USB/pjrc/usb_keyboard_debug.c

   1 /* USB Keyboard Plus Debug Channel Example for Teensy USB Development Board
   2  * http://www.pjrc.com/teensy/usb_keyboard.html
   3  * Copyright (c) 2009 PJRC.COM, LLC
   4  *
   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:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  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
  21  * THE SOFTWARE.
  22  */
  23
  24 // Version 1.0: Initial Release
  25 // Version 1.1: Add support for Teensy 2.0
  26
  27 #define USB_SERIAL_PRIVATE_INCLUDE
  28 #include "usb_keyboard_debug.h"
  29
  30 /**************************************************************************
  31  *
  32  *  Configurable Options
  33  *
  34  **************************************************************************/
  35
  36 // USB devices are supposed to implment a halt feature, which is
  37 // rarely (if ever) used.  If you comment this line out, the halt
  38 // code will be removed, saving 102 bytes of space (gcc 4.3.0).
  39 // This is not strictly USB compliant, but works with all major
  40 // operating systems.
  41 #define SUPPORT_ENDPOINT_HALT
  42
  43
  44
  45 /**************************************************************************
  46  *
  47  *  Endpoint Buffer Configuration
  48  *
  49  **************************************************************************/
  50
  51 #define ENDPOINT0_SIZE          32
  52
  53 #define KEYBOARD_INTERFACE      0
  54 #define KEYBOARD_ENDPOINT       3
  55 #define KEYBOARD_SIZE           8
  56 #define KEYBOARD_BUFFER         EP_DOUBLE_BUFFER
  57
  58 #define DEBUG_INTERFACE         1
  59 #define DEBUG_TX_ENDPOINT       4
  60 #define DEBUG_TX_SIZE           32
  61 #define DEBUG_TX_BUFFER         EP_DOUBLE_BUFFER
  62
  63 static const uint8_t PROGMEM endpoint_config_table[] = {
  64         0,
  65         0,
  66         1, EP_TYPE_INTERRUPT_IN,  EP_SIZE(KEYBOARD_SIZE) | KEYBOARD_BUFFER,
  67         1, EP_TYPE_INTERRUPT_IN,  EP_SIZE(DEBUG_TX_SIZE) | DEBUG_TX_BUFFER
  68 };
  69
  70
  71 /**************************************************************************
  72  *
  73  *  Descriptor Data
  74  *
  75  **************************************************************************/
  76
  77 // Descriptors are the data that your computer reads when it auto-detects
  78 // this USB device (called "enumeration" in USB lingo).  The most commonly
  79 // changed items are editable at the top of this file.  Changing things
  80 // in here should only be done by those who've read chapter 9 of the USB
  81 // spec and relevant portions of any USB class specifications!
  82
  83
  84 static const uint8_t PROGMEM device_descriptor[] = {
  85         18,                                     // bLength
  86         1,                                      // bDescriptorType
  87         0x00, 0x02,                             // bcdUSB
  88         0,                                      // bDeviceClass
  89         0,                                      // bDeviceSubClass
  90         0,                                      // bDeviceProtocol
  91         ENDPOINT0_SIZE,                         // bMaxPacketSize0
  92         LSB(VENDOR_ID), MSB(VENDOR_ID),         // idVendor
  93         LSB(PRODUCT_ID), MSB(PRODUCT_ID),       // idProduct
  94         0x00, 0x01,                             // bcdDevice
  95         1,                                      // iManufacturer
  96         2,                                      // iProduct
  97         0,                                      // iSerialNumber
  98         1                                       // bNumConfigurations
  99 };
 100
 101 // Keyboard Protocol 1, HID 1.11 spec, Appendix B, page 59-60
 102 static const uint8_t PROGMEM keyboard_hid_report_desc[] = {
 103         0x05, 0x01,          // Usage Page (Generic Desktop),
 104         0x09, 0x06,          // Usage (Keyboard),
 105         0xA1, 0x01,          // Collection (Application),
 106         0x75, 0x01,          //   Report Size (1),
 107         0x95, 0x08,          //   Report Count (8),
 108         0x05, 0x07,          //   Usage Page (Key Codes),
 109         0x19, 0xE0,          //   Usage Minimum (224),
 110         0x29, 0xE7,          //   Usage Maximum (231),
 111         0x15, 0x00,          //   Logical Minimum (0),
 112         0x25, 0x01,          //   Logical Maximum (1),
 113         0x81, 0x02,          //   Input (Data, Variable, Absolute), ;Modifier byte
 114         0x95, 0x01,          //   Report Count (1),
 115         0x75, 0x08,          //   Report Size (8),
 116         0x81, 0x03,          //   Input (Constant),                 ;Reserved byte
 117         0x95, 0x05,          //   Report Count (5),
 118         0x75, 0x01,          //   Report Size (1),
 119         0x05, 0x08,          //   Usage Page (LEDs),
 120         0x19, 0x01,          //   Usage Minimum (1),
 121         0x29, 0x05,          //   Usage Maximum (5),
 122         0x91, 0x02,          //   Output (Data, Variable, Absolute), ;LED report
 123         0x95, 0x01,          //   Report Count (1),
 124         0x75, 0x03,          //   Report Size (3),
 125         0x91, 0x03,          //   Output (Constant),                 ;LED report padding
 126         0x95, 0x06,          //   Report Count (6),
 127         0x75, 0x08,          //   Report Size (8),
 128         0x15, 0x00,          //   Logical Minimum (0),
 129         0x25, 0x68,          //   Logical Maximum(104),
 130         0x05, 0x07,          //   Usage Page (Key Codes),
 131         0x19, 0x00,          //   Usage Minimum (0),
 132         0x29, 0x68,          //   Usage Maximum (104),
 133         0x81, 0x00,          //   Input (Data, Array),
 134         0xc0                 // End Collection
 135 };
 136
 137 static const uint8_t PROGMEM debug_hid_report_desc[] = {
 138         //0x06, 0x30, 0xFF,                     // Usage Page 0xFF31 (vendor defined)
 139         0x06, 0x31, 0xFF,                       // Usage Page 0xFF31 (vendor defined)
 140         0x09, 0x74,                             // Usage 0x74
 141         0xA1, 0x53,                             // Collection 0x53
 142         0x75, 0x08,                             // report size = 8 bits
 143         0x15, 0x00,                             // logical minimum = 0
 144         0x26, 0xFF, 0x00,                       // logical maximum = 255
 145         0x95, DEBUG_TX_SIZE,                    // report count
 146         0x09, 0x75,                             // usage
 147         0x81, 0x02,                             // Input (array)
 148         0xC0                                    // end collection
 149 };
 150
 151 #define CONFIG1_DESC_SIZE        (9+9+9+7+9+9+7)
 152 #define KEYBOARD_HID_DESC_OFFSET (9+9)
 153 #define DEBUG_HID_DESC_OFFSET    (9+9+9+7+9)
 154 static const uint8_t PROGMEM config1_descriptor[CONFIG1_DESC_SIZE] = {
 155         // configuration descriptor, USB spec 9.6.3, page 264-266, Table 9-10
 156         9,                                      // bLength;
 157         2,                                      // bDescriptorType;
 158         LSB(CONFIG1_DESC_SIZE),                 // wTotalLength
 159         MSB(CONFIG1_DESC_SIZE),
 160         2,                                      // bNumInterfaces
 161         1,                                      // bConfigurationValue
 162         0,                                      // iConfiguration
 163         0xC0,                                   // bmAttributes
 164         50,                                     // bMaxPower
 165         // interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
 166         9,                                      // bLength
 167         4,                                      // bDescriptorType
 168         KEYBOARD_INTERFACE,                     // bInterfaceNumber
 169         0,                                      // bAlternateSetting
 170         1,                                      // bNumEndpoints
 171         0x03,                                   // bInterfaceClass (0x03 = HID)
 172         0x01,                                   // bInterfaceSubClass (0x01 = Boot)
 173         0x01,                                   // bInterfaceProtocol (0x01 = Keyboard)
 174         0,                                      // iInterface
 175         // HID interface descriptor, HID 1.11 spec, section 6.2.1
 176         9,                                      // bLength
 177         0x21,                                   // bDescriptorType
 178         0x11, 0x01,                             // bcdHID
 179         0,                                      // bCountryCode
 180         1,                                      // bNumDescriptors
 181         0x22,                                   // bDescriptorType
 182         sizeof(keyboard_hid_report_desc),       // wDescriptorLength
 183         0,
 184         // endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
 185         7,                                      // bLength
 186         5,                                      // bDescriptorType
 187         KEYBOARD_ENDPOINT | 0x80,               // bEndpointAddress
 188         0x03,                                   // bmAttributes (0x03=intr)
 189         KEYBOARD_SIZE, 0,                       // wMaxPacketSize
 190         1,                                      // bInterval
 191         // interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
 192         9,                                      // bLength
 193         4,                                      // bDescriptorType
 194         DEBUG_INTERFACE,                        // bInterfaceNumber
 195         0,                                      // bAlternateSetting
 196         1,                                      // bNumEndpoints
 197         0x03,                                   // bInterfaceClass (0x03 = HID)
 198         0x00,                                   // bInterfaceSubClass
 199         0x00,                                   // bInterfaceProtocol
 200         0,                                      // iInterface
 201         // HID interface descriptor, HID 1.11 spec, section 6.2.1
 202         9,                                      // bLength
 203         0x21,                                   // bDescriptorType
 204         0x11, 0x01,                             // bcdHID
 205         0,                                      // bCountryCode
 206         1,                                      // bNumDescriptors
 207         0x22,                                   // bDescriptorType
 208         sizeof(debug_hid_report_desc),          // wDescriptorLength
 209         0,
 210         // endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
 211         7,                                      // bLength
 212         5,                                      // bDescriptorType
 213         DEBUG_TX_ENDPOINT | 0x80,               // bEndpointAddress
 214         0x03,                                   // bmAttributes (0x03=intr)
 215         DEBUG_TX_SIZE, 0,                       // wMaxPacketSize
 216         1                                       // bInterval
 217 };
 218
 219 // If you're desperate for a little extra code memory, these strings
 220 // can be completely removed if iManufacturer, iProduct, iSerialNumber
 221 // in the device desciptor are changed to zeros.
 222 struct usb_string_descriptor_struct {
 223         uint8_t bLength;
 224         uint8_t bDescriptorType;
 225         int16_t wString[];
 226 };
 227 static const struct usb_string_descriptor_struct PROGMEM string0 = {
 228         4,
 229         3,
 230         {0x0409}
 231 };
 232 static const struct usb_string_descriptor_struct PROGMEM string1 = {
 233         sizeof(STR_MANUFACTURER),
 234         3,
 235         STR_MANUFACTURER
 236 };
 237 static const struct usb_string_descriptor_struct PROGMEM string2 = {
 238         sizeof(STR_PRODUCT),
 239         3,
 240         STR_PRODUCT
 241 };
 242
 243 // This table defines which descriptor data is sent for each specific
 244 // request from the host (in wValue and wIndex).
 245 static const struct descriptor_list_struct {
 246         uint16_t        wValue;
 247         uint16_t        wIndex;
 248         const uint8_t   *addr;
 249         uint8_t         length;
 250 } PROGMEM descriptor_list[] = {
 251         {0x0100, 0x0000, device_descriptor, sizeof(device_descriptor)},
 252         {0x0200, 0x0000, config1_descriptor, sizeof(config1_descriptor)},
 253         {0x2200, KEYBOARD_INTERFACE, keyboard_hid_report_desc, sizeof(keyboard_hid_report_desc)},
 254         {0x2100, KEYBOARD_INTERFACE, config1_descriptor+KEYBOARD_HID_DESC_OFFSET, 9},
 255         {0x2200, DEBUG_INTERFACE, debug_hid_report_desc, sizeof(debug_hid_report_desc)},
 256         {0x2100, DEBUG_INTERFACE, config1_descriptor+DEBUG_HID_DESC_OFFSET, 9},
 257         {0x0300, 0x0000, (const uint8_t *)&string0, 4},
 258         {0x0301, 0x0409, (const uint8_t *)&string1, sizeof(STR_MANUFACTURER)},
 259         {0x0302, 0x0409, (const uint8_t *)&string2, sizeof(STR_PRODUCT)}
 260 };
 261 #define NUM_DESC_LIST (sizeof(descriptor_list)/sizeof(struct descriptor_list_struct))
 262
 263
 264 /**************************************************************************
 265  *
 266  *  Variables - these are the only non-stack RAM usage
 267  *
 268  **************************************************************************/
 269
 270 // zero when we are not configured, non-zero when enumerated
 271 static volatile uint8_t usb_configuration=0;
 272
 273 // the time remaining before we transmit any partially full
 274 // packet, or send a zero length packet.
 275 static volatile uint8_t debug_flush_timer=0;
 276
 277 // protocol setting from the host.  We use exactly the same report
 278 // either way, so this variable only stores the setting since we
 279 // are required to be able to report which setting is in use.
 280 static uint8_t keyboard_protocol=1;
 281
 282 // the idle configuration, how often we send the report to the
 283 // host (ms * 4) even when it hasn't changed
 284 static uint8_t keyboard_idle_config=125;
 285
 286 // count until idle timeout
 287 static uint8_t keyboard_idle_count=0;
 288
 289
 290 /**************************************************************************
 291  *
 292  *  Public Functions - these are the API intended for the user
 293  *
 294  **************************************************************************/
 295
 296
 297 // initialize USB
 298 void usb_init(void)
 299 {
 300         HW_CONFIG();
 301         USB_FREEZE();                           // enable USB
 302         PLL_CONFIG();                           // config PLL
 303         while (!(PLLCSR & (1<<PLOCK))) ;        // wait for PLL lock
 304         USB_CONFIG();                           // start USB clock
 305         UDCON = 0;                              // enable attach resistor
 306         usb_configuration = 0;
 307         UDIEN = (1<<EORSTE)|(1<<SOFE);
 308         sei();
 309 }
 310
 311 // return 0 if the USB is not configured, or the configuration
 312 // number selected by the HOST
 313 uint8_t usb_configured(void)
 314 {
 315         return usb_configuration;
 316 }
 317
 318
 319 // perform a single keystroke
 320 int8_t usb_keyboard_press(uint8_t key, uint8_t modifier)
 321 {
 322         int8_t r;
 323
 324         USBKeys_Modifiers = modifier;
 325         USBKeys_Array[0] = key;
 326         r = usb_keyboard_send();
 327         if (r) return r;
 328         USBKeys_Modifiers = 0;
 329         USBKeys_Array[0] = 0;
 330         return usb_keyboard_send();
 331 }
 332
 333 // send the contents of USBKeys_Array and USBKeys_Modifiers
 334 int8_t usb_keyboard_send(void)
 335 {
 336         uint8_t i, intr_state, timeout;
 337
 338         if (!usb_configuration) return -1;
 339         intr_state = SREG;
 340         cli();
 341         UENUM = KEYBOARD_ENDPOINT;
 342         timeout = UDFNUML + 50;
 343         while (1) {
 344                 // are we ready to transmit?
 345                 if (UEINTX & (1<<RWAL)) break;
 346                 SREG = intr_state;
 347                 // has the USB gone offline?
 348                 if (!usb_configuration) return -1;
 349                 // have we waited too long?
 350                 if (UDFNUML == timeout) return -1;
 351                 // get ready to try checking again
 352                 intr_state = SREG;
 353                 cli();
 354                 UENUM = KEYBOARD_ENDPOINT;
 355         }
 356         UEDATX = USBKeys_Modifiers;
 357         UEDATX = 0;
 358         for (i=0; i<6; i++) {
 359                 UEDATX = USBKeys_Array[i];
 360         }
 361         UEINTX = 0x3A;
 362         keyboard_idle_count = 0;
 363         SREG = intr_state;
 364         return 0;
 365 }
 366
 367 // transmit a character.  0 returned on success, -1 on error
 368 int8_t usb_debug_putchar(uint8_t c)
 369 {
 370         static uint8_t previous_timeout=0;
 371         uint8_t timeout, intr_state;
 372
 373         // if we're not online (enumerated and configured), error
 374         if (!usb_configuration) return -1;
 375         // interrupts are disabled so these functions can be
 376         // used from the main program or interrupt context,
 377         // even both in the same program!
 378         intr_state = SREG;
 379         cli();
 380         UENUM = DEBUG_TX_ENDPOINT;
 381         // if we gave up due to timeout before, don't wait again
 382         if (previous_timeout) {
 383                 if (!(UEINTX & (1<<RWAL))) {
 384                         SREG = intr_state;
 385                         return -1;
 386                 }
 387                 previous_timeout = 0;
 388         }
 389         // wait for the FIFO to be ready to accept data
 390         timeout = UDFNUML + 4;
 391         while (1) {
 392                 // are we ready to transmit?
 393                 if (UEINTX & (1<<RWAL)) break;
 394                 SREG = intr_state;
 395                 // have we waited too long?
 396                 if (UDFNUML == timeout) {
 397                         previous_timeout = 1;
 398                         return -1;
 399                 }
 400                 // has the USB gone offline?
 401                 if (!usb_configuration) return -1;
 402                 // get ready to try checking again
 403                 intr_state = SREG;
 404                 cli();
 405                 UENUM = DEBUG_TX_ENDPOINT;
 406         }
 407         // actually write the byte into the FIFO
 408         UEDATX = c;
 409         // if this completed a packet, transmit it now!
 410         if (!(UEINTX & (1<<RWAL))) {
 411                 UEINTX = 0x3A;
 412                 debug_flush_timer = 0;
 413         } else {
 414                 debug_flush_timer = 2;
 415         }
 416         SREG = intr_state;
 417         return 0;
 418 }
 419
 420
 421 // immediately transmit any buffered output.
 422 void usb_debug_flush_output(void)
 423 {
 424         uint8_t intr_state;
 425
 426         intr_state = SREG;
 427         cli();
 428         if (debug_flush_timer) {
 429                 UENUM = DEBUG_TX_ENDPOINT;
 430                 while ((UEINTX & (1<<RWAL))) {
 431                         UEDATX = 0;
 432                 }
 433                 UEINTX = 0x3A;
 434                 debug_flush_timer = 0;
 435         }
 436         SREG = intr_state;
 437 }
 438
 439
 440
 441 /**************************************************************************
 442  *
 443  *  Private Functions - not intended for general user consumption....
 444  *
 445  **************************************************************************/
 446
 447
 448
 449 // USB Device Interrupt - handle all device-level events
 450 // the transmit buffer flushing is triggered by the start of frame
 451 //
 452 ISR(USB_GEN_vect)
 453 {
 454         uint8_t intbits, t, i;
 455         static uint8_t div4=0;
 456
 457         intbits = UDINT;
 458         UDINT = 0;
 459         if (intbits & (1<<EORSTI)) {
 460                 UENUM = 0;
 461                 UECONX = 1;
 462                 UECFG0X = EP_TYPE_CONTROL;
 463                 UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
 464                 UEIENX = (1<<RXSTPE);
 465                 usb_configuration = 0;
 466         }
 467         if ((intbits & (1<<SOFI)) && usb_configuration) {
 468                 t = debug_flush_timer;
 469                 if (t) {
 470                         debug_flush_timer = -- t;
 471                         if (!t) {
 472                                 UENUM = DEBUG_TX_ENDPOINT;
 473                                 while ((UEINTX & (1<<RWAL))) {
 474                                         UEDATX = 0;
 475                                 }
 476                                 UEINTX = 0x3A;
 477                         }
 478                 }
 479                 if (keyboard_idle_config && (++div4 & 3) == 0) {
 480                         UENUM = KEYBOARD_ENDPOINT;
 481                         if (UEINTX & (1<<RWAL)) {
 482                                 keyboard_idle_count++;
 483                                 if (keyboard_idle_count == keyboard_idle_config) {
 484                                         keyboard_idle_count = 0;
 485                                         UEDATX = USBKeys_Modifiers;
 486                                         UEDATX = 0;
 487                                         for (i=0; i<6; i++) {
 488                                                 UEDATX = USBKeys_Array[i];
 489                                         }
 490                                         UEINTX = 0x3A;
 491                                 }
 492                         }
 493                 }
 494         }
 495 }
 496
 497
 498
 499 // Misc functions to wait for ready and send/receive packets
 500 static inline void usb_wait_in_ready(void)
 501 {
 502         while (!(UEINTX & (1<<TXINI))) ;
 503 }
 504 static inline void usb_send_in(void)
 505 {
 506         UEINTX = ~(1<<TXINI);
 507 }
 508 static inline void usb_wait_receive_out(void)
 509 {
 510         while (!(UEINTX & (1<<RXOUTI))) ;
 511 }
 512 static inline void usb_ack_out(void)
 513 {
 514         UEINTX = ~(1<<RXOUTI);
 515 }
 516
 517
 518
 519 // USB Endpoint Interrupt - endpoint 0 is handled here.  The
 520 // other endpoints are manipulated by the user-callable
 521 // functions, and the start-of-frame interrupt.
 522 //
 523 ISR(USB_COM_vect)
 524 {
 525         uint8_t intbits;
 526         const uint8_t *list;
 527         const uint8_t *cfg;
 528         uint8_t i, n, len, en;
 529         uint8_t bmRequestType;
 530         uint8_t bRequest;
 531         uint16_t wValue;
 532         uint16_t wIndex;
 533         uint16_t wLength;
 534         uint16_t desc_val;
 535         const uint8_t *desc_addr;
 536         uint8_t desc_length;
 537
 538         UENUM = 0;
 539         intbits = UEINTX;
 540         if (intbits & (1<<RXSTPI)) {
 541                 bmRequestType = UEDATX;
 542                 bRequest = UEDATX;
 543                 wValue = UEDATX;
 544                 wValue |= (UEDATX << 8);
 545                 wIndex = UEDATX;
 546                 wIndex |= (UEDATX << 8);
 547                 wLength = UEDATX;
 548                 wLength |= (UEDATX << 8);
 549                 UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
 550                 if (bRequest == GET_DESCRIPTOR) {
 551                         list = (const uint8_t *)descriptor_list;
 552                         for (i=0; ; i++) {
 553                                 if (i >= NUM_DESC_LIST) {
 554                                         UECONX = (1<<STALLRQ)|(1<<EPEN);  //stall
 555                                         return;
 556                                 }
 557                                 desc_val = pgm_read_word(list);
 558                                 if (desc_val != wValue) {
 559                                         list += sizeof(struct descriptor_list_struct);
 560                                         continue;
 561                                 }
 562                                 list += 2;
 563                                 desc_val = pgm_read_word(list);
 564                                 if (desc_val != wIndex) {
 565                                         list += sizeof(struct descriptor_list_struct)-2;
 566                                         continue;
 567                                 }
 568                                 list += 2;
 569                                 desc_addr = (const uint8_t *)pgm_read_word(list);
 570                                 list += 2;
 571                                 desc_length = pgm_read_byte(list);
 572                                 break;
 573                         }
 574                         len = (wLength < 256) ? wLength : 255;
 575                         if (len > desc_length) len = desc_length;
 576                         do {
 577                                 // wait for host ready for IN packet
 578                                 do {
 579                                         i = UEINTX;
 580                                 } while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
 581                                 if (i & (1<<RXOUTI)) return;    // abort
 582                                 // send IN packet
 583                                 n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
 584                                 for (i = n; i; i--) {
 585                                         UEDATX = pgm_read_byte(desc_addr++);
 586                                 }
 587                                 len -= n;
 588                                 usb_send_in();
 589                         } while (len || n == ENDPOINT0_SIZE);
 590                         return;
 591                 }
 592                 if (bRequest == SET_ADDRESS) {
 593                         usb_send_in();
 594                         usb_wait_in_ready();
 595                         UDADDR = wValue | (1<<ADDEN);
 596                         return;
 597                 }
 598                 if (bRequest == SET_CONFIGURATION && bmRequestType == 0) {
 599                         usb_configuration = wValue;
 600                         usb_send_in();
 601                         cfg = endpoint_config_table;
 602                         for (i=1; i<5; i++) {
 603                                 UENUM = i;
 604                                 en = pgm_read_byte(cfg++);
 605                                 UECONX = en;
 606                                 if (en) {
 607                                         UECFG0X = pgm_read_byte(cfg++);
 608                                         UECFG1X = pgm_read_byte(cfg++);
 609                                 }
 610                         }
 611                         UERST = 0x1E;
 612                         UERST = 0;
 613                         return;
 614                 }
 615                 if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
 616                         usb_wait_in_ready();
 617                         UEDATX = usb_configuration;
 618                         usb_send_in();
 619                         return;
 620                 }
 621
 622                 if (bRequest == GET_STATUS) {
 623                         usb_wait_in_ready();
 624                         i = 0;
 625                         #ifdef SUPPORT_ENDPOINT_HALT
 626                         if (bmRequestType == 0x82) {
 627                                 UENUM = wIndex;
 628                                 if (UECONX & (1<<STALLRQ)) i = 1;
 629                                 UENUM = 0;
 630                         }
 631                         #endif
 632                         UEDATX = i;
 633                         UEDATX = 0;
 634                         usb_send_in();
 635                         return;
 636                 }
 637                 #ifdef SUPPORT_ENDPOINT_HALT
 638                 if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
 639                   && bmRequestType == 0x02 && wValue == 0) {
 640                         i = wIndex & 0x7F;
 641                         if (i >= 1 && i <= MAX_ENDPOINT) {
 642                                 usb_send_in();
 643                                 UENUM = i;
 644                                 if (bRequest == SET_FEATURE) {
 645                                         UECONX = (1<<STALLRQ)|(1<<EPEN);
 646                                 } else {
 647                                         UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
 648                                         UERST = (1 << i);
 649                                         UERST = 0;
 650                                 }
 651                                 return;
 652                         }
 653                 }
 654                 #endif
 655                 if (wIndex == KEYBOARD_INTERFACE) {
 656                         if (bmRequestType == 0xA1) {
 657                                 if (bRequest == HID_GET_REPORT) {
 658                                         usb_wait_in_ready();
 659                                         UEDATX = USBKeys_Modifiers;
 660                                         UEDATX = 0;
 661                                         for (i=0; i<6; i++) {
 662                                                 UEDATX = USBKeys_Array[i];
 663                                         }
 664                                         usb_send_in();
 665                                         return;
 666                                 }
 667                                 if (bRequest == HID_GET_IDLE) {
 668                                         usb_wait_in_ready();
 669                                         UEDATX = keyboard_idle_config;
 670                                         usb_send_in();
 671                                         return;
 672                                 }
 673                                 if (bRequest == HID_GET_PROTOCOL) {
 674                                         usb_wait_in_ready();
 675                                         UEDATX = keyboard_protocol;
 676                                         usb_send_in();
 677                                         return;
 678                                 }
 679                         }
 680                         if (bmRequestType == 0x21) {
 681                                 if (bRequest == HID_SET_REPORT) {
 682                                         usb_wait_receive_out();
 683                                         USBKeys_LEDs = UEDATX;
 684                                         usb_ack_out();
 685                                         usb_send_in();
 686                                         return;
 687                                 }
 688                                 if (bRequest == HID_SET_IDLE) {
 689                                         keyboard_idle_config = (wValue >> 8);
 690                                         keyboard_idle_count = 0;
 691                                         //usb_wait_in_ready();
 692                                         usb_send_in();
 693                                         return;
 694                                 }
 695                                 if (bRequest == HID_SET_PROTOCOL) {
 696                                         keyboard_protocol = wValue;
 697                                         //usb_wait_in_ready();
 698                                         usb_send_in();
 699                                         return;
 700                                 }
 701                         }
 702                 }
 703                 if (wIndex == DEBUG_INTERFACE) {
 704                         if (bRequest == HID_GET_REPORT && bmRequestType == 0xA1) {
 705                                 len = wLength;
 706                                 do {
 707                                         // wait for host ready for IN packet
 708                                         do {
 709                                                 i = UEINTX;
 710                                         } while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
 711                                         if (i & (1<<RXOUTI)) return;    // abort
 712                                         // send IN packet
 713                                         n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
 714                                         for (i = n; i; i--) {
 715                                                 UEDATX = 0;
 716                                         }
 717                                         len -= n;
 718                                         usb_send_in();
 719                                 } while (len || n == ENDPOINT0_SIZE);
 720                                 return;
 721                         }
 722                 }
 723         }
 724         UECONX = (1<<STALLRQ) | (1<<EPEN);      // stall
 725 }
 726
 727