1 /* Teensyduino Core Library
2 * http://www.pjrc.com/teensy/
3 * Copyright (c) 2013 PJRC.COM, LLC.
4 * Modifications by Jacob Alexander (2013-2014)
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * 1. The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
17 * 2. If the Software is incorporated into a build system that allows
18 * selection among a list of target devices, then similar target
19 * devices manufactured by PJRC.COM must be included in the list of
20 * target devices and selectable in the same manner.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
26 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
27 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
28 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 // ----- Includes -----
35 #include <Lib/OutputLib.h>
44 // ----- Defines -----
47 // XXX - Only use when using usbMuxUart Module
48 // Delay causes issues initializing more than 1 hid device (i.e. NKRO keyboard)
49 //#define UART_DEBUG 1
50 // Debug Unknown USB requests, usually what you want to debug USB issues
51 //#define UART_DEBUG_UNKNOWN 1
54 #define TX_STATE_BOTH_FREE_EVEN_FIRST 0
55 #define TX_STATE_BOTH_FREE_ODD_FIRST 1
56 #define TX_STATE_EVEN_FREE 2
57 #define TX_STATE_ODD_FREE 3
58 #define TX_STATE_NONE_FREE_EVEN_FIRST 4
59 #define TX_STATE_NONE_FREE_ODD_FIRST 5
62 #define BDT_DATA1 0x40
63 #define BDT_DATA0 0x00
65 #define BDT_STALL 0x04
76 #define CLEAR_FEATURE 1
79 #define GET_DESCRIPTOR 6
80 #define SET_DESCRIPTOR 7
81 #define GET_CONFIGURATION 8
82 #define SET_CONFIGURATION 9
83 #define GET_INTERFACE 10
84 #define SET_INTERFACE 11
85 #define SYNCH_FRAME 12
87 #define TX_STATE_BOTH_FREE_EVEN_FIRST 0
88 #define TX_STATE_BOTH_FREE_ODD_FIRST 1
89 #define TX_STATE_EVEN_FREE 2
90 #define TX_STATE_ODD_FREE 3
91 #define TX_STATE_NONE_FREE 4
99 #define BDT_PID(n) (((n) >> 2) & 15)
101 #define BDT_DESC(count, data) (BDT_OWN | BDT_DTS \
102 | ((data) ? BDT_DATA1 : BDT_DATA0) \
105 #define index(endpoint, tx, odd) (((endpoint) << 2) | ((tx) << 1) | (odd))
106 #define stat2bufferdescriptor(stat) (table + ((stat) >> 2))
110 // ----- Structs -----
112 // buffer descriptor table
123 uint8_t bmRequestType;
126 uint16_t wRequestAndType;
140 // ----- Variables -----
142 __attribute__ ((section(".usbdescriptortable"), used))
143 static bdt_t table[ (NUM_ENDPOINTS + 1) * 4 ];
145 static usb_packet_t *rx_first [ NUM_ENDPOINTS ];
146 static usb_packet_t *rx_last [ NUM_ENDPOINTS ];
147 static usb_packet_t *tx_first [ NUM_ENDPOINTS ];
148 static usb_packet_t *tx_last [ NUM_ENDPOINTS ];
149 uint16_t usb_rx_byte_count_data[ NUM_ENDPOINTS ];
151 static uint8_t tx_state[NUM_ENDPOINTS];
153 // SETUP always uses a DATA0 PID for the data field of the SETUP transaction.
154 // transactions in the data phase start with DATA1 and toggle (figure 8-12, USB1.1)
155 // Status stage uses a DATA1 PID.
157 static uint8_t ep0_rx0_buf[EP0_SIZE] __attribute__ ((aligned (4)));
158 static uint8_t ep0_rx1_buf[EP0_SIZE] __attribute__ ((aligned (4)));
159 static const uint8_t *ep0_tx_ptr = NULL;
160 static uint16_t ep0_tx_len;
161 static uint8_t ep0_tx_bdt_bank = 0;
162 static uint8_t ep0_tx_data_toggle = 0;
163 uint8_t usb_rx_memory_needed = 0;
165 volatile uint8_t usb_configuration = 0;
166 volatile uint8_t usb_reboot_timer = 0;
168 static uint8_t reply_buffer[8];
170 volatile uint8_t remote_wakeup_enabled = 0;
173 // ----- Functions -----
175 static void endpoint0_stall()
177 USB0_ENDPT0 = USB_ENDPT_EPSTALL | USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
180 static void endpoint0_transmit( const void *data, uint32_t len )
182 table[index(0, TX, ep0_tx_bdt_bank)].addr = (void *)data;
183 table[index(0, TX, ep0_tx_bdt_bank)].desc = BDT_DESC(len, ep0_tx_data_toggle);
184 ep0_tx_data_toggle ^= 1;
185 ep0_tx_bdt_bank ^= 1;
188 static void usb_setup()
190 const uint8_t *data = NULL;
191 uint32_t datalen = 0;
192 const usb_descriptor_list_t *list;
194 volatile uint8_t *reg;
199 switch ( setup.wRequestAndType )
201 case 0x0500: // SET_ADDRESS
203 case 0x0900: // SET_CONFIGURATION
205 print("CONFIGURE - ");
207 usb_configuration = setup.wValue;
209 cfg = usb_endpoint_config_table;
210 // clear all BDT entries, free any allocated memory...
211 for ( i = 4; i < ( NUM_ENDPOINTS + 1) * 4; i++ )
213 if ( table[i].desc & BDT_OWN )
215 usb_free( (usb_packet_t *)((uint8_t *)(table[ i ].addr) - 8) );
218 // free all queued packets
219 for ( i = 0; i < NUM_ENDPOINTS; i++ )
229 rx_first[ i ] = NULL;
238 tx_first[ i ] = NULL;
240 usb_rx_byte_count_data[i] = 0;
242 switch ( tx_state[ i ] )
244 case TX_STATE_EVEN_FREE:
245 case TX_STATE_NONE_FREE_EVEN_FIRST:
246 tx_state[ i ] = TX_STATE_BOTH_FREE_EVEN_FIRST;
248 case TX_STATE_ODD_FREE:
249 case TX_STATE_NONE_FREE_ODD_FIRST:
250 tx_state[ i ] = TX_STATE_BOTH_FREE_ODD_FIRST;
256 usb_rx_memory_needed = 0;
257 for ( i = 1; i <= NUM_ENDPOINTS; i++ )
262 if ( epconf & USB_ENDPT_EPRXEN )
268 table[ index( i, RX, EVEN ) ].addr = p->buf;
269 table[ index( i, RX, EVEN ) ].desc = BDT_DESC( 64, 0 );
273 table[ index( i, RX, EVEN ) ].desc = 0;
274 usb_rx_memory_needed++;
279 table[ index( i, RX, ODD ) ].addr = p->buf;
280 table[ index( i, RX, ODD ) ].desc = BDT_DESC( 64, 1 );
284 table[ index( i, RX, ODD ) ].desc = 0;
285 usb_rx_memory_needed++;
288 table[ index( i, TX, EVEN ) ].desc = 0;
289 table[ index( i, TX, ODD ) ].desc = 0;
292 case 0x0880: // GET_CONFIGURATION
293 reply_buffer[0] = usb_configuration;
297 case 0x0080: // GET_STATUS (device)
298 //I think this is the corrent endianess
299 reply_buffer[0] = (remote_wakeup_enabled)<<1;
304 case 0x0082: // GET_STATUS (endpoint)
305 if ( setup.wIndex > NUM_ENDPOINTS )
307 // TODO: do we need to handle IN vs OUT here?
313 if ( *(uint8_t *)(&USB0_ENDPT0 + setup.wIndex * 4) & 0x02 )
318 case 0x0100: // CLEAR_FEATURE (device)
319 //Disable DEVICE_REMOTE_WAKEUP feature
320 if (setup.wValue == 0x01) {
321 remote_wakeup_enabled = 0;
324 case 0x0101: // CLEAR_FEATURE (interface)
325 // TODO: Currently ignoring, perhaps useful? -HaaTa
328 case 0x0102: // CLEAR_FEATURE (interface)
329 i = setup.wIndex & 0x7F;
330 if ( i > NUM_ENDPOINTS || setup.wValue != 0 )
335 //(*(uint8_t *)(&USB0_ENDPT0 + setup.wIndex * 4)) &= ~0x02;
336 // TODO: do we need to clear the data toggle here?
339 // FIXME: Clearing causes keyboard to freeze, likely an invalid clear
340 // XXX: Ignoring seems to work, though this may not be the ideal behaviour -HaaTa
343 case 0x0300: // SET_FEATURE (device)
344 //Enable DEVICE_REMOTE_WAKEUP feature
345 if (setup.wValue == 0x01) {
346 remote_wakeup_enabled = 1;
349 case 0x0301: // SET_FEATURE (interface)
350 // TODO: Currently ignoring, perhaps useful? -HaaTa
353 case 0x0302: // SET_FEATURE (endpoint)
354 i = setup.wIndex & 0x7F;
355 if ( i > NUM_ENDPOINTS || setup.wValue != 0 )
357 // TODO: do we need to handle IN vs OUT here?
361 (*(uint8_t *)(&USB0_ENDPT0 + setup.wIndex * 4)) |= 0x02;
362 // TODO: do we need to clear the data toggle here?
364 case 0x0680: // GET_DESCRIPTOR
368 printHex( setup.wValue );
371 for ( list = usb_descriptor_list; 1; list++ )
373 if ( list->addr == NULL )
375 if ( setup.wValue == list->wValue && setup.wIndex == list->wIndex )
378 if ( (setup.wValue >> 8) == 3 )
380 // for string descriptors, use the descriptor's
381 // length field, allowing runtime configured
383 datalen = *(list->addr);
387 datalen = list->length;
390 print("Desc found, ");
391 printHex32( (uint32_t)data );
395 printHex_op( data[0], 2 );
396 printHex_op( data[1], 2 );
397 printHex_op( data[2], 2 );
398 printHex_op( data[3], 2 );
399 printHex_op( data[4], 2 );
400 printHex_op( data[5], 2 );
407 print( "desc: not found" NL );
412 case 0x2221: // CDC_SET_CONTROL_LINE_STATE
413 usb_cdc_line_rtsdtr = setup.wValue;
414 //serial_print("set control line state\n");
418 case 0x21A1: // CDC_GET_LINE_CODING
419 data = (uint8_t*)usb_cdc_line_coding;
420 datalen = sizeof( usb_cdc_line_coding );
423 case 0x2021: // CDC_SET_LINE_CODING
425 //serial_print("set coding, waiting...\n");
427 return; // Cannot stall here (causes issues)
429 case 0x0921: // HID SET_REPORT
431 print("SET_REPORT - ");
432 printHex( setup.wValue );
434 printHex( setup.wValue & 0xFF );
437 USBKeys_LEDs = setup.wValue & 0xFF;
441 case 0x01A1: // HID GET_REPORT
443 print("GET_REPORT - ");
444 printHex( USBKeys_LEDs );
447 data = (uint8_t*)&USBKeys_LEDs;
451 case 0x0A21: // HID SET_IDLE
453 print("SET_IDLE - ");
454 printHex( setup.wValue );
457 USBKeys_Idle_Config = (setup.wValue >> 8);
458 USBKeys_Idle_Count = 0;
462 case 0x0B21: // HID SET_PROTOCOL
464 print("SET_PROTOCOL - ");
465 printHex( setup.wValue );
467 printHex( setup.wValue & 0xFF );
470 USBKeys_Protocol = setup.wValue & 0xFF; // 0 - Boot Mode, 1 - NKRO Mode
476 #ifdef UART_DEBUG_UNKNOWN
485 print("setup send ");
486 printHex32((uint32_t)data);
492 if ( datalen > setup.wLength )
493 datalen = setup.wLength;
496 if ( size > EP0_SIZE )
499 endpoint0_transmit(data, size);
503 // See if transmit has finished
504 if ( datalen == 0 && size < EP0_SIZE )
508 if ( size > EP0_SIZE )
510 endpoint0_transmit(data, size);
514 // See if transmit has finished
515 if ( datalen == 0 && size < EP0_SIZE )
518 // Save rest of transfer for later? XXX
520 ep0_tx_len = datalen;
524 //A bulk endpoint's toggle sequence is initialized to DATA0 when the endpoint
525 //experiences any configuration event (configuration events are explained in
526 //Sections 9.1.1.5 and 9.4.5).
528 //Configuring a device or changing an alternate setting causes all of the status
529 //and configuration values associated with endpoints in the affected interfaces
530 //to be set to their default values. This includes setting the data toggle of
531 //any endpoint using data toggles to the value DATA0.
533 //For endpoints using data toggle, regardless of whether an endpoint has the
534 //Halt feature set, a ClearFeature(ENDPOINT_HALT) request always results in the
535 //data toggle being reinitialized to DATA0.
537 static void usb_control( uint32_t stat )
547 b = stat2bufferdescriptor( stat );
548 pid = BDT_PID( b->desc );
560 case 0x0D: // Setup received from host
561 //serial_print("PID=Setup\n");
562 //if (count != 8) ; // panic?
563 // grab the 8 byte setup info
564 setup.word1 = *(uint32_t *)(buf);
565 setup.word2 = *(uint32_t *)(buf + 4);
567 // give the buffer back
568 b->desc = BDT_DESC( EP0_SIZE, DATA1 );
569 //table[index(0, RX, EVEN)].desc = BDT_DESC(EP0_SIZE, 1);
570 //table[index(0, RX, ODD)].desc = BDT_DESC(EP0_SIZE, 1);
572 // clear any leftover pending IN transactions
574 if ( ep0_tx_data_toggle )
577 //if (table[index(0, TX, EVEN)].desc & 0x80) {
578 //serial_print("leftover tx even\n");
580 //if (table[index(0, TX, ODD)].desc & 0x80) {
581 //serial_print("leftover tx odd\n");
583 table[index(0, TX, EVEN)].desc = 0;
584 table[index(0, TX, ODD)].desc = 0;
585 // first IN after Setup is always DATA1
586 ep0_tx_data_toggle = 1;
588 #ifdef UART_DEBUG_UNKNOWN
589 print("bmRequestType:");
590 printHex(setup.bmRequestType);
591 print(", bRequest:");
592 printHex(setup.bRequest);
594 printHex(setup.wValue);
596 printHex(setup.wIndex);
598 printHex(setup.wLength);
601 // actually "do" the setup request
603 // unfreeze the USB, now that we're ready
604 USB0_CTL = USB_CTL_USBENSOFEN; // clear TXSUSPENDTOKENBUSY bit
606 case 0x01: // OUT transaction received from host
612 if ( setup.wRequestAndType == 0x2021 /*CDC_SET_LINE_CODING*/ )
615 uint8_t *dst = (uint8_t *)usb_cdc_line_coding;
616 //serial_print("set line coding ");
617 for ( i = 0; i < 7; i++ )
622 //serial_phex32(usb_cdc_line_coding[0]);
623 //serial_print("\n");
624 if ( usb_cdc_line_coding[0] == 134 )
625 usb_reboot_timer = 15;
626 endpoint0_transmit( NULL, 0 );
629 // Keyboard Interface
630 if ( setup.word1 == 0x02000921 && setup.word2 == ( (1<<16) | KEYBOARD_INTERFACE ) )
632 USBKeys_LEDs = buf[0];
633 endpoint0_transmit( NULL, 0 );
635 // NKRO Keyboard Interface
636 if ( setup.word1 == 0x02000921 && setup.word2 == ( (1<<16) | NKRO_KEYBOARD_INTERFACE ) )
638 USBKeys_LEDs = buf[0];
639 endpoint0_transmit( NULL, 0 );
642 // give the buffer back
643 b->desc = BDT_DESC( EP0_SIZE, DATA1 );
646 case 0x09: // IN transaction completed to host
653 // send remaining data, if any...
658 if (size > EP0_SIZE) size = EP0_SIZE;
659 endpoint0_transmit(data, size);
662 ep0_tx_ptr = (ep0_tx_len > 0 || size == EP0_SIZE) ? data : NULL;
665 if ( setup.bRequest == 5 && setup.bmRequestType == 0 )
669 print("set address: ");
670 printHex(setup.wValue);
673 USB0_ADDR = setup.wValue;
679 print("PID=unknown:");
685 USB0_CTL = USB_CTL_USBENSOFEN; // clear TXSUSPENDTOKENBUSY bit
688 usb_packet_t *usb_rx( uint32_t endpoint )
693 if ( endpoint >= NUM_ENDPOINTS )
696 ret = rx_first[endpoint];
698 rx_first[ endpoint ] = ret->next;
699 usb_rx_byte_count_data[ endpoint ] -= ret->len;
701 //serial_print("rx, epidx=");
702 //serial_phex(endpoint);
703 //serial_print(", packet=");
704 //serial_phex32(ret);
705 //serial_print("\n");
709 static uint32_t usb_queue_byte_count( const usb_packet_t *p )
714 for ( ; p; p = p->next )
722 uint32_t usb_tx_byte_count( uint32_t endpoint )
725 if ( endpoint >= NUM_ENDPOINTS )
727 return usb_queue_byte_count( tx_first[ endpoint ] );
730 uint32_t usb_tx_packet_count( uint32_t endpoint )
732 const usb_packet_t *p;
736 if ( endpoint >= NUM_ENDPOINTS )
739 for ( p = tx_first[ endpoint ]; p; p = p->next )
746 // Called from usb_free, but only when usb_rx_memory_needed > 0, indicating
747 // receive endpoints are starving for memory. The intention is to give
748 // endpoints needing receive memory priority over the user's code, which is
749 // likely calling usb_malloc to obtain memory for transmitting. When the
750 // user is creating data very quickly, their consumption could starve reception
751 // without this prioritization. The packet buffer (input) is assigned to the
752 // first endpoint needing memory.
754 void usb_rx_memory( usb_packet_t *packet )
756 //print("USB RX MEMORY");
760 cfg = usb_endpoint_config_table;
761 //serial_print("rx_mem:");
763 for ( i = 1; i <= NUM_ENDPOINTS; i++ )
765 if ( *cfg++ & USB_ENDPT_EPRXEN )
767 if ( table[ index( i, RX, EVEN ) ].desc == 0 )
769 table[ index( i, RX, EVEN ) ].addr = packet->buf;
770 table[ index( i, RX, EVEN ) ].desc = BDT_DESC( 64, 0 );
771 usb_rx_memory_needed--;
774 //serial_print(",even\n");
777 if ( table[ index( i, RX, ODD ) ].desc == 0 )
779 table[ index( i, RX, ODD ) ].addr = packet->buf;
780 table[ index( i, RX, ODD ) ].desc = BDT_DESC( 64, 1 );
781 usb_rx_memory_needed--;
784 //serial_print(",odd\n");
790 // we should never reach this point. If we get here, it means
791 // usb_rx_memory_needed was set greater than zero, but no memory
792 // was actually needed.
793 usb_rx_memory_needed = 0;
798 //#define index(endpoint, tx, odd) (((endpoint) << 2) | ((tx) << 1) | (odd))
799 //#define stat2bufferdescriptor(stat) (table + ((stat) >> 2))
801 void usb_tx( uint32_t endpoint, usb_packet_t *packet )
803 bdt_t *b = &table[ index( endpoint, TX, EVEN ) ];
807 if ( endpoint >= NUM_ENDPOINTS )
810 //serial_print("txstate=");
811 //serial_phex(tx_state[ endpoint ]);
812 //serial_print("\n");
813 switch ( tx_state[ endpoint ] )
815 case TX_STATE_BOTH_FREE_EVEN_FIRST:
816 next = TX_STATE_ODD_FREE;
818 case TX_STATE_BOTH_FREE_ODD_FIRST:
820 next = TX_STATE_EVEN_FREE;
822 case TX_STATE_EVEN_FREE:
823 next = TX_STATE_NONE_FREE_ODD_FIRST;
825 case TX_STATE_ODD_FREE:
827 next = TX_STATE_NONE_FREE_EVEN_FIRST;
830 if (tx_first[ endpoint ] == NULL)
832 tx_first[ endpoint ] = packet;
836 tx_last[ endpoint ]->next = packet;
838 tx_last[ endpoint ] = packet;
843 tx_state[ endpoint ] = next;
844 b->addr = packet->buf;
845 b->desc = BDT_DESC( packet->len, ((uint32_t)b & 8) ? DATA1 : DATA0 );
850 void usb_device_reload()
853 #if defined(_mk20dx128vlf5_)
855 // MCHCK Kiibohd Variant
856 // Check to see if PTA3 (has a pull-up) is connected to GND (usually via jumper)
857 // Only allow reload if the jumper is present (security)
858 GPIOA_PDDR &= ~(1<<3); // Input
859 PORTA_PCR3 = PORT_PCR_PFE | PORT_PCR_MUX(1); // Internal pull-up
862 if ( GPIOA_PDIR & (1<<3) )
865 warn_print("Security jumper not present, cancelling firmware reload...");
866 info_msg("Replace jumper on middle 2 pins, or manually press the firmware reload button.");
870 // Copies variable into the VBAT register, must be identical to the variable in the bootloader to jump to the bootloader flash mode
871 for ( int pos = 0; pos < sizeof(sys_reset_to_loader_magic); pos++ )
872 (&VBAT)[ pos ] = sys_reset_to_loader_magic[ pos ];
876 // Teensy 3.0 and 3.1
878 asm volatile("bkpt");
885 uint8_t status, stat, t;
887 //serial_print("isr");
888 //status = USB0_ISTAT;
889 //serial_phex(status);
890 //serial_print("\n");
894 print("USB ISR STATUS: ");
899 if ( (status & USB_INTEN_SOFTOKEN /* 04 */ ) )
901 if ( usb_configuration )
903 t = usb_reboot_timer;
906 usb_reboot_timer = --t;
912 t = usb_cdc_transmit_flush_timer;
915 usb_cdc_transmit_flush_timer = --t;
917 usb_serial_flush_callback();
921 USB0_ISTAT = USB_INTEN_SOFTOKEN;
924 if ( (status & USB_ISTAT_TOKDNE /* 08 */ ) )
928 //serial_print("token: ep=");
929 //serial_phex(stat >> 4);
930 //serial_print(stat & 0x08 ? ",tx" : ",rx");
931 //serial_print(stat & 0x04 ? ",odd\n" : ",even\n");
932 endpoint = stat >> 4;
939 bdt_t *b = stat2bufferdescriptor(stat);
940 usb_packet_t *packet = (usb_packet_t *)((uint8_t *)(b->addr) - 8);
943 serial_phex(endpoint);
944 serial_print(", pid:");
945 serial_phex(BDT_PID(b->desc));
946 serial_print(((uint32_t)b & 8) ? ", odd" : ", even");
947 serial_print(", count:");
948 serial_phex(b->desc >> 16);
951 endpoint--; // endpoint is index to zero-based arrays
956 packet = tx_first[ endpoint ];
959 //serial_print("tx packet\n");
960 tx_first[endpoint] = packet->next;
961 b->addr = packet->buf;
962 switch ( tx_state[ endpoint ] )
964 case TX_STATE_BOTH_FREE_EVEN_FIRST:
965 tx_state[ endpoint ] = TX_STATE_ODD_FREE;
967 case TX_STATE_BOTH_FREE_ODD_FIRST:
968 tx_state[ endpoint ] = TX_STATE_EVEN_FREE;
970 case TX_STATE_EVEN_FREE:
971 tx_state[ endpoint ] = TX_STATE_NONE_FREE_ODD_FIRST;
973 case TX_STATE_ODD_FREE:
974 tx_state[ endpoint ] = TX_STATE_NONE_FREE_EVEN_FIRST;
979 b->desc = BDT_DESC( packet->len, ((uint32_t)b & 8) ? DATA1 : DATA0 );
981 //serial_print("tx no packet\n");
982 switch ( tx_state[ endpoint ] )
984 case TX_STATE_BOTH_FREE_EVEN_FIRST:
985 case TX_STATE_BOTH_FREE_ODD_FIRST:
987 case TX_STATE_EVEN_FREE:
988 tx_state[ endpoint ] = TX_STATE_BOTH_FREE_EVEN_FIRST;
990 case TX_STATE_ODD_FREE:
991 tx_state[ endpoint ] = TX_STATE_BOTH_FREE_ODD_FIRST;
994 tx_state[ endpoint ] = ((uint32_t)b & 8)
996 : TX_STATE_EVEN_FREE;
1003 packet->len = b->desc >> 16;
1004 if ( packet->len > 0 )
1007 packet->next = NULL;
1008 if ( rx_first[ endpoint ] == NULL )
1010 //serial_print("rx 1st, epidx=");
1011 //serial_phex(endpoint);
1012 //serial_print(", packet=");
1013 //serial_phex32((uint32_t)packet);
1014 //serial_print("\n");
1015 rx_first[ endpoint ] = packet;
1019 //serial_print("rx Nth, epidx=");
1020 //serial_phex(endpoint);
1021 //serial_print(", packet=");
1022 //serial_phex32((uint32_t)packet);
1023 //serial_print("\n");
1024 rx_last[ endpoint ]->next = packet;
1026 rx_last[ endpoint ] = packet;
1027 usb_rx_byte_count_data[ endpoint ] += packet->len;
1028 // TODO: implement a per-endpoint maximum # of allocated packets
1029 // so a flood of incoming data on 1 endpoint doesn't starve
1030 // the others if the user isn't reading it regularly
1031 packet = usb_malloc();
1034 b->addr = packet->buf;
1035 b->desc = BDT_DESC( 64, ((uint32_t)b & 8) ? DATA1 : DATA0 );
1039 //serial_print("starving ");
1040 //serial_phex(endpoint + 1);
1041 //serial_print(((uint32_t)b & 8) ? ",odd\n" : ",even\n");
1043 usb_rx_memory_needed++;
1048 b->desc = BDT_DESC( 64, ((uint32_t)b & 8) ? DATA1 : DATA0 );
1056 USB0_ISTAT = USB_ISTAT_TOKDNE;
1061 if ( status & USB_ISTAT_USBRST /* 01 */ )
1063 //serial_print("reset\n");
1065 // initialize BDT toggle bits
1066 USB0_CTL = USB_CTL_ODDRST;
1067 ep0_tx_bdt_bank = 0;
1069 // set up buffers to receive Setup and OUT packets
1070 table[index( 0, RX, EVEN ) ].desc = BDT_DESC( EP0_SIZE, 0 );
1071 table[index( 0, RX, EVEN ) ].addr = ep0_rx0_buf;
1072 table[index( 0, RX, ODD ) ].desc = BDT_DESC( EP0_SIZE, 0 );
1073 table[index( 0, RX, ODD ) ].addr = ep0_rx1_buf;
1074 table[index( 0, TX, EVEN ) ].desc = 0;
1075 table[index( 0, TX, ODD ) ].desc = 0;
1077 // activate endpoint 0
1078 USB0_ENDPT0 = USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
1080 // clear all ending interrupts
1081 USB0_ERRSTAT = 0xFF;
1084 // set the address to zero during enumeration
1087 // enable other interrupts
1089 USB0_INTEN = USB_INTEN_TOKDNEEN |
1090 USB_INTEN_SOFTOKEN |
1093 USB_INTEN_USBRSTEN |
1096 // is this necessary?
1097 USB0_CTL = USB_CTL_USBENSOFEN;
1102 if ( (status & USB_ISTAT_STALL /* 80 */ ) )
1104 //serial_print("stall:\n");
1105 USB0_ENDPT0 = USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
1106 USB0_ISTAT = USB_ISTAT_STALL;
1108 if ( (status & USB_ISTAT_ERROR /* 02 */ ) )
1110 uint8_t err = USB0_ERRSTAT;
1112 //serial_print("err:");
1114 //serial_print("\n");
1115 USB0_ISTAT = USB_ISTAT_ERROR;
1118 if ( (status & USB_ISTAT_SLEEP /* 10 */ ) )
1120 //serial_print("sleep\n");
1121 USB0_ISTAT = USB_ISTAT_SLEEP;
1124 if ( (status & USB_ISTAT_RESUME /* 20 */ ) ) {
1125 //serial_print("resume\n");
1126 USB0_ISTAT = USB_ISTAT_RESUME;
1135 print("USB INIT"NL);
1138 // If no USB cable is attached, do not initialize usb
1140 //if ( USB0_OTGISTAT & USB_OTGSTAT_ID )
1143 // Clear out endpoints table
1144 for ( int i = 0; i <= NUM_ENDPOINTS * 4; i++ )
1150 // this basically follows the flowchart in the Kinetis
1151 // Quick Reference User Guide, Rev. 1, 03/2012, page 141
1153 // assume 48 MHz clock already running
1154 // SIM - enable clock
1155 SIM_SCGC4 |= SIM_SCGC4_USBOTG;
1158 USB0_USBTRC0 = USB_USBTRC_USBRESET;
1159 while ( (USB0_USBTRC0 & USB_USBTRC_USBRESET) != 0 ); // wait for reset to end
1161 // set desc table base addr
1162 USB0_BDTPAGE1 = ((uint32_t)table) >> 8;
1163 USB0_BDTPAGE2 = ((uint32_t)table) >> 16;
1164 USB0_BDTPAGE3 = ((uint32_t)table) >> 24;
1166 // clear all ISR flags
1168 USB0_ERRSTAT = 0xFF;
1169 USB0_OTGISTAT = 0xFF;
1171 USB0_USBTRC0 |= 0x40; // undocumented bit
1174 USB0_CTL = USB_CTL_USBENSOFEN;
1177 // enable reset interrupt
1178 USB0_INTEN = USB_INTEN_USBRSTEN;
1180 // enable interrupt in NVIC...
1181 NVIC_SET_PRIORITY( IRQ_USBOTG, 112 );
1182 NVIC_ENABLE_IRQ( IRQ_USBOTG );
1185 USB0_CONTROL = USB_CONTROL_DPPULLUPNONOTG;
1190 // return 0 if the USB is not configured, or the configuration
1191 // number selected by the HOST
1192 uint8_t usb_configured()
1194 return usb_configuration;