Hi,
Sorry to bother you again. I am still messing with the second
case/example that I explained in previous emails. On a positive note,
all standard requests work now without any problems.
For your information. I am dealing with USB base station that receives
signals from 'nodes' (sensors). To check that the communication between
the station and node is up, there is a 'short ping' command. The manual
says:
Command byte: 0x02
Command data:
byte 1: node address (MSB)
byte 2: node address (LSB)
Response success:
byte 1: 0x02 (2)
Response fail:
Byte 1: 0x21 (33)
I an trying to this working with the default (control) pipe. I have
switched off the node, so pinging the node should result in response
fail. I have tried many things, among other things the following test code:
<code>
UsbDevice usbDevice = ...;
int nodeAddress = 111; // Given by sensor, cannot change.
byte bmRequestType =
UsbConst.REQUESTTYPE_DIRECTION_IN | UsbConst.REQUESTTYPE_TYPE_VENDOR |
UsbConst.REQUESTTYPE_RECIPIENT_ENDPOINT;
byte bRequest = (byte)0x02; // Command byte.
short wValue = 0;
short wIndex = 0;
UsbControlIrp usbControlIrp =
usbDevice.createUsbControlIrp(bmRequestType, bRequest,
wValue, wIndex);
byte[] data = new byte[2]; // Holds command data.
data[0] = 0; // MSB node number.
data[1] = 111; // LSB node number.
usbControlIrp.setData(data);
usbDevice.syncSubmit(usbControlIrp);
</code>
OUTPUT/RESPONSE (from simple listened attach to usbDevice):
UsbDeviceDataLogger - Number of bytes transferred: 2
UsbDeviceDataLogger - Content of data:
data[0] = 32
data[1] = 0
Whatever I do, I never get the fail response (pretty much always the
same response). The usbControlIrp must be wrong, but I simply do not
understand how to get the command byte and command data to the device
and to get the device responding appropriately. Note again, all standard
requests work perfectly fine.
Thanks again for your help.
--
Andre H. Juffer | Phone: +358-8-553 1161
Biocenter Oulu and | Fax: +358-8-553-1141
Department of Biochemistry | Email: andre.juf...@oulu.fi
University of Oulu, Finland | WWW: www.biochem.oulu.fi/Biocomputing/
StruBioCat | WWW: www.strubiocat.oulu.fi
NordProt | WWW: www.nordprot.org
Triacle Biocomputing | WWW: www.triacle-bc.com
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