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)
108 if ( USBKeys_Changed & USBKeyChangeState_Modifiers )
111 UEDATX = USBKeys_Modifiers;
112 UEINTX = 0; // Finished with ID
114 USBKeys_Changed &= ~USBKeyChangeState_Modifiers; // Mark sent
116 // Check main key section
117 else if ( USBKeys_Changed & USBKeyChangeState_MainKeys )
121 // 4-164 (first 20 bytes)
122 for ( uint8_t byte = 0; byte < 20; byte++ )
123 UEDATX = USBKeys_Keys[ byte ];
125 UEINTX = 0; // Finished with ID
127 USBKeys_Changed &= ~USBKeyChangeState_MainKeys; // Mark sent
129 // Check secondary key section
130 else if ( USBKeys_Changed & USBKeyChangeState_SecondaryKeys )
134 // 176-221 (last 6 bytes)
135 for ( uint8_t byte = 20; byte < 26; byte++ )
136 UEDATX = USBKeys_Keys[ byte ];
138 UEINTX = 0; // Finished with ID
140 USBKeys_Changed &= ~USBKeyChangeState_SecondaryKeys; // Mark sent
142 // Check system control keys
143 else if ( USBKeys_Changed & USBKeyChangeState_System )
146 UEDATX = USBKeys_SysCtrl;
147 UEINTX = 0; // Finished with ID
149 USBKeys_Changed &= ~USBKeyChangeState_System; // Mark sent
151 // Check consumer control keys
152 else if ( USBKeys_Changed & USBKeyChangeState_Consumer )
155 UEDATX = (uint8_t)(USBKeys_ConsCtrl & 0x00FF);
156 UEDATX = (uint8_t)(USBKeys_ConsCtrl >> 8);
157 UEINTX = 0; // Finished with ID
159 USBKeys_Changed &= ~USBKeyChangeState_Consumer; // Mark sent
165 USBKeys_Idle_Count = 0;
171 // ----- USB Virtual Serial Port (CDC) Functions -----
173 // get the next character, or -1 if nothing received
174 int16_t usb_serial_getchar()
176 uint8_t c, intr_state;
178 // interrupts are disabled so these functions can be
179 // used from the main program or interrupt context,
180 // even both in the same program!
183 if (!usb_configuration) {
187 UENUM = CDC_RX_ENDPOINT;
190 if (!(c & (1<<RWAL))) {
192 if (c & (1<<RXOUTI)) {
199 // take one byte out of the buffer
201 // if buffer completely used, release it
202 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x6B;
207 // number of bytes available in the receive buffer
208 uint8_t usb_serial_available()
210 uint8_t n=0, i, intr_state;
214 if (usb_configuration) {
215 UENUM = CDC_RX_ENDPOINT;
219 if (i & (1<<RXOUTI) && !(i & (1<<RWAL))) UEINTX = 0x6B;
226 // discard any buffered input
227 void usb_serial_flush_input()
231 if (usb_configuration) {
234 UENUM = CDC_RX_ENDPOINT;
235 while ((UEINTX & (1<<RWAL))) {
242 // transmit a character. 0 returned on success, -1 on error
243 int8_t usb_serial_putchar(uint8_t c)
245 uint8_t timeout, intr_state;
247 // if we're not online (enumerated and configured), error
248 if (!usb_configuration) return -1;
249 // interrupts are disabled so these functions can be
250 // used from the main program or interrupt context,
251 // even both in the same program!
254 UENUM = CDC_TX_ENDPOINT;
255 // if we gave up due to timeout before, don't wait again
256 if (transmit_previous_timeout) {
257 if (!(UEINTX & (1<<RWAL))) {
261 transmit_previous_timeout = 0;
263 // wait for the FIFO to be ready to accept data
264 timeout = UDFNUML + TRANSMIT_TIMEOUT;
266 // are we ready to transmit?
267 if (UEINTX & (1<<RWAL)) break;
269 // have we waited too long? This happens if the user
270 // is not running an application that is listening
271 if (UDFNUML == timeout) {
272 transmit_previous_timeout = 1;
275 // has the USB gone offline?
276 if (!usb_configuration) return -1;
277 // get ready to try checking again
280 UENUM = CDC_TX_ENDPOINT;
282 // actually write the byte into the FIFO
284 // if this completed a packet, transmit it now!
285 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
286 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
292 // transmit a character, but do not wait if the buffer is full,
293 // 0 returned on success, -1 on buffer full or error
294 int8_t usb_serial_putchar_nowait(uint8_t c)
298 if (!usb_configuration) return -1;
301 UENUM = CDC_TX_ENDPOINT;
302 if (!(UEINTX & (1<<RWAL))) {
307 // actually write the byte into the FIFO
309 // if this completed a packet, transmit it now!
310 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
311 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
316 // transmit a buffer.
317 // 0 returned on success, -1 on error
318 // This function is optimized for speed! Each call takes approx 6.1 us overhead
319 // plus 0.25 us per byte. 12 Mbit/sec USB has 8.67 us per-packet overhead and
320 // takes 0.67 us per byte. If called with 64 byte packet-size blocks, this function
321 // can transmit at full USB speed using 43% CPU time. The maximum theoretical speed
322 // is 19 packets per USB frame, or 1216 kbytes/sec. However, bulk endpoints have the
323 // lowest priority, so any other USB devices will likely reduce the speed. Speed
324 // can also be limited by how quickly the PC-based software reads data, as the host
325 // controller in the PC will not allocate bandwitdh without a pending read request.
326 // (thanks to Victor Suarez for testing and feedback and initial code)
328 int8_t usb_serial_write(const char *buffer, uint16_t size)
330 uint8_t timeout, intr_state, write_size;
332 // if we're not online (enumerated and configured), error
333 if (!usb_configuration) return -1;
334 // interrupts are disabled so these functions can be
335 // used from the main program or interrupt context,
336 // even both in the same program!
339 UENUM = CDC_TX_ENDPOINT;
340 // if we gave up due to timeout before, don't wait again
342 if (transmit_previous_timeout) {
343 if (!(UEINTX & (1<<RWAL))) {
347 transmit_previous_timeout = 0;
350 // each iteration of this loop transmits a packet
352 // wait for the FIFO to be ready to accept data
353 timeout = UDFNUML + TRANSMIT_TIMEOUT;
355 // are we ready to transmit?
356 if (UEINTX & (1<<RWAL)) break;
358 // have we waited too long? This happens if the user
359 // is not running an application that is listening
360 if (UDFNUML == timeout) {
361 transmit_previous_timeout = 1;
364 // has the USB gone offline?
365 if (!usb_configuration) return -4;
366 // get ready to try checking again
369 UENUM = CDC_TX_ENDPOINT;
372 // compute how many bytes will fit into the next packet
373 write_size = CDC_TX_SIZE - UEBCLX;
374 if (write_size > size) write_size = size;
378 switch (write_size) {
379 #if (CDC_TX_SIZE == 64)
380 case 64: UEDATX = *buffer++;
381 case 63: UEDATX = *buffer++;
382 case 62: UEDATX = *buffer++;
383 case 61: UEDATX = *buffer++;
384 case 60: UEDATX = *buffer++;
385 case 59: UEDATX = *buffer++;
386 case 58: UEDATX = *buffer++;
387 case 57: UEDATX = *buffer++;
388 case 56: UEDATX = *buffer++;
389 case 55: UEDATX = *buffer++;
390 case 54: UEDATX = *buffer++;
391 case 53: UEDATX = *buffer++;
392 case 52: UEDATX = *buffer++;
393 case 51: UEDATX = *buffer++;
394 case 50: UEDATX = *buffer++;
395 case 49: UEDATX = *buffer++;
396 case 48: UEDATX = *buffer++;
397 case 47: UEDATX = *buffer++;
398 case 46: UEDATX = *buffer++;
399 case 45: UEDATX = *buffer++;
400 case 44: UEDATX = *buffer++;
401 case 43: UEDATX = *buffer++;
402 case 42: UEDATX = *buffer++;
403 case 41: UEDATX = *buffer++;
404 case 40: UEDATX = *buffer++;
405 case 39: UEDATX = *buffer++;
406 case 38: UEDATX = *buffer++;
407 case 37: UEDATX = *buffer++;
408 case 36: UEDATX = *buffer++;
409 case 35: UEDATX = *buffer++;
410 case 34: UEDATX = *buffer++;
411 case 33: UEDATX = *buffer++;
413 #if (CDC_TX_SIZE >= 32)
414 case 32: UEDATX = *buffer++;
415 case 31: UEDATX = *buffer++;
416 case 30: UEDATX = *buffer++;
417 case 29: UEDATX = *buffer++;
418 case 28: UEDATX = *buffer++;
419 case 27: UEDATX = *buffer++;
420 case 26: UEDATX = *buffer++;
421 case 25: UEDATX = *buffer++;
422 case 24: UEDATX = *buffer++;
423 case 23: UEDATX = *buffer++;
424 case 22: UEDATX = *buffer++;
425 case 21: UEDATX = *buffer++;
426 case 20: UEDATX = *buffer++;
427 case 19: UEDATX = *buffer++;
428 case 18: UEDATX = *buffer++;
429 case 17: UEDATX = *buffer++;
431 #if (CDC_TX_SIZE >= 16)
432 case 16: UEDATX = *buffer++;
433 case 15: UEDATX = *buffer++;
434 case 14: UEDATX = *buffer++;
435 case 13: UEDATX = *buffer++;
436 case 12: UEDATX = *buffer++;
437 case 11: UEDATX = *buffer++;
438 case 10: UEDATX = *buffer++;
439 case 9: UEDATX = *buffer++;
441 case 8: UEDATX = *buffer++;
442 case 7: UEDATX = *buffer++;
443 case 6: UEDATX = *buffer++;
444 case 5: UEDATX = *buffer++;
445 case 4: UEDATX = *buffer++;
446 case 3: UEDATX = *buffer++;
447 case 2: UEDATX = *buffer++;
449 case 1: UEDATX = *buffer++;
452 // if this completed a packet, transmit it now!
453 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
454 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
460 // immediately transmit any buffered output.
461 // This doesn't actually transmit the data - that is impossible!
462 // USB devices only transmit when the host allows, so the best
463 // we can do is release the FIFO buffer for when the host wants it
464 void usb_serial_flush_output(void)
470 if (transmit_flush_timer) {
471 UENUM = CDC_TX_ENDPOINT;
473 transmit_flush_timer = 0;
478 // functions to read the various async serial settings. These
479 // aren't actually used by USB at all (communication is always
480 // at full USB speed), but they are set by the host so we can
481 // set them properly if we're converting the USB to a real serial
483 uint32_t usb_serial_get_baud()
485 uint32_t *baud = (uint32_t*)cdc_line_coding;
488 uint8_t usb_serial_get_stopbits()
490 return cdc_line_coding[4];
492 uint8_t usb_serial_get_paritytype()
494 return cdc_line_coding[5];
496 uint8_t usb_serial_get_numbits()
498 return cdc_line_coding[6];
500 uint8_t usb_serial_get_control()
502 return cdc_line_rtsdtr;
505 // write the control signals, DCD, DSR, RI, etc
506 // There is no CTS signal. If software on the host has transmitted
507 // data to you but you haven't been calling the getchar function,
508 // it remains buffered (either here or on the host) and can not be
509 // lost because you weren't listening at the right time, like it
510 // would in real serial communication.
511 int8_t usb_serial_set_control(uint8_t signals)
517 if (!usb_configuration) {
518 // we're not enumerated/configured
523 UENUM = CDC_ACM_ENDPOINT;
524 if (!(UEINTX & (1<<RWAL))) {
526 // TODO; should this try to abort the previously
527 // buffered message??
535 UEDATX = 0; // 0 seems to work nicely. what if this is 1??
547 // ----- General USB Functions -----
549 // Set the avr into firmware reload mode
550 void usb_device_reload()
553 // Disable watchdog, if enabled
554 // Disable all peripherals
557 USBCON = (1 << FRZCLK); // Disable USB
561 #if defined(__AVR_AT90USB162__) // Teensy 1.0
562 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
563 TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
564 DDRB = 0; DDRC = 0; DDRD = 0;
565 PORTB = 0; PORTC = 0; PORTD = 0;
566 asm volatile("jmp 0x3E00");
567 #elif defined(__AVR_ATmega32U4__) // Teensy 2.0
568 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
569 TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
570 DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
571 PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
572 asm volatile("jmp 0x7E00");
573 #elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
574 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
575 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
576 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
577 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
578 asm volatile("jmp 0xFC00");
579 #elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
580 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
581 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
582 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
583 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
584 asm volatile("jmp 0x1FC00");
589 // WDT Setup for software reset the chip
601 USB_FREEZE(); // enable USB
602 PLL_CONFIG(); // config PLL
603 while (!(PLLCSR & (1<<PLOCK))) ; // wait for PLL lock
604 USB_CONFIG(); // start USB clock
605 UDCON = 0; // enable attach resistor
606 usb_configuration = 0;
607 UDIEN = (1<<EORSTE) | (1<<SOFE);
610 // Disable watchdog timer after possible software reset
611 //wdt_init(); // XXX Not working...seems to be ok without this, not sure though
614 // return 0 if the USB is not configured, or the configuration
615 // number selected by the HOST
616 uint8_t usb_configured()
618 return usb_configuration;
621 // USB Device Interrupt - handle all device-level events
622 // the transmit buffer flushing is triggered by the start of frame
626 uint8_t intbits, t_cdc;
630 if ( intbits & (1 << EORSTI) )
634 UECFG0X = EP_TYPE_CONTROL;
635 UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
636 UEIENX = (1 << RXSTPE);
637 usb_configuration = 0;
640 if ( (intbits & (1 << SOFI)) && usb_configuration )
642 t_cdc = transmit_flush_timer;
645 transmit_flush_timer = --t_cdc;
648 UENUM = CDC_TX_ENDPOINT;
652 static uint8_t div4 = 0;
653 if ( USBKeys_Idle_Config && (++div4 & 3) == 0 )
655 USBKeys_Idle_Count++;
656 if ( USBKeys_Idle_Count == USBKeys_Idle_Config )
658 // XXX TODO Is this even used? If so, when? -Jacob
659 // From hasu's code, this section looks like it could fix the Mac SET_IDLE problem
660 // Send normal keyboard interrupt packet(s)
661 switch ( USBKeys_Protocol )
663 // Send boot keyboard interrupt packet(s)
664 case 0: usb_keyboard_toHost(); break;
665 // Send NKRO keyboard interrupts packet(s)
666 //case 1: usb_nkrokeyboard_toHost(); break; // XXX Not valid anymore
676 // Misc functions to wait for ready and send/receive packets
677 static inline void usb_wait_in_ready()
679 while (!(UEINTX & (1<<TXINI))) ;
681 static inline void usb_send_in()
683 UEINTX = ~(1<<TXINI);
685 static inline void usb_wait_receive_out()
687 while (!(UEINTX & (1<<RXOUTI))) ;
689 static inline void usb_ack_out()
691 UEINTX = ~(1<<RXOUTI);
696 // USB Endpoint Interrupt - endpoint 0 is handled here. The
697 // other endpoints are manipulated by the user-callable
698 // functions, and the start-of-frame interrupt.
705 uint8_t i, n, len, en;
707 uint8_t bmRequestType;
713 const uint8_t *desc_addr;
718 if (intbits & (1<<RXSTPI))
720 bmRequestType = UEDATX;
723 wValue |= (UEDATX << 8);
725 wIndex |= (UEDATX << 8);
727 wLength |= (UEDATX << 8);
728 UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
730 if ( bRequest == GET_DESCRIPTOR )
732 list = (const uint8_t *)descriptor_list;
735 if ( i >= NUM_DESC_LIST )
737 UECONX = (1 << STALLRQ) | (1 << EPEN); //stall
740 desc_val = pgm_read_word(list);
741 if ( desc_val != wValue )
743 list += sizeof( struct descriptor_list_struct );
747 desc_val = pgm_read_word(list);
748 if ( desc_val != wIndex )
750 list += sizeof(struct descriptor_list_struct) - 2;
754 desc_addr = (const uint8_t *)pgm_read_word(list);
756 desc_length = pgm_read_byte(list);
759 len = (wLength < 256) ? wLength : 255;
760 if (len > desc_length) len = desc_length;
762 // wait for host ready for IN packet
765 } while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
766 if (i & (1<<RXOUTI)) return; // abort
768 n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
769 for (i = n; i; i--) {
770 UEDATX = pgm_read_byte(desc_addr++);
774 } while (len || n == ENDPOINT0_SIZE);
778 if (bRequest == SET_ADDRESS) {
781 UDADDR = wValue | (1<<ADDEN);
785 if ( bRequest == SET_CONFIGURATION && bmRequestType == 0 )
787 usb_configuration = wValue;
789 transmit_flush_timer = 0;
791 cfg = endpoint_config_table;
792 // Setup each of the 6 additional endpoints (0th already configured)
793 for ( i = 1; i < 6; i++ )
796 en = pgm_read_byte(cfg++);
800 UECFG0X = pgm_read_byte(cfg++);
801 UECFG1X = pgm_read_byte(cfg++);
809 if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
811 UEDATX = usb_configuration;
816 if ( ( wIndex == KEYBOARD_INTERFACE && USBKeys_Protocol == 0 )
817 || ( wIndex == KEYBOARD_NKRO_INTERFACE && USBKeys_Protocol == 1 ) )
819 if ( bmRequestType == 0xA1)
821 if ( bRequest == HID_GET_REPORT )
825 // Send normal keyboard interrupt packet(s)
826 switch ( USBKeys_Protocol )
828 // Send boot keyboard interrupt packet(s)
829 case 0: usb_keyboard_toHost(); break;
830 // Send NKRO keyboard interrupts packet(s)
831 //case 1: usb_nkrokeyboard_toHost(); break; // XXX Not valid anymore
837 if ( bRequest == HID_GET_IDLE )
840 UEDATX = USBKeys_Idle_Config;
844 if ( bRequest == HID_GET_PROTOCOL )
847 UEDATX = USBKeys_Protocol;
852 if ( bmRequestType == 0x21 )
854 if ( bRequest == HID_SET_REPORT )
856 usb_wait_receive_out();
857 USBKeys_LEDs = UEDATX;
862 if ( bRequest == HID_SET_IDLE )
865 USBKeys_Idle_Config = (wValue >> 8);
866 USBKeys_Idle_Count = 0;
871 if ( bRequest == HID_SET_PROTOCOL )
874 USBKeys_Protocol = wValue; // 0 - Boot Mode, 1 - NKRO Mode
882 if (bRequest == CDC_GET_LINE_CODING && bmRequestType == 0xA1) {
885 for (i=0; i<7; i++) {
892 if (bRequest == CDC_SET_LINE_CODING && bmRequestType == 0x21) {
893 usb_wait_receive_out();
895 for (i=0; i<7; i++) {
903 if (bRequest == CDC_SET_CONTROL_LINE_STATE && bmRequestType == 0x21) {
904 cdc_line_rtsdtr = wValue;
910 if (bRequest == GET_STATUS) {
913 if (bmRequestType == 0x82) {
915 if (UECONX & (1<<STALLRQ)) i = 1;
924 if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
925 && bmRequestType == 0x02 && wValue == 0) {
927 if (i >= 1 && i <= MAX_ENDPOINT) {
930 if (bRequest == SET_FEATURE) {
931 UECONX = (1<<STALLRQ)|(1<<EPEN);
933 UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
941 UECONX = (1 << STALLRQ) | (1 << EPEN); // stall