Hi there,
i'm trying to use this multi-plug (http://www.nw-s.net/images/sispm.jpg) with
pyusb. I already used it form libusbJava which is based on the libusb from
linux.
As it was no problem for me to get it working in java, i'm struggling with
python. Well, i'm new to python (actually these are my first few lines of code)
but i guessed it is more an pyusb related problem - caused by me.
I hoped i could convert (manually for sure) the code from libusbJava to pyusb,
but it does not work - yet. I attached some lines of code, dmesg output and
lsusb --verbose info, but i don't know if it is necessary. Please can someone
have a look at the controlMsg translation:
Java Code:
int reqtype = 0x21;
// USB_DIR_OUT + USB_TYPE_CLASS +
// USB_RECIP_INTERFACE /*request type*/
int request = 0x09; // writing
byte var = (byte) (3 * plugNumber);
int index = 0;
byte _on = 0x03;
byte _off = 0x00;
switchTo = _on;
byte buffer[] = { var, switchTo };
int timeout = 250;
int size = 2;
if (LibusbJava.usb_control_msg(handle, reqtype, request, (0x03 << 8)
| var, index, buffer, size, timeout) < 0) .....
My pyUsb Translation:
on = 0x03
off = 0x00
timeout = 250
try:
print "Trying to switch"
var = (3 * plugNumber)
reqBuffer = [0] * 2
reqBuffer[0] = var
reqBuffer[1] = off
print "Bytes to write: " + str(reqBuffer)
written = handle.controlMsg(0x21, 0x09, reqBuffer, value=0, index=0,
timeout=250)
print "Bytes written: " + str(written)
except Exception, err:
print >> sys.stderr, err
handle, device = None, None
The code works, no error in dmesg or elsewhere, but nothing happends at the
device - so i guess there is something wrong somewhere. Can i somehow debug the
communication?
Would be nice if someone has some minutes to help me,
Regards,
Henning
What i already can read from the device using pyusb:
python usb3.py
Device: 007
Device class: 0
Device sub class: 0
Device protocol: 0
Max packet size: 8
idVendor: 1204
idProduct: 64787
Device Version: 01.01
Configuration: 1
Total length: 27
selfPowered: 0
remoteWakeup: 0
maxPower: 44
Interface: 0
Alternate Setting: 0
Interface class: 3
Interface sub class: 0
Interface protocol: 0
Plug found!
<usb.Device object at 0x989edc8> 0x4b4L 0xfd13L>
lsusb --verbose gives:
Bus 002 Device 007: ID 04b4:fd13 Cypress Semiconductor Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04b4 Cypress Semiconductor Corp.
idProduct 0xfd13
bcdDevice 1.01
iManufacturer 1 Gembird Electronics
iProduct 2 Gembird Silver Shield PM
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 27
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 150mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
** UNRECOGNIZED: 09 21 10 01 00 01 22 d9 00
Device Status: 0x0000
(Bus Powered)
dmesg at connection:
[23184.808216] usb 2-1: new full speed USB device using uhci_hcd and address 7
[23184.957093] usb 2-1: configuration #1 chosen from 1 choice
[23185.022999] usbhid 2-1:1.0: couldn't find an input interrupt endpoint
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