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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 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 }
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