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 0xFF0D - ERROR_INVALID_DATA 0xFF13 - ERROR_I24_INVALID_PARAMETER 0xFF13 - USB_IDC_PARMERR 0xFF18 - USB_IDC_ADDRINV 0xFF37 - ERROR_DEV_NOT_EXIST 0xFF5D - EROR_NO_ITEMS 0xFFA7 - ERROR_LOCK_FAILED

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)

Related Functions

 * RxUsbQueryDeviceReport
 * RxUsbConfigurationGetDescriptor
 * RxUsbStringGetDescriptor
 * RxUsbDeviceSetDescriptor
 * RxUsbCtrlMessage
 * RxUsbOpen