[Pyusb-users] Simple pyUSB example...

[J.D. M. <jd...@co...>]

Hi folks,

I was hoping to get a little snippet of code to help me query a USB 
temperature sensor with Python.  I have installed libusb-win32 (v1.12.2) and 
pyusb (v0.4.2).  I can sucessfully enumerate the device.  Here's what it 
looks like:

Device: \\.\libusb0-0008--0x1dfd-0x0002
  Device class: 0
  Device sub class: 0
  Device protocol: 0
  Max packet size: 8
  idVendor: 7677 (0x1dfd)
  idProduct: 2 (0x0002)
  Device Version: 01.10
  Configuration: 1
    Total length: 41
    selfPowered: 0
    remoteWakeup: 0
    maxPower: 200
    Interface: 0
    Alternate Setting: 0
      Interface class: 3
      Interface sub class: 0
      Interface protocol: 0
      Endpoint: 0x81L
        Type: 3
        Max packet size: 16
        Interval: 10
      Endpoint: 0x2L
        Type: 3
        Max packet size: 16
        Interval: 10

I'm more used to working with serial ports than usb so I was hoping for a 
very minimal amount of code to:

1.  Instantiate the device
2.  Write a string ("hello world")
3.  Read the response

I have gotten as far as:

handle = dev.open()
handle.bulkWrite(0x81,"hello world")

but then get an error:  invalid endpoint 0x81

I'm clearly missing some steps or doing something wrong.  Any help would 
be greatly appreciated.

Best Regards,

J.D.