RxUsbDeviceGetDescriptor
Description
Executes the Standard Device Request that obtains the Device Descriptor.
Syntax
rc = RxUsbDeviceGetDescriptor(Handle,Length,Descriptor)
Parameters
- Handle
- the Device Handle received from the previous RxUsbOpen.
- Length
- the desired number of bytes or 0 for the whole Device Descriptor.
- Descriptor
- the name of the variable to receive the Device Descriptor.
Return Code
0x0000 - NO_ERROR
Errors
0x0006 - ERROR_INVALID_HANDLE 0x0008 - ERROR_NOT_ENOUGH_MEMORY 0x0057 - ERROR_INVALID_PARAMETER 0x005F - ERROR_INTERRUPT 0x0122 - ERROR_TOO_MANY_HANDLES 0x0280 - ERROR_TIMEOUT 0x1B58 - USB_NOT_INIT 0x4000 - USB_IORB_REQUEST 0x80XX - USB_IORB_FAILED
Remarks
Example Code
/* add RxUsbDeviceGetDescriptor */
rc = RxFuncAdd('RxUsbDeviceGetDescriptor','usbcalls','RxUsbDeviceGetDescriptor')
say '+RxUsbDeviceGetDescriptor(),RC=0x'd2x(rc)
/* invoke RxUsbDeviceGetDescriptor */
Length=18 /* to receive whole descriptor */
drop Descriptor /* receives device descriptor */
rc = RxUsbDeviceGetDescriptor(Handle,Length,Descriptor)
say '*RxUsbDeviceGetDescriptor(),RC=0x'd2x(rc)
/* drop RxUsbDeviceGetDescriptor */
rc = RxFuncDrop('RxUsbDeviceGetDescriptor')
say '-RxUsbDeviceGetDescriptor(),RC=0x'd2x(rc)