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-rw-r--r--Makefile7
-rw-r--r--autorun.sh3
-rw-r--r--cmd/cvend-ipp/main.go58
-rw-r--r--cmd/ipp/main.go87
-rw-r--r--cmd/pic32-ipp/main.go58
-rw-r--r--cvend/cvend.go207
-rw-r--r--ipp/ipp.go191
-rw-r--r--pic32/pic32.go21
8 files changed, 367 insertions, 265 deletions
diff --git a/Makefile b/Makefile
index 354ad49..1620c85 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ USB_ROOT=/Volumes/MP_SD
GOSOURCES:=$(shell find . -name *.go)
-all: bin/ipp
+all: bin/cvend-ipp bin/pic32-ipp
clean:
rm -r bin
@@ -15,7 +15,8 @@ bin/%: ${GOSOURCES}
mkdir -p bin
go build -o $@ ./cmd/$*
-usb: autorun.sh bin/ipp
+usb: autorun.sh bin/cvend-ipp bin/pic32-ipp
install autorun.sh ${USB_ROOT}/
install -d ${USB_ROOT}/bin/
- install bin/ipp ${USB_ROOT}/bin/
+ install bin/cvend-ipp ${USB_ROOT}/bin/
+ install bin/pic32-ipp ${USB_ROOT}/bin/
diff --git a/autorun.sh b/autorun.sh
index 14b0fec..c67c48f 100644
--- a/autorun.sh
+++ b/autorun.sh
@@ -1,3 +1,4 @@
#!/bin/bash -x
cd "$(dirname "$0")"
-systemd-run -p StandardOutput=tty -d bin/ipp
+systemd-run -p StandardOutput=tty -d bin/cvend-ipp
+systemd-run -p StandardOutput=tty -d bin/pic32-ipp
diff --git a/cmd/cvend-ipp/main.go b/cmd/cvend-ipp/main.go
new file mode 100644
index 0000000..ce96732
--- /dev/null
+++ b/cmd/cvend-ipp/main.go
@@ -0,0 +1,58 @@
+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 | log.Ldate | log.Ltime | log.Lmicroseconds)
+ log.Println("cvend-ipp start")
+ wc := make(chan struct{}, 1)
+ s, err := cvend.OpenIPP(func(msgType byte, msgData []byte) {
+ cvend.LogIPP(msgType, msgData)
+ select {
+ case wc <- struct{}{}:
+ default:
+ }
+ })
+ if err != nil {
+ panic(err)
+ }
+ defer s.Close()
+ 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 bs, err := hex.DecodeString(flag.Arg(i + 1)); err != nil {
+ panic(err)
+ } else {
+ msgData = bs
+ }
+ if err := s.SendIPP(msgType, msgData); err != nil {
+ panic(err)
+ }
+ if *wait > 0 {
+ select {
+ case <-wc:
+ case <-time.After(*wait):
+ }
+ }
+ }
+ if *follow || flag.NArg() == 0 {
+ select {}
+ }
+}
diff --git a/cmd/ipp/main.go b/cmd/ipp/main.go
deleted file mode 100644
index 21cf0fc..0000000
--- a/cmd/ipp/main.go
+++ /dev/null
@@ -1,87 +0,0 @@
-package main
-
-import (
- "encoding/binary"
- "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 | log.Ldate | log.Ltime | log.Lmicroseconds)
- log.Println("start")
- wc := make(chan struct{}, 1)
- cv, err := cvend.Open(cvend.Path, func(msgType byte, msgData []byte) {
- switch msgType {
- case 0x07:
- log.Printf("Heartbeat(%s)", hex.EncodeToString(msgData))
- case 0x0f:
- log.Printf("Startup(%s)", hex.EncodeToString(msgData))
- case 0xed:
- if len(msgData) == 0 {
- log.Printf("Log()")
- } else {
- log.Printf("Log(%d) %q", msgData[0], string(msgData[1:]))
- }
- case 0xbe:
- if len(msgData) < 22 || len(msgData) < 22+int(msgData[21]) {
- log.Printf("PICCRead(short)\n%s", hex.Dump(msgData))
- } else {
- _ = msgData[:11] // unknown
- uid := msgData[11:18]
- atqa := binary.LittleEndian.Uint16(msgData[18:20])
- sak := msgData[20]
- atrLen := msgData[21]
- atr := msgData[22 : 22+atrLen]
- _ = msgData[22+atrLen:] // unknown
- log.Printf("PICCRead(uid %s atqa 0x%04x sak %02x atr %s)\n%s", hex.EncodeToString(uid), atqa, sak, hex.EncodeToString(atr), hex.Dump(msgData))
- }
- case 0xd1:
- log.Printf("EMVTransactionSuccessUnk\n%s", hex.Dump(msgData))
- default:
- log.Printf("ipp %02x\n%s", msgType, hex.Dump(msgData))
- }
- select {
- case wc <- struct{}{}:
- default:
- }
- })
- if err != nil {
- panic(err)
- }
- defer cv.Close()
- 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 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 || flag.NArg() == 0 {
- select {}
- }
-}
diff --git a/cmd/pic32-ipp/main.go b/cmd/pic32-ipp/main.go
new file mode 100644
index 0000000..34a1ec8
--- /dev/null
+++ b/cmd/pic32-ipp/main.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+ "encoding/hex"
+ "flag"
+ "log"
+ "strconv"
+ "time"
+
+ "pm3.dev/pic32"
+)
+
+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 | log.Ldate | log.Ltime | log.Lmicroseconds)
+ log.Println("pic32-ipp start")
+ wc := make(chan struct{}, 1)
+ s, err := pic32.OpenIPP(func(msgType byte, msgData []byte) {
+ pic32.LogIPP(msgType, msgData)
+ select {
+ case wc <- struct{}{}:
+ default:
+ }
+ })
+ if err != nil {
+ panic(err)
+ }
+ defer s.Close()
+ 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 bs, err := hex.DecodeString(flag.Arg(i + 1)); err != nil {
+ panic(err)
+ } else {
+ msgData = bs
+ }
+ if err := s.SendIPP(msgType, msgData); err != nil {
+ panic(err)
+ }
+ if *wait > 0 {
+ select {
+ case <-wc:
+ case <-time.After(*wait):
+ }
+ }
+ }
+ if *follow || flag.NArg() == 0 {
+ select {}
+ }
+}
diff --git a/cvend/cvend.go b/cvend/cvend.go
index 52c7227..0881db1 100644
--- a/cvend/cvend.go
+++ b/cvend/cvend.go
@@ -1,189 +1,48 @@
package cvend
import (
+ "bytes"
"encoding/binary"
"encoding/hex"
- "hash/crc32"
- "io"
"log"
- "sync"
- "golang.org/x/sys/unix"
+ "pm3.dev/ipp"
)
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)
+func OpenIPP(handler ipp.Handler) (ipp.Session, error) {
+ return ipp.Open(Path, handler)
+}
+
+func LogIPP(msgType byte, msgData []byte) {
+ switch msgType {
+ case 0x07:
+ log.Printf("Heartbeat(%s)", hex.EncodeToString(msgData))
+ case 0x0f:
+ log.Printf("Startup(%s)", hex.EncodeToString(msgData))
+ case 0xed:
+ if len(msgData) == 0 {
+ log.Printf("Log()")
+ } else {
+ log.Printf("Log(%d) %s", msgData[0], string(bytes.TrimSuffix(msgData[1:], []byte{0})))
}
- 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
+ case 0xbe:
+ if len(msgData) < 22 || len(msgData) < 22+int(msgData[21]) {
+ log.Printf("PICCRead(short)\n%s", hex.Dump(msgData))
+ } else {
+ _ = msgData[:11] // unknown
+ uid := msgData[11:18]
+ atqa := binary.LittleEndian.Uint16(msgData[18:20])
+ sak := msgData[20]
+ atrLen := msgData[21]
+ atr := msgData[22 : 22+atrLen]
+ _ = msgData[22+atrLen:] // unknown
+ log.Printf("PICCRead(uid %s atqa 0x%04x sak %02x atr %s)\n%s", hex.EncodeToString(uid), atqa, sak, hex.EncodeToString(atr), hex.Dump(msgData))
}
+ case 0xd1:
+ log.Printf("EMVStatus\n%s", hex.Dump(msgData))
+ default:
+ log.Printf("ipp %02x\n%s", msgType, hex.Dump(msgData))
}
- 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
}
diff --git a/ipp/ipp.go b/ipp/ipp.go
new file mode 100644
index 0000000..e9c1430
--- /dev/null
+++ b/ipp/ipp.go
@@ -0,0 +1,191 @@
+package ipp
+
+import (
+ "encoding/binary"
+ "encoding/hex"
+ "hash/crc32"
+ "io"
+ "log"
+ "sync"
+
+ "golang.org/x/sys/unix"
+)
+
+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 Handler func(byte, []byte)
+
+type Session interface {
+ io.Closer
+ io.Writer
+ SendIPP(ippType byte, ippData []byte) error
+}
+
+type session struct {
+ path string
+ fd int
+ handler Handler
+ mu sync.Mutex
+ nextSeqOut byte // mu
+ closed bool // mu
+}
+
+func Open(path string, handler Handler) (Session, error) {
+ fd, err := unix.Open(path, unix.O_RDWR|unix.O_NOCTTY, 0)
+ if err != nil {
+ return nil, err
+ }
+ termios, err := unix.IoctlGetTermios(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
+ if err = unix.IoctlSetTermios(fd, unix.TCSETS, termios); err != nil {
+ return nil, err
+ }
+
+ s := &session{
+ path: path,
+ fd: fd,
+ handler: handler,
+ }
+ go s.readTask()
+ return s, nil
+}
+
+func (s *session) readTask() {
+ var bs [1 << 16]byte
+ var offset int
+ for {
+ n, err := unix.Read(s.fd, bs[offset:])
+ if err != nil {
+ s.mu.Lock()
+ closed := s.closed
+ s.mu.Unlock()
+ if closed {
+ break
+ }
+ panic(err)
+ }
+ nRead := s.handleMsg(bs[:offset+n])
+ offset = copy(bs[:], bs[nRead:offset+n])
+ }
+}
+
+func (s *session) handleMsg(bs []byte) (nRead int) {
+ expectedLen := 1
+ if len(bs) < expectedLen {
+ 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 {
+ 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)
+ nRead = len(bs)
+ return
+ }
+ expectedLen += ippLen
+ hasMsgCRC := ippType&0x80 != 0
+ if hasMsgCRC {
+ expectedLen += 4
+ }
+ if len(bs) < expectedLen {
+ return
+ }
+ nRead = expectedLen
+ ippData := bs[7 : 7+ippLen]
+ if hasMsgCRC {
+ msgCRC := binary.LittleEndian.Uint32(bs[7+ippLen : 7+ippLen+4])
+ expectedMsgCRC := ^crc32.ChecksumIEEE(ippData)
+ if msgCRC != expectedMsgCRC {
+ log.Printf("skipping IPP message %02x, expected crc32 %08x got %08x", expectedMsgCRC, msgCRC)
+ return
+ }
+ }
+ var ellipsis string
+ if ippLen > 0 {
+ ellipsis = "..."
+ }
+ log.Printf("%s < %s%s%s", s.path, hex.EncodeToString(bs[:7]), ellipsis, hex.EncodeToString(bs[7+ippLen:expectedLen]))
+ if s.handler != nil {
+ s.handler(ippType, ippData)
+ }
+ return
+}
+
+func (s *session) Close() error {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ s.closed = true
+ return unix.Close(s.fd)
+}
+
+func (s *session) Write(bs []byte) (int, error) {
+ log.Printf("%s > %s", s.path, hex.EncodeToString(bs))
+ return unix.Write(s.fd, bs)
+}
+
+func (s *session) SendIPP(ippType byte, ippData []byte) error {
+ s.mu.Lock()
+ s.nextSeqOut++
+ if s.nextSeqOut == 0 {
+ s.nextSeqOut++
+ }
+ seq := s.nextSeqOut
+ s.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("%s > %s%s%s", s.path, hex.EncodeToString(ippHdr), hex.EncodeToString(ippData), hex.EncodeToString(msgCRC))
+ if _, err := unix.Writev(s.fd, [][]byte{ippHdr, ippData, msgCRC}); err != nil {
+ return err
+ }
+ return nil
+}
diff --git a/pic32/pic32.go b/pic32/pic32.go
new file mode 100644
index 0000000..8150ab3
--- /dev/null
+++ b/pic32/pic32.go
@@ -0,0 +1,21 @@
+package pic32
+
+import (
+ "encoding/hex"
+ "log"
+
+ "pm3.dev/ipp"
+)
+
+const Path = "/dev/ttymxc2"
+
+func OpenIPP(handler ipp.Handler) (ipp.Session, error) {
+ return ipp.Open(Path, handler)
+}
+
+func LogIPP(msgType byte, msgData []byte) {
+ switch msgType {
+ default:
+ log.Printf("ipp %02x\n%s", msgType, hex.Dump(msgData))
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2026-03-21 22:47:49 +0000