Re: [pyusb-users] PyUSB : used for bulk

[Wander L. C. <wan...@gm...>]

2012/5/29 Prince Arnaud RAMAHEFA-ANDRY <pri...@gm...>:
> Hello,
>
> I've make this test on PyUSB to recover the data sent of the microcontroller
> :
>
>>import time
>>import usb.util
>>import usb.backend
>>import os
>>import sys
>>from usb import *
>>import ctypes
>>from ctypes import c_ubyte
>
>>import time
>
>
>>ep_write=0x01
>>ep_read = 0x81
>
>
>># find our device
>>dev = usb.core.find(idVendor=0x04D8, idProduct=0x0204)
>
>># was it found?
>>if dev is None:
>>    raise ValueError('Device not found')
>
>># set the active configuration. With no arguments, the first
>># configuration will be the active one
>>dev.set_configuration()
>
>># get an endpoint instance
>>cfg = dev.get_active_configuration()
>
>>d1 = time.time()
>
>>while i<10000:
>>    dev.write(ep_write, [0], 0, 18)
>>    data = dev.read(ep_read, 64, 0, 18)
>>    i = i+1
>
>>d2 = time.time()
>>print d2-d1
>
> and I have :
>     >pythonw -u "py_libusb.py"
> 20.8320000172
>>Exit code: 0
>

try something like this:

ep_write = usb.util.find(cfg[0,0], bEndpointAddress = 0x01)
ep_read = usb.util.find(cfg[0,0], bEndpointAddress = 0x81)

while i<500:
    ep_write.write([0], 18)
    data = ep_read.read(1280, 18)
    i = i+1

-- 
Best Regards,
Wander Lairson Costa