Open d1ret opened 12 months ago
We do not understand the question. Can you please describe your experience in details? What does it mean: "When I make a request"? Where you see that "URB_FUNCTION_ABORT_PIPE is called"? etc
I have code
import usb.core
import usb.util
from usb.backend import libusb1
from ctypes import c_void_p, c_int
import time
backend = usb.backend.libusb1.get_backend(find_library=lambda x: "libusb-1.0.dll")
backend.lib.libusb_set_option.argtypes = [c_void_p, c_int]
backend.lib.libusb_set_option(backend.ctx, 1)
device = usb.core.find(idVendor=0x25A7, idProduct=0xfa7c, backend=backend)
print(device)
def get_battery():
req = device.ctrl_transfer(bmRequestType=0x21, bRequest=0x09, wValue=0x0308, data_or_wLength=bytes(
b"\x08\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x49"), wIndex=1)
usb.util.dispose_resources(device)
time.sleep(4)
result = device.ctrl_transfer(bmRequestType=0xa1, bRequest=0x01, wValue=0x0308, data_or_wLength=40, wIndex=1)
usb.util.dispose_resources(device)
usb.util.release_interface(device, 0)
print(f"Message received from the mouse: {list(result)}")
if __name__ == '__main__':
get_battery()
When usbdk send request
device.ctrl_transfer(bmRequestType=0x21, bRequest=0x09, wValue=0x0308, data_or_wLength=data, wIndex=1)"
my usb device disconnects from my computer, and connect after request
What you expect this request will do?
I send a request to a usb device to get a battery charge, but I need it to continue working during the request
It looks like the device is not happy with the request and does the internal reset (disconnects from the bus and reconnects again).
When I make a request, the device is disconnected from the computer, "URB_FUNCTION_ABORT_PIPE" is called, followed by an error. Is it normal or not?