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Copy pathjdusbproto.py
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265 lines (224 loc) · 8 KB
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import struct
import time
import serial
import serial.threaded
import socket
import typing
import threading
import sys
def read16(arr:bytes, off = 0) -> int:
return struct.unpack_from("<H", arr, offset=off)[0]
def read32(arr:bytes, off = 0) -> int:
return struct.unpack_from("<I", arr, offset=off)[0]
def debug(m:str):
print(m)
JD_DEVICE_IDENTIFIER_BROADCAST_HIGH_MARK = 0xaaaaaaaa
JD_FRAME_FLAG_IDENTIFIER_IS_SERVICE_CLASS = 0x04
JD_FRAME_FLAG_LOOPBACK = 0x40
JD_SERVICE_INDEX_BROADCAST = 0x3d
SRV_USB_BRIDGE = 0x18f61a4a
JD_FRAME_FLAG_COMMAND = 0x01
def const(x): return x
class UsbBridgeQByte:
MAGIC = const(0xfe)
LITERAL_MAGIC = const(0xf8)
RESERVED = const(0xf9)
SERIAL_GAP = const(0xfa)
FRAME_GAP = const(0xfb)
FRAME_START = const(0xfc)
FRAME_END = const(0xfd)
JD_USB_BRIDGE_CMD_DISABLE_PACKETS = const(0x80)
JD_USB_BRIDGE_CMD_ENABLE_PACKETS = const(0x81)
JD_USB_BRIDGE_CMD_DISABLE_LOG = const(0x82)
JD_USB_BRIDGE_CMD_ENABLE_LOG = const(0x83)
def crc(buf: bytes, start: int = 0, end: int = 100000):
if end > len(buf):
end = len(buf)
crc = 0xffff
while start < end:
data = buf[start]
start += 1
x = (crc >> 8) ^ data
x ^= x >> 4
crc = ((crc << 8) ^ (x << 12) ^ (x << 5) ^ x) & 0xffff
return crc
class JdUsbProto(serial.threaded.Protocol):
def __init__(self, ser):
self.usb_rx_was_magic = 0
self.usb_rx_state = 0
self.usb_rx_ptr = 0
self.rxbuf = bytearray(256)
self.numFrames = 0
self.socket: typing.Optional[socket.socket] = None
self.ser = ser
def __call__(self):
return self
def connection_made(self, transport):
def connect():
for i in range(100):
self.send_frame(
self.processingPkt(JD_USB_BRIDGE_CMD_ENABLE_PACKETS)
)
self.send_frame(
self.processingPkt(JD_USB_BRIDGE_CMD_ENABLE_LOG)
)
time.sleep(0.3)
if self.numFrames > 0: break
self.log("waiting for response %d..." % i)
self.log("connected")
self.th = threading.Thread(target=connect)
self.th.start()
def data_received(self, data):
self.decodeFrame(data)
def connection_lost(self, exc):
print("conn lost")
if isinstance(exc, Exception):
raise exc
def logError(self, msg: str):
print("JDUSB Error: " + msg)
def log(self, msg: str):
print("log: " + msg)
def handleProcessingFrame(self, fr: bytes):
cmd = read16(fr, 14)
self.log("processing frame: 0x%x" % cmd)
def frameHandler(self, fr: bytes):
if self.socket is not None:
self.socket.sendall(bytes([len(fr)]) + fr)
def handleFrame(self, fr: bytes):
self.numFrames += 1
sz = fr[2] + 12
if len(fr) < 4 or len(fr) < sz:
self.logError("short frm")
return
fr = fr[0:sz]
c = crc(fr[2:])
if read16(fr, 0) != c:
self.logError("crc err")
return
if (fr[3] & JD_FRAME_FLAG_IDENTIFIER_IS_SERVICE_CLASS) != 0 and \
read32(fr, 4) == SRV_USB_BRIDGE:
self.handleProcessingFrame(fr)
else:
self.frameHandler(fr)
def decodeFrame(self, buf: bytes):
serialBuf: list[int] = []
def jd_usb_serial_cb(c: int):
serialBuf.append(c)
def frame_error():
# break out of frame state
self.usb_rx_state = 0
# pass on accumulated data as serial
for j in range(self.usb_rx_ptr):
jd_usb_serial_cb(self.rxbuf[j])
self.usb_rx_ptr = 0
for i in range(len(buf)):
c = buf[i]
if self.usb_rx_was_magic:
if c == UsbBridgeQByte.MAGIC:
if self.usb_rx_state:
self.logError("dual magic")
frame_error()
continue
# 'c' will be passed to jd_usb_serial_cb() below
else:
self.usb_rx_was_magic = 0
if (c == UsbBridgeQByte.LITERAL_MAGIC):
c = UsbBridgeQByte.MAGIC
elif c == UsbBridgeQByte.FRAME_START:
if (self.usb_rx_ptr):
self.logError("second begin")
frame_error()
self.usb_rx_state = c
continue
elif c == UsbBridgeQByte.FRAME_END:
if self.usb_rx_state:
self.usb_rx_state = 0
fr = self.rxbuf[0: self.usb_rx_ptr]
self.handleFrame(fr)
self.usb_rx_ptr = 0
else:
self.logError("mismatched stop")
continue
elif c == UsbBridgeQByte.SERIAL_GAP:
if len(serialBuf) > 0:
self.onSerial(bytes(serialBuf), False)
serialBuf = []
self.onSerialGap()
continue
elif c == UsbBridgeQByte.FRAME_GAP:
self.onFrameGap()
continue
elif c == UsbBridgeQByte.RESERVED:
continue # ignore
else:
if self.usb_rx_state:
self.logError("invalid quote")
frame_error()
# either way, pass on directly
jd_usb_serial_cb(UsbBridgeQByte.MAGIC)
# c = c;
elif c == UsbBridgeQByte.MAGIC:
self.usb_rx_was_magic = 1
continue
if self.usb_rx_state:
if self.usb_rx_ptr >= len(self.rxbuf):
self.logError("frame ovf")
frame_error()
else:
self.rxbuf[self.usb_rx_ptr] = c
self.usb_rx_ptr += 1
else:
jd_usb_serial_cb(c)
if len(serialBuf) > 0:
self.onSerial(bytes(serialBuf), False)
def error(self, m: str):
raise ValueError(m)
def processingPkt(self, serviceCommand: int):
f = bytearray( struct.pack("<HBBIIBBH",
0, # crc
4, # _size
JD_FRAME_FLAG_IDENTIFIER_IS_SERVICE_CLASS |
JD_FRAME_FLAG_COMMAND |
JD_FRAME_FLAG_LOOPBACK,
SRV_USB_BRIDGE,
JD_DEVICE_IDENTIFIER_BROADCAST_HIGH_MARK,
0, # service size
JD_SERVICE_INDEX_BROADCAST,
serviceCommand,
))
c = crc(f[2:])
f[0] = c & 0xff
f[1] = c >> 8
return f
def encodeFrame(self, buf: bytes):
c = crc(buf[2:])
if buf[0] + (buf[1] << 8) != c:
raise ValueError("bad crc")
outp: list[int] = []
outp.append(UsbBridgeQByte.MAGIC)
outp.append(UsbBridgeQByte.FRAME_START)
for ptr in range(len(buf)):
b = buf[ptr]
outp.append(b)
if b == UsbBridgeQByte.MAGIC:
outp.append(UsbBridgeQByte.LITERAL_MAGIC)
outp.append(UsbBridgeQByte.MAGIC)
outp.append(UsbBridgeQByte.FRAME_END)
return bytes(outp)
def send_frame(self, fr: bytes):
buf = self.encodeFrame(fr)
self.ser.write(buf)
def flushSerial(self):
pass
def onSerialGap(self):
self.flushSerial()
debug("DEV-S: [...some serial output skipped...]")
def onFrameGap(self):
debug("DEV-S: [...some Jacdac packets skipped...]")
def onSerial(self, data: bytes, iserr: bool):
sys.stdout.buffer.write(data)
sys.stdout.buffer.flush()
def postConnectAsync(self):
pass
def disconnectAsync(self):
pass