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     //sleep(1);
 260
 261         // Reconnect USB reconnect
 262         AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;
 263         AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;
 264 }
 265
 266 //*----------------------------------------------------------------------------
 267 //* \fn    usb_check
 268 //* \brief Test if the device is configured and handle enumeration
 269 //*----------------------------------------------------------------------------
 270 bool usb_check() {
 271         AT91_REG isr = pUdp->UDP_ISR;
 272
 273         if (isr & AT91C_UDP_ENDBUSRES) {
 274                 pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;
 275                 // reset all endpoints
 276                 pUdp->UDP_RSTEP  = (unsigned int)-1;
 277                 pUdp->UDP_RSTEP  = 0;
 278                 // Enable the function
 279                 pUdp->UDP_FADDR = AT91C_UDP_FEN;
 280                 // Configure endpoint 0
 281                 pUdp->UDP_CSR[0] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);
 282         }
 283         else if (isr & AT91C_UDP_EPINT0) {
 284                 pUdp->UDP_ICR = AT91C_UDP_EPINT0;
 285                 AT91F_CDC_Enumerate();
 286         }
 287         return (btConfiguration) ? true : false;
 288 }
 289
 290
 291 bool usb_poll()
 292 {
 293   if (!usb_check()) return false;
 294   return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);
 295 }
 296
 297 /**
 298         In github PR #129, some users appears to get a false positive from
 299         usb_poll, which returns true, but the usb_read operation
 300         still returns 0.
 301         This check is basically the same as above, but also checks
 302         that the length available to read is non-zero, thus hopefully fixes the
 303         bug.
 304 **/
 305 bool usb_poll_validate_length()
 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
 330                         pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);
 331
 332                         if (bank == AT91C_UDP_RX_DATA_BK0)
 333                                 bank = AT91C_UDP_RX_DATA_BK1;
 334                         else
 335                                 bank = AT91C_UDP_RX_DATA_BK0;
 336                 }
 337                 if (time_out++ == 0x1fff) break;
 338         }
 339
 340         btReceiveBank = bank;
 341         return nbBytesRcv;
 342 }
 343
 344 //*----------------------------------------------------------------------------
 345 //* \fn    usb_write
 346 //* \brief Send through endpoint 2
 347 //*----------------------------------------------------------------------------
 348 uint32_t usb_write(const byte_t* data, const size_t len) {
 349         size_t length = len;
 350         uint32_t cpt = 0;
 351
 352         if (!length) return 0;
 353         if (!usb_check()) return 0;
 354
 355         // Send the first packet
 356         cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 357         length -= cpt;
 358         while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 359         pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 360
 361         while (length) {
 362                 // Fill the second bank
 363                 cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 364                 length -= cpt;
 365                 while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 366                 // Wait for the the first bank to be sent
 367                 while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 368                         if (!usb_check()) return length;
 369                 }
 370                 pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 371
 372                 while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 373
 374                 pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 375         }
 376
 377         // Wait for the end of transfer
 378         while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 379                 if (!usb_check()) return length;
 380         }
 381
 382         pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 383         while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 384
 385         return length;
 386 }
 387
 388 //*----------------------------------------------------------------------------
 389 //* \fn    AT91F_USB_SendData
 390 //* \brief Send Data through the control endpoint
 391 //*----------------------------------------------------------------------------
 392 unsigned int csrTab[100] = {0x00};
 393 unsigned char csrIdx = 0;
 394
 395 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {
 396         uint32_t cpt = 0;
 397         AT91_REG csr;
 398
 399         do {
 400                 cpt = MIN(length, 8);
 401                 length -= cpt;
 402
 403                 while (cpt--)
 404                         pUdp->UDP_FDR[0] = *pData++;
 405
 406                 if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 407                         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 408                         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 409                 }
 410
 411                 pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 412                 do {
 413                         csr = pUdp->UDP_CSR[0];
 414
 415                         // Data IN stage has been stopped by a status OUT
 416                         if (csr & AT91C_UDP_RX_DATA_BK0) {
 417                                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 418                                 return;
 419                         }
 420                 } while ( !(csr & AT91C_UDP_TXCOMP) );
 421
 422         } while (length);
 423
 424         if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 425                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 426                 while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 427         }
 428 }
 429
 430 //*----------------------------------------------------------------------------
 431 //* \fn    AT91F_USB_SendZlp
 432 //* \brief Send zero length packet through the control endpoint
 433 //*----------------------------------------------------------------------------
 434 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
 435         pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 436         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
 437         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 438         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 439 }
 440
 441 //*----------------------------------------------------------------------------
 442 //* \fn    AT91F_USB_SendStall
 443 //* \brief Stall the control endpoint
 444 //*----------------------------------------------------------------------------
 445 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {
 446         pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
 447         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
 448         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
 449         while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
 450 }
 451
 452 //*----------------------------------------------------------------------------
 453 //* \fn    AT91F_CDC_Enumerate
 454 //* \brief This function is a callback invoked when a SETUP packet is received
 455 //*----------------------------------------------------------------------------
 456 void AT91F_CDC_Enumerate() {
 457         byte_t bmRequestType, bRequest;
 458         uint16_t wValue, wIndex, wLength, wStatus;
 459
 460         if ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
 461                 return;
 462
 463         bmRequestType = pUdp->UDP_FDR[0];
 464         bRequest      = pUdp->UDP_FDR[0];
 465         wValue        = (pUdp->UDP_FDR[0] & 0xFF);
 466         wValue       |= (pUdp->UDP_FDR[0] << 8);
 467         wIndex        = (pUdp->UDP_FDR[0] & 0xFF);
 468         wIndex       |= (pUdp->UDP_FDR[0] << 8);
 469         wLength       = (pUdp->UDP_FDR[0] & 0xFF);
 470         wLength      |= (pUdp->UDP_FDR[0] << 8);
 471
 472         if (bmRequestType & 0x80) {
 473                 pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;
 474                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );
 475         }
 476         pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
 477         while ( (pUdp->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );
 478
 479         // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1
 480         switch ((bRequest << 8) | bmRequestType) {
 481         case STD_GET_DESCRIPTOR:
 482                 if (wValue == 0x100)       // Return Device Descriptor
 483                         AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));
 484                 else if (wValue == 0x200)  // Return Configuration Descriptor
 485                         AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
 486                 else if ((wValue & 0x300) == 0x300)  // Return String Descriptor
 487                         AT91F_USB_SendData(pUdp, strDescriptor, MIN(sizeof(strDescriptor), wLength));
 488                 else
 489                         AT91F_USB_SendStall(pUdp);
 490                 break;
 491         case STD_SET_ADDRESS:
 492                 AT91F_USB_SendZlp(pUdp);
 493                 pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);
 494                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;
 495                 break;
 496         case STD_SET_CONFIGURATION:
 497                 btConfiguration = wValue;
 498                 AT91F_USB_SendZlp(pUdp);
 499                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
 500                 pUdp->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
 501                 pUdp->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;
 502                 pUdp->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN)   : 0;
 503                 break;
 504         case STD_GET_CONFIGURATION:
 505                 AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));
 506                 break;
 507         case STD_GET_STATUS_ZERO:
 508                 wStatus = 0;
 509                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 510                 break;
 511         case STD_GET_STATUS_INTERFACE:
 512                 wStatus = 0;
 513                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 514                 break;
 515         case STD_GET_STATUS_ENDPOINT:
 516                 wStatus = 0;
 517                 wIndex &= 0x0F;
 518                 if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
 519                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 520                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 521                 }
 522                 else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
 523                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 524                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 525                 }
 526                 else
 527                         AT91F_USB_SendStall(pUdp);
 528                 break;
 529         case STD_SET_FEATURE_ZERO:
 530                 AT91F_USB_SendStall(pUdp);
 531             break;
 532         case STD_SET_FEATURE_INTERFACE:
 533                 AT91F_USB_SendZlp(pUdp);
 534                 break;
 535         case STD_SET_FEATURE_ENDPOINT:
 536                 wIndex &= 0x0F;
 537                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 538                         pUdp->UDP_CSR[wIndex] = 0;
 539                         AT91F_USB_SendZlp(pUdp);
 540                 }
 541                 else
 542                         AT91F_USB_SendStall(pUdp);
 543                 break;
 544         case STD_CLEAR_FEATURE_ZERO:
 545                 AT91F_USB_SendStall(pUdp);
 546             break;
 547         case STD_CLEAR_FEATURE_INTERFACE:
 548                 AT91F_USB_SendZlp(pUdp);
 549                 break;
 550         case STD_CLEAR_FEATURE_ENDPOINT:
 551                 wIndex &= 0x0F;
 552                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 553                         if (wIndex == 1)
 554                                 pUdp->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
 555                         else if (wIndex == 2)
 556                                 pUdp->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
 557                         else if (wIndex == 3)
 558                                 pUdp->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
 559                         AT91F_USB_SendZlp(pUdp);
 560                 }
 561                 else
 562                         AT91F_USB_SendStall(pUdp);
 563                 break;
 564
 565         // handle CDC class requests
 566         case SET_LINE_CODING:
 567                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
 568                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 569                 AT91F_USB_SendZlp(pUdp);
 570                 break;
 571         case GET_LINE_CODING:
 572                 AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));
 573                 break;
 574         case SET_CONTROL_LINE_STATE:
 575                 btConnection = wValue;
 576                 AT91F_USB_SendZlp(pUdp);
 577                 break;
 578         default:
 579                 AT91F_USB_SendStall(pUdp);
 580             break;
 581         }
 582 }