Attempt to put CH569 into debug mode

gistfile1.txt

#!/usr/bin/env python3
import sys
import usb.core
import usb.util
from time import sleep

# find our device
dev = usb.core.find(idVendor=0x4348, idProduct=0x55e0)
if not dev:
    print("Could not find device!")
    sys.exit()

dev.set_configuration()

# get an endpoint instance
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]

ep_out = usb.util.find_descriptor(
    intf,
    # match the first OUT endpoint
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_OUT)

ep_in = usb.util.find_descriptor(
    intf,
    # match the first OUT endpoint
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_IN)

assert ep_out is not None
assert ep_in is not None

def to_bytes(bytestr: str):
    return bytes([int('0x' + b, 16) for b in bytestr.split(' ')])

def to_str(bytes):
    return " ".join(["{:02x}".format(b) for b in bytes])

initreq1 = b'\xa1\x12\x00B\x10MCU ISP & WCH.CN'
initreq2 = "a7 02 00 1f 00"
req1 = b'\xa1\x12\x00B\x10MCU ISP & W'
req4 = req2 = "a7 02 00 1f 00"
req3 = "a8 0e 00 07 00 11 bf f9 f7 13 bf f9 ec e5 f2 ff 8f"
req5 = "a2 01 00 01"

for i in range(6):
    ep_out.write(initreq1)
    resp = to_str(ep_in.read(6))
    print(resp)
    assert resp == "a1 00 02 00 69 10"

device_id = "27 7e 3b 26 3b 38 9d dc"

for i in range(4):
    ep_out.write(initreq2)
    resp = to_str(ep_in.read(30))
    print(resp)
    should_be = "a7 00 1a 00 1f 00 11 bf f9 f7 13 bf f9 ec 45 f2 ff 8f 00 02 07 00 " + device_id
    if resp == should_be:
        break

ep_out.write(req1)
sleep(0.004)
resp1 = to_str(ep_in.read(6))
print(str(resp1))
assert resp1.startswith("a1 00 02 00")

ep_out.write(to_bytes(req2))
resp2 = to_str(ep_in.read(30))
print(resp2)
assert resp2.startswith("a7 00 1a 00 1f 00 11 bf f9 f7 13 bf f9 ec")
assert resp2.endswith("f2 ff 8f 00 02 07 00 27 7e 3b 26 3b 38 9d dc")

ep_out.write(to_bytes(req3))
resp3 = to_str(ep_in.read(6, 0))
print(resp3)
assert resp3 == "a8 00 02 00 00 00"
sleep(0.004)

ep_out.write(to_bytes(req4))
resp4 = to_str(ep_in.read(30))
print(resp4)
assert resp4.startswith("a7 00 1a 00 1f 00 11 bf f9 f7 13 bf f9 ec")
assert resp4.endswith("f2 ff 8f 00 02 07 00 27 7e 3b 26 3b 38 9d dc")

ep_out.write(to_bytes(req5))