git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/usb_cdc.c

   1 /*
   2  * at91sam7s USB CDC device implementation
   3  *
   4  * Copyright (c) 2012, Roel Verdult
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the copyright holders nor the
  15  * names of its contributors may be used to endorse or promote products
  16  * derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * based on the "Basic USB Example" from ATMEL (doc6123.pdf)
  30  *
  31  * @file usb_cdc.c
  32  * @brief
  33  */
  34
  35 #include "usb_cdc.h"
  36 #include "util.h"
  37 #include "config_gpio.h"
  38
  39 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  40 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  41 #define AT91C_EP_IN_SIZE  0x40
  42 #define AT91C_EP_OUT         1
  43 #define AT91C_EP_OUT_SIZE 0x40
  44 #define AT91C_EP_IN          2
  45
  46 const char devDescriptor[] = {
  47         /* Device descriptor */
  48         0x12,      // bLength
  49         0x01,      // bDescriptorType
  50         0x10,0x01, // Complies with USB Spec. Release (0110h = release 1.10)
  51         0x02,      // bDeviceClass:    CDC class code
  52         0x00,      // bDeviceSubclass: CDC class sub code
  53         0x00,      // bDeviceProtocol: CDC Device protocol
  54         0x08,      // bMaxPacketSize0
  55         0x2d,0x2d, // Vendor ID (--)
  56         0x4d,0x50, // Product ID (PM), transmitted in reverse
  57         0x01,0x00, // Device release number (0001)
  58         0x01,      // iManufacturer    // 0x01
  59         0x00,      // iProduct
  60         0x00,      // SerialNumber
  61         0x01       // bNumConfigs
  62 };
  63
  64 const char cfgDescriptor[] = {
  65         /* ============== CONFIGURATION 1 =========== */
  66         /* Configuration 1 descriptor */
  67         0x09,   // CbLength
  68         0x02,   // CbDescriptorType
  69         0x43,   // CwTotalLength 2 EP + Control
  70         0x00,
  71         0x02,   // CbNumInterfaces
  72         0x01,   // CbConfigurationValue
  73         0x00,   // CiConfiguration
  74         0xC0,   // CbmAttributes 0xA0
  75         0x00,   // CMaxPower
  76
  77         /* Communication Class Interface Descriptor Requirement */
  78         0x09, // bLength
  79         0x04, // bDescriptorType
  80         0x00, // bInterfaceNumber
  81         0x00, // bAlternateSetting
  82         0x01, // bNumEndpoints
  83         0x02, // bInterfaceClass
  84         0x02, // bInterfaceSubclass
  85         0x00, // bInterfaceProtocol
  86         0x00, // iInterface
  87
  88         /* Header Functional Descriptor */
  89         0x05, // bFunction Length
  90         0x24, // bDescriptor type: CS_INTERFACE
  91         0x00, // bDescriptor subtype: Header Func Desc
  92         0x10, // bcdCDC:1.1
  93         0x01,
  94
  95         /* ACM Functional Descriptor */
  96         0x04, // bFunctionLength
  97         0x24, // bDescriptor Type: CS_INTERFACE
  98         0x02, // bDescriptor Subtype: ACM Func Desc
  99         0x00, // bmCapabilities
 100
 101         /* Union Functional Descriptor */
 102         0x05, // bFunctionLength
 103         0x24, // bDescriptorType: CS_INTERFACE
 104         0x06, // bDescriptor Subtype: Union Func Desc
 105         0x00, // bMasterInterface: Communication Class Interface
 106         0x01, // bSlaveInterface0: Data Class Interface
 107
 108         /* Call Management Functional Descriptor */
 109         0x05, // bFunctionLength
 110         0x24, // bDescriptor Type: CS_INTERFACE
 111         0x01, // bDescriptor Subtype: Call Management Func Desc
 112         0x00, // bmCapabilities: D1 + D0
 113         0x01, // bDataInterface: Data Class Interface 1
 114
 115         /* Endpoint 1 descriptor */
 116         0x07,   // bLength
 117         0x05,   // bDescriptorType
 118         0x83,   // bEndpointAddress, Endpoint 03 - IN
 119         0x03,   // bmAttributes      INT
 120         0x08,   // wMaxPacketSize
 121         0x00,
 122         0xFF,   // bInterval
 123
 124         /* Data Class Interface Descriptor Requirement */
 125         0x09, // bLength
 126         0x04, // bDescriptorType
 127         0x01, // bInterfaceNumber
 128         0x00, // bAlternateSetting
 129         0x02, // bNumEndpoints
 130         0x0A, // bInterfaceClass
 131         0x00, // bInterfaceSubclass
 132         0x00, // bInterfaceProtocol
 133         0x00, // iInterface
 134
 135         /* First alternate setting */
 136         /* Endpoint 1 descriptor */
 137         0x07,   // bLength
 138         0x05,   // bDescriptorType
 139         0x01,   // bEndpointAddress, Endpoint 01 - OUT
 140         0x02,   // bmAttributes      BULK
 141         AT91C_EP_OUT_SIZE,   // wMaxPacketSize
 142         0x00,
 143         0x00,   // bInterval
 144
 145         /* Endpoint 2 descriptor */
 146         0x07,   // bLength
 147         0x05,   // bDescriptorType
 148         0x82,   // bEndpointAddress, Endpoint 02 - IN
 149         0x02,   // bmAttributes      BULK
 150         AT91C_EP_IN_SIZE,   // wMaxPacketSize
 151         0x00,
 152         0x00    // bInterval
 153 };
 154
 155 const char strDescriptor[] = {
 156   26,                           // Length
 157   0x03,                 // Type is string
 158   'p', 0x00,
 159   'r', 0x00,
 160   'o', 0x00,
 161   'x', 0x00,
 162   'm', 0x00,
 163   'a', 0x00,
 164   'r', 0x00,
 165   'k', 0x00,
 166   '.', 0x00,
 167   'o', 0x00,
 168   'r', 0x00,
 169   'g', 0x00,
 170 };
 171
 172
 173 /* USB standard request code */
 174 #define STD_GET_STATUS_ZERO           0x0080
 175 #define STD_GET_STATUS_INTERFACE      0x0081
 176 #define STD_GET_STATUS_ENDPOINT       0x0082
 177
 178 #define STD_CLEAR_FEATURE_ZERO        0x0100
 179 #define STD_CLEAR_FEATURE_INTERFACE   0x0101
 180 #define STD_CLEAR_FEATURE_ENDPOINT    0x0102
 181
 182 #define STD_SET_FEATURE_ZERO          0x0300
 183 #define STD_SET_FEATURE_INTERFACE     0x0301
 184 #define STD_SET_FEATURE_ENDPOINT      0x0302
 185
 186 #define STD_SET_ADDRESS               0x0500
 187 #define STD_GET_DESCRIPTOR            0x0680
 188 #define STD_SET_DESCRIPTOR            0x0700
 189 #define STD_GET_CONFIGURATION         0x0880
 190 #define STD_SET_CONFIGURATION         0x0900
 191 #define STD_GET_INTERFACE             0x0A81
 192 #define STD_SET_INTERFACE             0x0B01
 193 #define STD_SYNCH_FRAME               0x0C82
 194
 195 /* CDC Class Specific Request Code */
 196 #define GET_LINE_CODING               0x21A1
 197 #define SET_LINE_CODING               0x2021
 198 #define SET_CONTROL_LINE_STATE        0x2221
 199
 200 typedef struct {
 201         unsigned int dwDTERRate;
 202         char bCharFormat;
 203         char bParityType;
 204         char bDataBits;
 205 } AT91S_CDC_LINE_CODING, *AT91PS_CDC_LINE_CODING;
 206
 207 AT91S_CDC_LINE_CODING line = {
 208         115200, // baudrate
 209         0,      // 1 Stop Bit
 210         0,      // None Parity
 211         8};     // 8 Data bits
 212
 213 void AT91F_CDC_Enumerate();
 214
 215 AT91PS_UDP pUdp = AT91C_BASE_UDP;
 216 byte_t btConfiguration = 0;
 217 byte_t btConnection    = 0;
 218 byte_t btReceiveBank   = AT91C_UDP_RX_DATA_BK0;
 219
 220 //*----------------------------------------------------------------------------
 221 //* \fn    usb_disable
 222 //* \brief This function deactivates the USB device
 223 //*----------------------------------------------------------------------------
 224 void usb_disable() {
 225   // Disconnect the USB device
 226   AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;
 227   SpinDelay(100);
 228
 229   // Clear all lingering interrupts
 230   if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {
 231     pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
 232   }
 233 }
 234
 235 //*----------------------------------------------------------------------------
 236 //* \fn    usb_enable
 237 //* \brief This function Activates the USB device
 238 //*----------------------------------------------------------------------------
 239 void usb_enable() {
 240   // Set the PLL USB Divider
 241   AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
 242
 243   // Specific Chip USB Initialisation
 244   // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock
 245   AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
 246   AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
 247
 248   // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO
 249   // Set in PIO mode and Configure in Output
 250   AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode
 251         AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output
 252
 253   // Clear for set the Pullup resistor
 254         AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;
 255
 256   // Disconnect and reconnect USB controller for 100ms
 257   usb_disable();
 258
 259   // Wait for a short while
 260   SpinDelay(100);
 261
 262   // Reconnect USB reconnect
 263   AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;
 264   AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;
 265 }
 266
 267 //*----------------------------------------------------------------------------
 268 //* \fn    usb_check
 269 //* \brief Test if the device is configured and handle enumeration
 270 //*----------------------------------------------------------------------------
 271 bool usb_check() {
 272         AT91_REG isr = pUdp->UDP_ISR;
 273
 274         if (isr & AT91C_UDP_ENDBUSRES) {
 275                 pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
 276                 // reset all endpoints
 277                 pUdp->UDP_RSTEP  = (unsigned int)-1;
 278                 pUdp->UDP_RSTEP  = 0;
 279                 // Enable the function
 280                 pUdp->UDP_FADDR = AT91C_UDP_FEN;
 281                 // Configure endpoint 0
 282                 pUdp->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);
 283         }
 284         else if (isr & AT91C_UDP_EPINT0) {
 285                 pUdp->UDP_ICR = AT91C_UDP_EPINT0;
 286                 AT91F_CDC_Enumerate();
 287         }
 288         return (btConfiguration) ? true : false;
 289 }
 290
 291
 292 bool usb_poll()
 293 {
 294   if (!usb_check()) return false;
 295   return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);
 296 }
 297
 298 //*----------------------------------------------------------------------------
 299 //* \fn    usb_read
 300 //* \brief Read available data from Endpoint OUT
 301 //*----------------------------------------------------------------------------
 302 uint32_t usb_read(byte_t* data, size_t len) {
 303   byte_t bank = btReceiveBank;
 304         uint32_t packetSize, nbBytesRcv = 0;
 305   uint32_t time_out = 0;
 306
 307         while (len)
 308   {
 309                 if (!usb_check()) break;
 310
 311                 if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {
 312                         packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);
 313       len -= packetSize;
 314                         while(packetSize--)
 315                                 data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];
 316                         pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);
 317                         if (bank == AT91C_UDP_RX_DATA_BK0)
 318       {
 319                                 bank = AT91C_UDP_RX_DATA_BK1;
 320       } else {
 321                                 bank = AT91C_UDP_RX_DATA_BK0;
 322       }
 323                 }
 324     if (time_out++ == 0x1fff) break;
 325         }
 326
 327         btReceiveBank = bank;
 328         return nbBytesRcv;
 329 }
 330
 331 //*----------------------------------------------------------------------------
 332 //* \fn    usb_write
 333 //* \brief Send through endpoint 2
 334 //*----------------------------------------------------------------------------
 335 uint32_t usb_write(const byte_t* data, const size_t len) {
 336   size_t length = len;
 337         uint32_t cpt = 0;
 338
 339   if (!length) return 0;
 340   if (!usb_check()) return 0;
 341
 342         // Send the first packet
 343         cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 344         length -= cpt;
 345         while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 346         pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 347
 348         while (length) {
 349                 // Fill the second bank
 350                 cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 351                 length -= cpt;
 352                 while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 353                 // Wait for the the first bank to be sent
 354                 while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 355                         if (!usb_check()) return length;
 356     }
 357                 pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 358                 while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 359                 pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 360         }
 361
 362         // Wait for the end of transfer
 363         while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 364                 if (!usb_check()) return length;
 365   }
 366
 367         pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 368         while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 369
 370         return length;
 371 }
 372
 373 //*----------------------------------------------------------------------------
 374 //* \fn    AT91F_USB_SendData
 375 //* \brief Send Data through the control endpoint
 376 //*----------------------------------------------------------------------------
 377 unsigned int csrTab[100];
 378 unsigned char csrIdx = 0;
 379
 380 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {
 381         uint32_t cpt = 0;
 382         AT91_REG csr;
 383
 384         do {
 385                 cpt = MIN(length, 8);
 386                 length -= cpt;
 387
 388                 while (cpt--)
 389                         pUdp->UDP_FDR[0] = *pData++;
 390
 391                 if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 392                         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 393                         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 394                 }
 395
 396                 pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 397                 do {
 398                         csr = pUdp->UDP_CSR[0];
 399
 400                         // Data IN stage has been stopped by a status OUT
 401                         if (csr & AT91C_UDP_RX_DATA_BK0) {
 402                                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 403                                 return;
 404                         }
 405                 } while ( !(csr & AT91C_UDP_TXCOMP) );
 406
 407         } while (length);
 408
 409         if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 410                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 411                 while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 412         }
 413 }
 414
 415 //*----------------------------------------------------------------------------
 416 //* \fn    AT91F_USB_SendZlp
 417 //* \brief Send zero length packet through the control endpoint
 418 //*----------------------------------------------------------------------------
 419 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
 420         pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 421         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
 422         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 423         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 424 }
 425
 426 //*----------------------------------------------------------------------------
 427 //* \fn    AT91F_USB_SendStall
 428 //* \brief Stall the control endpoint
 429 //*----------------------------------------------------------------------------
 430 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {
 431         pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
 432         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
 433         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
 434         while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
 435 }
 436
 437 //*----------------------------------------------------------------------------
 438 //* \fn    AT91F_CDC_Enumerate
 439 //* \brief This function is a callback invoked when a SETUP packet is received
 440 //*----------------------------------------------------------------------------
 441 void AT91F_CDC_Enumerate() {
 442         byte_t bmRequestType, bRequest;
 443         uint16_t wValue, wIndex, wLength, wStatus;
 444
 445         if ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
 446                 return;
 447
 448         bmRequestType = pUdp->UDP_FDR[0];
 449         bRequest      = pUdp->UDP_FDR[0];
 450         wValue        = (pUdp->UDP_FDR[0] & 0xFF);
 451         wValue       |= (pUdp->UDP_FDR[0] << 8);
 452         wIndex        = (pUdp->UDP_FDR[0] & 0xFF);
 453         wIndex       |= (pUdp->UDP_FDR[0] << 8);
 454         wLength       = (pUdp->UDP_FDR[0] & 0xFF);
 455         wLength      |= (pUdp->UDP_FDR[0] << 8);
 456
 457         if (bmRequestType & 0x80) {
 458                 pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;
 459                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );
 460         }
 461         pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
 462         while ( (pUdp->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );
 463
 464         // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1
 465         switch ((bRequest << 8) | bmRequestType) {
 466         case STD_GET_DESCRIPTOR:
 467                 if (wValue == 0x100)       // Return Device Descriptor
 468                         AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));
 469                 else if (wValue == 0x200)  // Return Configuration Descriptor
 470                         AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
 471                 else if ((wValue & 0x300) == 0x300)  // Return String Descriptor
 472                         AT91F_USB_SendData(pUdp, strDescriptor, MIN(sizeof(strDescriptor), wLength));
 473                 else
 474                         AT91F_USB_SendStall(pUdp);
 475                 break;
 476         case STD_SET_ADDRESS:
 477                 AT91F_USB_SendZlp(pUdp);
 478                 pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);
 479                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;
 480                 break;
 481         case STD_SET_CONFIGURATION:
 482                 btConfiguration = wValue;
 483                 AT91F_USB_SendZlp(pUdp);
 484                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
 485                 pUdp->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
 486                 pUdp->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;
 487                 pUdp->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN)   : 0;
 488                 break;
 489         case STD_GET_CONFIGURATION:
 490                 AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));
 491                 break;
 492         case STD_GET_STATUS_ZERO:
 493                 wStatus = 0;
 494                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 495                 break;
 496         case STD_GET_STATUS_INTERFACE:
 497                 wStatus = 0;
 498                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 499                 break;
 500         case STD_GET_STATUS_ENDPOINT:
 501                 wStatus = 0;
 502                 wIndex &= 0x0F;
 503                 if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
 504                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 505                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 506                 }
 507                 else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
 508                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 509                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 510                 }
 511                 else
 512                         AT91F_USB_SendStall(pUdp);
 513                 break;
 514         case STD_SET_FEATURE_ZERO:
 515                 AT91F_USB_SendStall(pUdp);
 516             break;
 517         case STD_SET_FEATURE_INTERFACE:
 518                 AT91F_USB_SendZlp(pUdp);
 519                 break;
 520         case STD_SET_FEATURE_ENDPOINT:
 521                 wIndex &= 0x0F;
 522                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 523                         pUdp->UDP_CSR[wIndex] = 0;
 524                         AT91F_USB_SendZlp(pUdp);
 525                 }
 526                 else
 527                         AT91F_USB_SendStall(pUdp);
 528                 break;
 529         case STD_CLEAR_FEATURE_ZERO:
 530                 AT91F_USB_SendStall(pUdp);
 531             break;
 532         case STD_CLEAR_FEATURE_INTERFACE:
 533                 AT91F_USB_SendZlp(pUdp);
 534                 break;
 535         case STD_CLEAR_FEATURE_ENDPOINT:
 536                 wIndex &= 0x0F;
 537                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 538                         if (wIndex == 1)
 539                                 pUdp->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
 540                         else if (wIndex == 2)
 541                                 pUdp->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
 542                         else if (wIndex == 3)
 543                                 pUdp->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
 544                         AT91F_USB_SendZlp(pUdp);
 545                 }
 546                 else
 547                         AT91F_USB_SendStall(pUdp);
 548                 break;
 549
 550         // handle CDC class requests
 551         case SET_LINE_CODING:
 552                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
 553                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 554                 AT91F_USB_SendZlp(pUdp);
 555                 break;
 556         case GET_LINE_CODING:
 557                 AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));
 558                 break;
 559         case SET_CONTROL_LINE_STATE:
 560                 btConnection = wValue;
 561                 AT91F_USB_SendZlp(pUdp);
 562                 break;
 563         default:
 564                 AT91F_USB_SendStall(pUdp);
 565             break;
 566         }
 567 }