ValueError: Invalid endpoint address 0x1

[ghosty-be]

Tried on Linux Mint 20.3 and 21 (debian - ubuntu based):
installed python3-usb through apt, python3-pil was already installed by default.
copied the udev rule and reloaded
Device: NB1144
tried running with and without sudo, even directly as root.

When I try the example I get the following error:
./led-badge-11x44.py "Hello"
using [wch.cn CH583] bus=5 dev=10
Type: 11x44
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/usb/core.py", line 223, in get_interface_and_endpoint
return self._ep_info[endpoint_address]
KeyError: 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "./led-badge-11x44.py", line 523, in
dev.write(1, buf[i64:i64+64])
File "/usr/lib/python3/dist-packages/usb/core.py", line 940, in write
intf, ep = self._ctx.setup_request(self, endpoint)
File "/usr/lib/python3/dist-packages/usb/core.py", line 102, in wrapper
return f(self, *args, **kwargs)
File "/usr/lib/python3/dist-packages/usb/core.py", line 215, in setup_request
intf, ep = self.get_interface_and_endpoint(device, endpoint_address)
File "/usr/lib/python3/dist-packages/usb/core.py", line 102, in wrapper
return f(self, *args, **kwargs)
File "/usr/lib/python3/dist-packages/usb/core.py", line 231, in get_interface_and_endpoint
raise ValueError('Invalid endpoint address ' + hex(endpoint_address))
ValueError: Invalid endpoint address 0x1

[ghosty-be]

ok looking through this:
python-escpos/python-escpos#384
I figured doing this:
$ lsusb -v -d 0416:5020

Bus 005 Device 006: ID 0416:5020 Winbond Electronics Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0416 Winbond Electronics Corp.
idProduct 0x5020
bcdDevice 0.00
iManufacturer 1 wch.cn
iProduct 2 CH583
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0029
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 (error)
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 70mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 5 (error)
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 34
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x0000
(Bus Powered)

which shows the OUT endpoint = 0x02 or 2 ...
so I changed this:

$ diff led-badge-11x44.py led-badge-11x44.py.orig 
523c523
<     dev.write(2, buf[i*64:i*64+64])
---
>     dev.write(1, buf[i*64:i*64+64])

And that appears to work as designed...

[ghosty-be]

according to this:
https://github.com/pyusb/pyusb/blob/master/docs/tutorial.rst
this looks like a better idea, to detect the endpoint, rather than hard code it?

$ diff led-badge-11x44.py led-badge-11x44.py.orig 
521,530d520
<   cfg = dev.get_active_configuration()
<   intf = cfg[(0,0)]
< 
<   ep = usb.util.find_descriptor(
<       intf,
<       # match the first OUT endpoint
<       custom_match = \
<       lambda e: \
<           usb.util.endpoint_direction(e.bEndpointAddress) == \
<           usb.util.ENDPOINT_OUT)
533,534c523
<     #dev.write(2, buf[i*64:i*64+64])
<     ep.write(buf[i*64:i*64+64])
---
>     dev.write(1, buf[i*64:i*64+64])

[ids93216]

I have same problem here, after editing dev.write, it works! Thank you

[KaeTuuN]

@ghosty-be Maybe you can make a PR for that so @jnweiger may merge it! :-)

[dirkhillbrecht]

I'd like to stress that this patch fixes the described issue for the usb.core code path on Linux. However, newer versions of the hardware do not seem to work with this approach generally any more, even with the fix. You need to switch to pyhidapi access and apply a fix to make it working again. Pull Request pending.

[azrdev]

PR: #42

[sarduri]

Changeing Line in led-badge-11x44.py to
dev.write(2, buf[i * 64:i * 64 + 64])
Worked for me. But only once. Then I have to desconnect the device and reconnect it again. Is there a way to avoid this behavior? I want to use it as a simple display for the desktop. (Linux Ubuntu)

[jnweiger]

#42 is merged.

[bensartori]

The point with the endpoint number is closely connected to #37, because these devices seem to use Endpoint 2 instead of 1. They also use another USB-to-serial chip. My idea is to automatically use the only endpoint available, instead of a fixed one. I'l try to implement this somewhen in the next weeks (cannot promise...)

[bensartori]

Hello ghost.be, oh, I have overseen that you already did a patch as proposal. I'll try it soon.

[fcartegnie]

Libusbhid does not seem to set-up easily

I have a simpler workaround for now, without hardcoding
see fossasia@ae7195e