I'm working with a soundcard and I'm trying to implement the isochronous
write function (libusb-win32 backend). It's not pretty, but here's what I
have so far.
# def iso_write(self, dev_handle, ep, intf, data, timeout):
# pass
# int usb_isochronous_setup_async(usb_dev_handle *dev, void **context,
unsigned char ep, int pktsize);
# int usb_submit_async(void *context, char *bytes, int size);
@methodtrace(_logger)
def iso_write(self, dev_handle, ep, intf, data, epsize,timeout):
r0 = c_void_p()
request0 = pointer(r0)
data_cnt0=0
address, buffersize = data.buffer_info()
buffersize *= data.itemsize
#setup works
print _lib.usb_isochronous_setup_async(dev_handle,request0, ep,epsize)
#submit fails
return int(_check(_lib.usb_submit_async(r0,
cast(address, c_char_p),
buffersize)))
for x in range(0,10):
data_cnt0 = _lib.usb_reap_async(request0,5000)
_lib.usb_submit_async(r0,
cast(address, c_char_p),
buffersize)
print data_cnt0
This produces the following error.
USBError: [Errno None] libusb0-dll:err [submit-async] submitting request
failed, win error: The parameter is incorrect.
It looks like it's in reference to the cast(address,c_char_p) parameter,
Could it be the pointer?
Any ideas as to what I'm doing wrong here?
Is there publicly available experimental code for libusb-win32 iso_write?
Thanks,
Spencer
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