File content as of revision 0:632c9925f013:

/*
Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

/*
**************************************************************************************************************
*                                                 NXP USB Host Stack
*
*                                     (c) Copyright 2008, NXP SemiConductors
*                                     (c) Copyright 2008, OnChip  Technologies LLC
*                                                 All Rights Reserved
*
*                                                  www.nxp.com
*                                               www.onchiptech.com
*
* File           : usbhost_lpc17xx.c
* Programmer(s)  : Ravikanth.P
* Version        :
*
**************************************************************************************************************
*/
 
/*
**************************************************************************************************************
*                                            INCLUDE HEADER FILES
**************************************************************************************************************
*/

#include "netCfg.h"
#if NET_USB

#ifdef __cplusplus
extern "C" {
#endif

#include "usbhost_lpc17xx.h"
//#include "UsbEndpoint.h"

/*
**************************************************************************************************************
*                                              GLOBAL VARIABLES
**************************************************************************************************************
*/
int gUSBConnected;

volatile  USB_INT32U   HOST_RhscIntr = 0;         /* Root Hub Status Change interrupt                       */
volatile  USB_INT32U   HOST_WdhIntr  = 0;         /* Semaphore to wait until the TD is submitted            */
volatile  USB_INT08U   HOST_TDControlStatus = 0;
volatile  HCED        *EDCtrl;                    /* Control endpoint descriptor structure                  */
//volatile  HCED        *EDBulkHead;  
//volatile  HCED        *EDBulkIn;                  /* BulkIn endpoint descriptor  structure                  */
//volatile  HCED        *EDBulkOut;                 /* BulkOut endpoint descriptor structure                  */
volatile  HCTD        *TDHead;                    /* Head transfer descriptor structure                     */
volatile  HCTD        *TDTail;                    /* Tail transfer descriptor structure                     */
volatile  HCCA        *Hcca;                      /* Host Controller Communications Area structure          */ 
          USB_INT16U  *TDBufNonVol;               /* Identical to TDBuffer just to reduce compiler warnings */
volatile  USB_INT08U  *TDBuffer;                  /* Current Buffer Pointer of transfer descriptor          */

// USB host structures
// AHB SRAM block 1
#define HOSTBASEADDR 0x2007C000
// reserve memory for the linker
static USB_INT08U HostBuf[0x300] __attribute((section("AHBSRAM1"),aligned))/* __attribute__((at(HOSTBASEADDR)))*/;
/*
**************************************************************************************************************
*                                         DELAY IN MILLI SECONDS
*
* Description: This function provides a delay in milli seconds
*
* Arguments  : delay    The delay required
*
* Returns    : None
*
**************************************************************************************************************
*/

void  Host_DelayMS (USB_INT32U  delay)
{
    volatile  USB_INT32U  i;


    for (i = 0; i < delay; i++) {
        Host_DelayUS(1000);
    }
}

/*
**************************************************************************************************************
*                                         DELAY IN MICRO SECONDS
*
* Description: This function provides a delay in micro seconds
*
* Arguments  : delay    The delay required
*
* Returns    : None
*
**************************************************************************************************************
*/

void  Host_DelayUS (USB_INT32U  delay)
{
    volatile  USB_INT32U  i;

    for (i = 0; i < (4 * delay); i++) {    /* This logic was tested. It gives app. 1 micro sec delay        */
        ;
    }

}

// bits of the USB/OTG clock control register
#define HOST_CLK_EN     (1<<0)
#define DEV_CLK_EN      (1<<1)
#define PORTSEL_CLK_EN  (1<<3)
#define AHB_CLK_EN      (1<<4)

// bits of the USB/OTG clock status register
#define HOST_CLK_ON     (1<<0)
#define DEV_CLK_ON      (1<<1)
#define PORTSEL_CLK_ON  (1<<3)
#define AHB_CLK_ON      (1<<4)

// we need host clock, OTG/portsel clock and AHB clock
#define CLOCK_MASK (HOST_CLK_EN | PORTSEL_CLK_EN | AHB_CLK_EN)

/*
**************************************************************************************************************
*                                         INITIALIZE THE HOST CONTROLLER
*
* Description: This function initializes lpc17xx host controller
*
* Arguments  : None
*
* Returns    : 
*
**************************************************************************************************************
*/
void  Host_Init (void)
{
    PRINT_Log("In Host_Init\n");
    NVIC_DisableIRQ(USB_IRQn);                           /* Disable the USB interrupt source           */
    
    // turn on power for USB
    LPC_SC->PCONP       |= (1UL<<31);
    // Enable USB host clock, port selection and AHB clock
    LPC_USB->USBClkCtrl |= CLOCK_MASK;
    // Wait for clocks to become available
    while ((LPC_USB->USBClkSt & CLOCK_MASK) != CLOCK_MASK)
        ;
    
    // it seems the bits[0:1] mean the following
    // 0: U1=device, U2=host
    // 1: U1=host, U2=host
    // 2: reserved
    // 3: U1=host, U2=device
    // NB: this register is only available if OTG clock (aka "port select") is enabled!!
    // since we don't care about port 2, set just bit 0 to 1 (U1=host)
    LPC_USB->OTGStCtrl |= 1;
    
    // now that we've configured the ports, we can turn off the portsel clock
    LPC_USB->USBClkCtrl &= ~PORTSEL_CLK_EN;
    
    // power pins are not connected on mbed, so we can skip them
    /* P1[18] = USB_UP_LED, 01 */
    /* P1[19] = /USB_PPWR,     10 */
    /* P1[22] = USB_PWRD, 10 */
    /* P1[27] = /USB_OVRCR, 10 */
    /*LPC_PINCON->PINSEL3 &= ~((3<<4) | (3<<6) | (3<<12) | (3<<22));  
    LPC_PINCON->PINSEL3 |=  ((1<<4)|(2<<6) | (2<<12) | (2<<22));   // 0x00802080
    */

    // configure USB D+/D- pins
    /* P0[29] = USB_D+, 01 */
    /* P0[30] = USB_D-, 01 */
    LPC_PINCON->PINSEL1 &= ~((3<<26) | (3<<28));  
    LPC_PINCON->PINSEL1 |=  ((1<<26)|(1<<28));     // 0x14000000
        
    PRINT_Log("Initializing Host Stack\n");

    Hcca       = (volatile  HCCA       *)(HostBuf+0x000);
    TDHead     = (volatile  HCTD       *)(HostBuf+0x100);
    TDTail     = (volatile  HCTD       *)(HostBuf+0x110);
    EDCtrl     = (volatile  HCED       *)(HostBuf+0x120);
    //Space for Bulk Eps
//    EDBulkHead   = (volatile  HCED       *)(HostBuf+0x130);
//    EDBulkIn   = (volatile  HCED       *)(HostBuf+0x130);
//    EDBulkOut  = (volatile  HCED       *)(HostBuf+0x140);
//    TDBuffer   = (volatile  USB_INT08U *)(HostBuf+0x150);
    TDBuffer   = (volatile  USB_INT08U *)(HostBuf+0x130);
    
//    printf("\r\n--EDBulkHead = %p--\r\n", EDBulkHead);
    printf("\r\n--TDBuffer = %p--\r\n", TDBuffer);
    
    /* Initialize all the TDs, EDs and HCCA to 0  */
    Host_EDInit(EDCtrl);
//    Host_EDInit(EDBulkIn);
//    Host_EDInit(EDBulkOut);
  /*  Host_TDInit(TDHead);
    Host_TDInit(TDTail);*/
    Host_HCCAInit(Hcca);
    
    Host_DelayMS(50);                                   /* Wait 50 ms before apply reset              */
    LPC_USB->HcControl       = 0;                       /* HARDWARE RESET                             */
    LPC_USB->HcControlHeadED = 0;                       /* Initialize Control list head to Zero       */
    LPC_USB->HcBulkHeadED    = 0;                       /* Initialize Bulk list head to Zero          */
    
                                                        /* SOFTWARE RESET                             */
    LPC_USB->HcCommandStatus = OR_CMD_STATUS_HCR;
    LPC_USB->HcFmInterval    = DEFAULT_FMINTERVAL;      /* Write Fm Interval and Largest Data Packet Counter */

                                                        /* Put HC in operational state                */
    LPC_USB->HcControl  = (LPC_USB->HcControl & (~OR_CONTROL_HCFS)) | OR_CONTROL_HC_OPER;
    LPC_USB->HcRhStatus = OR_RH_STATUS_LPSC;            /* Set Global Power                           */
    
    LPC_USB->HcHCCA = (USB_INT32U)Hcca;
    LPC_USB->HcInterruptStatus |= LPC_USB->HcInterruptStatus;                   /* Clear Interrrupt Status                    */


    LPC_USB->HcInterruptEnable  = OR_INTR_ENABLE_MIE |
                         OR_INTR_ENABLE_WDH |
                         OR_INTR_ENABLE_RHSC;

    NVIC_SetPriority(USB_IRQn, 0);       /* highest priority */
    /* Enable the USB Interrupt */
    NVIC_EnableIRQ(USB_IRQn);
    PRINT_Log("Host Initialized\n");
}

/*
**************************************************************************************************************
*                                         INTERRUPT SERVICE ROUTINE
*
* Description: This function services the interrupt caused by host controller
*
* Arguments  : None
*
* Returns    : None
*
**************************************************************************************************************
*/

void USB_IRQHandler (void) __irq
{
    USB_INT32U   int_status;
    USB_INT32U   ie_status;

    int_status    = LPC_USB->HcInterruptStatus;                          /* Read Interrupt Status                */
    ie_status     = LPC_USB->HcInterruptEnable;                          /* Read Interrupt enable status         */
 
    if (!(int_status & ie_status)) {
        return;
    } else {

        int_status = int_status & ie_status;
        if (int_status & OR_INTR_STATUS_RHSC) {                 /* Root hub status change interrupt     */
            if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CSC) {
                if (LPC_USB->HcRhStatus & OR_RH_STATUS_DRWE) {
                    /*
                     * When DRWE is on, Connect Status Change
                     * means a remote wakeup event.
                    */
                    HOST_RhscIntr = 1;// JUST SOMETHING FOR A BREAKPOINT
                }
                else {
                    /*
                     * When DRWE is off, Connect Status Change
                     * is NOT a remote wakeup event
                    */
                    if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CCS) {
                        if (!gUSBConnected) {
                            HOST_TDControlStatus = 0;
                            HOST_WdhIntr = 0;
                            HOST_RhscIntr = 1;
                            gUSBConnected = 1;
                        }
                        else
                            PRINT_Log("Spurious status change (connected)?\n");
                    } else {
                        if (gUSBConnected) {
                            LPC_USB->HcInterruptEnable = 0; // why do we get multiple disc. rupts???
                            HOST_RhscIntr = 0;
                            gUSBConnected = 0;
                        }
                        else
                            PRINT_Log("Spurious status change (disconnected)?\n");
                    }
                }
                LPC_USB->HcRhPortStatus1 = OR_RH_PORT_CSC;
            }
            if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_PRSC) {
                LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC;
            }
        }
        if (int_status & OR_INTR_STATUS_WDH) {                  /* Writeback Done Head interrupt        */
            HOST_WdhIntr = 1;
            HOST_TDControlStatus = (TDHead->Control >> 28) & 0xf;
            //UsbEndpoint Cb : TODO
            //UsbEndpoint::completed();
        }            
        LPC_USB->HcInterruptStatus = int_status;                         /* Clear interrupt status register      */
    }
    return;
}

/*
**************************************************************************************************************
*                                     PROCESS TRANSFER DESCRIPTOR
*
* Description: This function processes the transfer descriptor
*
* Arguments  : ed            Endpoint descriptor that contains this transfer descriptor
*              token         SETUP, IN, OUT
*              buffer        Current Buffer Pointer of the transfer descriptor
*              buffer_len    Length of the buffer
*
* Returns    : OK       if TD submission is successful
*              ERROR    if TD submission fails
*
**************************************************************************************************************
*/

volatile USB_INT32U h;

USB_INT32S  Host_TDresult(volatile  HCED       *ed,
                           volatile  USB_INT32U  token)
{
    if(HOST_WdhIntr)
      HOST_WdhIntr = 0;
    else
      __WFI();
    
    if(ed->HeadTd == h)
    {
      return PROCESSING;
    }
   
    if (!HOST_TDControlStatus) {
        return (OK);
    } else {      
        return (ERR_TD_FAIL);
    }
}

USB_INT32S  Host_ProcessTD (volatile  HCED       *ed,
                            volatile  USB_INT32U  token,
                            volatile  USB_INT08U *buffer,
                                      USB_INT32U  buffer_len,
                                      bool        block /* = true */ )
{
    volatile  USB_INT32U   td_toggle;


    if (ed == EDCtrl) {
        if (token == TD_SETUP) {
            td_toggle = TD_TOGGLE_0;
        } else {
            td_toggle = TD_TOGGLE_1;
        }
    } else {
        td_toggle = 0;
    }
    TDHead->Control = (TD_ROUNDING    |
                      token           |
                      TD_DELAY_INT(0) |                           
                      td_toggle       |
                      TD_CC);
    TDTail->Control = 0;
    TDHead->CurrBufPtr   = (USB_INT32U) buffer;
    TDTail->CurrBufPtr   = 0;
    TDHead->Next         = (USB_INT32U) TDTail;
    TDTail->Next         = 0;
    TDHead->BufEnd       = (USB_INT32U)(buffer + (buffer_len - 1));
    TDTail->BufEnd       = 0;

    h = ed->HeadTd  = (USB_INT32U)TDHead | ((ed->HeadTd) & 0x00000002);
    ed->TailTd  = (USB_INT32U)TDTail;
    ed->Next    = 0;

    if (ed == EDCtrl) {
        LPC_USB->HcControlHeadED = (USB_INT32U)ed;
        LPC_USB->HcCommandStatus = LPC_USB->HcCommandStatus | OR_CMD_STATUS_CLF;
        LPC_USB->HcControl       = LPC_USB->HcControl       | OR_CONTROL_CLE;
    } else {
        LPC_USB->HcBulkHeadED    = (USB_INT32U)ed;
        LPC_USB->HcCommandStatus = LPC_USB->HcCommandStatus | OR_CMD_STATUS_BLF;
        LPC_USB->HcControl       = LPC_USB->HcControl       | OR_CONTROL_BLE;
    }    
    
    if(block)
    {
      while(ed->HeadTd == h)
      {
        Host_WDHWait();
      }
    }
    else
    {
      return PROCESSING;
    }

//    if (!(TDHead->Control & 0xF0000000)) {
    if (!HOST_TDControlStatus) {
        return (OK);
    } else {      
        return (ERR_TD_FAIL);
    }
}

/*
**************************************************************************************************************
*                                       ENUMERATE THE DEVICE
*
* Description: This function is used to enumerate the device connected
*
* Arguments  : None
*
* Returns    : None
*
**************************************************************************************************************
*/

USB_INT32S  Host_EnumDev (void)
{
    USB_INT32S  rc;

    PRINT_Log("\r\nConnect a device\r\n");
    while (!HOST_RhscIntr)
        __WFI();
    Host_DelayMS(100);                             /* USB 2.0 spec says atleast 50ms delay beore port reset */
    LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRS; // Initiate port reset
    while (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_PRS)
        __WFI(); // Wait for port reset to complete...
    LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC; // ...and clear port reset signal
    Host_DelayMS(200);                                                 /* Wait for 100 MS after port reset  */

    EDCtrl->Control = 8 << 16;                                         /* Put max pkt size = 8              */
                                                                       /* Read first 8 bytes of device desc */
    rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_DEVICE, 0, TDBuffer, 8);
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
    EDCtrl->Control = TDBuffer[7] << 16;                               /* Get max pkt size of endpoint 0    */
    rc = HOST_SET_ADDRESS(1);                                          /* Set the device address to 1       */
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
    Host_DelayMS(2);
    EDCtrl->Control = (EDCtrl->Control) | 1;                          /* Modify control pipe with address 1 */
    
    /**/
    
    rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_DEVICE, 0, TDBuffer, 17); //Read full device descriptor
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
    
    rc = SerialCheckVidPid();
    if (rc != OK) {
      PRINT_Err(rc);
      return (rc);
    }
    /**/
                                                                      /* Get the configuration descriptor   */
    rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_CONFIGURATION, 0, TDBuffer, 9);
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
                                                                       /* Get the first configuration data  */
    rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_CONFIGURATION, 0, TDBuffer, ReadLE16U(&TDBuffer[2]));
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
    #ifdef MS
    rc = MS_ParseConfiguration();                                      /* Parse the configuration           */
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
    #endif
    PRINT_Log("\r\nParsing cfg\r\n");
    rc = SerialParseConfig();                                      /* Parse the configuration           */
    if (rc != OK) {
        PRINT_Err(rc);
        return (rc);
    }
    
    rc = USBH_SET_CONFIGURATION(1);                                    /* Select device configuration 1     */
    if (rc != OK) {
        PRINT_Err(rc);
    }
    Host_DelayMS(100);                                               /* Some devices may require this delay */
    return (rc);
}

/*
**************************************************************************************************************
*                                        RECEIVE THE CONTROL INFORMATION
*
* Description: This function is used to receive the control information
*
* Arguments  : bm_request_type
*              b_request
*              w_value
*              w_index
*              w_length
*              buffer
*
* Returns    : OK       if Success
*              ERROR    if Failed
*
**************************************************************************************************************
*/
   
USB_INT32S  Host_CtrlRecv (         USB_INT08U   bm_request_type,
                                    USB_INT08U   b_request,
                                    USB_INT16U   w_value,
                                    USB_INT16U   w_index,
                                    USB_INT16U   w_length,
                          volatile  USB_INT08U  *buffer)
{
    USB_INT32S  rc;


    Host_FillSetup(bm_request_type, b_request, w_value, w_index, w_length);
    rc = Host_ProcessTD(EDCtrl, TD_SETUP, TDBuffer, 8);
    if (rc == OK) {
        if (w_length) {
            rc = Host_ProcessTD(EDCtrl, TD_IN, TDBuffer, w_length);
        }
        if (rc == OK) {
            rc = Host_ProcessTD(EDCtrl, TD_OUT, NULL, 0);
        }
    }
    return (rc);
}

/*
**************************************************************************************************************
*                                         SEND THE CONTROL INFORMATION
*
* Description: This function is used to send the control information
*
* Arguments  : None
*
* Returns    : OK                      if Success
*              ERR_INVALID_BOOTSIG    if Failed
*
**************************************************************************************************************
*/

USB_INT32S  Host_CtrlSend (          USB_INT08U   bm_request_type,
                                     USB_INT08U   b_request,
                                     USB_INT16U   w_value,
                                     USB_INT16U   w_index,
                                     USB_INT16U   w_length,
                           volatile  USB_INT08U  *buffer)
{
    USB_INT32S  rc;


    Host_FillSetup(bm_request_type, b_request, w_value, w_index, w_length);

    rc = Host_ProcessTD(EDCtrl, TD_SETUP, TDBuffer, 8);
    if (rc == OK) {
        if (w_length) {
            rc = Host_ProcessTD(EDCtrl, TD_OUT, TDBuffer, w_length);
        }
        if (rc == OK) {
            rc = Host_ProcessTD(EDCtrl, TD_IN, NULL, 0);
        }
    }
    return (rc);
}

/*
**************************************************************************************************************
*                                          FILL SETUP PACKET
*
* Description: This function is used to fill the setup packet
*
* Arguments  : None
*
* Returns    : OK                      if Success
*              ERR_INVALID_BOOTSIG    if Failed
*
**************************************************************************************************************
*/

void  Host_FillSetup (USB_INT08U   bm_request_type,
                      USB_INT08U   b_request,
                      USB_INT16U   w_value,
                      USB_INT16U   w_index,
                      USB_INT16U   w_length)
{
    int i;
    for (i=0;i<w_length;i++)
        TDBuffer[i] = 0;
    
    TDBuffer[0] = bm_request_type;
    TDBuffer[1] = b_request;
    WriteLE16U(&TDBuffer[2], w_value);
    WriteLE16U(&TDBuffer[4], w_index);
    WriteLE16U(&TDBuffer[6], w_length);
}



/*
**************************************************************************************************************
*                                         INITIALIZE THE TRANSFER DESCRIPTOR
*
* Description: This function initializes transfer descriptor
*
* Arguments  : Pointer to TD structure
*
* Returns    : None
*
**************************************************************************************************************
*/

void  Host_TDInit (volatile  HCTD *td)
{

    td->Control    = 0;
    td->CurrBufPtr = 0;
    td->Next       = 0;
    td->BufEnd     = 0;
}

/*
**************************************************************************************************************
*                                         INITIALIZE THE ENDPOINT DESCRIPTOR
*
* Description: This function initializes endpoint descriptor
*
* Arguments  : Pointer to ED strcuture
*
* Returns    : None
*
**************************************************************************************************************
*/

void  Host_EDInit (volatile  HCED *ed)
{

    ed->Control = 0;
    ed->TailTd  = 0;
    ed->HeadTd  = 0;
    ed->Next    = 0;
}

/*
**************************************************************************************************************
*                                 INITIALIZE HOST CONTROLLER COMMUNICATIONS AREA
*
* Description: This function initializes host controller communications area
*
* Arguments  : Pointer to HCCA
*
* Returns    : 
*
**************************************************************************************************************
*/

void  Host_HCCAInit (volatile  HCCA  *hcca)
{
    USB_INT32U  i;


    for (i = 0; i < 32; i++) {

        hcca->IntTable[i] = 0;
        hcca->FrameNumber = 0;
        hcca->DoneHead    = 0;
    }

}

/*
**************************************************************************************************************
*                                         WAIT FOR WDH INTERRUPT
*
* Description: This function is infinite loop which breaks when ever a WDH interrupt rises
*
* Arguments  : None
*
* Returns    : None
*
**************************************************************************************************************
*/

void  Host_WDHWait (void)
{
  while (!HOST_WdhIntr)
      __WFI();

  HOST_WdhIntr = 0;
}

/*
**************************************************************************************************************
*                                         READ LE 32U
*
* Description: This function is used to read an unsigned integer from a character buffer in the platform
*              containing little endian processor
*
* Arguments  : pmem    Pointer to the character buffer
*
* Returns    : val     Unsigned integer
*
**************************************************************************************************************
*/

USB_INT32U  ReadLE32U (volatile  USB_INT08U  *pmem)
{
    USB_INT32U val = *(USB_INT32U*)pmem;
#ifdef __BIG_ENDIAN
    return __REV(val);
#else
    return val;
#endif    
}

/*
**************************************************************************************************************
*                                        WRITE LE 32U
*
* Description: This function is used to write an unsigned integer into a charecter buffer in the platform 
*              containing little endian processor.
*
* Arguments  : pmem    Pointer to the charecter buffer
*              val     Integer value to be placed in the charecter buffer
*
* Returns    : None
*
**************************************************************************************************************
*/

void  WriteLE32U (volatile  USB_INT08U  *pmem,
                            USB_INT32U   val)
{
#ifdef __BIG_ENDIAN
    *(USB_INT32U*)pmem = __REV(val);
#else
    *(USB_INT32U*)pmem = val;
#endif
}

/*
**************************************************************************************************************
*                                          READ LE 16U
*
* Description: This function is used to read an unsigned short integer from a charecter buffer in the platform
*              containing little endian processor
*
* Arguments  : pmem    Pointer to the charecter buffer
*
* Returns    : val     Unsigned short integer
*
**************************************************************************************************************
*/

USB_INT16U  ReadLE16U (volatile  USB_INT08U  *pmem)
{
    USB_INT16U val = *(USB_INT16U*)pmem;
#ifdef __BIG_ENDIAN
    return __REV16(val);
#else
    return val;
#endif    
}

/*
**************************************************************************************************************
*                                         WRITE LE 16U
*
* Description: This function is used to write an unsigned short integer into a charecter buffer in the
*              platform containing little endian processor
*
* Arguments  : pmem    Pointer to the charecter buffer
*              val     Value to be placed in the charecter buffer
*
* Returns    : None
*
**************************************************************************************************************
*/

void  WriteLE16U (volatile  USB_INT08U  *pmem,
                            USB_INT16U   val)
{
#ifdef __BIG_ENDIAN
    *(USB_INT16U*)pmem = (__REV16(val) & 0xFFFF);
#else
    *(USB_INT16U*)pmem = val;
#endif
}

/*
**************************************************************************************************************
*                                         READ BE 32U
*
* Description: This function is used to read an unsigned integer from a charecter buffer in the platform
*              containing big endian processor
*
* Arguments  : pmem    Pointer to the charecter buffer
*
* Returns    : val     Unsigned integer
*
**************************************************************************************************************
*/

USB_INT32U  ReadBE32U (volatile  USB_INT08U  *pmem)
{
    USB_INT32U val = *(USB_INT32U*)pmem;
#ifdef __BIG_ENDIAN
    return val;
#else
    return __REV(val);
#endif
}

/*
**************************************************************************************************************
*                                         WRITE BE 32U
*
* Description: This function is used to write an unsigned integer into a charecter buffer in the platform
*              containing big endian processor
*
* Arguments  : pmem    Pointer to the charecter buffer
*              val     Value to be placed in the charecter buffer
*
* Returns    : None
*
**************************************************************************************************************
*/

void  WriteBE32U (volatile  USB_INT08U  *pmem,
                            USB_INT32U   val)
{
#ifdef __BIG_ENDIAN
    *(USB_INT32U*)pmem = val;
#else
    *(USB_INT32U*)pmem = __REV(val);
#endif
}

/*
**************************************************************************************************************
*                                         READ BE 16U
*
* Description: This function is used to read an unsigned short integer from a charecter buffer in the platform
*              containing big endian processor
*
* Arguments  : pmem    Pointer to the charecter buffer
*
* Returns    : val     Unsigned short integer
*
**************************************************************************************************************
*/

USB_INT16U  ReadBE16U (volatile  USB_INT08U  *pmem)
{
    USB_INT16U val = *(USB_INT16U*)pmem;
#ifdef __BIG_ENDIAN
    return val;
#else
    return __REV16(val);
#endif    
}

/*
**************************************************************************************************************
*                                         WRITE BE 16U
*
* Description: This function is used to write an unsigned short integer into the charecter buffer in the
*              platform containing big endian processor
*
* Arguments  : pmem    Pointer to the charecter buffer
*              val     Value to be placed in the charecter buffer
*
* Returns    : None
*
**************************************************************************************************************
*/

void  WriteBE16U (volatile  USB_INT08U  *pmem,
                            USB_INT16U   val)
{
#ifdef __BIG_ENDIAN
    *(USB_INT16U*)pmem = val;
#else
    *(USB_INT16U*)pmem = (__REV16(val) & 0xFFFF);
#endif
}

#ifdef __cplusplus
}
#endif

#endif