/*----------------------------------------------------------------------------
 *      U S B  -  K e r n e l
 *----------------------------------------------------------------------------
 *      Name:    cdcuser.c
 *      Purpose: USB Communication Device Class User module
 *      Version: V1.10
 *----------------------------------------------------------------------------
*      This software is supplied "AS IS" without any warranties, express,
 *      implied or statutory, including but not limited to the implied
 *      warranties of fitness for purpose, satisfactory quality and
 *      noninfringement. Keil extends you a royalty-free right to reproduce
 *      and distribute executable files created using this software for use
 *      on NXP Semiconductors LPC microcontroller devices only. Nothing else
 *      gives you the right to use this software.
 *
 * Copyright (c) 2009 Keil - An ARM Company. All rights reserved.
 *---------------------------------------------------------------------------*/

#include "lpc_types.h"

#include "usb.h"
#include "usbhw.h"
#include "usbcfg.h"
#include "usbcore.h"
#include "cdc.h"
#include "cdcuser.h"

#ifdef __ICCARM__
#pragma data_alignment=4
#define __align(x)
#elif defined   (  __GNUC__  )
#define __align(x) __attribute__((aligned(x)))
#endif

unsigned char __align(4) BulkBufOut [USB_CDC_BUFSIZE];            // Buffer to store USB OUT packet

#ifdef __ICCARM__
#undef __align(x)
#endif

/*----------------------------------------------------------------------------
  We need a buffer for incomming data on USB port because USB receives
  much faster than  UART transmits
 *---------------------------------------------------------------------------*/
/* Buffer masks */
#define CDC_BUF_SIZE               (64)               // Output buffer in bytes (power 2)
                                                       // large enough for file transfer
#define CDC_BUF_MASK               (CDC_BUF_SIZE-1ul)

/* Buffer read / write macros */
#define CDC_BUF_RESET(cdcBuf)      (cdcBuf.rdIdx = cdcBuf.wrIdx = 0)
#define CDC_BUF_WR(cdcBuf, dataIn) (cdcBuf.data[CDC_BUF_MASK & cdcBuf.wrIdx++] = (dataIn))
#define CDC_BUF_RD(cdcBuf)         (cdcBuf.data[CDC_BUF_MASK & cdcBuf.rdIdx++])
#define CDC_BUF_EMPTY(cdcBuf)      (cdcBuf.rdIdx == cdcBuf.wrIdx)
#define CDC_BUF_FULL(cdcBuf)       (cdcBuf.rdIdx == cdcBuf.wrIdx+1)
#define CDC_BUF_COUNT(cdcBuf)      (CDC_BUF_MASK & (cdcBuf.wrIdx - cdcBuf.rdIdx))


// CDC output buffer
typedef struct __CDC_BUF_T {
  unsigned char data[CDC_BUF_SIZE];
  unsigned int wrIdx;
  unsigned int rdIdx;
} CDC_BUF_T;

CDC_BUF_T  CDC_OutBuf;                                 // buffer for all CDC Out data

/*----------------------------------------------------------------------------
  read data from CDC_OutBuf
 *---------------------------------------------------------------------------*/
int CDC_RdOutBuf (char *buffer, const int *length) {
  int bytesToRead, bytesRead;

  /* Read *length bytes, block if *bytes are not avaialable	*/
  bytesToRead = *length;
  bytesToRead = (bytesToRead < (*length)) ? bytesToRead : (*length);
  bytesRead = bytesToRead;

  // ... add code to check for underrun

  while (bytesToRead--) {
    *buffer++ = CDC_BUF_RD(CDC_OutBuf);
  }
  return (bytesRead);
}

/*----------------------------------------------------------------------------
  write data to CDC_OutBuf
 *---------------------------------------------------------------------------*/
int CDC_WrOutBuf (const char *buffer, int length) {
  int bytesWritten;

  // ... add code to check for overwrite

  for( bytesWritten = 0; bytesWritten < length; bytesWritten++ ) {
      CDC_BUF_WR(CDC_OutBuf, *buffer++);           // Copy Data to buffer
  }

  return (bytesWritten);
}

/*----------------------------------------------------------------------------
  check if character(s) are available at CDC_OutBuf
 *---------------------------------------------------------------------------*/
int CDC_OutBufAvailChar (int *availChar) {

  *availChar = CDC_BUF_COUNT(CDC_OutBuf);

  return (0);
}
/* end Buffer handling */



/*----------------------------------------------------------------------------
  CDC SendEncapsulatedCommand Request Callback
  Called automatically on CDC SEND_ENCAPSULATED_COMMAND Request
  Parameters:   None                          (global SetupPacket and EP0Buf)
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_SendEncapsulatedCommand (void) {

  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC GetEncapsulatedResponse Request Callback
  Called automatically on CDC Get_ENCAPSULATED_RESPONSE Request
  Parameters:   None                          (global SetupPacket and EP0Buf)
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_GetEncapsulatedResponse (void) {

  /* ... add code to handle request */
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC SetCommFeature Request Callback
  Called automatically on CDC Set_COMM_FATURE Request
  Parameters:   FeatureSelector
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_SetCommFeature (unsigned short wFeatureSelector) {

  /* ... add code to handle request */
  ( void ) wFeatureSelector;
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC GetCommFeature Request Callback
  Called automatically on CDC Get_COMM_FATURE Request
  Parameters:   FeatureSelector
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_GetCommFeature (unsigned short wFeatureSelector) {

  /* ... add code to handle request */
  ( void ) wFeatureSelector;
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC ClearCommFeature Request Callback
  Called automatically on CDC CLEAR_COMM_FATURE Request
  Parameters:   FeatureSelector
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_ClearCommFeature (unsigned short wFeatureSelector) {

  /* ... add code to handle request */
  ( void ) wFeatureSelector;
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC SetLineCoding Request Callback
  Called automatically on CDC SET_LINE_CODING Request
  Parameters:   none                    (global SetupPacket and EP0Buf)
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_SetLineCoding (void) {
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC GetLineCoding Request Callback
  Called automatically on CDC GET_LINE_CODING Request
  Parameters:   None                         (global SetupPacket and EP0Buf)
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_GetLineCoding (void) {
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC SetControlLineState Request Callback
  Called automatically on CDC SET_CONTROL_LINE_STATE Request
  Parameters:   ControlSignalBitmap
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_SetControlLineState (unsigned short wControlSignalBitmap) {

  /* ... add code to handle request */
  ( void ) wControlSignalBitmap;
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC SendBreak Request Callback
  Called automatically on CDC Set_COMM_FATURE Request
  Parameters:   0xFFFF  start of Break
                0x0000  stop  of Break
                0x####  Duration of Break
  Return Value: TRUE - Success, FALSE - Error
 *---------------------------------------------------------------------------*/
uint32_t CDC_SendBreak (unsigned short wDurationOfBreak) {

  /* ... add code to handle request */
  ( void ) wDurationOfBreak;
  return (TRUE);
}


/*----------------------------------------------------------------------------
  CDC_BulkIn call on DataIn Request
  Parameters:   none
  Return Value: none
 *---------------------------------------------------------------------------*/
void CDC_BulkIn(void) {
}


/*----------------------------------------------------------------------------
  CDC_BulkOut call on DataOut Request
  Parameters:   none
  Return Value: none
 *---------------------------------------------------------------------------*/
void CDC_BulkOut(void) {
  int numBytesRead;

  // get data from USB into intermediate buffer
  numBytesRead = USB_ReadEP(CDC_DEP_OUT, &BulkBufOut[0]);

  // ... add code to check for overwrite

  // store data in a buffer to transmit it over serial interface
  CDC_WrOutBuf ((char *)&BulkBufOut[0], numBytesRead);
  vCDCNewDataNotify();
}

void CDC_BulkOutNak(void){

    USB_ReadReqEP(CDC_DEP_OUT, &BulkBufOut[0], 64);
}