git.zerfleddert.de Git - proxmark3-svn/blob - common/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 "config_gpio.h"
  37
  38 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  39 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  40 #define AT91C_EP_IN_SIZE  0x40
  41 #define AT91C_EP_OUT         1
  42 #define AT91C_EP_OUT_SIZE 0x40
  43 #define AT91C_EP_IN          2
  44
  45 const char devDescriptor[] = {
  46         /* Device descriptor */
  47         0x12,      // bLength
  48         0x01,      // bDescriptorType
  49         0x10,0x01, // Complies with USB Spec. Release (0110h = release 1.10)
  50         0x02,      // bDeviceClass:    CDC class code
  51         0x00,      // bDeviceSubclass: CDC class sub code
  52         0x00,      // bDeviceProtocol: CDC Device protocol
  53         0x08,      // bMaxPacketSize0
  54         0x2d,0x2d, // Vendor ID (--)
  55         0x4d,0x50, // Product ID (PM), transmitted in reverse
  56         0x01,0x00, // Device release number (0001)
  57         0x01,      // iManufacturer    // 0x01
  58         0x00,      // iProduct
  59         0x00,      // SerialNumber
  60         0x01       // bNumConfigs
  61 };
  62
  63 const char cfgDescriptor[] = {
  64         /* ============== CONFIGURATION 1 =========== */
  65         /* Configuration 1 descriptor */
  66         0x09,   // CbLength
  67         0x02,   // CbDescriptorType
  68         0x43,   // CwTotalLength 2 EP + Control
  69         0x00,
  70         0x02,   // CbNumInterfaces
  71         0x01,   // CbConfigurationValue
  72         0x00,   // CiConfiguration
  73         0xC0,   // CbmAttributes 0xA0
  74         0x00,   // CMaxPower
  75
  76         /* Communication Class Interface Descriptor Requirement */
  77         0x09, // bLength
  78         0x04, // bDescriptorType
  79         0x00, // bInterfaceNumber
  80         0x00, // bAlternateSetting
  81         0x01, // bNumEndpoints
  82         0x02, // bInterfaceClass
  83         0x02, // bInterfaceSubclass
  84         0x00, // bInterfaceProtocol
  85         0x00, // iInterface
  86
  87         /* Header Functional Descriptor */
  88         0x05, // bFunction Length
  89         0x24, // bDescriptor type: CS_INTERFACE
  90         0x00, // bDescriptor subtype: Header Func Desc
  91         0x10, // bcdCDC:1.1
  92         0x01,
  93
  94         /* ACM Functional Descriptor */
  95         0x04, // bFunctionLength
  96         0x24, // bDescriptor Type: CS_INTERFACE
  97         0x02, // bDescriptor Subtype: ACM Func Desc
  98         0x00, // bmCapabilities
  99
 100         /* Union Functional Descriptor */
 101         0x05, // bFunctionLength
 102         0x24, // bDescriptorType: CS_INTERFACE
 103         0x06, // bDescriptor Subtype: Union Func Desc
 104         0x00, // bMasterInterface: Communication Class Interface
 105         0x01, // bSlaveInterface0: Data Class Interface
 106
 107         /* Call Management Functional Descriptor */
 108         0x05, // bFunctionLength
 109         0x24, // bDescriptor Type: CS_INTERFACE
 110         0x01, // bDescriptor Subtype: Call Management Func Desc
 111         0x00, // bmCapabilities: D1 + D0
 112         0x01, // bDataInterface: Data Class Interface 1
 113
 114         /* Endpoint 1 descriptor */
 115         0x07,   // bLength
 116         0x05,   // bDescriptorType
 117         0x83,   // bEndpointAddress, Endpoint 03 - IN
 118         0x03,   // bmAttributes      INT
 119         0x08,   // wMaxPacketSize
 120         0x00,
 121         0xFF,   // bInterval
 122
 123         /* Data Class Interface Descriptor Requirement */
 124         0x09, // bLength
 125         0x04, // bDescriptorType
 126         0x01, // bInterfaceNumber
 127         0x00, // bAlternateSetting
 128         0x02, // bNumEndpoints
 129         0x0A, // bInterfaceClass
 130         0x00, // bInterfaceSubclass
 131         0x00, // bInterfaceProtocol
 132         0x00, // iInterface
 133
 134         /* First alternate setting */
 135         /* Endpoint 1 descriptor */
 136         0x07,   // bLength
 137         0x05,   // bDescriptorType
 138         0x01,   // bEndpointAddress, Endpoint 01 - OUT
 139         0x02,   // bmAttributes      BULK
 140         AT91C_EP_OUT_SIZE,   // wMaxPacketSize
 141         0x00,
 142         0x00,   // bInterval
 143
 144         /* Endpoint 2 descriptor */
 145         0x07,   // bLength
 146         0x05,   // bDescriptorType
 147         0x82,   // bEndpointAddress, Endpoint 02 - IN
 148         0x02,   // bmAttributes      BULK
 149         AT91C_EP_IN_SIZE,   // wMaxPacketSize
 150         0x00,
 151         0x00    // bInterval
 152 };
 153
 154 const char strDescriptor[] = {
 155   26,                           // Length
 156   0x03,                 // Type is string
 157   'p', 0x00,
 158   'r', 0x00,
 159   'o', 0x00,
 160   'x', 0x00,
 161   'm', 0x00,
 162   'a', 0x00,
 163   'r', 0x00,
 164   'k', 0x00,
 165   '.', 0x00,
 166   'o', 0x00,
 167   'r', 0x00,
 168   'g', 0x00,
 169 };
 170
 171
 172 /* USB standard request code */
 173 #define STD_GET_STATUS_ZERO           0x0080
 174 #define STD_GET_STATUS_INTERFACE      0x0081
 175 #define STD_GET_STATUS_ENDPOINT       0x0082
 176
 177 #define STD_CLEAR_FEATURE_ZERO        0x0100
 178 #define STD_CLEAR_FEATURE_INTERFACE   0x0101
 179 #define STD_CLEAR_FEATURE_ENDPOINT    0x0102
 180
 181 #define STD_SET_FEATURE_ZERO          0x0300
 182 #define STD_SET_FEATURE_INTERFACE     0x0301
 183 #define STD_SET_FEATURE_ENDPOINT      0x0302
 184
 185 #define STD_SET_ADDRESS               0x0500
 186 #define STD_GET_DESCRIPTOR            0x0680
 187 #define STD_SET_DESCRIPTOR            0x0700
 188 #define STD_GET_CONFIGURATION         0x0880
 189 #define STD_SET_CONFIGURATION         0x0900
 190 #define STD_GET_INTERFACE             0x0A81
 191 #define STD_SET_INTERFACE             0x0B01
 192 #define STD_SYNCH_FRAME               0x0C82
 193
 194 /* CDC Class Specific Request Code */
 195 #define GET_LINE_CODING               0x21A1
 196 #define SET_LINE_CODING               0x2021
 197 #define SET_CONTROL_LINE_STATE        0x2221
 198
 199 typedef struct {
 200         unsigned int dwDTERRate;
 201         char bCharFormat;
 202         char bParityType;
 203         char bDataBits;
 204 } AT91S_CDC_LINE_CODING, *AT91PS_CDC_LINE_CODING;
 205
 206 AT91S_CDC_LINE_CODING line = {
 207         115200, // baudrate
 208         0,      // 1 Stop Bit
 209         0,      // None Parity
 210         8};     // 8 Data bits
 211
 212 void AT91F_CDC_Enumerate();
 213
 214 AT91PS_UDP pUdp = AT91C_BASE_UDP;
 215 byte_t btConfiguration = 0;
 216 byte_t btConnection    = 0;
 217 byte_t btReceiveBank   = AT91C_UDP_RX_DATA_BK0;
 218
 219 //*----------------------------------------------------------------------------
 220 //* \fn    usb_disable
 221 //* \brief This function deactivates the USB device
 222 //*----------------------------------------------------------------------------
 223 void usb_disable() {
 224   // Disconnect the USB device
 225   AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;
 226 //  SpinDelay(100);
 227
 228   // Clear all lingering interrupts
 229   if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {
 230     pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
 231   }
 232 }
 233
 234 //*----------------------------------------------------------------------------
 235 //* \fn    usb_enable
 236 //* \brief This function Activates the USB device
 237 //*----------------------------------------------------------------------------
 238 void usb_enable() {
 239   // Set the PLL USB Divider
 240   AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
 241
 242   // Specific Chip USB Initialisation
 243   // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock
 244   AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
 245   AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
 246
 247   // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO
 248   // Set in PIO mode and Configure in Output
 249   AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode
 250         AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output
 251
 252   // Clear for set the Pullup resistor
 253         AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;
 254
 255   // Disconnect and reconnect USB controller for 100ms
 256   usb_disable();
 257
 258   // Wait for a short while
 259   for (volatile size_t i=0; i<0x100000; i++);
 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 }