Re: [libusb] Multiple reads result in timeout

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

2013/10/25 Stapelpanda <Li...@st...>:
> The board is running Arch Linux ARM. The relevant source code parts are:
> #### Connecting
> self._ctx = usb1.LibUSBContext()
> self._device = self._ctx.openByVendorIDAndProductID(0xXXXX, 0xXXXX)
> if self._device is None:
>         raise ValueError('Device not found')
>
> # Check for kernel Driver
> self.reattach = False
> if platform.system() == 'Linux' and
> self._device.kernelDriverActive(self._intf):
>         self.reattach = True
>         self._device.detachKernelDriver(self._intf)
>
> # set active configuration (First one is the default one)
> self._device.claimInterface(self._intf)
>

Here, I guess you claiming the interface, but not setting the active
configuration...

> self._eWrite = 0x01 // Interrupt Write Endpoint (Only one available)
> self._eRead = 0x81 // Interrupt Read Endpoint
>
> # Reading
> data = self._device.interruptRead(endpoint=self._eRead,
> length=64,timeout=2000)
>

Shouldn't you first send a command before reading data?

> # Writing
> self._device.interruptWrite(endpoint=self._eWrite,
> data=str(byteArray),timeout=2000)
>
>

I guess the PyUSB you are using is not this [1] PyUSB, right?

[1] http://github.com/walac/pyusb

-- 
Best Regards,
Wander Lairson Costa