max3420e usb Controller

/*

 * EnumApp_enum_data.h

 *

 *  Created on: Jul 16, 2014

 *      Author: rnv5kor

 */

// EnumApp_enum_data.h

// Enumeration tables & HID keyboard data

//

const unsigned char device_descriptor[]=  // DEVICE Descriptor

        {0x12,             // bLength = 18d

        0x01,      // bDescriptorType = Device (1)

        0x00,0x01,    // bcdUSB(L/H) USB spec rev (BCD)

  0x00,0x00,0x00,   // bDeviceClass, bDeviceSubClass, bDeviceProtocol

  0x40,      // bMaxPacketSize0 EP0 is 64 bytes

  0x6A,0x0B,    // idVendor(L/H)--Maxim is 0B6A

  0x46,0x53,    // idProduct(L/H)--5346

  0x34,0x12,    // bcdDevice--1234

  1,2,3,      // iManufacturer, iProduct, iSerialNumber

  1};      // bNumConfigurations

const unsigned char configuration_descriptor[]=  // CONFIGURATION Descriptor

  {0x09,      // bLength

  0x02,      // bDescriptorType = Config

  0x22,0x00,    // wTotalLength(L/H) = 34 bytes

  0x02,      // bNumInterfaces

  0x01,      // bConfigValue

  0x00,      // iConfiguration

  0xA0,      // bmAttributes. b7=1 b6= no self-powered b5=RWU supported

  0xFA,      // MaxPower is 2 ma

// INTERFACE Descriptor

  0x09, // length = 9

  0x04, // type = IF

  0x00, // InterFace Number = 0

  0x00, // bAlternate Setting

  0x01, // bNum Endpoints = 1 IN

  0x02, // bInterfaceClass = 2 Communication

  0x02, // bInterfaceSubClass = 2

  0x01, // bInterfaceProtocol =1 (SubClass ACM=Abstract Control Mode, InterfaceProtocol=V.25ter, common AT commands)

  0x00, // iInterface

  // Header Functional Descriptor (marks beginning of the concatenated set of Functional Descriptors)

  0x05, // bFunctionLength, Descriptor size in bytes --[18] --[48]

  0x24, // bDescriptorType, CS_INTERFACE

  0x00, // bDescriptorSubtype, Header Functional Descriptor

  0x10,0x01, // bcdCDC, CDC specification release number in BCD format ([0x10, 0x01])

  // Call Management Functional Descriptor

  0x05, // bFunctionLength, Descriptor size in bytes

  0x24, // bDescriptorType, CS_INTERFACE

  0x01, // bDescriptorSubtype, Call Management Functional Descriptor

  0x03, // bmCapabilities, Device doesn't call management itself (0->3)

  0x01, // bDataInterface, Interface used for call management

  // Abstract Control Management Functional Descriptor

  0x04, // bDescriptorLength, Descriptor size in bytes

  0x24, // bDescriptorType, CS_INTERFACE

  0x02, // bDescriptorSubtype, Abstract Control Management Functional Descriptor

  0x06, // bmCapabilities, Support for the GET/SET_LINE_CODING, BREAK & SET_CONTROL_LINE_STATE (2->6)

  // Union Functional Descriptor

  0x05, // bFunctionLength, Descriptor size in bytes

  0x24, // bDescriptorType, CS_INTERFACE

  0x06, // bDescriptorSubtype, Union Functional Descriptor

  0x00, // bMasterInterface, The controlling interface for the union (bInterfaceNumber of a Communication or Data Class interface in this configuration)

  0x01, // bSlaveInterface0, The controlled interace in the union (bInterfaceNumber of an interface in this configuration)

  ///////////****************** Call Management Functional Descriptor*****************

  // Endpoint Descriptor EP3-IN

  0x07, // bLength

  0x05, // bDescriptorType (Endpoint)

  0x83, // bEndpointAddress (EP3 IN)

  0x03, // bmAttributes (interrupt = 3)

  0x40,0x00, // wMaxPacketSize (64[0x0040])

  0x02, // bInterval, Maximum latency (0x02)

  // INTERFACE Descriptor

  0x09, // length = 9 --[44]

  0x04, // type = IF

  0x01, // InterFace Number = 1

  0x00, // bAlternate Setting

  0x02, // bNum Endpoints = 2 (IN&OUT)

  0x0A, // bInterfaceClass = A (Data)

  0x00,0x00, // bInterfaceSubClass, bInterfaceProtocol (SubClass ACM=Abstract Control Mode, InterfaceProtocol=V.25ter, common AT commands)

  0x00, // iInterface

  // Endpoint Descriptor EP1-OUT

  0x07, // bLength

  0x05, // bDescriptorType (Endpoint)

  0x01, // bEndpointAddress (EP1-OUT)

  0x02, // bmAttributes (bulk = 2)

  0x40,0x00, // wMaxPacketSize (64[0x40])

  0x00, // bInterval (0x00)

  // Endpoint Descriptor EP2-IN

  0x07, // bLength

  0x05, // bDescriptorType (Endpoint)

  0x82, // bEndpointAddress (EP2-IN)

  0x02, // bmAttributes (bulk = 2)

  0x40,0x00, // wMaxPacketSize (64[0x40])

  0x00, // bInterval (0x00)

  };

// STRING descriptors. An array of string arrays

const unsigned char string_descriptor[][64]= {

// STRING descriptor 0--Language string

{

0x04, // bLength

0x03, // bDescriptorType = string

0x09,0x04 // wLANGID(L/H) = English-United Sates

},

// STRING descriptor 1--Manufacturer ID

{

34, // bLength (0x2C para 23 (incluyendo tamaño y tipo??)

0x03, // bDescriptorType = string

'x',0,

'x',0,

'x',0,

'x',0,

' ',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,

'x',0,// text in Unicode

},

// STRING descriptor 2 - Product ID

{ 8, // bLength

0x03, // bDescriptorType = string

'X',0,

'X',0,

'X',0,

},

// STRING descriptor 3 - Serial Number ID

{ 8, // bLength

0x03, // bDescriptorType = string

'X',0,

'X',0,

'X',0,

}};

const unsigned char SerialConf[]=

{

0x00,0xE8,0x03,0x00, // dwDTFRate. Baudrate (9600hex->38400 baud)

0, // bCharFormat. 1 Stop bit

0, // bParityType: none

8, // Number of data bits: 8

};

// MAX3420E_BF1.h

// Macros

// See the single bug fix below.

//

// For active-high lights attached to MAX3420E GP-Output pins.

#define L0_OFF wreg(rGPIO,(rreg(rGPIO) & 0xFE));

#define L0_ON wreg(rGPIO,(rreg(rGPIO) | 0x01));

#define L1_OFF wreg(rGPIO,(rreg(rGPIO) & 0xFD));

#define L1_ON wreg(rGPIO,(rreg(rGPIO) | 0x02));

#define L2_OFF wreg(rGPIO,(rreg(rGPIO) & 0xFB));

#define L2_ON wreg(rGPIO,(rreg(rGPIO) | 0x04));

#define L3_OFF wreg(rGPIO,(rreg(rGPIO) & 0xF7));

#define L3_ON wreg(rGPIO,(rreg(rGPIO) | 0x08));

#define L0_BLINK wreg(rGPIO,(rreg(rGPIO) ^ 0x01));

#define L1_BLINK wreg(rGPIO,(rreg(rGPIO) ^ 0x02));

#define L2_BLINK wreg(rGPIO,(rreg(rGPIO) ^ 0x04));

#define L3_BLINK wreg(rGPIO,(rreg(rGPIO) ^ 0x08));

#define SETBIT(reg,val) Max_wreg(reg,(Max_rreg(reg)|val));

#define CLRBIT(reg,val) Max_wreg(reg,(Max_rreg(reg)&~val));

// ************ BUG FIX ************

//#define STALL_EP0 wreg(9,0x23); // Set all three EP0 stall bits--data stage IN/OUT and status stage

// BUG FIX 2-9-06. The above statement hard-codes the register number to 9, ignoring the fact that

// the wreg function expects the register numbers to be pre-shifted 3 bits to put them into the 5 MSB's of

// the SPI command byte. Here is the correction:

#define STALL_EP0 Max_wreg(rEPSTALLS,0x23);  // Set all three EP0 stall bits--data stage IN/OUT and status stage

// ******** END OF BUG FIX**********

#define MSB(word) (BYTE)(((WORD)(word) >> 8) & 0xff)

#define LSB(word) (BYTE)((WORD)(word) & 0xff)

// MAX3420E Registers

#define rEP0FIFO    0<<3

#define rEP1OUTFIFO 1<<3

#define rEP2INFIFO  2<<3

#define rEP3INFIFO  3<<3

#define rSUDFIFO    4<<3

#define rEP0BC      5<<3

#define rEP1OUTBC   6<<3

#define rEP2INBC    7<<3

#define rEP3INBC    8<<3

#define rEPSTALLS   9<<3

#define rCLRTOGS    10<<3

#define rEPIRQ      11<<3

#define rEPIEN      12<<3

#define rUSBIRQ     13<<3

#define rUSBIEN     14<<3

#define rUSBCTL     15<<3

#define rCPUCTL     16<<3

#define rPINCTL     17<<3

#define rRevision   18<<3

#define rFNADDR     19<<3

#define rGPIO       20<<3

// MAX3420E bit masks for register bits

// R9 EPSTALLS Register

#define bmACKSTAT   0x40

#define bmSTLSTAT   0x20

#define bmSTLEP3IN  0x10

#define bmSTLEP2IN  0x08

#define bmSTLEP1OUT 0x04

#define bmSTLEP0OUT 0x02

#define bmSTLEP0IN  0x01

// R10 CLRTOGS Register

#define bmEP3DISAB  0x80

#define bmEP2DISAB  0x40

#define bmEP1DISAB  0x20

#define bmCTGEP3IN  0x10

#define bmCTGEP2IN  0x08

#define bmCTGEP1OUT 0x04

// R11 EPIRQ register bits

#define bmSUDAVIRQ  0x20

#define bmIN3BAVIRQ 0x10

#define bmIN2BAVIRQ 0x08

#define bmOUT1DAVIRQ 0x04

#define bmOUT0DAVIRQ 0x02

#define bmIN0BAVIRQ 0x01

// R12 EPIEN register bits

#define bmSUDAVIE   0x20

#define bmIN3BAVIE  0x10

#define bmIN2BAVIE  0x08

#define bmOUT1DAVIE 0x04

#define bmOUT0DAVIE 0x02

#define bmIN0BAVIE  0x01

// R13 USBIRQ register bits

#define bmURESDNIRQ 0x80

#define bmVBUSIRQ   0x40

#define bmNOVBUSIRQ 0x20

#define bmSUSPIRQ   0x10

#define bmURESIRQ   0x08

#define bmBUSACTIRQ 0x04

#define bmRWUDNIRQ  0x02

#define bmOSCOKIRQ  0x01

// R14 USBIEN register bits

#define bmURESDNIE  0x80

#define bmVBUSIE    0x40

#define bmNOVBUSIE  0x20

#define bmSUSPIE    0x10

#define bmURESIE    0x08

#define bmBUSACTIE  0x04

#define bmRWUDNIE   0x02

#define bmOSCOKIE   0x01

// R15 USBCTL Register

#define bmHOSCSTEN  0x80

#define bmVBGATE    0x40

#define bmCHIPRES   0x20

#define bmPWRDOWN   0x10

#define bmCONNECT   0x08

#define bmSIGRWU    0x04

// R16 CPUCTL Register

#define bmIE        0x01

// R17 PINCTL Register

#define bmFDUPSPI   0x10

#define bmINTLEVEL  0x08

#define bmPOSINT    0x04

#define bmGPOB      0x02

#define  bmGPOA      0x01

//

// GPX[B:A] settings (PINCTL register)

#define gpxOPERATE  0x00

#define gpxVBDETECT 0x01

#define gpxBUSACT   0x02

#define gpxSOF      0x03

// ************************

// Standard USB Requests

#define SR_GET_STATUS 0x00 // Get Status

#define SR_CLEAR_FEATURE 0x01 // Clear Feature

#define SR_RESERVED 0x02 // Reserved

#define SR_SET_FEATURE 0x03 // Set Feature

#define SR_SET_ADDRESS 0x05 // Set Address

#define SR_GET_DESCRIPTOR 0x06 // Get Descriptor

#define SR_SET_DESCRIPTOR 0x07 // Set Descriptor

#define SR_GET_CONFIGURATION 0x08 // Get Configuration

#define SR_SET_CONFIGURATION 0x09 // Set Configuration

#define SR_GET_INTERFACE 0x0a // Get Interface

#define SR_SET_INTERFACE 0x0b // Set Interface

// Get Descriptor codes

#define GD_DEVICE 0x01 // Get device descriptor: Device

#define GD_CONFIGURATION 0x02 // Get device descriptor: Configuration

#define GD_STRING 0x03 // Get device descriptor: String

#define GD_REPORT 0x22 // Get descriptor: Report

#define CS_INTERFACE 0x24 // Get descriptor: Interface

#define CS_ENDPOINT 0x25 // Get descriptor: Endpoint

// SETUP packet offsets

#define bmRequestType 0

#define bRequest 1

#define wValueL 2

#define wValueH 3

#define wIndexL 4

#define wIndexH 5

#define wLengthL 6

#define wLengthH 7

// CDC bRequest values

#define SEND_ENCAPSULATED_COMMAND 0x00

#define GET_ENCAPSULATED_RESPONSE 0x01

#define SET_COMM_FEATURE 0x02

#define GET_COMM_FEATURE 0x03

#define CLEAR_COMM_FEATURE 0x04

#define SET_LINE_CODING 0x20

#define GET_LINE_CODING 0x21

#define SET_CONTROL_LINE_STATE 0x22

#define SEND_BREAK 0x23

/*

 * MAX3420E_BF1.c

 *

 *  Created on: Jul 10, 2014

 *      Author: rnv5kor

 */

#include "xspi.h"

#include "xspi_l.h"

#include "xparameters.h"

#include "MAX3420E_BF1.h"

#include <stdio.h>

#include "platform.h"

#include "xbasic_types.h"

#include "time.h"

#include "EnumApp_enum_data.h"

typedef unsigned char BYTE;     // these save typing

typedef unsigned long uint32;

typedef unsigned long uint16;

typedef unsigned long uint8;

typedef unsigned short WORD;

#define TWENTY_MSEC 14200           // adjust this constant for 20 msec button checks

#define BLINKTIME 25                // blink every 500 msec

//Global variables

BYTE SUD[8];    // Local copy of the 8 setup data read from the MAX3420E SUDFIFO

BYTE msgidx,msglen;  // Text string in EnumApp_enum_data.h--index and length

BYTE configval;    // Set/Get_Configuration value

BYTE ep3stall;    // Flag for EP3 Stall, set by Set_Feature, reported back in Get_Status

BYTE interfacenum;      // Set/Get interface value

BYTE inhibit_send;  // Flag for the keyboard character send routine

BYTE RWU_enabled;       // Set by Set/Clear_Feature RWU request, sent back for Get_Status-RWU

BYTE Suspended;         // Tells the main loop to look for host resume and RWU pushbutton

WORD msec_timer;        // Count off time in the main loop

WORD blinktimer;        // Count milliseconds to blink the "loop active" light

BYTE send3zeros;        // EP3-IN function uses this to send HID (key up) codes between keystrokes

uint8 test_1,test_2,test_3,data;

static XSpi  mySPI;   /* The instance of the SPI device */

static XSpi SPI_SCK;

uint32  NumBytesSent = 0;

uint32  NumBytesRcvd = 0;

int PC_DTR=0;

#define ENABLE_IRQS Max_wreg(rEPIEN,(bmSUDAVIE+bmIN3BAVIE)); Max_wreg(rUSBIEN,(bmURESIE+bmURESDNIE));

// Note: the SUSPEND IRQ will be enabled later, when the device is configured.

// This prevents repeated SUSPEND IRQ's

extern void Max_wreg(BYTE r,BYTE v) ;

extern void Xps_SpiInit(void);

extern void Xps_Spi_Max_Transmit(void);

extern void IntialiseMax3420E(void);

extern void MAX_Reset(void);

extern BYTE Max_rreg(BYTE reg);

extern void Max_wregAS(BYTE reg, BYTE val);

extern BYTE Max_rregAS(BYTE reg);

extern void Max_readbytes(BYTE reg, BYTE N, BYTE *p);

extern void Max_writebytes(BYTE reg, BYTE N, BYTE *p);

BYTE MAX_Int_Pending(void);     // Poll the MAX3420E INT pin (set for active low level)

// USB functions

void std_request(void);

void class_request(void);

void vendor_request(void);

void send_descriptor(void);

void send_keystroke(BYTE);

void feature(BYTE);

void get_status(void);

void set_interface(void);

void get_interface(void);

void set_configuration(void);

void get_configuration(void);

// Application code

void do_SETUP(void);      // Handle a USB SETUP transfer

void do_IN3(void);        // Send keyboard characters over Endpoint 3-IN

void check_for_resume(void);

void service_irqs(void);

void initialize_MAX(void);

void check_for_resume(void)

{

  if(Max_rreg(rUSBIRQ) & bmBUSACTIRQ) // THE HOST RESUMEDBUS TRAFFIC

  {

    Suspended=0; // no longer suspended

  }

}

//

void service_irqs(void)

{

  BYTE itest1,itest2;

  itest1 = Max_rreg(rEPIRQ);            // Check the EPIRQ bits

  itest2 = Max_rreg(rUSBIRQ);           // Check the USBIRQ bits

  if(itest1 & bmSUDAVIRQ)

  {

    Max_wreg(rEPIRQ,bmSUDAVIRQ);     // clear the SUDAV IRQ

    do_SETUP();

  }

  if(itest1 & bmIN3BAVIRQ)          // Was an EP3-IN packet just dispatched to the host?

  {

    //do_IN3();                     // Yes--load another keystroke and arm the endpoint

  }                             // NOTE: don't clear the IN3BAVIRQ bit here--loading the EP3-IN byte

  // count register in the do_IN3() function does it.

  if((configval != 0) && (itest2&bmSUSPIRQ))   // HOST suspended bus for 3 msec

  {

    Max_wreg(rUSBIRQ,(bmSUSPIRQ+bmBUSACTIRQ));  // clear the IRQ and bus activity IRQ

    Suspended=1;                  // signal the main loop

  }

  if(Max_rreg(rUSBIRQ)& bmURESIRQ)

  {

    Max_wreg(rUSBIRQ,bmURESIRQ);      // clear the IRQ

  }

  if(Max_rreg(rUSBIRQ) & bmURESDNIRQ)

  {

    Max_wreg(rUSBIRQ,bmURESDNIRQ);    // clear the IRQ bit

    Suspended=0;                  // in case we were suspended

    ENABLE_IRQS                   // ...because a bus reset clears the IE bits

  }

}

void do_SETUP(void)

{

  int i;

  for (i=0;i<8;i++)

  {

    SUD[i]= Max_rreg(rSUDFIFO);          // got a SETUP packet. Read 8 SETUP bytes

  }

  switch(SUD[bmRequestType]&0x60)     // Parse the SETUP packet. For request type, look only at b6&b5

  {

  case 0x00:  std_request();    break;

  case 0x20:  class_request();  break;  // just a stub in this program

  case 0x40:  vendor_request();  break;  // just a stub in this program

  default:  STALL_EP0                       // unrecognized request type

  }

}

//*******************

void std_request(void)

{

  switch(SUD[bRequest])

  {

  case  SR_GET_DESCRIPTOR:  send_descriptor();    break;

  //case  SR_SET_FEATURE:    feature(1);           break;

  //case  SR_CLEAR_FEATURE:  feature(0);           break;

  //case  SR_GET_STATUS:    get_status();         break;

  case  SR_SET_INTERFACE:  set_interface();      break;

  case  SR_GET_INTERFACE:  get_interface();      break;

  case  SR_GET_CONFIGURATION:   get_configuration();  break;

  case  SR_SET_CONFIGURATION:   set_configuration();  break;

  case  SR_SET_ADDRESS:         Max_rregAS(rFNADDR);      break;  // discard return value

  default:  STALL_EP0

  }

}

//**************************

void set_configuration(void)

{

  configval=  wValueL; //SUD[wValueL];           // Store the config value

  if(configval != 0)                // If we are configured,

    SETBIT(rUSBIEN,bmSUSPIE);       // start looking for SUSPEND interrupts

  Max_rregAS(rFNADDR);                  // dummy read to set the ACKSTAT bit

}

void get_configuration(void)

{

  Max_wreg(rEP0FIFO,configval);         // Send the config value

  Max_wregAS(rEP0BC,1);

}

//**********************

void set_interface(void)  // All we accept are Interface=0 and AlternateSetting=0, otherwise send STALL

{

  BYTE dumval;

  if((SUD[wValueL]==0)    // wValueL=Alternate Setting index

      &&(SUD[wIndexL]==0))    // wIndexL=Interface index

    dumval = Max_rregAS(rFNADDR);  // dummy read to set the ACKSTAT bit

  else STALL_EP0

}

//**********************

void get_interface(void)  // Check for Interface=0, always report AlternateSetting=0

{

  if(SUD[wIndexL]==0)    // wIndexL=Interface index

  {

    Max_wreg(rEP0FIFO,0);    // AS=0

    Max_wregAS(rEP0BC,1);    // send one byte, ACKSTAT

  }

  else STALL_EP0

}

//*******************

void get_status(void)

{

  BYTE testbyte;

  testbyte=SUD[bmRequestType];

  switch(testbyte)

  {

  case 0x80:       // directed to DEVICE

    Max_wreg(rEP0FIFO,(RWU_enabled+1));  // first byte is 000000rs where r=enabled for RWU and s=self-powered.

    Max_wreg(rEP0FIFO,0x00);    // second byte is always 0

    Max_wregAS(rEP0BC,2);     // load byte count, arm the IN transfer, ACK the status stage of the CTL transfer

    break;

  case 0x81:       // directed to INTERFACE

    Max_wreg(rEP0FIFO,0x00);    // this one is easy--two zero bytes

    Max_wreg(rEP0FIFO,0x00);

    Max_wregAS(rEP0BC,2);     // load byte count, arm the IN transfer, ACK the status stage of the CTL transfer

    break;

  case 0x82:       // directed to ENDPOINT

    if(SUD[wIndexL]==0x83)    // We only reported ep3, so it's the only one the host can stall IN3=83

    {

      Max_wreg(rEP0FIFO,ep3stall);  // first byte is 0000000h where h is the halt (stall) bit

      Max_wreg(rEP0FIFO,0x00);    // second byte is always 0

      Max_wregAS(rEP0BC,2);     // load byte count, arm the IN transfer, ACK the status stage of the CTL transfer

      break;

    }

    else  STALL_EP0    // Host tried to stall an invalid endpoint (not 3)

  default:      STALL_EP0    // don't recognize the request

  }

}

// **********************************************************************************************

// FUNCTION: Set/Get_Feature. Call as feature(1) for Set_Feature or feature(0) for Clear_Feature.

// There are two set/clear feature requests:

//  To a DEVICE:   Remote Wakeup (RWU).

//    To an ENDPOINT:  Stall (EP3 only for this app)

//

void feature(BYTE sc)

{

  BYTE mask;

  if((SUD[bmRequestType]==0x02)  // dir=h->p, recipient = ENDPOINT

      &&  (SUD[wValueL]==0x00)  // wValueL is feature selector, 00 is EP Halt

      &&  (SUD[wIndexL]==0x83))  // wIndexL is endpoint number IN3=83

  {

    mask= Max_rreg(rEPSTALLS);   // read existing bits

    if(sc==1)               // set_feature

    {

      mask += bmSTLEP3IN;       // Halt EP3IN

      ep3stall=1;

    }

    else                        // clear_feature

    {

      mask &= ~bmSTLEP3IN;      // UnHalt EP3IN

      ep3stall=0;

      Max_wreg(rCLRTOGS,bmCTGEP3IN);  // clear the EP3 data toggle

    }

    Max_wreg(rEPSTALLS,(mask|bmACKSTAT)); // Don't use wregAS for this--directly writing the ACKSTAT bit

  }

  else if ((SUD[bmRequestType]==0x00)  // dir=h->p, recipient = DEVICE

      &&  (SUD[wValueL]==0x01))  // wValueL is feature selector, 01 is Device_Remote_Wakeup

  {

    RWU_enabled = sc<<1;  // =2 for set, =0 for clear feature. The shift puts it in the get_status bit position.

    Max_rregAS(rFNADDR);    // dummy read to set ACKSTAT

  }

  else STALL_EP0

}

//************************

void send_descriptor(void)

{

  uint16 reqlen,sendlen,desclen;

  BYTE *pDdata; // pointer to ROM Descriptor data to send

  // NOTE This function assumes all descriptors are 64 or fewer bytes and canbe sent in a single packet

  desclen = 0; // check for zero as error condition (no casestatements satisfied)

  reqlen = SUD[wLengthL] + 256*SUD[wLengthH]; // 16-bit

  switch (SUD[wValueH]) // wValueH is descriptor type

  {

  case GD_DEVICE:

    desclen = device_descriptor[0]; // descriptor length

    pDdata = device_descriptor;

    break;

  case GD_CONFIGURATION:

    desclen = configuration_descriptor[2]; // Config descriptorincludes interface, HID, report and ep descriptors

    pDdata = configuration_descriptor;

    break;

  case GD_STRING:

    desclen = string_descriptor[SUD[wValueL]][0]; // wValueL=stringindex, array[0] is the length

    pDdata = string_descriptor[SUD[wValueL]]; // point to firstarray element

    break;

  case CS_INTERFACE:

    if(SUD[wIndexL]==0) // Interface Number=0. Del EndPoint 2(interrupción), Communication

    {

      //if(SUD[wLengthL]>configuration_descriptor[9])

      desclen = configuration_descriptor[9];

      //else desclen = SUD[wLengthL];

      pDdata = (BYTE *)&configuration_descriptor[9];

    }

    else if (SUD[wIndexL]==1) // InterfaceNumber=1. Del EndPoint 1 (bulk), Datos

    {

      //if(SUD[wLengthL]>configuration_descriptor[44])

      desclen = configuration_descriptor[44];

      //else desclen = SUD[wLengthL];

      pDdata = (BYTE *)&configuration_descriptor[44];

    }

    break;

    /* case GD_REPORT:

  desclen = configuration_descriptor[25];

  pDdata = report_descriptor;

  break;*/

  } // end switch on descriptor type

  if (desclen!=0)

  {

    sendlen = (reqlen <= desclen) ? reqlen : desclen;

    if(sendlen<=64) //if just one frame

    {

      Max_writebytes(rEP0FIFO,sendlen,pDdata);

      Max_wregAS(rEP0BC,sendlen);

    }

    else //if sendlen > 64, like your configuration descriptor,67 byte require 2 frame

    {

      do

      {

        sendlen = 64; //first time i send 64 bytes, because 67 = 64+ 3

        Max_writebytes(rEP0FIFO,sendlen,pDdata);

        Max_wreg(rEP0BC,sendlen);

        desclen=desclen-sendlen;

        pDdata=pDdata+sendlen;

      } while(desclen>64);

      sendlen = desclen;

      while(!Max_rreg(rEPIRQ& bmIN0BAVIRQ));

      if(sendlen>0) Max_writebytes(rEP0FIFO,sendlen,pDdata); //3 bytesmore

      Max_wregAS(rEP0BC,sendlen);

    }

  }

  else STALL_EP0 // none of the descriptor types match

}

void class_request(void)

{

  int i;

  switch (SUD[bRequest])

  {

  case SEND_ENCAPSULATED_COMMAND: Max_wregAS(rEP0BC, 0); break; // send_encapsulated_command(); break;

  case GET_ENCAPSULATED_RESPONSE: Max_wregAS(rEP0BC, 0); break; // send_encapsulated_command(); break; //get_encapsulated_response(); break;

  case SET_COMM_FEATURE: break;

  case GET_COMM_FEATURE: break;

  case CLEAR_COMM_FEATURE:break;

  case SET_LINE_CODING:

  {

    Max_wregAS(rEP0BC, 0);

    if(SUD[wLengthL]>0)

    {

      while(!(Max_rreg(rEPIRQ) & bmOUT0DAVIRQ) &&SUD[7]<=5) SUD[7]++;

      for(i=0;i<=SUD[wLengthL];)

        Max_readbytes(rEP0FIFO,SUD[wLengthL],(unsigned char *)&SUD[0]);

    }

  } break;

  case GET_LINE_CODING:

  {

    Max_wregAS(rEP0BC, 0);

    Max_writebytes(rEP0FIFO,SUD[wLengthL],(unsigned char*)&SerialConf[0]);

    Max_wreg(rEP0BC, SUD[wLengthL]);

  } break;

  case SET_CONTROL_LINE_STATE:

  {

    if(configval)

    {

      //Xps_SpiInit();

      if((SUD[wValueL]&0x01)==0x01)

        PC_DTR=1;

      if(SUD[wValueL]==0x00)

        PC_DTR=0;

    }

    Max_wregAS(rEP3INBC, 0);

  } break;

  case SEND_BREAK: break;

  default: STALL_EP0;

  }

}

void vendor_request(void)

{

  STALL_EP0

}

extern void Xps_SpiInit()   // Parmeters need to be Intialized

{

  XStatus status = XST_SUCCESS;

  status =      XSpi_Initialize(&mySPI, XPAR_SPI_0_DEVICE_ID );//XPAR_SPI_0_DEVICE_ID);

  switch(status)

  {

  case XST_SUCCESS: print("Status: Erfolgreich initialisiert\n\r");

  break;

  case XST_DEVICE_IS_STARTED: print("Status: Device is started\n\r");

  break;

  case XST_DEVICE_NOT_FOUND: print("Status: Device not found\n\r");

  break;

  }

  status =   XSpi_SetOptions(&mySPI, XSP_MASTER_OPTION );//XSP_MANUAL_SSELECT_OPTION

  //status   =  XSpi_SetSlaveSelect(&mySPI, 1);

  //status =   XSpi_SetOptions(&mySPI, XSP_CLK_ACTIVE_LOW_OPTION);

  status =    XSpi_Start(&mySPI);

}

extern void Xps_Spi_Max_Transmit(void)

{

}

extern void IntialiseMax3420E(void)

{

  ep3stall=0;      // EP3 inintially un-halted (no stall) (CH9 testing)

  msgidx = 0;      // start of KB Message[]

  inhibit_send = 0x01;    // 0 means send, 1 means inhibit sending

  send3zeros=1;

  msec_timer=0;

  blinktimer=0;

  // software flags

  configval=0;                    // at pwr on OR bus reset we're unconfigured

  Suspended=0;

  RWU_enabled=0;                  // Set by host Set_Feature(enable RWU) request

  //

     BYTE dum;

  //Xps_SpiInit();

  Max_wreg(rPINCTL,(bmFDUPSPI+bmINTLEVEL+gpxSOF)); // MX3420: SPI=full-duplex, INT=neg level, GPX=SOF

  data = Max_rreg(rPINCTL);

  //Max_wreg(rPINCTL,bmFDUPSPI);    // MAX3420: SPI=full-duplex

  Max_wreg(rUSBCTL,bmCHIPRES);    // reset the MAX3420E

  Max_wreg(rUSBCTL,0);// remove the reset

  //MAX_Reset();

  //Max_wreg(rGPIO,0x01);                   // lites off (Active HIGH)

  // This is a self-powered design, so the host could turn off Vbus while we are powered.

  // Therefore set the VBGATE bit to have the MAX3420E automatically disconnect the D+

  // pullup resistor in the absense of Vbus. Note: the VBCOMP pin must be connected to Vbus

  // or pulled high for this code to work--a low on VBCOMP will prevent USB connection.

  Max_wreg(rUSBCTL, (bmCONNECT));

  //ENABLE_IRQS;

  //Max_wreg(rCPUCTL,bmIE);                 // Enable the INT pin

}

extern void MAX_Reset(void)

{

  BYTE dum;

  Max_wreg(rUSBCTL,0x20);  // chip reset

  Max_wreg(rUSBCTL,0x00);  // remove the reset

  do                  // Chip reset stops the oscillator. Wait for it to stabilize.

  {

    dum = Max_rreg(rUSBIRQ);

    dum &= bmOSCOKIRQ;

  }

  while (dum==0);

}

extern void  Max_wreg(BYTE reg,BYTE val)              // write a MAX3420E register byte

{

  u8 spiWCmd = 0;

  XStatus status = XST_SUCCESS;

  status   =    XSpi_IntrGlobalDisable(&mySPI);

  status   =    XSpi_SetSlaveSelect(&mySPI, 0);

  spiWCmd  =    reg + 2;

  status   =    XSpi_Transfer(&mySPI,&spiWCmd,NULL,1);

  spiWCmd  =    val;

  status   =    XSpi_Transfer(&mySPI,&spiWCmd,NULL,1);

  switch(status)

  {

  case XST_SUCCESS :print("driver for transfer. Otherwise, returns:");

  break;

  case XST_DEVICE_IS_STOPPED : print("if the device must be started before transferring data.");

  break;

  case XST_DEVICE_BUSY : print(" indicates that a data transfer is already in  progress. This is determined by the driver.");

  break;

  case XST_SPI_NO_SLAVE : print( "indicates the device is configured as a  master and a slave has not yet been selected.");

  break;

  };

  status =    XSpi_SetSlaveSelect(&mySPI, 1);

  //status =    XSpi_IntrGlobalEnable(&mySPI);

}

extern BYTE Max_rreg(BYTE reg)

{

  BYTE dum;

  u8 spiRCmd = 0;

  XStatus status = XST_SUCCESS;

  status =    XSpi_IntrGlobalDisable(&mySPI);

  status = XSpi_SetSlaveSelect(&mySPI, 0);