1 /* USB Keyboard and CDC Serial Device for Teensy USB Development Board
2 * Copyright (c) 2009 PJRC.COM, LLC
3 * Modifications by Jacob Alexander (2011-2014)
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "usb_keyboard_serial.h"
30 // ----- Variables -----
32 // zero when we are not configured, non-zero when enumerated
33 static volatile uint8_t usb_configuration = 0;
35 // the time remaining before we transmit any partially full
36 // packet, or send a zero length packet.
37 static volatile uint8_t transmit_flush_timer = 0;
38 static uint8_t transmit_previous_timeout = 0;
40 // serial port settings (baud rate, control signals, etc) set
41 // by the PC. These are ignored, but kept in RAM.
42 static uint8_t cdc_line_coding[7] = {0x00, 0xE1, 0x00, 0x00, 0x00, 0x00, 0x08};
43 static uint8_t cdc_line_rtsdtr = 0;
47 // ----- USB Keyboard Functions -----
49 // Sends normal keyboard out to host
50 // NOTE: Make sure to match the descriptor
51 void usb_keyboard_toHost()
56 UEDATX = USBKeys_Modifiers;
61 // Normal Keys, only supports 6 in Boot mode
62 for ( i = 0; i < 6; i++)
64 UEDATX = USBKeys_Keys[i];
69 // send the contents of USBKeys_Keys and USBKeys_Modifiers
70 inline void usb_keyboard_send()
72 uint8_t intr_state, timeout;
75 timeout = UDFNUML + 50;
77 // Ready to transmit keypresses?
82 // has the USB gone offline? or exceeded timeout?
83 if ( !usb_configuration || UDFNUML == timeout )
85 erro_print("USB Offline? Timeout?");
89 // get ready to try checking again
93 // If not using Boot protocol, send NKRO
94 UENUM = USBKeys_Protocol ? KEYBOARD_NKRO_ENDPOINT : KEYBOARD_ENDPOINT;
95 } while ( !( UEINTX & (1 << RWAL) ) );
97 switch ( USBKeys_Protocol )
99 // Send boot keyboard interrupt packet(s)
101 usb_keyboard_toHost();
102 USBKeys_Changed = USBKeyChangeState_None;
105 // Send NKRO keyboard interrupts packet(s)
107 // Check system control keys
108 if ( USBKeys_Changed & USBKeyChangeState_System )
111 UEDATX = USBKeys_SysCtrl;
112 UEINTX = 0; // Finished with ID
114 USBKeys_Changed &= ~USBKeyChangeState_System; // Mark sent
117 // Check consumer control keys
118 if ( USBKeys_Changed & USBKeyChangeState_Consumer )
121 UEDATX = (uint8_t)(USBKeys_ConsCtrl & 0x00FF);
122 UEDATX = (uint8_t)(USBKeys_ConsCtrl >> 8);
123 UEINTX = 0; // Finished with ID
125 USBKeys_Changed &= ~USBKeyChangeState_Consumer; // Mark sent
128 // Standard HID Keyboard
129 if ( USBKeys_Changed )
134 UEDATX = USBKeys_Modifiers;
136 // 4-49 (first 6 bytes)
137 for ( uint8_t byte = 0; byte < 6; byte++ )
138 UEDATX = USBKeys_Keys[ byte ];
140 // 51-155 (Middle 14 bytes)
141 for ( uint8_t byte = 6; byte < 20; byte++ )
142 UEDATX = USBKeys_Keys[ byte ];
144 // 157-164 (Next byte)
145 for ( uint8_t byte = 20; byte < 21; byte++ )
146 UEDATX = USBKeys_Keys[ byte ];
148 // 176-221 (last 6 bytes)
149 for ( uint8_t byte = 21; byte < 27; byte++ )
150 UEDATX = USBKeys_Keys[ byte ];
152 UEINTX = 0; // Finished with ID
154 USBKeys_Changed = USBKeyChangeState_None; // Mark sent
160 USBKeys_Idle_Count = 0;
166 // ----- USB Virtual Serial Port (CDC) Functions -----
168 // get the next character, or -1 if nothing received
169 int16_t usb_serial_getchar()
171 uint8_t c, intr_state;
173 // interrupts are disabled so these functions can be
174 // used from the main program or interrupt context,
175 // even both in the same program!
178 if (!usb_configuration) {
182 UENUM = CDC_RX_ENDPOINT;
185 if (!(c & (1<<RWAL))) {
187 if (c & (1<<RXOUTI)) {
194 // take one byte out of the buffer
196 // if buffer completely used, release it
197 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x6B;
202 // number of bytes available in the receive buffer
203 uint8_t usb_serial_available()
205 uint8_t n=0, i, intr_state;
209 if (usb_configuration) {
210 UENUM = CDC_RX_ENDPOINT;
214 if (i & (1<<RXOUTI) && !(i & (1<<RWAL))) UEINTX = 0x6B;
221 // discard any buffered input
222 void usb_serial_flush_input()
226 if (usb_configuration) {
229 UENUM = CDC_RX_ENDPOINT;
230 while ((UEINTX & (1<<RWAL))) {
237 // transmit a character. 0 returned on success, -1 on error
238 int8_t usb_serial_putchar( uint8_t c )
240 uint8_t timeout, intr_state;
242 // if we're not online (enumerated and configured), error
243 if (!usb_configuration) return -1;
244 // interrupts are disabled so these functions can be
245 // used from the main program or interrupt context,
246 // even both in the same program!
249 UENUM = CDC_TX_ENDPOINT;
250 // if we gave up due to timeout before, don't wait again
251 if (transmit_previous_timeout) {
252 if (!(UEINTX & (1<<RWAL))) {
256 transmit_previous_timeout = 0;
258 // wait for the FIFO to be ready to accept data
259 timeout = UDFNUML + TRANSMIT_TIMEOUT;
261 // are we ready to transmit?
262 if (UEINTX & (1<<RWAL)) break;
264 // have we waited too long? This happens if the user
265 // is not running an application that is listening
266 if (UDFNUML == timeout) {
267 transmit_previous_timeout = 1;
270 // has the USB gone offline?
271 if (!usb_configuration) return -1;
272 // get ready to try checking again
275 UENUM = CDC_TX_ENDPOINT;
277 // actually write the byte into the FIFO
279 // if this completed a packet, transmit it now!
280 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
281 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
287 // transmit a character, but do not wait if the buffer is full,
288 // 0 returned on success, -1 on buffer full or error
289 int8_t usb_serial_putchar_nowait( uint8_t c )
293 if (!usb_configuration) return -1;
296 UENUM = CDC_TX_ENDPOINT;
297 if (!(UEINTX & (1<<RWAL))) {
302 // actually write the byte into the FIFO
304 // if this completed a packet, transmit it now!
305 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
306 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
311 // transmit a buffer.
312 // 0 returned on success, -1 on error
313 // This function is optimized for speed! Each call takes approx 6.1 us overhead
314 // plus 0.25 us per byte. 12 Mbit/sec USB has 8.67 us per-packet overhead and
315 // takes 0.67 us per byte. If called with 64 byte packet-size blocks, this function
316 // can transmit at full USB speed using 43% CPU time. The maximum theoretical speed
317 // is 19 packets per USB frame, or 1216 kbytes/sec. However, bulk endpoints have the
318 // lowest priority, so any other USB devices will likely reduce the speed. Speed
319 // can also be limited by how quickly the PC-based software reads data, as the host
320 // controller in the PC will not allocate bandwitdh without a pending read request.
321 // (thanks to Victor Suarez for testing and feedback and initial code)
323 int8_t usb_serial_write( const char *buffer, uint16_t size )
325 uint8_t timeout, intr_state, write_size;
327 // if we're not online (enumerated and configured), error
328 if (!usb_configuration) return -1;
329 // interrupts are disabled so these functions can be
330 // used from the main program or interrupt context,
331 // even both in the same program!
334 UENUM = CDC_TX_ENDPOINT;
335 // if we gave up due to timeout before, don't wait again
337 if (transmit_previous_timeout) {
338 if (!(UEINTX & (1<<RWAL))) {
342 transmit_previous_timeout = 0;
345 // each iteration of this loop transmits a packet
347 // wait for the FIFO to be ready to accept data
348 timeout = UDFNUML + TRANSMIT_TIMEOUT;
350 // are we ready to transmit?
351 if (UEINTX & (1<<RWAL)) break;
353 // have we waited too long? This happens if the user
354 // is not running an application that is listening
355 if (UDFNUML == timeout) {
356 transmit_previous_timeout = 1;
359 // has the USB gone offline?
360 if (!usb_configuration) return -4;
361 // get ready to try checking again
364 UENUM = CDC_TX_ENDPOINT;
367 // compute how many bytes will fit into the next packet
368 write_size = CDC_TX_SIZE - UEBCLX;
369 if (write_size > size) write_size = size;
373 switch (write_size) {
374 #if (CDC_TX_SIZE == 64)
375 case 64: UEDATX = *buffer++;
376 case 63: UEDATX = *buffer++;
377 case 62: UEDATX = *buffer++;
378 case 61: UEDATX = *buffer++;
379 case 60: UEDATX = *buffer++;
380 case 59: UEDATX = *buffer++;
381 case 58: UEDATX = *buffer++;
382 case 57: UEDATX = *buffer++;
383 case 56: UEDATX = *buffer++;
384 case 55: UEDATX = *buffer++;
385 case 54: UEDATX = *buffer++;
386 case 53: UEDATX = *buffer++;
387 case 52: UEDATX = *buffer++;
388 case 51: UEDATX = *buffer++;
389 case 50: UEDATX = *buffer++;
390 case 49: UEDATX = *buffer++;
391 case 48: UEDATX = *buffer++;
392 case 47: UEDATX = *buffer++;
393 case 46: UEDATX = *buffer++;
394 case 45: UEDATX = *buffer++;
395 case 44: UEDATX = *buffer++;
396 case 43: UEDATX = *buffer++;
397 case 42: UEDATX = *buffer++;
398 case 41: UEDATX = *buffer++;
399 case 40: UEDATX = *buffer++;
400 case 39: UEDATX = *buffer++;
401 case 38: UEDATX = *buffer++;
402 case 37: UEDATX = *buffer++;
403 case 36: UEDATX = *buffer++;
404 case 35: UEDATX = *buffer++;
405 case 34: UEDATX = *buffer++;
406 case 33: UEDATX = *buffer++;
408 #if (CDC_TX_SIZE >= 32)
409 case 32: UEDATX = *buffer++;
410 case 31: UEDATX = *buffer++;
411 case 30: UEDATX = *buffer++;
412 case 29: UEDATX = *buffer++;
413 case 28: UEDATX = *buffer++;
414 case 27: UEDATX = *buffer++;
415 case 26: UEDATX = *buffer++;
416 case 25: UEDATX = *buffer++;
417 case 24: UEDATX = *buffer++;
418 case 23: UEDATX = *buffer++;
419 case 22: UEDATX = *buffer++;
420 case 21: UEDATX = *buffer++;
421 case 20: UEDATX = *buffer++;
422 case 19: UEDATX = *buffer++;
423 case 18: UEDATX = *buffer++;
424 case 17: UEDATX = *buffer++;
426 #if (CDC_TX_SIZE >= 16)
427 case 16: UEDATX = *buffer++;
428 case 15: UEDATX = *buffer++;
429 case 14: UEDATX = *buffer++;
430 case 13: UEDATX = *buffer++;
431 case 12: UEDATX = *buffer++;
432 case 11: UEDATX = *buffer++;
433 case 10: UEDATX = *buffer++;
434 case 9: UEDATX = *buffer++;
436 case 8: UEDATX = *buffer++;
437 case 7: UEDATX = *buffer++;
438 case 6: UEDATX = *buffer++;
439 case 5: UEDATX = *buffer++;
440 case 4: UEDATX = *buffer++;
441 case 3: UEDATX = *buffer++;
442 case 2: UEDATX = *buffer++;
444 case 1: UEDATX = *buffer++;
447 // if this completed a packet, transmit it now!
448 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
449 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
455 // immediately transmit any buffered output.
456 // This doesn't actually transmit the data - that is impossible!
457 // USB devices only transmit when the host allows, so the best
458 // we can do is release the FIFO buffer for when the host wants it
459 void usb_serial_flush_output()
465 if (transmit_flush_timer) {
466 UENUM = CDC_TX_ENDPOINT;
468 transmit_flush_timer = 0;
473 // functions to read the various async serial settings. These
474 // aren't actually used by USB at all (communication is always
475 // at full USB speed), but they are set by the host so we can
476 // set them properly if we're converting the USB to a real serial
478 uint32_t usb_serial_get_baud()
480 uint32_t *baud = (uint32_t*)cdc_line_coding;
483 uint8_t usb_serial_get_stopbits()
485 return cdc_line_coding[4];
487 uint8_t usb_serial_get_paritytype()
489 return cdc_line_coding[5];
491 uint8_t usb_serial_get_numbits()
493 return cdc_line_coding[6];
495 uint8_t usb_serial_get_control()
497 return cdc_line_rtsdtr;
500 // write the control signals, DCD, DSR, RI, etc
501 // There is no CTS signal. If software on the host has transmitted
502 // data to you but you haven't been calling the getchar function,
503 // it remains buffered (either here or on the host) and can not be
504 // lost because you weren't listening at the right time, like it
505 // would in real serial communication.
506 int8_t usb_serial_set_control( uint8_t signals )
512 if (!usb_configuration) {
513 // we're not enumerated/configured
518 UENUM = CDC_ACM_ENDPOINT;
519 if (!(UEINTX & (1<<RWAL))) {
521 // TODO; should this try to abort the previously
522 // buffered message??
530 UEDATX = 0; // 0 seems to work nicely. what if this is 1??
542 // ----- General USB Functions -----
544 // Set the avr into firmware reload mode
545 void usb_device_reload()
548 // Disable watchdog, if enabled
549 // Disable all peripherals
552 USBCON = (1 << FRZCLK); // Disable USB
556 #if defined(__AVR_AT90USB162__) // Teensy 1.0
557 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
558 TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
559 DDRB = 0; DDRC = 0; DDRD = 0;
560 PORTB = 0; PORTC = 0; PORTD = 0;
561 asm volatile("jmp 0x3E00");
562 #elif defined(__AVR_ATmega32U4__) // Teensy 2.0
563 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
564 TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
565 DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
566 PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
567 asm volatile("jmp 0x7E00");
568 #elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
569 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
570 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
571 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
572 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
573 asm volatile("jmp 0xFC00");
574 #elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
575 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
576 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
577 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
578 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
579 asm volatile("jmp 0x1FC00");
584 // WDT Setup for software reset the chip
596 USB_FREEZE(); // enable USB
597 PLL_CONFIG(); // config PLL
598 while (!(PLLCSR & (1<<PLOCK))) ; // wait for PLL lock
599 USB_CONFIG(); // start USB clock
600 UDCON = 0; // enable attach resistor
601 usb_configuration = 0;
602 UDIEN = (1<<EORSTE) | (1<<SOFE);
605 // Disable watchdog timer after possible software reset
606 //wdt_init(); // XXX Not working...seems to be ok without this, not sure though
609 // return 0 if the USB is not configured, or the configuration
610 // number selected by the HOST
611 uint8_t usb_configured()
613 return usb_configuration;
616 // USB Device Interrupt - handle all device-level events
617 // the transmit buffer flushing is triggered by the start of frame
621 uint8_t intbits, t_cdc;
625 if ( intbits & (1 << EORSTI) )
629 UECFG0X = EP_TYPE_CONTROL;
630 UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
631 UEIENX = (1 << RXSTPE);
632 usb_configuration = 0;
635 if ( (intbits & (1 << SOFI)) && usb_configuration )
637 t_cdc = transmit_flush_timer;
640 transmit_flush_timer = --t_cdc;
643 UENUM = CDC_TX_ENDPOINT;
647 static uint8_t div4 = 0;
648 if ( USBKeys_Idle_Config && (++div4 & 3) == 0 )
650 USBKeys_Idle_Count++;
651 if ( USBKeys_Idle_Count == USBKeys_Idle_Config )
653 // XXX TODO Is this even used? If so, when? -Jacob
654 // From hasu's code, this section looks like it could fix the Mac SET_IDLE problem
655 // Send normal keyboard interrupt packet(s)
656 switch ( USBKeys_Protocol )
658 // Send boot keyboard interrupt packet(s)
659 case 0: usb_keyboard_toHost(); break;
660 // Send NKRO keyboard interrupts packet(s)
661 //case 1: usb_nkrokeyboard_toHost(); break; // XXX Not valid anymore
671 // Misc functions to wait for ready and send/receive packets
672 static inline void usb_wait_in_ready()
674 while (!(UEINTX & (1<<TXINI))) ;
676 static inline void usb_send_in()
678 UEINTX = ~(1<<TXINI);
680 static inline void usb_wait_receive_out()
682 while (!(UEINTX & (1<<RXOUTI))) ;
684 static inline void usb_ack_out()
686 UEINTX = ~(1<<RXOUTI);
691 // USB Endpoint Interrupt - endpoint 0 is handled here. The
692 // other endpoints are manipulated by the user-callable
693 // functions, and the start-of-frame interrupt.
700 uint8_t i, n, len, en;
702 uint8_t bmRequestType;
708 const uint8_t *desc_addr;
713 if (intbits & (1<<RXSTPI))
715 bmRequestType = UEDATX;
718 wValue |= (UEDATX << 8);
720 wIndex |= (UEDATX << 8);
722 wLength |= (UEDATX << 8);
723 UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
725 if ( bRequest == GET_DESCRIPTOR )
727 list = (const uint8_t *)descriptor_list;
730 if ( i >= NUM_DESC_LIST )
732 UECONX = (1 << STALLRQ) | (1 << EPEN); //stall
735 desc_val = pgm_read_word(list);
736 if ( desc_val != wValue )
738 list += sizeof( struct descriptor_list_struct );
742 desc_val = pgm_read_word(list);
743 if ( desc_val != wIndex )
745 list += sizeof(struct descriptor_list_struct) - 2;
749 desc_addr = (const uint8_t *)pgm_read_word(list);
751 desc_length = pgm_read_byte(list);
754 len = (wLength < 256) ? wLength : 255;
755 if (len > desc_length) len = desc_length;
757 // wait for host ready for IN packet
760 } while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
761 if (i & (1<<RXOUTI)) return; // abort
763 n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
764 for (i = n; i; i--) {
765 UEDATX = pgm_read_byte(desc_addr++);
769 } while (len || n == ENDPOINT0_SIZE);
773 if (bRequest == SET_ADDRESS) {
776 UDADDR = wValue | (1<<ADDEN);
780 if ( bRequest == SET_CONFIGURATION && bmRequestType == 0 )
782 usb_configuration = wValue;
784 transmit_flush_timer = 0;
786 cfg = endpoint_config_table;
787 // Setup each of the 6 additional endpoints (0th already configured)
788 for ( i = 1; i < 6; i++ )
791 en = pgm_read_byte(cfg++);
795 UECFG0X = pgm_read_byte(cfg++);
796 UECFG1X = pgm_read_byte(cfg++);
804 if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
806 UEDATX = usb_configuration;
811 if ( ( wIndex == KEYBOARD_INTERFACE && USBKeys_Protocol == 0 )
812 || ( wIndex == KEYBOARD_NKRO_INTERFACE && USBKeys_Protocol == 1 ) )
814 if ( bmRequestType == 0xA1)
816 if ( bRequest == HID_GET_REPORT )
820 // Send normal keyboard interrupt packet(s)
821 switch ( USBKeys_Protocol )
823 // Send boot keyboard interrupt packet(s)
824 case 0: usb_keyboard_toHost(); break;
825 // Send NKRO keyboard interrupts packet(s)
826 //case 1: usb_nkrokeyboard_toHost(); break; // XXX Not valid anymore
832 if ( bRequest == HID_GET_IDLE )
835 UEDATX = USBKeys_Idle_Config;
839 if ( bRequest == HID_GET_PROTOCOL )
842 UEDATX = USBKeys_Protocol;
847 if ( bmRequestType == 0x21 )
849 if ( bRequest == HID_SET_REPORT )
851 usb_wait_receive_out();
852 USBKeys_LEDs = UEDATX;
857 if ( bRequest == HID_SET_IDLE )
860 USBKeys_Idle_Config = (wValue >> 8);
861 USBKeys_Idle_Count = 0;
866 if ( bRequest == HID_SET_PROTOCOL )
869 USBKeys_Protocol = wValue; // 0 - Boot Mode, 1 - NKRO Mode
877 if (bRequest == CDC_GET_LINE_CODING && bmRequestType == 0xA1) {
880 for (i=0; i<7; i++) {
887 if (bRequest == CDC_SET_LINE_CODING && bmRequestType == 0x21) {
888 usb_wait_receive_out();
890 for (i=0; i<7; i++) {
898 if (bRequest == CDC_SET_CONTROL_LINE_STATE && bmRequestType == 0x21) {
899 cdc_line_rtsdtr = wValue;
905 if (bRequest == GET_STATUS) {
908 if (bmRequestType == 0x82) {
910 if (UECONX & (1<<STALLRQ)) i = 1;
919 if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
920 && bmRequestType == 0x02 && wValue == 0) {
922 if (i >= 1 && i <= MAX_ENDPOINT) {
925 if (bRequest == SET_FEATURE) {
926 UECONX = (1<<STALLRQ)|(1<<EPEN);
928 UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
936 UECONX = (1 << STALLRQ) | (1 << EPEN); // stall