mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-06-08 19:29:31 +00:00
305 lines
6.8 KiB
Go
305 lines
6.8 KiB
Go
package main
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import (
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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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"fmt"
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"os"
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"time"
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"errors"
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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_commandWrite gpio.PinIO
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var out_commandRead 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_commandWrite gpio.PinIO
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var in_commandRead 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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func readNibble() (byte, error) {
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// let the Apple II know we are ready to read
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//fmt.Printf("let the Apple II know we are ready to read\n")
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out_read.Out(gpio.Low)
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// wait for the Apple II to write
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//fmt.Printf("wait for the Apple II to write\n")
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for in_write.Read() == gpio.High {
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if !in_write.WaitForEdge(edgeTimeout) {
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//fmt.Printf("Timed out reading nibble -- write stuck high\n")
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return 0, errors.New("Timed out reading nibble -- 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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//fmt.Printf("get a nibble of data\n")
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var nibble byte
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nibble = 0
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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 bit3 == gpio.High {
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nibble += 8
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}
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if bit2 == gpio.High {
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nibble += 4
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}
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if bit1 == gpio.High {
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nibble += 2
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}
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if bit0 == gpio.High {
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nibble += 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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//fmt.Printf("Timed out reading nibble -- write stuck low\n")
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return 0, errors.New("Timed out reading nibble -- write stuck low")
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}
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}
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return nibble, nil
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}
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func readByte() (byte, error) {
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data, err := readNibble()
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data = data << byte(4)
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if err != nil { return 0, err }
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highNibble, err := readNibble()
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if err != nil { return 0, err }
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data += highNibble
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//fmt.Printf("R%02X ", data)
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return data, nil
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}
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func writeNibble(data byte) error {
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// wait for the Apple II to be ready to read
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//fmt.Printf("wait for the Apple II to be ready to read\n")
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for in_read.Read() == gpio.High {
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if !in_read.WaitForEdge(edgeTimeout) {
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//fmt.Printf("Timed out writing nibble -- read stuck high\n")
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return errors.New("Timed out writing nibble -- read stuck high")
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}
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}
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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 & 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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//fmt.Printf("let Apple II know we're writing\n")
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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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//fmt.Printf("Timed out writing nibble -- read stuck low\n")
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return errors.New("Timed out writing nibble -- 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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//fmt.Printf("let the Apple II know we are done writing\n")
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out_write.Out(gpio.High)
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return nil
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}
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func writeByte(data byte) error {
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//fmt.Printf("W%02X ", data)
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err := writeNibble(data >> 4)
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if err != nil { return err }
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err = writeNibble(data & 15)
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if err != nil { return err }
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return nil
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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 { return err }
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}
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return nil
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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 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 { return err }
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}
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return nil
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}
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func main() {
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host.Init()
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out_write = gpioreg.ByName("GPIO5")
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out_read = gpioreg.ByName("GPIO11")
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out_commandWrite = gpioreg.ByName("GPIO9")
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out_commandRead = 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("GPIO12")
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in_read = gpioreg.ByName("GPIO16")
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in_commandWrite = gpioreg.ByName("GPIO20")
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in_commandRead = 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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edgeTimeout = time.Second * 5
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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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//if err := f.Close(); err != nil {
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//log.Fatal(err)
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//}
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//for in_write.Read() == gpio.Low {
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// in_write.WaitForEdge(-1)
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//}
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buffer := make([]byte, 512)
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//file.ReadAt(buffer, int64(0) * 512)
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//dumpBlock(buffer)
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for {
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//fmt.Printf("Check for command")
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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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blockLow,_ := readByte();
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blockHigh,_ := readByte();
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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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readBlock(buffer)
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break
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case WriteBlockCommand:
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blockLow,_ := readByte();
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blockHigh,_ := readByte();
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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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break
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case GetTimeCommand:
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/*
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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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break
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}
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}
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}
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}
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