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u-boot/common/usb_kbd.c
Thomas Abraham 1eb734fed3 usb : usb_kbd : Populating 'priv' member of USB keyboard device_t structure 
This patch populates the 'priv' field of the USB keyboard device_t
structure. The 'priv' field is populated with the address of the
'struct usb_device' structure that represents the USB device.

The 'priv' field can then be used in the 'usb_event_poll' function to
determine the USB device that requires to be polled. An
example of its usage in 'usb_event_poll' function is as below.

	device_t *dev;
	struct usb_device *usb_kbd_dev;

	<snip>

	dev = device_get_by_name("usbkbd");
	usb_kbd_dev = (struct usb_device *)dev->priv;
	iface = &usb_kbd_dev->config.if_desc[0];

Signed-off-by: Thomas Abraham <t-abraham@ti.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>
2009-01-28 19:57:28 +01:00

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/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland
*
* Part of this source has been derived from the Linux USB
* project.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <devices.h>
#include <asm/byteorder.h>
#include <usb.h>
#undef USB_KBD_DEBUG
/*
* if overwrite_console returns 1, the stdin, stderr and stdout
* are switched to the serial port, else the settings in the
* environment are used
*/
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console (void);
#else
int overwrite_console (void)
{
return (0);
}
#endif
#ifdef USB_KBD_DEBUG
#define USB_KBD_PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define USB_KBD_PRINTF(fmt,args...)
#endif
#define REPEAT_RATE 40/4 /* 40msec -> 25cps */
#define REPEAT_DELAY 10 /* 10 x REAPEAT_RATE = 400msec */
#define NUM_LOCK 0x53
#define CAPS_LOCK 0x39
#define SCROLL_LOCK 0x47
/* Modifier bits */
#define LEFT_CNTR 0
#define LEFT_SHIFT 1
#define LEFT_ALT 2
#define LEFT_GUI 3
#define RIGHT_CNTR 4
#define RIGHT_SHIFT 5
#define RIGHT_ALT 6
#define RIGHT_GUI 7
#define USB_KBD_BUFFER_LEN 0x20 /* size of the keyboardbuffer */
static volatile char usb_kbd_buffer[USB_KBD_BUFFER_LEN];
static volatile int usb_in_pointer = 0;
static volatile int usb_out_pointer = 0;
unsigned char new[8];
unsigned char old[8];
int repeat_delay;
#define DEVNAME "usbkbd"
static unsigned char num_lock = 0;
static unsigned char caps_lock = 0;
static unsigned char scroll_lock = 0;
static unsigned char ctrl = 0;
static unsigned char leds __attribute__ ((aligned (0x4)));
static unsigned char usb_kbd_numkey[] = {
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0','\r',0x1b,'\b','\t',' ', '-',
'=', '[', ']','\\', '#', ';', '\'', '`', ',', '.', '/'
};
static unsigned char usb_kbd_numkey_shifted[] = {
'!', '@', '#', '$', '%', '^', '&', '*', '(', ')','\r',0x1b,'\b','\t',' ', '_',
'+', '{', '}', '|', '~', ':', '"', '~', '<', '>', '?'
};
/******************************************************************
* Queue handling
******************************************************************/
/* puts character in the queue and sets up the in and out pointer */
static void usb_kbd_put_queue(char data)
{
if((usb_in_pointer+1)==USB_KBD_BUFFER_LEN) {
if(usb_out_pointer==0) {
return; /* buffer full */
} else{
usb_in_pointer=0;
}
} else {
if((usb_in_pointer+1)==usb_out_pointer)
return; /* buffer full */
usb_in_pointer++;
}
usb_kbd_buffer[usb_in_pointer]=data;
return;
}
/* test if a character is in the queue */
static int usb_kbd_testc(void)
{
#ifdef CONFIG_SYS_USB_EVENT_POLL
usb_event_poll();
#endif
if(usb_in_pointer==usb_out_pointer)
return(0); /* no data */
else
return(1);
}
/* gets the character from the queue */
static int usb_kbd_getc(void)
{
char c;
while(usb_in_pointer==usb_out_pointer) {
#ifdef CONFIG_SYS_USB_EVENT_POLL
usb_event_poll();
#endif
}
if((usb_out_pointer+1)==USB_KBD_BUFFER_LEN)
usb_out_pointer=0;
else
usb_out_pointer++;
c=usb_kbd_buffer[usb_out_pointer];
return (int)c;
}
/* forward decleration */
static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum);
/* search for keyboard and register it if found */
int drv_usb_kbd_init(void)
{
int error,i;
device_t usb_kbd_dev,*old_dev;
struct usb_device *dev;
char *stdinname = getenv ("stdin");
usb_in_pointer=0;
usb_out_pointer=0;
/* scan all USB Devices */
for(i=0;i<USB_MAX_DEVICE;i++) {
dev=usb_get_dev_index(i); /* get device */
if(dev == NULL)
return -1;
if(dev->devnum!=-1) {
if(usb_kbd_probe(dev,0)==1) { /* Ok, we found a keyboard */
/* check, if it is already registered */
USB_KBD_PRINTF("USB KBD found set up device.\n");
old_dev = device_get_by_name(DEVNAME);
if(old_dev) {
/* ok, already registered, just return ok */
USB_KBD_PRINTF("USB KBD is already registered.\n");
return 1;
}
/* register the keyboard */
USB_KBD_PRINTF("USB KBD register.\n");
memset (&usb_kbd_dev, 0, sizeof(device_t));
strcpy(usb_kbd_dev.name, DEVNAME);
usb_kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
usb_kbd_dev.putc = NULL;
usb_kbd_dev.puts = NULL;
usb_kbd_dev.getc = usb_kbd_getc;
usb_kbd_dev.tstc = usb_kbd_testc;
usb_kbd_dev.priv = (void *)dev;
error = device_register (&usb_kbd_dev);
if(error==0) {
/* check if this is the standard input device */
if(strcmp(stdinname,DEVNAME)==0) {
/* reassign the console */
if(overwrite_console()) {
return 1;
}
error=console_assign(stdin,DEVNAME);
if(error==0)
return 1;
else
return error;
}
return 1;
}
return error;
}
}
}
/* no USB Keyboard found */
return -1;
}
/* deregistering the keyboard */
int usb_kbd_deregister(void)
{
#ifdef CONFIG_SYS_DEVICE_DEREGISTER
return device_deregister(DEVNAME);
#else
return 1;
#endif
}
/**************************************************************************
* Low Level drivers
*/
/* set the LEDs. Since this is used in the irq routine, the control job
is issued with a timeout of 0. This means, that the job is queued without
waiting for job completion */
static void usb_kbd_setled(struct usb_device *dev)
{
struct usb_interface_descriptor *iface;
iface = &dev->config.if_desc[0];
leds=0;
if(scroll_lock!=0)
leds|=1;
leds<<=1;
if(caps_lock!=0)
leds|=1;
leds<<=1;
if(num_lock!=0)
leds|=1;
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0x200, iface->bInterfaceNumber,(void *)&leds, 1, 0);
}
#define CAPITAL_MASK 0x20
/* Translate the scancode in ASCII */
static int usb_kbd_translate(unsigned char scancode,unsigned char modifier,int pressed)
{
unsigned char keycode;
if(pressed==0) {
/* key released */
repeat_delay=0;
return 0;
}
if(pressed==2) {
repeat_delay++;
if(repeat_delay<REPEAT_DELAY)
return 0;
repeat_delay=REPEAT_DELAY;
}
keycode=0;
if((scancode>3) && (scancode<=0x1d)) { /* alpha numeric values */
keycode=scancode-4 + 0x61;
if(caps_lock)
keycode&=~CAPITAL_MASK; /* switch to capital Letters */
if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) {
if(keycode & CAPITAL_MASK)
keycode&=~CAPITAL_MASK; /* switch to capital Letters */
else
keycode|=CAPITAL_MASK; /* switch to non capital Letters */
}
}
if((scancode>0x1d) && (scancode<0x3A)) {
if(((modifier&(1<<LEFT_SHIFT))!=0)||((modifier&(1<<RIGHT_SHIFT))!=0)) /* shifted */
keycode=usb_kbd_numkey_shifted[scancode-0x1e];
else /* non shifted */
keycode=usb_kbd_numkey[scancode-0x1e];
}
if (ctrl)
keycode = scancode - 0x3;
if(pressed==1) {
if(scancode==NUM_LOCK) {
num_lock=~num_lock;
return 1;
}
if(scancode==CAPS_LOCK) {
caps_lock=~caps_lock;
return 1;
}
if(scancode==SCROLL_LOCK) {
scroll_lock=~scroll_lock;
return 1;
}
}
if(keycode!=0) {
USB_KBD_PRINTF("%c",keycode);
usb_kbd_put_queue(keycode);
}
return 0;
}
/* Interrupt service routine */
static int usb_kbd_irq(struct usb_device *dev)
{
int i,res;
if((dev->irq_status!=0)||(dev->irq_act_len!=8))
{
USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
return 1;
}
res=0;
switch (new[0]) {
case 0x0: /* No combo key pressed */
ctrl = 0;
break;
case 0x01: /* Left Ctrl pressed */
case 0x10: /* Right Ctrl pressed */
ctrl = 1;
break;
}
for (i = 2; i < 8; i++) {
if (old[i] > 3 && memscan(&new[2], old[i], 6) == &new[8]) {
res|=usb_kbd_translate(old[i],new[0],0);
}
if (new[i] > 3 && memscan(&old[2], new[i], 6) == &old[8]) {
res|=usb_kbd_translate(new[i],new[0],1);
}
}
if((new[2]>3) && (old[2]==new[2])) /* still pressed */
res|=usb_kbd_translate(new[2],new[0],2);
if(res==1)
usb_kbd_setled(dev);
memcpy(&old[0],&new[0], 8);
return 1; /* install IRQ Handler again */
}
/* probes the USB device dev for keyboard type */
static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
{
struct usb_interface_descriptor *iface;
struct usb_endpoint_descriptor *ep;
int pipe,maxp;
if (dev->descriptor.bNumConfigurations != 1) return 0;
iface = &dev->config.if_desc[ifnum];
if (iface->bInterfaceClass != 3) return 0;
if (iface->bInterfaceSubClass != 1) return 0;
if (iface->bInterfaceProtocol != 1) return 0;
if (iface->bNumEndpoints != 1) return 0;
ep = &iface->ep_desc[0];
if (!(ep->bEndpointAddress & 0x80)) return 0;
if ((ep->bmAttributes & 3) != 3) return 0;
USB_KBD_PRINTF("USB KBD found set protocol...\n");
/* ok, we found a USB Keyboard, install it */
/* usb_kbd_get_hid_desc(dev); */
usb_set_protocol(dev, iface->bInterfaceNumber, 0);
USB_KBD_PRINTF("USB KBD found set idle...\n");
usb_set_idle(dev, iface->bInterfaceNumber, REPEAT_RATE, 0);
memset(&new[0], 0, 8);
memset(&old[0], 0, 8);
repeat_delay=0;
pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
maxp = usb_maxpacket(dev, pipe);
dev->irq_handle=usb_kbd_irq;
USB_KBD_PRINTF("USB KBD enable interrupt pipe...\n");
usb_submit_int_msg(dev,pipe,&new[0], maxp > 8 ? 8 : maxp,ep->bInterval);
return 1;
}
#if 0
struct usb_hid_descriptor {
unsigned char bLength;
unsigned char bDescriptorType; /* 0x21 for HID */
unsigned short bcdHID; /* release number */
unsigned char bCountryCode;
unsigned char bNumDescriptors;
unsigned char bReportDescriptorType;
unsigned short wDescriptorLength;
} __attribute__ ((packed));
/*
* We parse each description item into this structure. Short items data
* values are expanded to 32-bit signed int, long items contain a pointer
* into the data area.
*/
struct hid_item {
unsigned char format;
unsigned char size;
unsigned char type;
unsigned char tag;
union {
unsigned char u8;
char s8;
unsigned short u16;
short s16;
unsigned long u32;
long s32;
unsigned char *longdata;
} data;
};
/*
* HID report item format
*/
#define HID_ITEM_FORMAT_SHORT 0
#define HID_ITEM_FORMAT_LONG 1
/*
* Special tag indicating long items
*/
#define HID_ITEM_TAG_LONG 15
static struct usb_hid_descriptor usb_kbd_hid_desc;
void usb_kbd_display_hid(struct usb_hid_descriptor *hid)
{
printf("USB_HID_DESC:\n");
printf(" bLenght 0x%x\n",hid->bLength);
printf(" bcdHID 0x%x\n",hid->bcdHID);
printf(" bCountryCode %d\n",hid->bCountryCode);
printf(" bNumDescriptors 0x%x\n",hid->bNumDescriptors);
printf(" bReportDescriptorType 0x%x\n",hid->bReportDescriptorType);
printf(" wDescriptorLength 0x%x\n",hid->wDescriptorLength);
}
/*
* Fetch a report description item from the data stream. We support long
* items, though they are not used yet.
*/
static int fetch_item(unsigned char *start,unsigned char *end, struct hid_item *item)
{
if((end - start) > 0) {
unsigned char b = *start++;
item->type = (b >> 2) & 3;
item->tag = (b >> 4) & 15;
if (item->tag == HID_ITEM_TAG_LONG) {
item->format = HID_ITEM_FORMAT_LONG;
if ((end - start) >= 2) {
item->size = *start++;
item->tag = *start++;
if ((end - start) >= item->size) {
item->data.longdata = start;
start += item->size;
return item->size;
}
}
} else {
item->format = HID_ITEM_FORMAT_SHORT;
item->size = b & 3;
switch (item->size) {
case 0:
return item->size;
case 1:
if ((end - start) >= 1) {
item->data.u8 = *start++;
return item->size;
}
break;
case 2:
if ((end - start) >= 2) {
item->data.u16 = le16_to_cpu((unsigned short *)start);
start+=2;
return item->size;
}
case 3:
item->size++;
if ((end - start) >= 4) {
item->data.u32 = le32_to_cpu((unsigned long *)start);
start+=4;
return item->size;
}
}
}
}
return -1;
}
/*
* HID report descriptor item type (prefix bit 2,3)
*/
#define HID_ITEM_TYPE_MAIN 0
#define HID_ITEM_TYPE_GLOBAL 1
#define HID_ITEM_TYPE_LOCAL 2
#define HID_ITEM_TYPE_RESERVED 3
/*
* HID report descriptor main item tags
*/
#define HID_MAIN_ITEM_TAG_INPUT 8
#define HID_MAIN_ITEM_TAG_OUTPUT 9
#define HID_MAIN_ITEM_TAG_FEATURE 11
#define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION 10
#define HID_MAIN_ITEM_TAG_END_COLLECTION 12
/*
* HID report descriptor main item contents
*/
#define HID_MAIN_ITEM_CONSTANT 0x001
#define HID_MAIN_ITEM_VARIABLE 0x002
#define HID_MAIN_ITEM_RELATIVE 0x004
#define HID_MAIN_ITEM_WRAP 0x008
#define HID_MAIN_ITEM_NONLINEAR 0x010
#define HID_MAIN_ITEM_NO_PREFERRED 0x020
#define HID_MAIN_ITEM_NULL_STATE 0x040
#define HID_MAIN_ITEM_VOLATILE 0x080
#define HID_MAIN_ITEM_BUFFERED_BYTE 0x100
/*
* HID report descriptor collection item types
*/
#define HID_COLLECTION_PHYSICAL 0
#define HID_COLLECTION_APPLICATION 1
#define HID_COLLECTION_LOGICAL 2
/*
* HID report descriptor global item tags
*/
#define HID_GLOBAL_ITEM_TAG_USAGE_PAGE 0
#define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM 1
#define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM 2
#define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM 3
#define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM 4
#define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT 5
#define HID_GLOBAL_ITEM_TAG_UNIT 6
#define HID_GLOBAL_ITEM_TAG_REPORT_SIZE 7
#define HID_GLOBAL_ITEM_TAG_REPORT_ID 8
#define HID_GLOBAL_ITEM_TAG_REPORT_COUNT 9
#define HID_GLOBAL_ITEM_TAG_PUSH 10
#define HID_GLOBAL_ITEM_TAG_POP 11
/*
* HID report descriptor local item tags
*/
#define HID_LOCAL_ITEM_TAG_USAGE 0
#define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM 1
#define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM 2
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX 3
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM 4
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM 5
#define HID_LOCAL_ITEM_TAG_STRING_INDEX 7
#define HID_LOCAL_ITEM_TAG_STRING_MINIMUM 8
#define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM 9
#define HID_LOCAL_ITEM_TAG_DELIMITER 10
static void usb_kbd_show_item(struct hid_item *item)
{
switch(item->type) {
case HID_ITEM_TYPE_MAIN:
switch(item->tag) {
case HID_MAIN_ITEM_TAG_INPUT:
printf("Main Input");
break;
case HID_MAIN_ITEM_TAG_OUTPUT:
printf("Main Output");
break;
case HID_MAIN_ITEM_TAG_FEATURE:
printf("Main Feature");
break;
case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
printf("Main Begin Collection");
break;
case HID_MAIN_ITEM_TAG_END_COLLECTION:
printf("Main End Collection");
break;
default:
printf("Main reserved %d",item->tag);
break;
}
break;
case HID_ITEM_TYPE_GLOBAL:
switch(item->tag) {
case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
printf("- Global Usage Page");
break;
case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
printf("- Global Logical Minimum");
break;
case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
printf("- Global Logical Maximum");
break;
case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
printf("- Global physical Minimum");
break;
case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
printf("- Global physical Maximum");
break;
case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
printf("- Global Unit Exponent");
break;
case HID_GLOBAL_ITEM_TAG_UNIT:
printf("- Global Unit");
break;
case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
printf("- Global Report Size");
break;
case HID_GLOBAL_ITEM_TAG_REPORT_ID:
printf("- Global Report ID");
break;
case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
printf("- Global Report Count");
break;
case HID_GLOBAL_ITEM_TAG_PUSH:
printf("- Global Push");
break;
case HID_GLOBAL_ITEM_TAG_POP:
printf("- Global Pop");
break;
default:
printf("- Global reserved %d",item->tag);
break;
}
break;
case HID_ITEM_TYPE_LOCAL:
switch(item->tag) {
case HID_LOCAL_ITEM_TAG_USAGE:
printf("-- Local Usage");
break;
case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
printf("-- Local Usage Minimum");
break;
case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
printf("-- Local Usage Maximum");
break;
case HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX:
printf("-- Local Designator Index");
break;
case HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM:
printf("-- Local Designator Minimum");
break;
case HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM:
printf("-- Local Designator Maximum");
break;
case HID_LOCAL_ITEM_TAG_STRING_INDEX:
printf("-- Local String Index");
break;
case HID_LOCAL_ITEM_TAG_STRING_MINIMUM:
printf("-- Local String Minimum");
break;
case HID_LOCAL_ITEM_TAG_STRING_MAXIMUM:
printf("-- Local String Maximum");
break;
case HID_LOCAL_ITEM_TAG_DELIMITER:
printf("-- Local Delimiter");
break;
default:
printf("-- Local reserved %d",item->tag);
break;
}
break;
default:
printf("--- reserved %d",item->type);
break;
}
switch(item->size) {
case 1:
printf(" %d",item->data.u8);
break;
case 2:
printf(" %d",item->data.u16);
break;
case 4:
printf(" %ld",item->data.u32);
break;
}
printf("\n");
}
static int usb_kbd_get_hid_desc(struct usb_device *dev)
{
unsigned char buffer[256];
struct usb_descriptor_header *head;
struct usb_config_descriptor *config;
int index,len,i;
unsigned char *start, *end;
struct hid_item item;
if(usb_get_configuration_no(dev,&buffer[0],0)==-1)
return -1;
head =(struct usb_descriptor_header *)&buffer[0];
if(head->bDescriptorType!=USB_DT_CONFIG) {
printf(" ERROR: NOT USB_CONFIG_DESC %x\n",head->bDescriptorType);
return -1;
}
index=head->bLength;
config=(struct usb_config_descriptor *)&buffer[0];
len=le16_to_cpu(config->wTotalLength);
/* Ok the first entry must be a configuration entry, now process the others */
head=(struct usb_descriptor_header *)&buffer[index];
while(index+1 < len) {
if(head->bDescriptorType==USB_DT_HID) {
printf("HID desc found\n");
memcpy(&usb_kbd_hid_desc,&buffer[index],buffer[index]);
le16_to_cpus(&usb_kbd_hid_desc.bcdHID);
le16_to_cpus(&usb_kbd_hid_desc.wDescriptorLength);
usb_kbd_display_hid(&usb_kbd_hid_desc);
len=0;
break;
}
index+=head->bLength;
head=(struct usb_descriptor_header *)&buffer[index];
}
if(len>0)
return -1;
len=usb_kbd_hid_desc.wDescriptorLength;
if((index = usb_get_class_descriptor(dev, 0, USB_DT_REPORT, 0, &buffer[0], len)) < 0) {
printf("reading report descriptor failed\n");
return -1;
}
printf(" report descriptor (size %u, read %d)\n", len, index);
start = &buffer[0];
end = &buffer[len];
i=0;
do {
index=fetch_item(start,end,&item);
i+=index;
i++;
if(index>=0)
usb_kbd_show_item(&item);
start+=index;
start++;
} while(index>=0);
}
#endif
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