diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Makefile | 21 | ||||
| -rw-r--r-- | autorun.sh | 3 | ||||
| -rw-r--r-- | cmd/ipp/main.go | 62 | ||||
| -rw-r--r-- | cvend/cvend.go | 189 | ||||
| -rw-r--r-- | go.mod | 5 | ||||
| -rw-r--r-- | go.sum | 2 |
7 files changed, 283 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ae3c172 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/bin/ diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..354ad49 --- /dev/null +++ b/Makefile @@ -0,0 +1,21 @@ +export GOOS=linux +export GOARCH=arm +export GOARM=7 + +USB_ROOT=/Volumes/MP_SD + +GOSOURCES:=$(shell find . -name *.go) + +all: bin/ipp + +clean: + rm -r bin + +bin/%: ${GOSOURCES} + mkdir -p bin + go build -o $@ ./cmd/$* + +usb: autorun.sh bin/ipp + install autorun.sh ${USB_ROOT}/ + install -d ${USB_ROOT}/bin/ + install bin/ipp ${USB_ROOT}/bin/ diff --git a/autorun.sh b/autorun.sh new file mode 100644 index 0000000..21e4a46 --- /dev/null +++ b/autorun.sh @@ -0,0 +1,3 @@ +#!/bin/bash -x +cd "$(dirname "$0")" +exec ./bin/ipp -f diff --git a/cmd/ipp/main.go b/cmd/ipp/main.go new file mode 100644 index 0000000..85207a8 --- /dev/null +++ b/cmd/ipp/main.go @@ -0,0 +1,62 @@ +package main + +import ( + "encoding/hex" + "flag" + "log" + "strconv" + "time" + + "pm3.dev/cvend" +) + +var wait = flag.Duration("w", 5*time.Second, "how long to wait for a response") +var follow = flag.Bool("f", false, "don't exit after response") + +func main() { + flag.Parse() + log.SetFlags(log.Lshortfile) + wc := make(chan struct{}, 1) + cv, err := cvend.Open(cvend.Path, func(msgType byte, msgData []byte) { + log.Printf("ipp %02x\n%s", msgType, hex.Dump(msgData)) + select { + case wc <- struct{}{}: + default: + } + }) + if err != nil { + panic(err) + } + defer cv.Close() + if flag.NArg() == 0 { + select {} + } + for i := 0; i < flag.NArg(); i += 2 { + var msgType byte + var msgData []byte + if n, err := strconv.ParseUint(flag.Arg(i), 0, 8); err != nil { + panic(err) + } else { + msgType = byte(n) + } + if flag.NArg() >= i { + if bs, err := hex.DecodeString(flag.Arg(i + 1)); err != nil { + panic(err) + } else { + msgData = bs + } + } + if err := cv.SendIPP(msgType, msgData); err != nil { + panic(err) + } + if *wait > 0 { + select { + case <-wc: + case <-time.After(*wait): + } + } + } + if *follow { + select {} + } +} diff --git a/cvend/cvend.go b/cvend/cvend.go new file mode 100644 index 0000000..52c7227 --- /dev/null +++ b/cvend/cvend.go @@ -0,0 +1,189 @@ +package cvend + +import ( + "encoding/binary" + "encoding/hex" + "hash/crc32" + "io" + "log" + "sync" + + "golang.org/x/sys/unix" +) + +const Path = "/dev/ttymxc3" + +var crc8table = [256]byte{ + 0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83, 0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41, + 0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e, 0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc, + 0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0, 0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62, + 0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d, 0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff, + 0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5, 0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07, + 0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58, 0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a, + 0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6, 0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24, + 0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b, 0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9, + 0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f, 0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd, + 0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92, 0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50, + 0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c, 0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee, + 0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1, 0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73, + 0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49, 0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b, + 0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4, 0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16, + 0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a, 0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8, + 0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7, 0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35, +} + +func crc8(bs ...byte) (x byte) { + for _, b := range bs { + x = crc8table[x^b] + } + return +} + +type IPPHandler func(byte, []byte) + +type Device interface { + io.Closer + io.Writer + SendIPP(ippType byte, ippData []byte) error +} + +type device struct { + fd int + handler IPPHandler + mu sync.Mutex + nextSeqOut byte // mu + closed bool // mu +} + +func Open(path string, handler IPPHandler) (Device, error) { + var d device + d.handler = handler + var err error + d.fd, err = unix.Open(path, unix.O_RDWR|unix.O_NOCTTY, 0) + if err != nil { + return nil, err + } + var termios *unix.Termios + termios, err = unix.IoctlGetTermios(d.fd, unix.TCGETS) + if err != nil { + return nil, err + } + termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON + termios.Oflag &^= unix.OPOST + termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN + termios.Cflag &^= unix.CBAUD | unix.CSIZE | unix.PARENB | unix.CSTOPB + termios.Cflag |= unix.B115200 | unix.CS8 | unix.CREAD | unix.CLOCAL + err = unix.IoctlSetTermios(d.fd, unix.TCSETS, termios) + if err != nil { + return nil, err + } + go d.readTask() + return &d, nil +} + +func (d *device) readTask() { + var bs [1 << 16]byte + var offset int + for { + n, err := unix.Read(d.fd, bs[offset:]) + if err != nil { + d.mu.Lock() + closed := d.closed + d.mu.Unlock() + if closed { + break + } + panic(err) + } + nRead := d.handleMsg(bs[:offset+n]) + offset = copy(bs[:], bs[nRead:offset+n]) + } +} + +func (d *device) handleMsg(bs []byte) (nRead int) { + expectedLen := 1 + if len(bs) < expectedLen { + log.Printf("skipping empty message") + return + } + msgType := bs[0] + if msgType != 0xbc { + log.Printf("skipping non-IPP message %s", hex.EncodeToString(bs)) + nRead = len(bs) + return + } + expectedLen += 6 + if len(bs) < expectedLen { + log.Printf("skipping truncated IPP message %s", hex.EncodeToString(bs)) + return + } + _ = bs[1] // seq + _ = bs[2] // unknown + ippType := bs[3] + ippLen := int(bs[4])<<8 + int(bs[5]) + hdrCRC := bs[6] + expectedHdrCRC := crc8(bs[0:6]...) + if hdrCRC != expectedHdrCRC { + log.Printf("skipping IPP message %02x, expected crc8 %02x got %02x", ippType, expectedHdrCRC, hdrCRC) + return + } + expectedLen += ippLen + hasMsgCRC := ippType&0x80 != 0 + if hasMsgCRC { + expectedLen += 4 + } + if len(bs) < expectedLen { + log.Printf("skipping truncated IPP message %s", hex.EncodeToString(bs)) + return + } + nRead = expectedLen + ippData := bs[7 : 7+ippLen] + if hasMsgCRC { + msgCRC := bs[7+ippLen : 7+ippLen+4] + expectedMsgCRC := ^crc32.ChecksumIEEE(ippData) + actualMsgCRC := binary.LittleEndian.Uint32(msgCRC) + if actualMsgCRC != expectedMsgCRC { + log.Printf("skipping IPP message %02x, expected crc32 %08x got %08x", expectedMsgCRC, actualMsgCRC) + return + } + } + if d.handler != nil { + d.handler(ippType, ippData) + } + return +} + +func (d *device) Close() error { + d.mu.Lock() + defer d.mu.Unlock() + d.closed = true + return unix.Close(d.fd) +} + +func (d *device) Write(bs []byte) (int, error) { + log.Printf("send %s", hex.EncodeToString(bs)) + return unix.Write(d.fd, bs) +} + +func (d *device) SendIPP(ippType byte, ippData []byte) error { + d.mu.Lock() + d.nextSeqOut++ + if d.nextSeqOut == 0 { + d.nextSeqOut++ + } + seq := d.nextSeqOut + d.mu.Unlock() + ippLen := len(ippData) + ippHdr := []byte{0xbc, seq, 0, ippType, byte(ippLen >> 8), byte(ippLen), 0} + ippHdr[6] = crc8(ippHdr[:6]...) + var msgCRC []byte + if ippType&0x80 != 0 { + msgCRC = make([]byte, 4) + binary.LittleEndian.PutUint32(msgCRC, ^crc32.ChecksumIEEE(ippData)) + } + log.Printf("send %s%s%s", hex.EncodeToString(ippHdr), hex.EncodeToString(ippData), hex.EncodeToString(msgCRC)) + if _, err := unix.Writev(d.fd, [][]byte{ippHdr, ippData, msgCRC}); err != nil { + return err + } + return nil +} @@ -0,0 +1,5 @@ +module pm3.dev + +go 1.24.0 + +require golang.org/x/sys v0.41.0 // indirect @@ -0,0 +1,2 @@ +golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k= +golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks= |