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1 /*

2 * at91sam7s USB CDC device implementation

3 *

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 */

35 #include "usb_cdc.h"

36 #include "at91sam7s512.h"

37 #include "config_gpio.h"

40 #define AT91C_EP_CONTROL 0

41 #define AT91C_EP_OUT 1

42 #define AT91C_EP_IN 2

43 #define AT91C_EP_NOTIFY 3

44 #define AT91C_EP_OUT_SIZE 0x40

45 #define AT91C_EP_IN_SIZE 0x40

47 // Language must always be 0.

48 #define STR_LANGUAGE_CODES 0x00

49 #define STR_MANUFACTURER 0x01

50 #define STR_PRODUCT 0x02

52 static const char devDescriptor[] = {

53 /* Device descriptor */

54 0x12, // bLength

55 0x01, // bDescriptorType

         0x00,0x02, // Complies with USB Spec. Release (0200h = release 2.0)

57 0x02, // bDeviceClass: (Communication Device Class)

58 0x00, // bDeviceSubclass: (unused at this time)

59 0x00, // bDeviceProtocol: (unused at this time)

60 0x08, // bMaxPacketSize0

         0xc4,0x9a, // Vendor ID (0x9ac4 = J. Westhues)

         0x8f,0x4b, // Product ID (0x4b8f = Proxmark-3 RFID Instrument)

         0x01,0x00, // Device release number (0001)

64 STR_MANUFACTURER, // iManufacturer

65 STR_PRODUCT, // iProduct

66 0x00, // iSerialNumber

67 0x01 // bNumConfigs

68 };

70 static const char cfgDescriptor[] = {

71 /* ============== CONFIGURATION 1 =========== */

72 /* Configuration 1 descriptor */

73 0x09, // CbLength

74 0x02, // CbDescriptorType

75 0x43, // CwTotalLength 2 EP + Control

76 0x00,

77 0x02, // CbNumInterfaces

78 0x01, // CbConfigurationValue

79 0x00, // CiConfiguration

80 0xC0, // CbmAttributes 0xA0

81 0xFA, // CMaxPower

83 /* Interface 0 Descriptor: Communication Class Interface */

84 0x09, // bLength

85 0x04, // bDescriptorType

86 0x00, // bInterfaceNumber

87 0x00, // bAlternateSetting

88 0x01, // bNumEndpoints

89 0x02, // bInterfaceClass: Communication Interface Class

90 0x02, // bInterfaceSubclass: Abstract Control Model

91 0x01, // bInterfaceProtocol: Common AT Commands, V.25ter

92 0x00, // iInterface

94 /* Header Functional Descriptor */

95 0x05, // bFunction Length

96 0x24, // bDescriptor type: CS_INTERFACE

97 0x00, // bDescriptor subtype: Header Functional Descriptor

98 0x10, // bcdCDC:1.1

99 0x01,

100

101 /* ACM Functional Descriptor */

102 0x04, // bFunctionLength

103 0x24, // bDescriptor Type: CS_INTERFACE

104 0x02, // bDescriptor Subtype: Abstract Control Management Functional Descriptor

105 0x02, // bmCapabilities: D1: Device supports the request combination of Set_Line_Coding, Set_Control_Line_State, Get_Line_Coding, and the notification Serial_State

106

107 /* Union Functional Descriptor */

108 0x05, // bFunctionLength

109 0x24, // bDescriptorType: CS_INTERFACE

110 0x06, // bDescriptor Subtype: Union Functional Descriptor

111 0x00, // bMasterInterface: Communication Class Interface

112 0x01, // bSlaveInterface0: Data Class Interface

113

114 /* Call Management Functional Descriptor */

115 0x05, // bFunctionLength

116 0x24, // bDescriptor Type: CS_INTERFACE

117 0x01, // bDescriptor Subtype: Call Management Functional Descriptor

118 0x00, // bmCapabilities: Device sends/receives call management information only over the Communication Class interface. Device does not handle call management itself

119 0x01, // bDataInterface: Data Class Interface 1

120

121 /* Endpoint 1 descriptor */

122 0x07, // bLength

123 0x05, // bDescriptorType

124 0x83, // bEndpointAddress: Endpoint 03 - IN

125 0x03, // bmAttributes: INT

126 0x08, // wMaxPacketSize: 8

127 0x00,

128 0xFF, // bInterval

129

130 /* Interface 1 Descriptor: Data Class Interface */

131 0x09, // bLength

132 0x04, // bDescriptorType

133 0x01, // bInterfaceNumber

134 0x00, // bAlternateSetting

135 0x02, // bNumEndpoints

136 0x0A, // bInterfaceClass: Data Interface Class

137 0x00, // bInterfaceSubclass: not used

138 0x00, // bInterfaceProtocol: No class specific protocol required)

139 0x00, // iInterface

140

141 /* Endpoint 1 descriptor */

142 0x07, // bLength

143 0x05, // bDescriptorType

144 0x01, // bEndpointAddress: Endpoint 01 - OUT

145 0x02, // bmAttributes: BULK

146 AT91C_EP_OUT_SIZE, // wMaxPacketSize

147 0x00,

148 0x00, // bInterval

149

150 /* Endpoint 2 descriptor */

151 0x07, // bLength

152 0x05, // bDescriptorType

153 0x82, // bEndpointAddress: Endpoint 02 - IN

154 0x02, // bmAttributes: BULK

155 AT91C_EP_IN_SIZE, // wMaxPacketSize

156 0x00,

157 0x00 // bInterval

158 };

159

160 static const char StrDescLanguageCodes[] = {

161 4, // Length

162 0x03, // Type is string

163 0x09, 0x04 // supported language Code 0 = 0x0409 (English)

164 };

165

166 // Note: ModemManager (Linux) ignores Proxmark3 devices by matching the

167 // manufacturer string "proxmark.org". Don't change this.

168 static const char StrDescManufacturer[] = {

169 26, // Length

170 0x03, // Type is string

171 'p', 0x00,

172 'r', 0x00,

173 'o', 0x00,

174 'x', 0x00,

175 'm', 0x00,

176 'a', 0x00,

177 'r', 0x00,

178 'k', 0x00,

179 '.', 0x00,

180 'o', 0x00,

181 'r', 0x00,

182 'g', 0x00

183 };

184

185 static const char StrDescProduct[] = {

186 8, // Length

187 0x03, // Type is string

188 'P', 0x00,

189 'M', 0x00,

190 '3', 0x00

191 };

192

 const char* getStringDescriptor(uint8_t idx)

194 {

195 switch (idx) {

196 case STR_LANGUAGE_CODES:

197 return StrDescLanguageCodes;

198 case STR_MANUFACTURER:

199 return StrDescManufacturer;

200 case STR_PRODUCT:

201 return StrDescProduct;

202 default:

203 return NULL;

204 }

205 }

206

207 // Bitmap for all status bits in CSR which must be written as 1 to cause no effect

208 #define REG_NO_EFFECT_1_ALL AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 \

209 |AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP \

210 |AT91C_UDP_TXCOMP

211

212 // Clear flags in the UDP_CSR register

213 #define UDP_CLEAR_EP_FLAGS(endpoint, flags) { \

214 volatile unsigned int reg; \

215 reg = pUdp->UDP_CSR[(endpoint)]; \

216 reg |= REG_NO_EFFECT_1_ALL; \

217 reg &= ~(flags); \

218 pUdp->UDP_CSR[(endpoint)] = reg; \

219 }

220

221 // Set flags in the UDP_CSR register

222 #define UDP_SET_EP_FLAGS(endpoint, flags) { \

223 volatile unsigned int reg; \

224 reg = pUdp->UDP_CSR[(endpoint)]; \

225 reg |= REG_NO_EFFECT_1_ALL; \

226 reg |= (flags); \

227 pUdp->UDP_CSR[(endpoint)] = reg; \

228 }

229

230 /* USB standard request codes */

231 #define STD_GET_STATUS_ZERO 0x0080

232 #define STD_GET_STATUS_INTERFACE 0x0081

233 #define STD_GET_STATUS_ENDPOINT 0x0082

234

235 #define STD_CLEAR_FEATURE_ZERO 0x0100

236 #define STD_CLEAR_FEATURE_INTERFACE 0x0101

237 #define STD_CLEAR_FEATURE_ENDPOINT 0x0102

238

239 #define STD_SET_FEATURE_ZERO 0x0300

240 #define STD_SET_FEATURE_INTERFACE 0x0301

241 #define STD_SET_FEATURE_ENDPOINT 0x0302

242

243 #define STD_SET_ADDRESS 0x0500

244 #define STD_GET_DESCRIPTOR 0x0680

245 #define STD_SET_DESCRIPTOR 0x0700

246 #define STD_GET_CONFIGURATION 0x0880

247 #define STD_SET_CONFIGURATION 0x0900

248 #define STD_GET_INTERFACE 0x0A81

249 #define STD_SET_INTERFACE 0x0B01

250 #define STD_SYNCH_FRAME 0x0C82

251

252 /* CDC Class Specific Request Code */

253 #define GET_LINE_CODING 0x21A1

254 #define SET_LINE_CODING 0x2021

255 #define SET_CONTROL_LINE_STATE 0x2221

256

257 typedef struct {

258 unsigned int dwDTERRate;

259 char bCharFormat;

260 char bParityType;

261 char bDataBits;

262 } AT91S_CDC_LINE_CODING, *AT91PS_CDC_LINE_CODING;

263

264 AT91S_CDC_LINE_CODING line = {

265 115200, // baudrate

266 0, // 1 Stop Bit

267 0, // None Parity

268 8}; // 8 Data bits

269

270

271 void AT91F_CDC_Enumerate();

272

273 AT91PS_UDP pUdp = AT91C_BASE_UDP;

274 byte_t btConfiguration = 0;

275 byte_t btConnection = 0;

276 byte_t btReceiveBank = AT91C_UDP_RX_DATA_BK0;

277

278

279 //*----------------------------------------------------------------------------

280 //* \fn usb_disable

281 //* \brief This function deactivates the USB device

282 //*----------------------------------------------------------------------------

283 void usb_disable() {

284 // Disconnect the USB device

285 AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;

286

287 // Clear all lingering interrupts

         if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {

289 pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;

290 }

291 }

292

293

294 //*----------------------------------------------------------------------------

295 //* \fn usb_enable

296 //* \brief This function Activates the USB device

297 //*----------------------------------------------------------------------------

298 void usb_enable() {

299 // Set the PLL USB Divider

300 AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;

301

302 // Specific Chip USB Initialisation

303 // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock

304 AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;

         AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);

306

307 // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO

308 // Set in PIO mode and Configure in Output

309 AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode

310 AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output

311

312 // Clear for set the Pullup resistor

313 AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;

314

315 // Disconnect and reconnect USB controller for 100ms

316 usb_disable();

317

318 // Wait for a short while

         for (volatile size_t i=0; i<0x100000; i++);

320

321 // Reconnect USB reconnect

322 AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;

323 AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;

324 }

325

326

327 //*----------------------------------------------------------------------------

328 //* \fn usb_check

329 //* \brief Test if the device is configured and handle enumeration

330 //*----------------------------------------------------------------------------

331 bool usb_check() {

332 AT91_REG isr = pUdp->UDP_ISR;

333

334 if (isr & AT91C_UDP_ENDBUSRES) {

335 pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;

336 // reset all endpoints

                 pUdp->UDP_RSTEP  = (unsigned int)-1;

338 pUdp->UDP_RSTEP = 0;

339 // Enable the function

340 pUdp->UDP_FADDR = AT91C_UDP_FEN;

341 // Configure endpoint 0

                 pUdp->UDP_CSR[AT91C_EP_CONTROL] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);

         } else if (isr & AT91C_UDP_EPINT0) {

344 pUdp->UDP_ICR = AT91C_UDP_EPINT0;

345 AT91F_CDC_Enumerate();

346 }

         return (btConfiguration) ? true : false;

348 }

349

350

351 bool usb_poll()

352 {

         if (!usb_check()) return false;

         return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);

355 }

356

357

358 /**

359 In github PR #129, some users appears to get a false positive from

360 usb_poll, which returns true, but the usb_read operation

361 still returns 0.

362 This check is basically the same as above, but also checks

363 that the length available to read is non-zero, thus hopefully fixes the

364 bug.

365 **/

366 bool usb_poll_validate_length()

367 {

         if (!usb_check()) return false;

         if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;

         return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) >  0;

371 }

372

373 //*----------------------------------------------------------------------------

374 //* \fn usb_read

375 //* \brief Read available data from Endpoint OUT

376 //*----------------------------------------------------------------------------

 uint32_t usb_read(byte_t* data, size_t len) {

378 byte_t bank = btReceiveBank;

         uint32_t packetSize, nbBytesRcv = 0;

380 uint32_t time_out = 0;

381

382 while (len) {

                 if (!usb_check()) break;

384

                 if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {

                         packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);

387 len -= packetSize;

388 while(packetSize--)

                                 data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];

390 UDP_CLEAR_EP_FLAGS(AT91C_EP_OUT, bank);

391 if (bank == AT91C_UDP_RX_DATA_BK0) {

392 bank = AT91C_UDP_RX_DATA_BK1;

393 } else {

394 bank = AT91C_UDP_RX_DATA_BK0;

395 }

396 }

                 if (time_out++ == 0x1fff) break;

398 }

399

400 btReceiveBank = bank;

401 return nbBytesRcv;

402 }

403

404

405 //*----------------------------------------------------------------------------

406 //* \fn usb_write

407 //* \brief Send through endpoint 2

408 //*----------------------------------------------------------------------------

 uint32_t usb_write(const byte_t* data, const size_t len) {

410 size_t length = len;

411 uint32_t cpt = 0;

412

         if (!length) return 0;

         if (!usb_check()) return 0;

415

416 // Send the first packet

         cpt = MIN(length, AT91C_EP_IN_SIZE);

418 length -= cpt;

419 while (cpt--) {

420 pUdp->UDP_FDR[AT91C_EP_IN] = *data++;

421 }

422 UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);

423

424 while (length) {

425 // Fill the next bank

                 cpt = MIN(length, AT91C_EP_IN_SIZE);

427 length -= cpt;

428 while (cpt--) {

429 pUdp->UDP_FDR[AT91C_EP_IN] = *data++;

430 }

431 // Wait for the previous bank to be sent

                 while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {

                         if (!usb_check()) return length;

434 }

435 UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP);

                 while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);

437 UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);

438 }

439

440 // Wait for the end of transfer

         while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {

                 if (!usb_check()) return length;

443 }

444

445 UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP);

         while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);

447

448 return length;

449 }

450

451

452 //*----------------------------------------------------------------------------

453 //* \fn AT91F_USB_SendData

454 //* \brief Send Data through the control endpoint

455 //*----------------------------------------------------------------------------

 unsigned int csrTab[100] = {0x00};

457 unsigned char csrIdx = 0;

458

 static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {

460 uint32_t cpt = 0;

461 AT91_REG csr;

462

463 do {

                 cpt = MIN(length, 8);

465 length -= cpt;

466

467 while (cpt--)

                         pUdp->UDP_FDR[0] = *pData++;

469

                 if (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) {

471 UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);

                         while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);

473 }

474

475 UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXPKTRDY);

476 do {

477 csr = pUdp->UDP_CSR[AT91C_EP_CONTROL];

478

479 // Data IN stage has been stopped by a status OUT

480 if (csr & AT91C_UDP_RX_DATA_BK0) {

481 UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_RX_DATA_BK0);

482 return;

483 }

                 } while ( !(csr & AT91C_UDP_TXCOMP) );

485

486 } while (length);

487

         if (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) {

489 UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);

                 while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);

491 }

492 }

493

494

495 //*----------------------------------------------------------------------------

496 //* \fn AT91F_USB_SendZlp

497 //* \brief Send zero length packet through the control endpoint

498 //*----------------------------------------------------------------------------

499 void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {

500 UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXPKTRDY);

         while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) );

502 UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);

         while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);

504 }

505

506

507 //*----------------------------------------------------------------------------

508 //* \fn AT91F_USB_SendStall

509 //* \brief Stall the control endpoint

510 //*----------------------------------------------------------------------------

511 void AT91F_USB_SendStall(AT91PS_UDP pUdp) {

512 UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_FORCESTALL);

         while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_ISOERROR) );

         UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);

         while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));

516 }

517

518

519 //*----------------------------------------------------------------------------

520 //* \fn AT91F_CDC_Enumerate

521 //* \brief This function is a callback invoked when a SETUP packet is received

522 //*----------------------------------------------------------------------------

523 void AT91F_CDC_Enumerate() {

524 byte_t bmRequestType, bRequest;

         uint16_t wValue, wIndex, wLength, wStatus;

526

         if ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_RXSETUP) )

528 return;

529

530 bmRequestType = pUdp->UDP_FDR[AT91C_EP_CONTROL];

531 bRequest = pUdp->UDP_FDR[AT91C_EP_CONTROL];

         wValue        = (pUdp->UDP_FDR[AT91C_EP_CONTROL] & 0xFF);

         wValue       |= (pUdp->UDP_FDR[AT91C_EP_CONTROL] << 8);

         wIndex        = (pUdp->UDP_FDR[AT91C_EP_CONTROL] & 0xFF);

         wIndex       |= (pUdp->UDP_FDR[AT91C_EP_CONTROL] << 8);

         wLength       = (pUdp->UDP_FDR[AT91C_EP_CONTROL] & 0xFF);

         wLength      |= (pUdp->UDP_FDR[AT91C_EP_CONTROL] << 8);

538

         if (bmRequestType & 0x80) {     // Data Phase Transfer Direction Device to Host

540 UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_DIR);

                 while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_DIR) );

542 }

543 UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_RXSETUP);

         while ( (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_RXSETUP)  );

545

546 // Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1

         switch ((bRequest << 8) | bmRequestType) {

548 case STD_GET_DESCRIPTOR:

                 if (wValue == 0x100)       // Return Device Descriptor

                         AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));

                 else if (wValue == 0x200)  // Return Configuration Descriptor

                         AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));

                 else if ((wValue & 0xF00) == 0x300) { // Return String Descriptor

                         const char *strDescriptor = getStringDescriptor(wValue & 0xff);

555 if (strDescriptor != NULL) {

                                 AT91F_USB_SendData(pUdp, strDescriptor, MIN(strDescriptor[0], wLength));

557 } else {

558 AT91F_USB_SendStall(pUdp);

559 }

560 }

561 else

562 AT91F_USB_SendStall(pUdp);

563 break;

564 case STD_SET_ADDRESS:

565 AT91F_USB_SendZlp(pUdp);

566 pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);

                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;

568 break;

569 case STD_SET_CONFIGURATION:

570 btConfiguration = wValue;

571 AT91F_USB_SendZlp(pUdp);

                 pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;

                 pUdp->UDP_CSR[AT91C_EP_OUT]    = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;

                 pUdp->UDP_CSR[AT91C_EP_IN]     = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;

                 pUdp->UDP_CSR[AT91C_EP_NOTIFY] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN)   : 0;

576 break;

577 case STD_GET_CONFIGURATION:

                 AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));

579 break;

580 case STD_GET_STATUS_ZERO:

581 wStatus = 0; // Device is Bus powered, remote wakeup disabled

                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));

583 break;

584 case STD_GET_STATUS_INTERFACE:

585 wStatus = 0; // reserved for future use

                 AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));

587 break;

588 case STD_GET_STATUS_ENDPOINT:

589 wStatus = 0;

590 wIndex &= 0x0F;

                 if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= AT91C_EP_NOTIFY)) {

                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;

                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));

594 }

                 else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == AT91C_EP_CONTROL)) {

                         wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;

                         AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));

598 }

599 else

600 AT91F_USB_SendStall(pUdp);

601 break;

602 case STD_SET_FEATURE_ZERO:

603 AT91F_USB_SendStall(pUdp);

604 break;

605 case STD_SET_FEATURE_INTERFACE:

606 AT91F_USB_SendZlp(pUdp);

607 break;

608 case STD_SET_FEATURE_ENDPOINT:

609 wIndex &= 0x0F;

                 if ((wValue == 0) && (wIndex >= AT91C_EP_OUT) && (wIndex <= AT91C_EP_NOTIFY)) {

                         pUdp->UDP_CSR[wIndex] = 0;

612 AT91F_USB_SendZlp(pUdp);

613 }

614 else

615 AT91F_USB_SendStall(pUdp);

616 break;

617 case STD_CLEAR_FEATURE_ZERO:

618 AT91F_USB_SendStall(pUdp);

619 break;

620 case STD_CLEAR_FEATURE_INTERFACE:

621 AT91F_USB_SendZlp(pUdp);

622 break;

623 case STD_CLEAR_FEATURE_ENDPOINT:

624 wIndex &= 0x0F;

                 if ((wValue == 0) && (wIndex >= AT91C_EP_OUT) && (wIndex <= AT91C_EP_NOTIFY)) {

626 if (wIndex == AT91C_EP_OUT)

                                 pUdp->UDP_CSR[AT91C_EP_OUT] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);

628 else if (wIndex == AT91C_EP_IN)

                                 pUdp->UDP_CSR[AT91C_EP_IN] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);

630 else if (wIndex == AT91C_EP_NOTIFY)

                                 pUdp->UDP_CSR[AT91C_EP_NOTIFY] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN);

632 AT91F_USB_SendZlp(pUdp);

633 }

634 else

635 AT91F_USB_SendStall(pUdp);

636 break;

637

638 // handle CDC class requests

639 case SET_LINE_CODING:

                 while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_RX_DATA_BK0) );

641 UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_RX_DATA_BK0);

642 AT91F_USB_SendZlp(pUdp);

643 break;

644 case GET_LINE_CODING:

                 AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));

646 break;

647 case SET_CONTROL_LINE_STATE:

648 btConnection = wValue;

649 AT91F_USB_SendZlp(pUdp);

650 break;

651 default:

652 AT91F_USB_SendStall(pUdp);

653 break;

654 }

655 }