mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-11-22 02:30:46 +00:00
450 lines
9.3 KiB
Go
450 lines
9.3 KiB
Go
package main
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import (
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"bytes"
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"errors"
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"fmt"
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"os"
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"os/exec"
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"periph.io/x/periph/conn/gpio"
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"periph.io/x/periph/conn/gpio/gpioreg"
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"periph.io/x/periph/host"
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"strings"
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"time"
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)
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var edgeTimeout time.Duration
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var out_write gpio.PinIO
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var out_read gpio.PinIO
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var out_reserved2 gpio.PinIO
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var out_reserved1 gpio.PinIO
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var out_bit7 gpio.PinIO
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var out_bit6 gpio.PinIO
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var out_bit5 gpio.PinIO
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var out_bit4 gpio.PinIO
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var out_bit3 gpio.PinIO
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var out_bit2 gpio.PinIO
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var out_bit1 gpio.PinIO
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var out_bit0 gpio.PinIO
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var in_write gpio.PinIO
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var in_read gpio.PinIO
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var in_reserved2 gpio.PinIO
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var in_reserved1 gpio.PinIO
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var in_bit7 gpio.PinIO
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var in_bit6 gpio.PinIO
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var in_bit5 gpio.PinIO
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var in_bit4 gpio.PinIO
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var in_bit3 gpio.PinIO
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var in_bit2 gpio.PinIO
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var in_bit1 gpio.PinIO
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var in_bit0 gpio.PinIO
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const ReadBlockCommand = 1
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const WriteBlockCommand = 2
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const GetTimeCommand = 3
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const ChangeDriveCommand = 4
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const ExecCommand = 5
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var debug bool = false
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func main() {
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host.Init()
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initGpio()
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if len(os.Args) == 3 && os.Args[2] == "--debug" {
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debug = true
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}
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fmt.Printf("Starting Apple II RPi...\n")
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fileName := os.Args[1]
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file, err := os.OpenFile(fileName, os.O_RDWR, 0755)
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if err != nil {
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fmt.Printf("ERROR: %s", err.Error())
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os.Exit(1)
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}
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for {
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if debug {
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fmt.Printf("Check for command\n")
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}
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command, err := readByte()
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if err != nil {
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//fmt.Printf("Timed out waiting for command\n")
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} else {
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switch command {
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case ReadBlockCommand:
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handleReadBlockCommand(file)
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case WriteBlockCommand:
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handleWriteBlockCommand(file)
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case GetTimeCommand:
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handleGetTimeCommand()
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case ExecCommand:
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handleExecCommand()
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}
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}
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}
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}
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func handleReadBlockCommand(file *os.File) {
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blockLow, _ := readByte()
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blockHigh, _ := readByte()
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buffer := make([]byte, 512)
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var block int64
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block = int64(blockHigh)*256 + int64(blockLow)
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fmt.Printf("Read block %d\n", block)
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file.ReadAt(buffer, int64(block)*512)
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//dumpBlock(buffer)
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err := readBlock(buffer)
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if err == nil {
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fmt.Printf("Read block completed\n")
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} else {
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fmt.Printf("Failed to read block\n")
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}
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}
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func handleWriteBlockCommand(file *os.File) {
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blockLow, _ := readByte()
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blockHigh, _ := readByte()
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buffer := make([]byte, 512)
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var block int64
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block = int64(blockHigh)*256 + int64(blockLow)
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fmt.Printf("Write block %d\n", block)
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writeBlock(buffer)
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file.WriteAt(buffer, int64(block)*512)
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file.Sync()
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fmt.Printf("Write block completed\n")
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}
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func handleExecCommand() {
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fmt.Printf("Reading command to execute...\n")
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linuxCommand, err := readString()
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fmt.Printf("Command to run: %s\n", linuxCommand)
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cmd := exec.Command("bash", "-c", linuxCommand)
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cmdOut, err := cmd.Output()
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if err != nil {
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fmt.Printf("Failed to execute command\n")
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writeString("Failed to execute command")
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return
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}
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fmt.Printf("Command output: %s\n", cmdOut)
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apple2string := strings.Replace(string(cmdOut), "\n", "\r", -1)
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err = writeString(apple2string)
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if err != nil {
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fmt.Printf("Failed to send command output\n")
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return
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}
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}
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func handleGetTimeCommand() {
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fmt.Printf("Sending date/time...\n")
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/* 49041 ($BF91) 49040 ($BF90)
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7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
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+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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DATE: | year | month | day |
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+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
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+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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TIME: | hour | | minute |
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+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
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49043 ($BF93) 49042 ($BF92)
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*/
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now := time.Now()
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year := now.Year() % 100
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month := now.Month()
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day := now.Day()
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hour := now.Hour()
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minute := now.Minute()
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bf91 := (byte(year) << 1) + (byte(month) >> 3)
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bf90 := ((byte(month) & 15) << 5) + byte(day)
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bf93 := byte(hour)
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bf92 := byte(minute)
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writeByte(bf90)
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writeByte(bf91)
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writeByte(bf92)
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writeByte(bf93)
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fmt.Printf("Send time complete\n")
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}
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func readBlock(buffer []byte) error {
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for i := 0; i < 512; i++ {
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err := writeByte(buffer[i])
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if err != nil {
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return err
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}
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}
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return nil
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}
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func writeBlock(buffer []byte) error {
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var err error
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for i := 0; i < 512; i++ {
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buffer[i], err = readByte()
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if err != nil {
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return err
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}
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}
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return nil
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}
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func initGpio() {
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out_write = gpioreg.ByName("GPIO24")
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out_read = gpioreg.ByName("GPIO25")
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out_reserved2 = gpioreg.ByName("GPIO7") //note GPIO7 and CPIO8 require extra effort to use
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out_reserved1 = gpioreg.ByName("GPIO8")
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out_bit7 = gpioreg.ByName("GPIO5")
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out_bit6 = gpioreg.ByName("GPIO11")
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out_bit5 = gpioreg.ByName("GPIO9")
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out_bit4 = gpioreg.ByName("GPIO10")
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out_bit3 = gpioreg.ByName("GPIO22")
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out_bit2 = gpioreg.ByName("GPIO27")
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out_bit1 = gpioreg.ByName("GPIO17")
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out_bit0 = gpioreg.ByName("GPIO4")
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in_write = gpioreg.ByName("GPIO23")
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in_read = gpioreg.ByName("GPIO18")
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in_reserved2 = gpioreg.ByName("GPIO14")
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in_reserved1 = gpioreg.ByName("GPIO15")
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in_bit7 = gpioreg.ByName("GPIO12")
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in_bit6 = gpioreg.ByName("GPIO16")
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in_bit5 = gpioreg.ByName("GPIO20")
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in_bit4 = gpioreg.ByName("GPIO21")
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in_bit3 = gpioreg.ByName("GPIO26")
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in_bit2 = gpioreg.ByName("GPIO19")
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in_bit1 = gpioreg.ByName("GPIO13")
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in_bit0 = gpioreg.ByName("GPIO6")
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in_write.In(gpio.PullDown, gpio.BothEdges)
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in_read.In(gpio.PullDown, gpio.BothEdges)
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out_reserved1.Out(gpio.High)
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out_reserved2.Out(gpio.High)
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out_read.Out(gpio.High)
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out_write.Out(gpio.High)
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out_bit7.Out(gpio.Low)
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out_bit6.Out(gpio.Low)
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out_bit5.Out(gpio.Low)
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out_bit4.Out(gpio.Low)
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out_bit3.Out(gpio.Low)
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out_bit2.Out(gpio.Low)
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out_bit1.Out(gpio.Low)
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out_bit0.Out(gpio.Low)
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edgeTimeout = time.Second * 5
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}
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func dumpBlock(buffer []byte) {
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for i := 0; i < 512; i++ {
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fmt.Printf("%02X ", buffer[i])
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}
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}
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func readString() (string, error) {
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var inBytes bytes.Buffer
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for {
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inByte, err := readByte()
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if err != nil {
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return "", err
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}
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if inByte == 0 {
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break
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}
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inBytes.WriteByte(inByte)
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}
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return string(inBytes.Bytes()), nil
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}
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func writeString(outString string) error {
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for _, character := range outString {
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err := writeByte(byte(character) | 128)
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if err != nil {
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fmt.Printf("Failed to write string\n")
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return err
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}
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}
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writeByte(0)
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return nil
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}
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func readByte() (byte, error) {
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// let the Apple II know we are ready to read
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if debug {
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fmt.Printf("let the Apple II know we are ready to read\n")
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}
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out_read.Out(gpio.Low)
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// wait for the Apple II to write
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if debug {
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fmt.Printf("wait for the Apple II to write\n")
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}
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for in_write.Read() == gpio.High {
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if !in_write.WaitForEdge(edgeTimeout) {
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if debug {
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fmt.Printf("Timed out reading byte -- write stuck high\n")
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}
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return 0, errors.New("Timed out reading byte -- write stuck high\n")
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}
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}
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// get a nibble of data
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if debug {
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fmt.Printf("get a byte of data\n")
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}
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var data byte
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data = 0
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bit7 := in_bit7.Read()
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bit6 := in_bit6.Read()
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bit5 := in_bit5.Read()
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bit4 := in_bit4.Read()
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bit3 := in_bit3.Read()
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bit2 := in_bit2.Read()
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bit1 := in_bit1.Read()
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bit0 := in_bit0.Read()
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if bit7 == gpio.High {
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data += 128
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}
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if bit6 == gpio.High {
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data += 64
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}
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if bit5 == gpio.High {
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data += 32
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}
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if bit4 == gpio.High {
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data += 16
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}
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if bit3 == gpio.High {
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data += 8
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}
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if bit2 == gpio.High {
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data += 4
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}
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if bit1 == gpio.High {
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data += 2
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}
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if bit0 == gpio.High {
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data += 1
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}
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// let the Apple II know we are done reading
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//fmt.Printf("let the Apple II know we are done reading\n")
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out_read.Out(gpio.High)
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// wait for the Apple II to finish writing
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//fmt.Printf("wait for the Apple II to finish writing\n")
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for in_write.Read() == gpio.Low {
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if !in_write.WaitForEdge(edgeTimeout) {
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if debug {
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fmt.Printf("Timed out reading byte -- write stuck low\n")
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}
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return 0, errors.New("Timed out reading byte -- write stuck low")
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}
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}
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return data, nil
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}
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func writeByte(data byte) error {
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// wait for the Apple II to be ready to read
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if debug {
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fmt.Printf("wait for the Apple II to be ready to read\n")
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}
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for in_read.Read() == gpio.High {
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if !in_read.WaitForEdge(edgeTimeout) {
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if debug {
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fmt.Printf("Timed out writing byte -- read stuck high\n")
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}
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return errors.New("Timed out writing byte -- read stuck high")
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}
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}
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bit7 := gpio.Low
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bit6 := gpio.Low
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bit5 := gpio.Low
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bit4 := gpio.Low
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bit3 := gpio.Low
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bit2 := gpio.Low
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bit1 := gpio.Low
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bit0 := gpio.Low
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if ((data & 128) >> 7) == 1 {
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bit7 = gpio.High
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}
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out_bit7.Out(bit7)
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if ((data & 64) >> 6) == 1 {
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bit6 = gpio.High
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}
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out_bit6.Out(bit6)
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if ((data & 32) >> 5) == 1 {
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bit5 = gpio.High
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}
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out_bit5.Out(bit5)
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if ((data & 16) >> 4) == 1 {
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bit4 = gpio.High
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}
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out_bit4.Out(bit4)
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if ((data & 8) >> 3) == 1 {
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bit3 = gpio.High
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}
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out_bit3.Out(bit3)
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if ((data & 4) >> 2) == 1 {
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bit2 = gpio.High
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}
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out_bit2.Out(bit2)
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if ((data & 2) >> 1) == 1 {
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bit1 = gpio.High
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}
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out_bit1.Out(bit1)
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if (data & 1) == 1 {
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bit0 = gpio.High
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}
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out_bit0.Out(bit0)
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// let Apple II know we're writing
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if debug {
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fmt.Printf("let Apple II know we're writing\n")
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}
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out_write.Out(gpio.Low)
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// wait for the Apple II to finsih reading
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//fmt.Printf("wait for the Apple II to finsih reading\n")
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for in_read.Read() == gpio.Low {
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if !in_read.WaitForEdge(edgeTimeout) {
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if debug {
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fmt.Printf("Timed out writing byte -- read stuck low\n")
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}
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return errors.New("Timed out writing byte -- read stuck low")
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}
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}
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// let the Apple II know we are done writing
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if debug {
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fmt.Printf("let the Apple II know we are done writing\n")
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}
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out_write.Out(gpio.High)
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return nil
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}
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