Output/pjrcUSB/avr/usb_keyboard_serial.c

   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)
   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
  25 // Local Includes
  26 #include "usb_keyboard_serial.h"
  27 #include <print.h>
  28
  29
  30 // ----- Variables -----
  31
  32 // zero when we are not configured, non-zero when enumerated
  33 static volatile uint8_t usb_configuration = 0;
  34
  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;
  39
  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;
  44
  45
  46
  47 // ----- USB Keyboard Functions -----
  48
  49 // Sends normal keyboard out to host
  50 // NOTE: Make sure to match the descriptor
  51 void usb_keyboard_toHost()
  52 {
  53         uint8_t i;
  54
  55         // Modifiers
  56         UEDATX = USBKeys_Modifiers;
  57
  58         // Reserved Byte
  59         UEDATX = 0x00;
  60
  61         // Normal Keys, only supports 6 in Boot mode
  62         for ( i = 0; i < 6; i++)
  63         {
  64                 UEDATX = USBKeys_Keys[i];
  65         }
  66         UEINTX = 0x00;
  67 }
  68
  69 // send the contents of USBKeys_Keys and USBKeys_Modifiers
  70 inline void usb_keyboard_send()
  71 {
  72         uint8_t intr_state, timeout;
  73
  74         intr_state = SREG;
  75         timeout = UDFNUML + 50;
  76
  77         // Ready to transmit keypresses?
  78         do
  79         {
  80                 SREG = intr_state;
  81
  82                 // has the USB gone offline? or exceeded timeout?
  83                 if ( !usb_configuration || UDFNUML == timeout )
  84                 {
  85                         erro_print("USB Offline? Timeout?");
  86                         return;
  87                 }
  88
  89                 // get ready to try checking again
  90                 intr_state = SREG;
  91                 cli();
  92
  93                 // If not using Boot protocol, send NKRO
  94                 UENUM = USBKeys_Protocol ? KEYBOARD_NKRO_ENDPOINT : KEYBOARD_ENDPOINT;
  95         } while ( !( UEINTX & (1 << RWAL) ) );
  96
  97         switch ( USBKeys_Protocol )
  98         {
  99         // Send boot keyboard interrupt packet(s)
 100         case 0:
 101                 usb_keyboard_toHost();
 102                 USBKeys_Changed = USBKeyChangeState_None;
 103                 break;
 104
 105         // Send NKRO keyboard interrupts packet(s)
 106         case 1:
 107                 // Check system control keys
 108                 if ( USBKeys_Changed & USBKeyChangeState_System )
 109                 {
 110                         UEDATX = 0x02; // ID
 111                         UEDATX = USBKeys_SysCtrl;
 112                         UEINTX = 0; // Finished with ID
 113
 114                         USBKeys_Changed &= ~USBKeyChangeState_System; // Mark sent
 115                 }
 116
 117                 // Check consumer control keys
 118                 if ( USBKeys_Changed & USBKeyChangeState_Consumer )
 119                 {
 120                         UEDATX = 0x03; // ID
 121                         UEDATX = (uint8_t)(USBKeys_ConsCtrl & 0x00FF);
 122                         UEDATX = (uint8_t)(USBKeys_ConsCtrl >> 8);
 123                         UEINTX = 0; // Finished with ID
 124
 125                         USBKeys_Changed &= ~USBKeyChangeState_Consumer; // Mark sent
 126                 }
 127
 128                 // Standard HID Keyboard
 129                 if ( USBKeys_Changed )
 130                 {
 131                         UEDATX = 0x01; // ID
 132
 133                         // Modifiers
 134                         UEDATX = USBKeys_Modifiers;
 135
 136                         // 4-49 (first 6 bytes)
 137                         for ( uint8_t byte = 0; byte < 6; byte++ )
 138                                 UEDATX = USBKeys_Keys[ byte ];
 139
 140                         // 51-155 (Middle 14 bytes)
 141                         for ( uint8_t byte = 6; byte < 20; byte++ )
 142                                 UEDATX = USBKeys_Keys[ byte ];
 143
 144                         // 157-164 (Next byte)
 145                         for ( uint8_t byte = 20; byte < 21; byte++ )
 146                                 UEDATX = USBKeys_Keys[ byte ];
 147
 148                         // 176-221 (last 6 bytes)
 149                         for ( uint8_t byte = 21; byte < 27; byte++ )
 150                                 UEDATX = USBKeys_Keys[ byte ];
 151
 152                         UEINTX = 0; // Finished with ID
 153
 154                         USBKeys_Changed = USBKeyChangeState_None; // Mark sent
 155                 }
 156
 157                 break;
 158         }
 159
 160         USBKeys_Idle_Count = 0;
 161         SREG = intr_state;
 162 }
 163
 164
 165
 166 // ----- USB Virtual Serial Port (CDC) Functions -----
 167
 168 // get the next character, or -1 if nothing received
 169 int16_t usb_serial_getchar()
 170 {
 171         uint8_t c, intr_state;
 172
 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!
 176         intr_state = SREG;
 177         cli();
 178         if (!usb_configuration) {
 179                 SREG = intr_state;
 180                 return -1;
 181         }
 182         UENUM = CDC_RX_ENDPOINT;
 183         retry:
 184         c = UEINTX;
 185         if (!(c & (1<<RWAL))) {
 186                 // no data in buffer
 187                 if (c & (1<<RXOUTI)) {
 188                         UEINTX = 0x6B;
 189                         goto retry;
 190                 }
 191                 SREG = intr_state;
 192                 return -2;
 193         }
 194         // take one byte out of the buffer
 195         c = UEDATX;
 196         // if buffer completely used, release it
 197         if (!(UEINTX & (1<<RWAL))) UEINTX = 0x6B;
 198         SREG = intr_state;
 199         return c;
 200 }
 201
 202 // number of bytes available in the receive buffer
 203 uint8_t usb_serial_available()
 204 {
 205         uint8_t n=0, i, intr_state;
 206
 207         intr_state = SREG;
 208         cli();
 209         if (usb_configuration) {
 210                 UENUM = CDC_RX_ENDPOINT;
 211                 n = UEBCLX;
 212                 if (!n) {
 213                         i = UEINTX;
 214                         if (i & (1<<RXOUTI) && !(i & (1<<RWAL))) UEINTX = 0x6B;
 215                 }
 216         }
 217         SREG = intr_state;
 218         return n;
 219 }
 220
 221 // discard any buffered input
 222 void usb_serial_flush_input()
 223 {
 224         uint8_t intr_state;
 225
 226         if (usb_configuration) {
 227                 intr_state = SREG;
 228                 cli();
 229                 UENUM = CDC_RX_ENDPOINT;
 230                 while ((UEINTX & (1<<RWAL))) {
 231                         UEINTX = 0x6B;
 232                 }
 233                 SREG = intr_state;
 234         }
 235 }
 236
 237 // transmit a character.  0 returned on success, -1 on error
 238 int8_t usb_serial_putchar( uint8_t c )
 239 {
 240         uint8_t timeout, intr_state;
 241
 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!
 247         intr_state = SREG;
 248         cli();
 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))) {
 253                         SREG = intr_state;
 254                         return -1;
 255                 }
 256                 transmit_previous_timeout = 0;
 257         }
 258         // wait for the FIFO to be ready to accept data
 259         timeout = UDFNUML + TRANSMIT_TIMEOUT;
 260         while (1) {
 261                 // are we ready to transmit?
 262                 if (UEINTX & (1<<RWAL)) break;
 263                 SREG = intr_state;
 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;
 268                         return -1;
 269                 }
 270                 // has the USB gone offline?
 271                 if (!usb_configuration) return -1;
 272                 // get ready to try checking again
 273                 intr_state = SREG;
 274                 cli();
 275                 UENUM = CDC_TX_ENDPOINT;
 276         }
 277         // actually write the byte into the FIFO
 278         UEDATX = c;
 279         // if this completed a packet, transmit it now!
 280         if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
 281         transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
 282         SREG = intr_state;
 283         return 0;
 284 }
 285
 286
 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 )
 290 {
 291         uint8_t intr_state;
 292
 293         if (!usb_configuration) return -1;
 294         intr_state = SREG;
 295         cli();
 296         UENUM = CDC_TX_ENDPOINT;
 297         if (!(UEINTX & (1<<RWAL))) {
 298                 // buffer is full
 299                 SREG = intr_state;
 300                 return -2;
 301         }
 302         // actually write the byte into the FIFO
 303         UEDATX = c;
 304                 // if this completed a packet, transmit it now!
 305         if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
 306         transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
 307         SREG = intr_state;
 308         return 0;
 309 }
 310
 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)
 322
 323 int8_t usb_serial_write( const char *buffer, uint16_t size )
 324 {
 325         uint8_t timeout, intr_state, write_size;
 326
 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!
 332         intr_state = SREG;
 333         cli();
 334         UENUM = CDC_TX_ENDPOINT;
 335         // if we gave up due to timeout before, don't wait again
 336
 337         if (transmit_previous_timeout) {
 338                 if (!(UEINTX & (1<<RWAL))) {
 339                         SREG = intr_state;
 340                         return -2;
 341                 }
 342                 transmit_previous_timeout = 0;
 343         }
 344
 345         // each iteration of this loop transmits a packet
 346         while (size) {
 347                 // wait for the FIFO to be ready to accept data
 348                 timeout = UDFNUML + TRANSMIT_TIMEOUT;
 349                 while (1) {
 350                         // are we ready to transmit?
 351                         if (UEINTX & (1<<RWAL)) break;
 352                         SREG = intr_state;
 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;
 357                                 return -3;
 358                         }
 359                         // has the USB gone offline?
 360                         if (!usb_configuration) return -4;
 361                         // get ready to try checking again
 362                         intr_state = SREG;
 363                         cli();
 364                         UENUM = CDC_TX_ENDPOINT;
 365                 }
 366
 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;
 370                 size -= write_size;
 371
 372                 // write the packet
 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++;
 407                         #endif
 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++;
 425                         #endif
 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++;
 435                         #endif
 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++;
 443                         default:
 444                         case  1: UEDATX = *buffer++;
 445                         case  0: break;
 446                 }
 447                 // if this completed a packet, transmit it now!
 448                 if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
 449                 transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
 450                 SREG = intr_state;
 451         }
 452         return 0;
 453 }
 454
 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()
 460 {
 461         uint8_t intr_state;
 462
 463         intr_state = SREG;
 464         cli();
 465         if (transmit_flush_timer) {
 466                 UENUM = CDC_TX_ENDPOINT;
 467                 UEINTX = 0x3A;
 468                 transmit_flush_timer = 0;
 469         }
 470         SREG = intr_state;
 471 }
 472
 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
 477 // communication
 478 uint32_t usb_serial_get_baud()
 479 {
 480         uint32_t *baud = (uint32_t*)cdc_line_coding;
 481         return *baud;
 482 }
 483 uint8_t usb_serial_get_stopbits()
 484 {
 485         return cdc_line_coding[4];
 486 }
 487 uint8_t usb_serial_get_paritytype()
 488 {
 489         return cdc_line_coding[5];
 490 }
 491 uint8_t usb_serial_get_numbits()
 492 {
 493         return cdc_line_coding[6];
 494 }
 495 uint8_t usb_serial_get_control()
 496 {
 497         return cdc_line_rtsdtr;
 498 }
 499
 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 )
 507 {
 508         uint8_t intr_state;
 509
 510         intr_state = SREG;
 511         cli();
 512         if (!usb_configuration) {
 513                 // we're not enumerated/configured
 514                 SREG = intr_state;
 515                 return -1;
 516         }
 517
 518         UENUM = CDC_ACM_ENDPOINT;
 519         if (!(UEINTX & (1<<RWAL))) {
 520                 // unable to write
 521                 // TODO; should this try to abort the previously
 522                 // buffered message??
 523                 SREG = intr_state;
 524                 return -1;
 525         }
 526         UEDATX = 0xA1;
 527         UEDATX = 0x20;
 528         UEDATX = 0;
 529         UEDATX = 0;
 530         UEDATX = 0; // 0 seems to work nicely.  what if this is 1??
 531         UEDATX = 0;
 532         UEDATX = 1;
 533         UEDATX = 0;
 534         UEDATX = signals;
 535         UEINTX = 0x3A;
 536         SREG = intr_state;
 537         return 0;
 538 }
 539
 540
 541
 542 // ----- General USB Functions -----
 543
 544 // Set the avr into firmware reload mode
 545 void usb_device_reload()
 546 {
 547         cli();
 548         // Disable watchdog, if enabled
 549         // Disable all peripherals
 550
 551         UDCON = 1;
 552         USBCON = (1 << FRZCLK);  // Disable USB
 553         UCSR1B = 0;
 554         _delay_ms( 5 );
 555
 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");
 580 #endif
 581 }
 582
 583
 584 // WDT Setup for software reset the chip
 585 void wdt_init()
 586 {
 587         MCUSR = 0;
 588         wdt_disable();
 589 }
 590
 591
 592 // initialize USB
 593 uint8_t usb_init()
 594 {
 595         // Check to see if a usb cable has been plugged in
 596         // XXX Not tested (also, not currently needed) -HaaTa
 597         //if ( USB0_STAT & (1 << 1)
 598         //      return 0;
 599
 600         HW_CONFIG();
 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);
 608         sei();
 609
 610         // Disable watchdog timer after possible software reset
 611         //wdt_init(); // XXX Not working...seems to be ok without this, not sure though
 612
 613         return 1;
 614 }
 615
 616 // return 0 if the USB is not configured, or the configuration
 617 // number selected by the HOST
 618 uint8_t usb_configured()
 619 {
 620         return usb_configuration;
 621 }
 622
 623 // USB Device Interrupt - handle all device-level events
 624 // the transmit buffer flushing is triggered by the start of frame
 625 //
 626 ISR( USB_GEN_vect )
 627 {
 628         uint8_t intbits, t_cdc;
 629
 630         intbits = UDINT;
 631         UDINT = 0;
 632         if ( intbits & (1 << EORSTI) )
 633         {
 634                 UENUM = 0;
 635                 UECONX = 1;
 636                 UECFG0X = EP_TYPE_CONTROL;
 637                 UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
 638                 UEIENX = (1 << RXSTPE);
 639                 usb_configuration = 0;
 640                 cdc_line_rtsdtr = 0;
 641         }
 642         if ( (intbits & (1 << SOFI)) && usb_configuration )
 643         {
 644                 t_cdc = transmit_flush_timer;
 645                 if ( t_cdc )
 646                 {
 647                         transmit_flush_timer = --t_cdc;
 648                         if ( !t_cdc )
 649                         {
 650                                 UENUM = CDC_TX_ENDPOINT;
 651                                 UEINTX = 0x3A;
 652                         }
 653                 }
 654                 static uint8_t div4 = 0;
 655                 if ( USBKeys_Idle_Config && (++div4 & 3) == 0 )
 656                 {
 657                         USBKeys_Idle_Count++;
 658                         if ( USBKeys_Idle_Count == USBKeys_Idle_Config )
 659                         {
 660                                 // XXX TODO Is this even used? If so, when? -Jacob
 661                                 // From hasu's code, this section looks like it could fix the Mac SET_IDLE problem
 662                                 // Send normal keyboard interrupt packet(s)
 663                                 switch ( USBKeys_Protocol )
 664                                 {
 665                                 // Send boot keyboard interrupt packet(s)
 666                                 case 0: usb_keyboard_toHost();     break;
 667                                 // Send NKRO keyboard interrupts packet(s)
 668                                 //case 1: usb_nkrokeyboard_toHost(); break; // XXX Not valid anymore
 669                                 }
 670                                 print("IDLE");
 671                         }
 672                 }
 673         }
 674 }
 675
 676
 677
 678 // Misc functions to wait for ready and send/receive packets
 679 static inline void usb_wait_in_ready()
 680 {
 681         while (!(UEINTX & (1<<TXINI))) ;
 682 }
 683 static inline void usb_send_in()
 684 {
 685         UEINTX = ~(1<<TXINI);
 686 }
 687 static inline void usb_wait_receive_out()
 688 {
 689         while (!(UEINTX & (1<<RXOUTI))) ;
 690 }
 691 static inline void usb_ack_out()
 692 {
 693         UEINTX = ~(1<<RXOUTI);
 694 }
 695
 696
 697
 698 // USB Endpoint Interrupt - endpoint 0 is handled here.  The
 699 // other endpoints are manipulated by the user-callable
 700 // functions, and the start-of-frame interrupt.
 701 //
 702 ISR( USB_COM_vect )
 703 {
 704         uint8_t intbits;
 705         const uint8_t *list;
 706         const uint8_t *cfg;
 707         uint8_t i, n, len, en;
 708         uint8_t *p;
 709         uint8_t bmRequestType;
 710         uint8_t bRequest;
 711         uint16_t wValue;
 712         uint16_t wIndex;
 713         uint16_t wLength;
 714         uint16_t desc_val;
 715         const uint8_t *desc_addr;
 716         uint8_t desc_length;
 717
 718         UENUM = 0;
 719         intbits = UEINTX;
 720         if (intbits & (1<<RXSTPI))
 721         {
 722                 bmRequestType = UEDATX;
 723                 bRequest = UEDATX;
 724                 wValue = UEDATX;
 725                 wValue |= (UEDATX << 8);
 726                 wIndex = UEDATX;
 727                 wIndex |= (UEDATX << 8);
 728                 wLength = UEDATX;
 729                 wLength |= (UEDATX << 8);
 730                 UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
 731
 732                 if ( bRequest == GET_DESCRIPTOR )
 733                 {
 734                         list = (const uint8_t *)descriptor_list;
 735                         for ( i = 0; ; i++ )
 736                         {
 737                                 if ( i >= NUM_DESC_LIST )
 738                                 {
 739                                         UECONX = (1 << STALLRQ) | (1 << EPEN);  //stall
 740                                         return;
 741                                 }
 742                                 desc_val = pgm_read_word(list);
 743                                 if ( desc_val != wValue )
 744                                 {
 745                                         list += sizeof( struct descriptor_list_struct );
 746                                         continue;
 747                                 }
 748                                 list += 2;
 749                                 desc_val = pgm_read_word(list);
 750                                 if ( desc_val != wIndex )
 751                                 {
 752                                         list += sizeof(struct descriptor_list_struct) - 2;
 753                                         continue;
 754                                 }
 755                                 list += 2;
 756                                 desc_addr = (const uint8_t *)pgm_read_word(list);
 757                                 list += 2;
 758                                 desc_length = pgm_read_byte(list);
 759                                 break;
 760                         }
 761                         len = (wLength < 256) ? wLength : 255;
 762                         if (len > desc_length) len = desc_length;
 763                         do {
 764                                 // wait for host ready for IN packet
 765                                 do {
 766                                         i = UEINTX;
 767                                 } while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
 768                                 if (i & (1<<RXOUTI)) return;    // abort
 769                                 // send IN packet
 770                                 n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
 771                                 for (i = n; i; i--) {
 772                                         UEDATX = pgm_read_byte(desc_addr++);
 773                                 }
 774                                 len -= n;
 775                                 usb_send_in();
 776                         } while (len || n == ENDPOINT0_SIZE);
 777                         return;
 778                 }
 779
 780                 if (bRequest == SET_ADDRESS) {
 781                         usb_send_in();
 782                         usb_wait_in_ready();
 783                         UDADDR = wValue | (1<<ADDEN);
 784                         return;
 785                 }
 786
 787                 if ( bRequest == SET_CONFIGURATION && bmRequestType == 0 )
 788                 {
 789                         usb_configuration = wValue;
 790                         cdc_line_rtsdtr = 0;
 791                         transmit_flush_timer = 0;
 792                         usb_send_in();
 793                         cfg = endpoint_config_table;
 794                         // Setup each of the 6 additional endpoints (0th already configured)
 795                         for ( i = 1; i < 6; i++ )
 796                         {
 797                                 UENUM = i;
 798                                 en = pgm_read_byte(cfg++);
 799                                 UECONX = en;
 800                                 if (en)
 801                                 {
 802                                         UECFG0X = pgm_read_byte(cfg++);
 803                                         UECFG1X = pgm_read_byte(cfg++);
 804                                 }
 805                         }
 806                         UERST = 0x7E;
 807                         UERST = 0;
 808                         return;
 809                 }
 810
 811                 if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
 812                         usb_wait_in_ready();
 813                         UEDATX = usb_configuration;
 814                         usb_send_in();
 815                         return;
 816                 }
 817
 818                 if ( ( wIndex == KEYBOARD_INTERFACE      && USBKeys_Protocol == 0 )
 819                   || ( wIndex == KEYBOARD_NKRO_INTERFACE && USBKeys_Protocol == 1 ) )
 820                 {
 821                         if ( bmRequestType == 0xA1)
 822                         {
 823                                 if ( bRequest == HID_GET_REPORT )
 824                                 {
 825                                         usb_wait_in_ready();
 826
 827                                         // Send normal keyboard interrupt packet(s)
 828                                         switch ( USBKeys_Protocol )
 829                                         {
 830                                         // Send boot keyboard interrupt packet(s)
 831                                         case 0: usb_keyboard_toHost();     break;
 832                                         // Send NKRO keyboard interrupts packet(s)
 833                                         //case 1: usb_nkrokeyboard_toHost(); break; // XXX Not valid anymore
 834                                         }
 835
 836                                         usb_send_in();
 837                                         return;
 838                                 }
 839                                 if ( bRequest == HID_GET_IDLE )
 840                                 {
 841                                         usb_wait_in_ready();
 842                                         UEDATX = USBKeys_Idle_Config;
 843                                         usb_send_in();
 844                                         return;
 845                                 }
 846                                 if ( bRequest == HID_GET_PROTOCOL )
 847                                 {
 848                                         usb_wait_in_ready();
 849                                         UEDATX = USBKeys_Protocol;
 850                                         usb_send_in();
 851                                         return;
 852                                 }
 853                         }
 854                         if ( bmRequestType == 0x21 )
 855                         {
 856                                 if ( bRequest == HID_SET_REPORT )
 857                                 {
 858                                         usb_wait_receive_out();
 859                                         USBKeys_LEDs = UEDATX;
 860                                         usb_ack_out();
 861                                         usb_send_in();
 862                                         return;
 863                                 }
 864                                 if ( bRequest == HID_SET_IDLE )
 865                                 {
 866                                         usb_wait_in_ready();
 867                                         USBKeys_Idle_Config = (wValue >> 8);
 868                                         USBKeys_Idle_Count = 0;
 869                                         usb_send_in();
 870                                         //print("HID IDLE");
 871                                         return;
 872                                 }
 873                                 if ( bRequest == HID_SET_PROTOCOL )
 874                                 {
 875                                         usb_wait_in_ready();
 876                                         USBKeys_Protocol = wValue; // 0 - Boot Mode, 1 - NKRO Mode
 877                                         usb_send_in();
 878                                         //print("HID SET");
 879                                         return;
 880                                 }
 881                         }
 882                 }
 883
 884                 if (bRequest == CDC_GET_LINE_CODING && bmRequestType == 0xA1) {
 885                         usb_wait_in_ready();
 886                         p = cdc_line_coding;
 887                         for (i=0; i<7; i++) {
 888                                 UEDATX = *p++;
 889                         }
 890                         usb_send_in();
 891                         return;
 892                 }
 893
 894                 if (bRequest == CDC_SET_LINE_CODING && bmRequestType == 0x21) {
 895                         usb_wait_receive_out();
 896                         p = cdc_line_coding;
 897                         for (i=0; i<7; i++) {
 898                                 *p++ = UEDATX;
 899                         }
 900                         usb_ack_out();
 901                         usb_send_in();
 902                         return;
 903                 }
 904
 905                 if (bRequest == CDC_SET_CONTROL_LINE_STATE && bmRequestType == 0x21) {
 906                         cdc_line_rtsdtr = wValue;
 907                         usb_wait_in_ready();
 908                         usb_send_in();
 909                         return;
 910                 }
 911
 912                 if (bRequest == GET_STATUS) {
 913                         usb_wait_in_ready();
 914                         i = 0;
 915                         if (bmRequestType == 0x82) {
 916                                 UENUM = wIndex;
 917                                 if (UECONX & (1<<STALLRQ)) i = 1;
 918                                 UENUM = 0;
 919                         }
 920                         UEDATX = i;
 921                         UEDATX = 0;
 922                         usb_send_in();
 923                         return;
 924                 }
 925
 926                 if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
 927                   && bmRequestType == 0x02 && wValue == 0) {
 928                         i = wIndex & 0x7F;
 929                         if (i >= 1 && i <= MAX_ENDPOINT) {
 930                                 usb_send_in();
 931                                 UENUM = i;
 932                                 if (bRequest == SET_FEATURE) {
 933                                         UECONX = (1<<STALLRQ)|(1<<EPEN);
 934                                 } else {
 935                                         UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
 936                                         UERST = (1 << i);
 937                                         UERST = 0;
 938                                 }
 939                                 return;
 940                         }
 941                 }
 942         }
 943         UECONX = (1 << STALLRQ) | (1 << EPEN);  // stall
 944 }
 945