/* USB Common Descriptor */
typedef  struct _USB_COMMON_DESCRIPTOR {
  BYTE  bLength;
  BYTE  bDescriptorType;
}__attribute__ ((packed)) USB_COMMON_DESCRIPTOR;
эта структура описана в h файле.

USB_COMMON_DESCRIPTOR * pD;
         (BYTE *) pD  +=  ((USB_CONFIGURATION_DESCRIPTOR *)pD)->wTotalLength;

void get_deskriptor(DWORD EP,BYTE zap[]){
LONG lendes,n;
WORD lensen;
BYTE* des,FLAG_PACK = 0;
/* */
lensen = zap[7] & 0xFF;
lensen = (lensen<<8) | (zap[6] & 0xFF);
/* */

switch(zap[3]){
case DEVICE :
{
lendes = sizeof(USB_DeviceDescriptor);
des = (BYTE*) &(USB_DeviceDescriptor[0]);
break;
}
case CONFIGURATION:
{
lendes = sizeof(USB_ConfigurationDeskriptor);
des = (BYTE*) &(USB_ConfigurationDeskriptor[0]);
break;
}
case STRINGDESCRIPTOR:{
lendes = (sizeof(USB_StringDescriptor) - zap[2]);
des = (BYTE*) &(USB_StringDescriptor[zap[2]]);
}
case HIDDESCRIPTOR:{
lendes = sizeof(USB_HidDescriptor);
des = (BYTE*) &(USB_HidDescriptor[0]);
}
case REPORTDESCRIPTOR:{
lendes = sizeof(HID_ReportDescriptor);
des = (BYTE*) &(HID_ReportDescriptor[0]);
}
default:
{
stall(EP);
return;
}
}//end switch
/* --------------------------------------------------------- */
if(lensen > lendes){
if((lendes % 8) == 0 ){FLAG_PACK = 1;}else{FLAG_PACK = 0;}
}else{ lendes = lensen; } //end else
AT91C_BASE_UDP->UDP_CSR[EP] |= AT91C_UDP_DIR; // dev-> host


while(lendes > 8){
while(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXPKTRDY){}

for(n = 0; n < 8; n++){
AT91C_BASE_UDP->UDP_FDR[EP] = *(des++);
}//end for
AT91C_BASE_UDP->UDP_CSR[EP] |= AT91C_UDP_TXPKTRDY;
while(!(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXCOMP));
// вот здесь программа зависает, первый раз отправляет 8
// байт с получает подтверждение TXCOMP , во второй раз зависает
// в ожидании TXCOMP

AT91C_BASE_UDP->UDP_CSR[EP] &= ~AT91C_UDP_TXCOMP;
lendes=lendes-8;
}//end while

if(FLAG_PACK == 1){
while(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXPKTRDY){}
AT91C_BASE_UDP->UDP_CSR[EP] |= AT91C_UDP_TXPKTRDY;
while(!(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXCOMP));
AT91C_BASE_UDP->UDP_CSR[EP] &= ~AT91C_UDP_TXCOMP;
}else{
while(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXPKTRDY){}

for(n = 0; n < lendes; n++){
AT91C_BASE_UDP->UDP_FDR[EP] = *(des++);
}//end for
AT91C_BASE_UDP->UDP_CSR[EP] |= AT91C_UDP_TXPKTRDY;
while(!(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXCOMP));
AT91C_BASE_UDP->UDP_CSR[EP] &= ~AT91C_UDP_TXCOMP;

}//end else
AT91C_BASE_UDP->UDP_CSR[EP] &= ~AT91C_UDP_DIR; // host-> dev
}//end get_deskriptor
//-------------------------------------------------------------------------------

while(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXPKTRDY){if( AT91C_BASE_UDP->UDP_ISR & AT91C_UDP_RXSUSP ) return;}

if (AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXCOMP) {
AT91C_BASE_UDP->UDP_CSR[EP] &= ~(AT91C_UDP_TXCOMP);
while (AT91C_BASE_UDP->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}//end if

AT91C_BASE_UDP->UDP_CSR[EP] |= AT91C_UDP_TXPKTRDY;

  while(!(AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_TXCOMP)){
            if (AT91C_BASE_UDP->UDP_CSR[EP] & AT91C_UDP_RX_DATA_BK0) {
                AT91C_BASE_UDP->UDP_CSR[EP] &= ~(AT91C_UDP_RX_DATA_BK0);
                return;
            }//end if
            if (AT91C_BASE_UDP->UDP_ISR & AT91C_UDP_ENDBUSRES){
                 reset_status = 1;
                 return;
            }//end bus reset
      }//end while