cvs.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
 227   // Clear all lingering interrupts
 228   if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {
 229     pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
 230   }
 231 }
 232
 233 //*----------------------------------------------------------------------------
 234 //* \fn    usb_enable
 235 //* \brief This function Activates the USB device
 236 //*----------------------------------------------------------------------------
 237 void usb_enable() {
 238   // Set the PLL USB Divider
 239   AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
 240
 241   // Specific Chip USB Initialisation
 242   // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock
 243   AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
 244   AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
 245
 246   // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO
 247   // Set in PIO mode and Configure in Output
 248   AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode
 249         AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output
 250
 251   // Clear for set the Pullup resistor
 252         AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;
 253
 254   // Disconnect and reconnect USB controller for 100ms
 255   usb_disable();
 256
 257   // Wait for a short while
 258   for (volatile size_t i=0; i<0x100000; i++);
 259
 260   // Reconnect USB reconnect
 261   AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;
 262   AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;
 263 }
 264
 265 //*----------------------------------------------------------------------------
 266 //* \fn    usb_check
 267 //* \brief Test if the device is configured and handle enumeration
 268 //*----------------------------------------------------------------------------
 269 bool usb_check() {
 270         AT91_REG isr = pUdp->UDP_ISR;
 271
 272         if (isr & AT91C_UDP_ENDBUSRES) {
 273                 pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
 274                 // reset all endpoints
 275                 pUdp->UDP_RSTEP  = (unsigned int)-1;
 276                 pUdp->UDP_RSTEP  = 0;
 277                 // Enable the function
 278                 pUdp->UDP_FADDR = AT91C_UDP_FEN;
 279                 // Configure endpoint 0
 280                 pUdp->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);
 281         }
 282         else if (isr & AT91C_UDP_EPINT0) {
 283                 pUdp->UDP_ICR = AT91C_UDP_EPINT0;
 284                 AT91F_CDC_Enumerate();
 285         }
 286         return (btConfiguration) ? true : false;
 287 }
 288
 289
 290 bool usb_poll()
 291 {
 292   if (!usb_check()) return false;
 293   return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);
 294 }
 295
 296 /**
 297         In github PR #129, some users appears to get a false positive from
 298         usb_poll, which returns true, but the usb_read operation
 299         still returns 0.
 300         This check is basically the same as above, but also checks
 301         that the length available to read is non-zero, thus hopefully fixes the
 302         bug.
 303 **/
 304 bool usb_poll_validate_length()
 305 {
 306
 307         if (!usb_check()) return false;
 308         if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;
 309         return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) >  0;
 310 }
 311
 312 //*----------------------------------------------------------------------------
 313 //* \fn    usb_read
 314 //* \brief Read available data from Endpoint OUT
 315 //*----------------------------------------------------------------------------
 316 uint32_t usb_read(byte_t* data, size_t len) {
 317         byte_t bank = btReceiveBank;
 318         uint32_t packetSize, nbBytesRcv = 0;
 319         uint32_t time_out = 0;
 320
 321         while (len)  {
 322                 if (!usb_check()) break;
 323
 324                 if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {
 325                         packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);
 326                         len -= packetSize;
 327                         while(packetSize--)
 328                                 data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];
 329                         pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);
 330                         if (bank == AT91C_UDP_RX_DATA_BK0) {
 331                                 bank = AT91C_UDP_RX_DATA_BK1;
 332                         } else {
 333                                 bank = AT91C_UDP_RX_DATA_BK0;
 334                         }
 335                 }
 336                 if (time_out++ == 0x1fff) break;
 337         }
 338
 339         btReceiveBank = bank;
 340         return nbBytesRcv;
 341 }
 342
 343 //*----------------------------------------------------------------------------
 344 //* \fn    usb_write
 345 //* \brief Send through endpoint 2
 346 //*----------------------------------------------------------------------------
 347 uint32_t usb_write(const byte_t* data, const size_t len) {
 348   size_t length = len;
 349         uint32_t cpt = 0;
 350
 351   if (!length) return 0;
 352   if (!usb_check()) return 0;
 353
 354         // Send the first packet
 355         cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 356         length -= cpt;
 357         while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 358         pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 359
 360         while (length) {
 361                 // Fill the second bank
 362                 cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 363                 length -= cpt;
 364                 while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 365                 // Wait for the first bank to be sent
 366                 while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 367                         if (!usb_check()) return length;
 368     }
 369                 pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 370                 while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 371                 pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 372         }
 373
 374         // Wait for the end of transfer
 375         while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 376                 if (!usb_check()) return length;
 377   }
 378
 379         pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 380         while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 381
 382         return length;
 383 }
 384
 385 //*----------------------------------------------------------------------------
 386 //* \fn    AT91F_USB_SendData
 387 //* \brief Send Data through the control endpoint
 388 //*----------------------------------------------------------------------------
 389 unsigned int csrTab[100] = {0x00};
 390 unsigned char csrIdx = 0;
 391
 392 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {
 393         uint32_t cpt = 0;
 394         AT91_REG csr;
 395
 396         do {
 397                 cpt = MIN(length, 8);
 398                 length -= cpt;
 399
 400                 while (cpt--)
 401                         pUdp->UDP_FDR[0] = *pData++;
 402
 403                 if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 404                         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 405                         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 406                 }
 407
 408                 pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 409                 do {
 410                         csr = pUdp->UDP_CSR[0];
 411
 412                         // Data IN stage has been stopped by a status OUT
 413                         if (csr & AT91C_UDP_RX_DATA_BK0) {
 414                                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 415                                 return;
 416                         }
 417                 } while ( !(csr & AT91C_UDP_TXCOMP) );
 418
 419         } while (length);
 420
 421         if (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 //*----------------------------------------------------------------------------
 428 //* \fn    AT91F_USB_SendZlp
 429 //* \brief Send zero length packet through the control endpoint
 430 //*----------------------------------------------------------------------------
 431 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
 432         pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 433         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
 434         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 435         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 436 }
 437
 438 //*----------------------------------------------------------------------------
 439 //* \fn    AT91F_USB_SendStall
 440 //* \brief Stall the control endpoint
 441 //*----------------------------------------------------------------------------
 442 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {
 443         pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
 444         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
 445         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
 446         while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
 447 }
 448
 449 //*----------------------------------------------------------------------------
 450 //* \fn    AT91F_CDC_Enumerate
 451 //* \brief This function is a callback invoked when a SETUP packet is received
 452 //*----------------------------------------------------------------------------
 453 void AT91F_CDC_Enumerate() {
 454         byte_t bmRequestType, bRequest;
 455         uint16_t wValue, wIndex, wLength, wStatus;
 456
 457         if ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
 458                 return;
 459
 460         bmRequestType = pUdp->UDP_FDR[0];
 461         bRequest      = pUdp->UDP_FDR[0];
 462         wValue        = (pUdp->UDP_FDR[0] & 0xFF);
 463         wValue       |= (pUdp->UDP_FDR[0] << 8);
 464         wIndex        = (pUdp->UDP_FDR[0] & 0xFF);
 465         wIndex       |= (pUdp->UDP_FDR[0] << 8);
 466         wLength       = (pUdp->UDP_FDR[0] & 0xFF);
 467         wLength      |= (pUdp->UDP_FDR[0] << 8);
 468
 469         if (bmRequestType & 0x80) {
 470                 pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;
 471                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );
 472         }
 473         pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
 474         while ( (pUdp->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );
 475
 476         // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1
 477         switch ((bRequest << 8) | bmRequestType) {
 478         case STD_GET_DESCRIPTOR:
 479                 if (wValue == 0x100)       // Return Device Descriptor
 480                         AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));
 481                 else if (wValue == 0x200)  // Return Configuration Descriptor
 482                         AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
 483                 else if ((wValue & 0x300) == 0x300)  // Return String Descriptor
 484                         AT91F_USB_SendData(pUdp, strDescriptor, MIN(sizeof(strDescriptor), wLength));
 485                 else
 486                         AT91F_USB_SendStall(pUdp);
 487                 break;
 488         case STD_SET_ADDRESS:
 489                 AT91F_USB_SendZlp(pUdp);
 490                 pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);
 491                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;
 492                 break;
 493         case STD_SET_CONFIGURATION:
 494                 btConfiguration = wValue;
 495                 AT91F_USB_SendZlp(pUdp);
 496                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
 497                 pUdp->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
 498                 pUdp->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;
 499                 pUdp->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN)   : 0;
 500                 break;
 501         case STD_GET_CONFIGURATION:
 502                 AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));
 503                 break;
 504         case STD_GET_STATUS_ZERO:
 505                 wStatus = 0;
 506                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 507                 break;
 508         case STD_GET_STATUS_INTERFACE:
 509                 wStatus = 0;
 510                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 511                 break;
 512         case STD_GET_STATUS_ENDPOINT:
 513                 wStatus = 0;
 514                 wIndex &= 0x0F;
 515                 if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
 516                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 517                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 518                 }
 519                 else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
 520                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 521                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 522                 }
 523                 else
 524                         AT91F_USB_SendStall(pUdp);
 525                 break;
 526         case STD_SET_FEATURE_ZERO:
 527                 AT91F_USB_SendStall(pUdp);
 528             break;
 529         case STD_SET_FEATURE_INTERFACE:
 530                 AT91F_USB_SendZlp(pUdp);
 531                 break;
 532         case STD_SET_FEATURE_ENDPOINT:
 533                 wIndex &= 0x0F;
 534                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 535                         pUdp->UDP_CSR[wIndex] = 0;
 536                         AT91F_USB_SendZlp(pUdp);
 537                 }
 538                 else
 539                         AT91F_USB_SendStall(pUdp);
 540                 break;
 541         case STD_CLEAR_FEATURE_ZERO:
 542                 AT91F_USB_SendStall(pUdp);
 543             break;
 544         case STD_CLEAR_FEATURE_INTERFACE:
 545                 AT91F_USB_SendZlp(pUdp);
 546                 break;
 547         case STD_CLEAR_FEATURE_ENDPOINT:
 548                 wIndex &= 0x0F;
 549                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 550                         if (wIndex == 1)
 551                                 pUdp->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
 552                         else if (wIndex == 2)
 553                                 pUdp->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
 554                         else if (wIndex == 3)
 555                                 pUdp->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
 556                         AT91F_USB_SendZlp(pUdp);
 557                 }
 558                 else
 559                         AT91F_USB_SendStall(pUdp);
 560                 break;
 561
 562         // handle CDC class requests
 563         case SET_LINE_CODING:
 564                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
 565                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 566                 AT91F_USB_SendZlp(pUdp);
 567                 break;
 568         case GET_LINE_CODING:
 569                 AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));
 570                 break;
 571         case SET_CONTROL_LINE_STATE:
 572                 btConnection = wValue;
 573                 AT91F_USB_SendZlp(pUdp);
 574                 break;
 575         default:
 576                 AT91F_USB_SendStall(pUdp);
 577             break;
 578         }
 579 }