grim/gousb2snes

Initial import, lots of hard coding
draft
2019-02-27, Gary Kramlich
32c861e0f399
Parents
Children c3cd4e43b5a9
Initial import, lots of hard coding
7 files changed, 258 insertions(+), 0 deletions(-)
  • +3 -0
    .hgignore
  • +23 -0
    commands/byteslice.go
  • +49 -0
    commands/commands.go
  • +86 -0
    commands/info.go
  • +15 -0
    commands/string.go
  • +37 -0
    main.go
  • +45 -0
    protocol/consts.go
    • --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/.hgignore Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,3 @@
    +syntax: glob
    +gousb2snes
    +
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/commands/byteslice.go Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,23 @@
    +package commands
    +
    +// overwrite will overwrite the a with the entire run of b
    +func overwrite(a, b []byte) {
    + for i, v := range b {
    + a[i] = v
    + }
    +}
    +
    +// equal checks if byte slice a starts with b
    +func equal(a, b []byte) bool {
    + if len(a) < len(b) {
    + return false
    + }
    +
    + for i, v := range b {
    + if a[i] != v {
    + return false
    + }
    + }
    +
    + return true
    +}
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/commands/commands.go Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,49 @@
    +package commands
    +
    +import (
    + "errors"
    + "io"
    +
    + "bitbucket.org/rw_grim/gousb2snes/protocol"
    +)
    +
    +type Command interface {
    + Send(rwc io.ReadWriteCloser) error
    +}
    +
    +func sync(rwc io.ReadWriteCloser, opcode protocol.OpCode, ns protocol.Namespace, flags protocol.Flag) ([]byte, error) {
    + req := make([]byte, 512)
    + header := []byte{'U', 'S', 'B', 'A', byte(opcode), byte(ns), byte(flags)}
    +
    + overwrite(req, header)
    +
    + n, err := rwc.Write(req)
    + if err != nil {
    + return nil, err
    + }
    +
    + if n == 0 {
    + return nil, errors.New("failed to write!")
    + }
    +
    + resp := make([]byte, 512)
    + total := 0
    + for total < 512 {
    + n, err = rwc.Read(resp[total:])
    + total += n
    +
    + if err != nil {
    + return nil, err
    + }
    + }
    +
    + if !equal(resp, []byte{'U', 'S', 'B', 'A', byte(protocol.OpCodeResponse)}) {
    + return nil, errors.New("Bad response")
    + }
    +
    + if resp[5] == 1 {
    + return nil, errors.New("Bad response")
    + }
    +
    + return resp, nil
    +}
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/commands/info.go Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,86 @@
    +package commands
    +
    +import (
    + "encoding/binary"
    + "fmt"
    + "io"
    + "strings"
    +
    + "bitbucket.org/rw_grim/gousb2snes/protocol"
    +)
    +
    +type Info struct {
    + version string
    + fwver string
    + features InfoFeature
    + rom string
    +}
    +
    +type InfoFeature byte
    +
    +const (
    + InfoFeatureDSPX InfoFeature = 1 << iota
    + InfoFeatureST0010
    + InfoFeatureSRTC
    + InfoFeatureMSU1
    + InfoFeature213F
    + InfoFeatureCmdUnlock
    + InfoFeatureUSB1
    + InfoFeatureDMA1
    +)
    +
    +func (f InfoFeature) String() string {
    + r := []string{}
    +
    + if f&InfoFeatureDSPX != 0 {
    + r = append(r, "FEAT_DSPX")
    + }
    + if f&InfoFeatureST0010 != 0 {
    + r = append(r, "FEAT_ST0010")
    + }
    + if f&InfoFeatureSRTC != 0 {
    + r = append(r, "FEAT_SRTC")
    + }
    + if f&InfoFeatureMSU1 != 0 {
    + r = append(r, "FEAT_MSU1")
    + }
    + if f&InfoFeature213F != 0 {
    + r = append(r, "FEAT_213F")
    + }
    + if f&InfoFeatureCmdUnlock != 0 {
    + r = append(r, "FEAT_CMD_UNLOCK")
    + }
    + if f&InfoFeatureUSB1 != 0 {
    + r = append(r, "FEAT_USB1")
    + }
    + if f&InfoFeatureDMA1 != 0 {
    + r = append(r, "FEAT_DMA1")
    + }
    + return strings.Join(r, "|")
    +}
    +
    +func (i *Info) Send(rwc io.ReadWriteCloser) error {
    + resp, err := sync(rwc, protocol.OpCodeInfo, protocol.NamespaceSNES, protocol.FlagNone)
    + if err != nil {
    + return err
    + }
    +
    + fwver := binary.BigEndian.Uint32(resp[256:])
    + i.fwver = fmt.Sprintf("%08x", fwver)
    +
    + i.version = nullTerminated(resp[260:])
    + i.features = InfoFeature(resp[6])
    + i.rom = nullTerminated(resp[16:])
    +
    + return nil
    +}
    +
    +func (i *Info) String() string {
    + return fmt.Sprintf(
    + "version: %s\nfwver: %s\nfeatures: %s\nrom: %s",
    + i.version,
    + i.fwver,
    + i.features,
    + i.rom,
    + )
    +}
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/commands/string.go Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,15 @@
    +package commands
    +
    +func nullTerminated(buffer []byte) string {
    + r := ""
    +
    + for _, b := range buffer {
    + if b == 0x0 {
    + break
    + }
    +
    + r += string(b)
    + }
    +
    + return r
    +}
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/main.go Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,37 @@
    +package main
    +
    +import (
    + "fmt"
    + "os"
    +
    + "github.com/jacobsa/go-serial/serial"
    +
    + "bitbucket.org/rw_grim/gousb2snes/commands"
    +)
    +
    +func main() {
    + opts := serial.OpenOptions{
    + PortName: "/dev/ttyACM0",
    + BaudRate: 9600,
    + DataBits: 8,
    + StopBits: 1,
    + MinimumReadSize: 4,
    + }
    +
    + sock, err := serial.Open(opts)
    + if err != nil {
    + fmt.Printf("failed to open serial device : %v\n", err)
    + os.Exit(1)
    + }
    +
    + defer sock.Close()
    +
    + info := &commands.Info{}
    + err = info.Send(sock)
    + if err != nil {
    + fmt.Printf("error: %v\n", err)
    + return
    + }
    +
    + fmt.Printf("-----\n%s\n", info)
    +}
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/protocol/consts.go Wed Feb 27 00:21:12 2019 -0600
    @@ -0,0 +1,45 @@
    +package protocol
    +
    +type OpCode byte
    +
    +const (
    + OpCodeGet OpCode = iota
    + OpCodePut
    + OpCodeVGet
    + OpCodeVPut
    + OpCodeLs
    + OpCodeMkdir
    + OpCodeRm
    + OpCodeMv
    + OpCodeReset
    + OpCodeBoot
    + OpCodePowerCycle
    + OpCodeInfo
    + OpCodeMenuReset
    + OpCodeStream
    + OpCodeTime
    + OpCodeResponse
    +)
    +
    +type Flag byte
    +
    +const (
    + FlagNone Flag = 1 << iota
    + FlagSkiPreset
    + FlagOnlyReset
    + FlagClrX
    + FlagSetX
    + FlagStreamBurst
    + FlagNoResponse
    + FlagData64B
    +)
    +
    +type Namespace byte
    +
    +const (
    + NamespaceFile Namespace = iota
    + NamespaceSNES
    + NamespaceMSU
    + NamespaceCommand
    + NamespaceConfig
    +)