime) > time.Millisecond*100 {
time.Sleep(time.Millisecond * 100)
}
}
}
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()
var drive1 *os.File
var drive2 *os.File
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
}