Hii,
I am struck with sending the HCI commands to the CYW920719 board . CYW920719 is attached to linux machine it is coming like ttyWICED_HCI_UART10 . Using hci attach i am attaching the device to bluez stack . I am able to get CYW920719 in hci0. Manually i can able to sen the hci commands using hcitool.
I want send the commands using python script. I am using libusb to send the commands. Unable to send the hci commands geting USB pipe error.
Here is my python script:
import usb.core
import usb.util
import subprocess
import logging
class Result(object):
"""Command execution result.
Contains information of executed command by subprocess.
Attributes:
command: command as a string.
exit_status: Integer exit code of the process.
stdout: The output from standard out.
stderr: The output from standard error.
"""
def __init__(self, command, stdout, stderr, exit_status):
self.command = command
self.stdout = stdout
self.stderr = stderr
self.exit_status = exit_status
def __repr__(self😞
return ('Result(command=%r, stdout=%r, stderr=%r, exit_status=%r)'
) % (self.command, self.stdout, self.stderr, self.exit_status)
def run(command, subprocess_input=""😞
""" Executes the commands on shell.
Args:
command: Command to be executed.
subprocess_input: Input to be given for the subprocess
Returns:
True: command line output on success or False otherwise
"""
proc = subprocess.Popen(
command,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
shell=True)
(out, err) = proc.communicate(subprocess_input.encode())
result = Result(
command=command,
stdout=out.decode("utf-8").strip(),
stderr=err.decode("utf-8").strip(),
exit_status=proc.returncode
)
if proc.returncode != 0:
logging.error("ERROR: Command Failed - %s" % result)
return False
return out
def create_hci_command_packet(ogf, ocf, data=()):
""" Prepare the formatted hci command packet
Args:
ogf (int): Opcode Group Field
ocf (int): Opcode Command Field
data (list): Command Parameters
Return:
hci_command_packet (Byte array): on success
False (bool): otherwise
"""
opcode = (((ogf << 10) & 0xffff) | ocf)
byte_str = bytes.fromhex('0' + str(hex(opcode)).strip("0x"))
opcode = bytes([c for t in zip(byte_str[1::2],
byte_str[::2]) for c in t])
packet = bytearray()
[packet.append(itr) for itr in opcode]
packet.append(len(data))
[packet.append(itr) for itr in data]
if packet:
return packet
return False
print(run("sudo hciattach /dev/ttyWICED_HCI_UART11 -t 10 any 115200 noflow nosleep"))
dev = usb.core.find(idVendor=0x04b4, idProduct=0x009b)
print("dev", dev)
#assert dev.ctrl_transfer(0x40, 0x80, 0, 0, msg) == len(msg)
packet = create_hci_command_packet(0x03, 0x0019)
print("packet", packet)
print(dev.ctrl_transfer(0x20, 0, 0, 0, bytes(packet), 1000))
#print(dev.ctrl_transfer(0x20, 0, 0, 0, bytes(packet), 1000))
print(read_endpoint.read(size_or_buffer=10,
timeout=10000))
Result:
b'Device setup complete\n'
dev DEVICE ID 04b4:009b on Bus 002 Address 021 =================
bLength : 0x12 (18 bytes)
bDescriptorType : 0x1 Device
bcdUSB : 0x200 USB 2.0
bDeviceClass : 0x0 Specified at interface
bDeviceSubClass : 0x0
bDeviceProtocol : 0x0
bMaxPacketSize0 : 0x40 (64 bytes)
idVendor : 0x04b4
idProduct : 0x009b
bcdDevice : 0x700 Device 7.0
iManufacturer : 0x1 Cypress
iProduct : 0x2 WICED USB <-> Serial Converter
iSerialNumber : 0x0
bNumConfigurations : 0x1
CONFIGURATION 1: 100 mA ==================================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x2 Configuration
wTotalLength : 0x37 (55 bytes)
bNumInterfaces : 0x2
bConfigurationValue : 0x1
iConfiguration : 0x0
bmAttributes : 0x80 Bus Powered
bMaxPower : 0x32 (100 mA)
INTERFACE 0: Vendor Specific ===========================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x0
bAlternateSetting : 0x0
bNumEndpoints : 0x2
bInterfaceClass : 0xff Vendor Specific
bInterfaceSubClass : 0xff
bInterfaceProtocol : 0xff
iInterface : 0x2 WICED USB <-> Serial Converter
ENDPOINT 0x81: Bulk IN ===============================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x81 IN
bmAttributes : 0x2 Bulk
wMaxPacketSize : 0x200 (512 bytes)
bInterval : 0x0
ENDPOINT 0x2: Bulk OUT ===============================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x2 OUT
bmAttributes : 0x2 Bulk
wMaxPacketSize : 0x200 (512 bytes)
bInterval : 0x0
INTERFACE 1: Vendor Specific ===========================
bLength : 0x9 (9 bytes)
bDescriptorType : 0x4 Interface
bInterfaceNumber : 0x1
bAlternateSetting : 0x0
bNumEndpoints : 0x2
bInterfaceClass : 0xff Vendor Specific
bInterfaceSubClass : 0xff
bInterfaceProtocol : 0xff
iInterface : 0x2 WICED USB <-> Serial Converter
ENDPOINT 0x83: Bulk IN ===============================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x83 IN
bmAttributes : 0x2 Bulk
wMaxPacketSize : 0x200 (512 bytes)
bInterval : 0x0
ENDPOINT 0x4: Bulk OUT ===============================
bLength : 0x7 (7 bytes)
bDescriptorType : 0x5 Endpoint
bEndpointAddress : 0x4 OUT
bmAttributes : 0x2 Bulk
wMaxPacketSize : 0x200 (512 bytes)
bInterval : 0x0
packet bytearray(b'\x19\x0c\x00')
Traceback (most recent call last):
File "Hci_commands.py", line 94, in <module>
print(dev.ctrl_transfer(0x20, 0, 0, 0, bytes(packet), 1000))
File "/home/vijay/.local/lib/python3.5/site-packages/usb/core.py", line 1043, in ctrl_transfer
self.__get_timeout(timeout))
File "/home/vijay/.local/lib/python3.5/site-packages/usb/backend/libusb1.py", line 883, in ctrl_transfer
timeout))
File "/home/vijay/.local/lib/python3.5/site-packages/usb/backend/libusb1.py", line 595, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 32] Pipe error
How to solve the Pipe error.
