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nonNoise / PyMCP2221A

MCP2221 & MCP2221A work in Python.
MIT License
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Failed to open connection #2

Closed PaTPouL closed 5 years ago

PaTPouL commented 5 years ago

HI,

Thanks for this project, I was looking to do something similar.

When I try to run your example I got an error during open session

File "/home/ppoulin/workspace/devops_hw/usbsfp/PyMCP2221A/example/HIDAPItest.py", line 18, in mcp2221a.open_path(hid.enumerate(0x04D8, 0x00DD)[0]["path"]) File "hid.pyx", line 72, in hid.device.open_path OSError: open failed Process finished with exit code 1

I can see my device using dmesg

[ 1961.826122] usb 1-6.4: new full-speed USB device number 9 using xhci_hcd [ 1961.931560] usb 1-6.4: New USB device found, idVendor=04d8, idProduct=00dd [ 1961.931572] usb 1-6.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 1961.931580] usb 1-6.4: Product: MCP2221 USB-I2C/UART Combo [ 1961.931589] usb 1-6.4: Manufacturer: Microchip Technology Inc. [ 1961.933515] cdc_acm 1-6.4:1.0: ttyACM0: USB ACM device [ 1961.941140] hid-generic 0003:04D8:00DD.0006: hiddev0,hidraw3: USB HID v1.11 Device [Microchip Technology Inc. MCP2221 USB-I2C/UART Combo] on usb-0000:00:14.0-6.4/input2

Maybe it's related to my lib import, I was not able to import hidapi I try pip install hidapi

ppoulin@ppoulin-ThinkPad-T460:~$ pip install hidapi Collecting hidapi Collecting setuptools>=19.0 (from hidapi) Using cached https://files.pythonhosted.org/packages/37/06/754589caf971b0d2d48f151c2586f62902d93dc908e2fd9b9b9f6aa3c9dd/setuptools-40.6.3-py2.py3-none-any.whl Installing collected packages: setuptools, hidapi Successfully installed hidapi-0.7.99.post21 setuptools-40.6.3

But When I try to import in python I got an error

ppoulin@ppoulin-ThinkPad-T460:~$ python Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.

import hidapi Traceback (most recent call last): File "", line 1, in ImportError: No module named hidapi

That's why I use import hid instead import hidapi. I try with python 2 and python 3 but I got the same result.

Maybe I forgot something during your package installation.

Thanks again for your help,

PaTPouL

from lsusb -v

Bus 001 Device 009: ID 04d8:00dd Microchip Technology, Inc. Couldn't open device, some information will be missing Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 ? bDeviceProtocol 1 Interface Association bMaxPacketSize0 8 idVendor 0x04d8 Microchip Technology, Inc. idProduct 0x00dd bcdDevice 1.00 iManufacturer 1 iProduct 2 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 107 bNumInterfaces 3 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 100mA Interface Association: bLength 8 bDescriptorType 11 bFirstInterface 0 bInterfaceCount 2 bFunctionClass 2 Communications bFunctionSubClass 2 Abstract (modem) bFunctionProtocol 1 AT-commands (v.25ter) iFunction 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 2 Communications bInterfaceSubClass 2 Abstract (modem) bInterfaceProtocol 1 AT-commands (v.25ter) iInterface 0 CDC Header: bcdCDC 1.10 CDC ACM: bmCapabilities 0x02 line coding and serial state CDC Union: bMasterInterface 0 bSlaveInterface 1 CDC Call Management: bmCapabilities 0x00 bDataInterface 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 2 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0010 1x 16 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0010 1x 16 bytes bInterval 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.11 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 28 Report Descriptors: UNAVAILABLE Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 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 0x03 EP 3 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1

nonNoise commented 5 years ago

Hi This library use hidapi. https://github.com/trezor/cython-hidapi

You try Build from source Install. Thank you.

eN0Rm commented 5 years ago

I made it work by running as root. 

user@computer:~$ sudo -i 
root@computer:~# cd /PyMCP2221A/
root@computer:/PyMCP2221A# ls
MCP2221_i2cdetect.py  venv
root@computer:/PyMCP2221A# source venv/bin/activate
(venv) root@computer:/PyMCP2221A# python MCP2221_i2cdetect.py 
--------------------------------------------------
MCP2221(A) i2cdetect 
--------------------------------------------------
Reset
   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F  
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   0F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   1F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   2F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   3F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   4F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   5F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --   6F
  --  --  --  --  --  --  --  --  --  --  --  --  --  --  --
(venv) root@computer:/PyMCP2221A#
nonNoise commented 5 years ago

Thank you!! As another way.......... There is also a technique of putting compiled binary data in the folder of PyMCP 2221A, but I can not recommend it. I'm looking for a good way.