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
 308         if (!usb_check()) return false;
 309         if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;
 310         return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) >  0;
 311 }
 312
 313 //*----------------------------------------------------------------------------
 314 //* \fn    usb_read
 315 //* \brief Read available data from Endpoint OUT
 316 //*----------------------------------------------------------------------------
 317 uint32_t usb_read(byte_t* data, size_t len) {
 318         byte_t bank = btReceiveBank;
 319         uint32_t packetSize, nbBytesRcv = 0;
 320         uint32_t time_out = 0;
 321
 322         while (len)  {
 323                 if (!usb_check()) break;
 324
 325                 if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {
 326                         packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);
 327                         len -= packetSize;
 328                         while(packetSize--)
 329                                 data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];
 330
 331                         pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(bank);
 332
 333                         if (bank == AT91C_UDP_RX_DATA_BK0)
 334                                 bank = AT91C_UDP_RX_DATA_BK1;
 335                         else
 336                                 bank = AT91C_UDP_RX_DATA_BK0;
 337                 }
 338                 if (time_out++ == 0x1fff) break;
 339         }
 340
 341         btReceiveBank = bank;
 342         return nbBytesRcv;
 343 }
 344
 345 //*----------------------------------------------------------------------------
 346 //* \fn    usb_write
 347 //* \brief Send through endpoint 2
 348 //*----------------------------------------------------------------------------
 349 uint32_t usb_write(const byte_t* data, const size_t len) {
 350         size_t length = len;
 351         uint32_t cpt = 0;
 352
 353         if (!length) return 0;
 354         if (!usb_check()) return 0;
 355
 356         // Send the first packet
 357         cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 358         length -= cpt;
 359         while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 360         pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 361
 362         while (length) {
 363                 // Fill the second bank
 364                 cpt = MIN(length, AT91C_EP_IN_SIZE-1);
 365                 length -= cpt;
 366                 while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *data++;
 367                 // Wait for the the first bank to be sent
 368                 while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 369                         if (!usb_check()) return length;
 370                 }
 371                 pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 372
 373                 while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 374
 375                 pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
 376         }
 377
 378         // Wait for the end of transfer
 379         while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {
 380                 if (!usb_check()) return length;
 381         }
 382
 383         pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
 384         while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
 385
 386         return length;
 387 }
 388
 389 //*----------------------------------------------------------------------------
 390 //* \fn    AT91F_USB_SendData
 391 //* \brief Send Data through the control endpoint
 392 //*----------------------------------------------------------------------------
 393 unsigned int csrTab[100] = {0x00};
 394 unsigned char csrIdx = 0;
 395
 396 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {
 397         uint32_t cpt = 0;
 398         AT91_REG csr;
 399
 400         do {
 401                 cpt = MIN(length, 8);
 402                 length -= cpt;
 403
 404                 while (cpt--)
 405                         pUdp->UDP_FDR[0] = *pData++;
 406
 407                 if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 408                         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 409                         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 410                 }
 411
 412                 pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 413                 do {
 414                         csr = pUdp->UDP_CSR[0];
 415
 416                         // Data IN stage has been stopped by a status OUT
 417                         if (csr & AT91C_UDP_RX_DATA_BK0) {
 418                                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 419                                 return;
 420                         }
 421                 } while ( !(csr & AT91C_UDP_TXCOMP) );
 422
 423         } while (length);
 424
 425         if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
 426                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 427                 while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 428         }
 429 }
 430
 431 //*----------------------------------------------------------------------------
 432 //* \fn    AT91F_USB_SendZlp
 433 //* \brief Send zero length packet through the control endpoint
 434 //*----------------------------------------------------------------------------
 435 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {
 436         pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
 437         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
 438         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
 439         while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
 440 }
 441
 442 //*----------------------------------------------------------------------------
 443 //* \fn    AT91F_USB_SendStall
 444 //* \brief Stall the control endpoint
 445 //*----------------------------------------------------------------------------
 446 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {
 447         pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
 448         while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
 449         pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
 450         while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
 451 }
 452
 453 //*----------------------------------------------------------------------------
 454 //* \fn    AT91F_CDC_Enumerate
 455 //* \brief This function is a callback invoked when a SETUP packet is received
 456 //*----------------------------------------------------------------------------
 457 void AT91F_CDC_Enumerate() {
 458         byte_t bmRequestType, bRequest;
 459         uint16_t wValue, wIndex, wLength, wStatus;
 460
 461         if ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
 462                 return;
 463
 464         bmRequestType = pUdp->UDP_FDR[0];
 465         bRequest      = pUdp->UDP_FDR[0];
 466         wValue        = (pUdp->UDP_FDR[0] & 0xFF);
 467         wValue       |= (pUdp->UDP_FDR[0] << 8);
 468         wIndex        = (pUdp->UDP_FDR[0] & 0xFF);
 469         wIndex       |= (pUdp->UDP_FDR[0] << 8);
 470         wLength       = (pUdp->UDP_FDR[0] & 0xFF);
 471         wLength      |= (pUdp->UDP_FDR[0] << 8);
 472
 473         if (bmRequestType & 0x80) {
 474                 pUdp->UDP_CSR[0] |= AT91C_UDP_DIR;
 475                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_DIR) );
 476         }
 477         pUdp->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
 478         while ( (pUdp->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );
 479
 480         // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1
 481         switch ((bRequest << 8) | bmRequestType) {
 482         case STD_GET_DESCRIPTOR:
 483                 if (wValue == 0x100)       // Return Device Descriptor
 484                         AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));
 485                 else if (wValue == 0x200)  // Return Configuration Descriptor
 486                         AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
 487                 else if ((wValue & 0x300) == 0x300)  // Return String Descriptor
 488                         AT91F_USB_SendData(pUdp, strDescriptor, MIN(sizeof(strDescriptor), wLength));
 489                 else
 490                         AT91F_USB_SendStall(pUdp);
 491                 break;
 492         case STD_SET_ADDRESS:
 493                 AT91F_USB_SendZlp(pUdp);
 494                 pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);
 495                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;
 496                 break;
 497         case STD_SET_CONFIGURATION:
 498                 btConfiguration = wValue;
 499                 AT91F_USB_SendZlp(pUdp);
 500                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
 501                 pUdp->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
 502                 pUdp->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;
 503                 pUdp->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN)   : 0;
 504                 break;
 505         case STD_GET_CONFIGURATION:
 506                 AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));
 507                 break;
 508         case STD_GET_STATUS_ZERO:
 509                 wStatus = 0;
 510                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 511                 break;
 512         case STD_GET_STATUS_INTERFACE:
 513                 wStatus = 0;
 514                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 515                 break;
 516         case STD_GET_STATUS_ENDPOINT:
 517                 wStatus = 0;
 518                 wIndex &= 0x0F;
 519                 if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
 520                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 521                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 522                 }
 523                 else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
 524                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
 525                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));
 526                 }
 527                 else
 528                         AT91F_USB_SendStall(pUdp);
 529                 break;
 530         case STD_SET_FEATURE_ZERO:
 531                 AT91F_USB_SendStall(pUdp);
 532             break;
 533         case STD_SET_FEATURE_INTERFACE:
 534                 AT91F_USB_SendZlp(pUdp);
 535                 break;
 536         case STD_SET_FEATURE_ENDPOINT:
 537                 wIndex &= 0x0F;
 538                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 539                         pUdp->UDP_CSR[wIndex] = 0;
 540                         AT91F_USB_SendZlp(pUdp);
 541                 }
 542                 else
 543                         AT91F_USB_SendStall(pUdp);
 544                 break;
 545         case STD_CLEAR_FEATURE_ZERO:
 546                 AT91F_USB_SendStall(pUdp);
 547             break;
 548         case STD_CLEAR_FEATURE_INTERFACE:
 549                 AT91F_USB_SendZlp(pUdp);
 550                 break;
 551         case STD_CLEAR_FEATURE_ENDPOINT:
 552                 wIndex &= 0x0F;
 553                 if ((wValue == 0) && wIndex && (wIndex <= 3)) {
 554                         if (wIndex == 1)
 555                                 pUdp->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
 556                         else if (wIndex == 2)
 557                                 pUdp->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
 558                         else if (wIndex == 3)
 559                                 pUdp->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
 560                         AT91F_USB_SendZlp(pUdp);
 561                 }
 562                 else
 563                         AT91F_USB_SendStall(pUdp);
 564                 break;
 565
 566         // handle CDC class requests
 567         case SET_LINE_CODING:
 568                 while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
 569                 pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
 570                 AT91F_USB_SendZlp(pUdp);
 571                 break;
 572         case GET_LINE_CODING:
 573                 AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));
 574                 break;
 575         case SET_CONTROL_LINE_STATE:
 576                 btConnection = wValue;
 577                 AT91F_USB_SendZlp(pUdp);
 578                 break;
 579         default:
 580                 AT91F_USB_SendStall(pUdp);
 581             break;
 582         }
 583 }