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- /* Teensyduino Core Library
- * http://www.pjrc.com/teensy/
- * Copyright (c) 2013 PJRC.COM, LLC.
- * Modifications by Jacob Alexander (2013-2016)
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * 1. The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * 2. If the Software is incorporated into a build system that allows
- * selection among a list of target devices, then similar target
- * devices manufactured by PJRC.COM must be included in the list of
- * target devices and selectable in the same manner.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
- // ----- Includes -----
-
- // Project Includes
- #include <Lib/OutputLib.h>
- #include <print.h>
- #include <kll_defs.h>
-
- // Local Includes
- #include "usb_dev.h"
- #include "usb_mem.h"
-
- #if enableVirtualSerialPort_define == 1
- #include "usb_serial.h"
- #endif
-
-
-
- // ----- Defines -----
-
- // DEBUG Mode
- // XXX - Only use when using usbMuxUart Module
- // Delay causes issues initializing more than 1 hid device (i.e. NKRO keyboard)
- //#define UART_DEBUG 1
- // Debug Unknown USB requests, usually what you want to debug USB issues
- //#define UART_DEBUG_UNKNOWN 1
-
-
- #define TX_STATE_BOTH_FREE_EVEN_FIRST 0
- #define TX_STATE_BOTH_FREE_ODD_FIRST 1
- #define TX_STATE_EVEN_FREE 2
- #define TX_STATE_ODD_FREE 3
- #define TX_STATE_NONE_FREE_EVEN_FIRST 4
- #define TX_STATE_NONE_FREE_ODD_FIRST 5
-
- #define BDT_OWN 0x80
- #define BDT_DATA1 0x40
- #define BDT_DATA0 0x00
- #define BDT_DTS 0x08
- #define BDT_STALL 0x04
-
- #define TX 1
- #define RX 0
- #define ODD 1
- #define EVEN 0
- #define DATA0 0
- #define DATA1 1
-
-
- #define GET_STATUS 0
- #define CLEAR_FEATURE 1
- #define SET_FEATURE 3
- #define SET_ADDRESS 5
- #define GET_DESCRIPTOR 6
- #define SET_DESCRIPTOR 7
- #define GET_CONFIGURATION 8
- #define SET_CONFIGURATION 9
- #define GET_INTERFACE 10
- #define SET_INTERFACE 11
- #define SYNCH_FRAME 12
-
- #define TX_STATE_BOTH_FREE_EVEN_FIRST 0
- #define TX_STATE_BOTH_FREE_ODD_FIRST 1
- #define TX_STATE_EVEN_FREE 2
- #define TX_STATE_ODD_FREE 3
- #define TX_STATE_NONE_FREE 4
-
-
-
-
-
- // ----- Macros -----
-
- #define BDT_PID(n) (((n) >> 2) & 15)
-
- #define BDT_DESC(count, data) (BDT_OWN | BDT_DTS \
- | ((data) ? BDT_DATA1 : BDT_DATA0) \
- | ((count) << 16))
-
- #define index(endpoint, tx, odd) (((endpoint) << 2) | ((tx) << 1) | (odd))
- #define stat2bufferdescriptor(stat) (table + ((stat) >> 2))
-
-
-
- // ----- Structs -----
-
- // buffer descriptor table
-
- typedef struct {
- uint32_t desc;
- void * addr;
- } bdt_t;
-
- static union {
- struct {
- union {
- struct {
- uint8_t bmRequestType;
- uint8_t bRequest;
- };
- uint16_t wRequestAndType;
- };
- uint16_t wValue;
- uint16_t wIndex;
- uint16_t wLength;
- };
- struct {
- uint32_t word1;
- uint32_t word2;
- };
- } setup;
-
-
-
- // ----- Variables -----
-
- __attribute__ ((section(".usbdescriptortable"), used))
- static bdt_t table[ (NUM_ENDPOINTS + 1) * 4 ];
-
- static usb_packet_t *rx_first [ NUM_ENDPOINTS ];
- static usb_packet_t *rx_last [ NUM_ENDPOINTS ];
- static usb_packet_t *tx_first [ NUM_ENDPOINTS ];
- static usb_packet_t *tx_last [ NUM_ENDPOINTS ];
- uint16_t usb_rx_byte_count_data[ NUM_ENDPOINTS ];
-
- static uint8_t tx_state[NUM_ENDPOINTS];
-
- // SETUP always uses a DATA0 PID for the data field of the SETUP transaction.
- // transactions in the data phase start with DATA1 and toggle (figure 8-12, USB1.1)
- // Status stage uses a DATA1 PID.
-
- static uint8_t ep0_rx0_buf[EP0_SIZE] __attribute__ ((aligned (4)));
- static uint8_t ep0_rx1_buf[EP0_SIZE] __attribute__ ((aligned (4)));
- static const uint8_t *ep0_tx_ptr = NULL;
- static uint16_t ep0_tx_len;
- static uint8_t ep0_tx_bdt_bank = 0;
- static uint8_t ep0_tx_data_toggle = 0;
- uint8_t usb_rx_memory_needed = 0;
-
- volatile uint8_t usb_configuration = 0;
- volatile uint8_t usb_reboot_timer = 0;
-
- static uint8_t reply_buffer[8];
-
- static uint8_t power_neg_delay;
- static uint32_t power_neg_time;
-
- static uint8_t usb_dev_sleep = 0;
-
-
-
- // ----- Functions -----
-
- static void endpoint0_stall()
- {
- #ifdef UART_DEBUG_UNKNOWN
- print("STALL : ");
- printInt32( systick_millis_count - USBInit_TimeStart );
- print(" ms");
- print(NL);
- #endif
- USB0_ENDPT0 = USB_ENDPT_EPSTALL | USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
- }
-
- static void endpoint0_transmit( const void *data, uint32_t len )
- {
- table[index(0, TX, ep0_tx_bdt_bank)].addr = (void *)data;
- table[index(0, TX, ep0_tx_bdt_bank)].desc = BDT_DESC(len, ep0_tx_data_toggle);
- ep0_tx_data_toggle ^= 1;
- ep0_tx_bdt_bank ^= 1;
- }
-
- void usb_reinit()
- {
- usb_configuration = 0; // Clear USB configuration if we have one
- USB0_CONTROL = 0; // Disable D+ Pullup to simulate disconnect
- delay(10); // Delay is necessary to simulate disconnect
- usb_init();
- }
-
- // Used to check any USB state changes that may not have a proper interrupt
- // Called once per scan loop, should take minimal processing time or it may affect other modules
- void usb_device_check()
- {
- // Check to see if we're still waiting for the next USB request after Get Configuration Descriptor
- // If still waiting, restart the USB initialization with a lower power requirement
- if ( power_neg_delay )
- {
- // Check if 100 ms has elapsed
- if ( systick_millis_count - power_neg_time > 100 )
- {
- power_neg_delay = 0;
-
- // USB Low Power Negotiation
- #if enableUSBLowPowerNegotiation_define == 1
- // Check to see if bMaxPower has already be lowered
- // This generally points to a USB bug (host or device?)
- if ( *usb_bMaxPower == 50 )
- {
- warn_msg("Power negotiation delay detected again, likely a system/device USB bug");
- return;
- }
-
- // Update bMaxPower
- // The value set is in increments of 2 mA
- // So 50 * 2 mA = 100 mA
- // XXX Currently only transitions to 100 mA
- // It may be possible to transition down again to 20 mA
- *usb_bMaxPower = 50;
-
- // Re-initialize USB
- usb_reinit();
- #else
- warn_msg("USB Low Power Negotation Disabled, condition detected.");
- #endif
- }
- }
- }
-
- static void usb_setup()
- {
- const uint8_t *data = NULL;
- uint32_t datalen = 0;
- const usb_descriptor_list_t *list;
- uint32_t size;
- volatile uint8_t *reg;
- uint8_t epconf;
- const uint8_t *cfg;
- int i;
-
- // Reset USB Init timer
- USBInit_TimeEnd = systick_millis_count;
- USBInit_Ticks++;
-
- // If another request is made, disable the power negotiation check
- // See GET_DESCRIPTOR - Configuration
- if ( power_neg_delay )
- {
- power_neg_delay = 0;
- }
-
- switch ( setup.wRequestAndType )
- {
- case 0x0500: // SET_ADDRESS
- goto send;
-
- case 0x0900: // SET_CONFIGURATION
- #ifdef UART_DEBUG
- print("CONFIGURE - ");
- #endif
- usb_configuration = setup.wValue;
- Output_Available = usb_configuration;
- reg = &USB0_ENDPT1;
- cfg = usb_endpoint_config_table;
-
- // Now configured so we can utilize bMaxPower now
- Output_update_usb_current( *usb_bMaxPower * 2 );
-
- // clear all BDT entries, free any allocated memory...
- for ( i = 4; i < ( NUM_ENDPOINTS + 1) * 4; i++ )
- {
- if ( table[i].desc & BDT_OWN )
- {
- usb_free( (usb_packet_t *)((uint8_t *)(table[ i ].addr) - 8) );
- }
- }
- // free all queued packets
- for ( i = 0; i < NUM_ENDPOINTS; i++ )
- {
- usb_packet_t *p, *n;
- p = rx_first[i];
- while ( p )
- {
- n = p->next;
- usb_free(p);
- p = n;
- }
- rx_first[ i ] = NULL;
- rx_last[ i ] = NULL;
- p = tx_first[i];
- while (p)
- {
- n = p->next;
- usb_free(p);
- p = n;
- }
- tx_first[ i ] = NULL;
- tx_last[ i ] = NULL;
- usb_rx_byte_count_data[i] = 0;
-
- switch ( tx_state[ i ] )
- {
- case TX_STATE_EVEN_FREE:
- case TX_STATE_NONE_FREE_EVEN_FIRST:
- tx_state[ i ] = TX_STATE_BOTH_FREE_EVEN_FIRST;
- break;
- case TX_STATE_ODD_FREE:
- case TX_STATE_NONE_FREE_ODD_FIRST:
- tx_state[ i ] = TX_STATE_BOTH_FREE_ODD_FIRST;
- break;
- default:
- break;
- }
- }
- usb_rx_memory_needed = 0;
- for ( i = 1; i <= NUM_ENDPOINTS; i++ )
- {
- epconf = *cfg++;
- *reg = epconf;
- reg += 4;
- if ( epconf & USB_ENDPT_EPRXEN )
- {
- usb_packet_t *p;
- p = usb_malloc();
- if ( p )
- {
- table[ index( i, RX, EVEN ) ].addr = p->buf;
- table[ index( i, RX, EVEN ) ].desc = BDT_DESC( 64, 0 );
- }
- else
- {
- table[ index( i, RX, EVEN ) ].desc = 0;
- usb_rx_memory_needed++;
- }
- p = usb_malloc();
- if ( p )
- {
- table[ index( i, RX, ODD ) ].addr = p->buf;
- table[ index( i, RX, ODD ) ].desc = BDT_DESC( 64, 1 );
- }
- else
- {
- table[ index( i, RX, ODD ) ].desc = 0;
- usb_rx_memory_needed++;
- }
- }
- table[ index( i, TX, EVEN ) ].desc = 0;
- table[ index( i, TX, ODD ) ].desc = 0;
- }
- goto send;
-
- case 0x0880: // GET_CONFIGURATION
- reply_buffer[0] = usb_configuration;
- datalen = 1;
- data = reply_buffer;
- goto send;
-
- case 0x0080: // GET_STATUS (device)
- reply_buffer[0] = 0;
- reply_buffer[1] = 0;
- datalen = 2;
- data = reply_buffer;
- goto send;
-
- case 0x0082: // GET_STATUS (endpoint)
- if ( setup.wIndex > NUM_ENDPOINTS )
- {
- // TODO: do we need to handle IN vs OUT here?
- endpoint0_stall();
- return;
- }
- reply_buffer[0] = 0;
- reply_buffer[1] = 0;
- if ( *(uint8_t *)(&USB0_ENDPT0 + setup.wIndex * 4) & 0x02 )
- reply_buffer[0] = 1;
- data = reply_buffer;
- datalen = 2;
- goto send;
-
- case 0x0100: // CLEAR_FEATURE (device)
- switch ( setup.wValue )
- {
- // CLEAR_FEATURE(DEVICE_REMOTE_WAKEUP)
- // See SET_FEATURE(DEVICE_REMOTE_WAKEUP) for details
- case 0x1:
- goto send;
- }
-
- warn_msg("SET_FEATURE - Device wValue(");
- printHex( setup.wValue );
- print( ")" NL );
- endpoint0_stall();
- return;
-
- case 0x0101: // CLEAR_FEATURE (interface)
- // TODO: Currently ignoring, perhaps useful? -HaaTa
- warn_msg("CLEAR_FEATURE - Interface wValue(");
- printHex( setup.wValue );
- print(") wIndex(");
- printHex( setup.wIndex );
- print( ")" NL );
- endpoint0_stall();
- return;
-
- case 0x0102: // CLEAR_FEATURE (endpoint)
- i = setup.wIndex & 0x7F;
- if ( i > NUM_ENDPOINTS || setup.wValue != 0 )
- {
- endpoint0_stall();
- return;
- }
- (*(uint8_t *)(&USB0_ENDPT0 + setup.wIndex * 4)) &= ~0x02;
- // TODO: do we need to clear the data toggle here?
- goto send;
-
- case 0x0300: // SET_FEATURE (device)
- switch ( setup.wValue )
- {
- // SET_FEATURE(DEVICE_REMOTE_WAKEUP)
- // XXX: Only used to confirm Remote Wake
- // Used on Mac OSX and Windows not on Linux
- // Good post on the behaviour:
- // http://community.silabs.com/t5/8-bit-MCU/Remote-wakeup-HID/m-p/74957#M30802
- case 0x1:
- goto send;
- }
-
- warn_msg("SET_FEATURE - Device wValue(");
- printHex( setup.wValue );
- print( ")" NL );
- endpoint0_stall();
- return;
-
- case 0x0301: // SET_FEATURE (interface)
- // TODO: Currently ignoring, perhaps useful? -HaaTa
- warn_msg("SET_FEATURE - Interface wValue(");
- printHex( setup.wValue );
- print(") wIndex(");
- printHex( setup.wIndex );
- print( ")" NL );
- endpoint0_stall();
- return;
-
- case 0x0302: // SET_FEATURE (endpoint)
- i = setup.wIndex & 0x7F;
- if ( i > NUM_ENDPOINTS || setup.wValue != 0 )
- {
- // TODO: do we need to handle IN vs OUT here?
- endpoint0_stall();
- return;
- }
- (*(uint8_t *)(&USB0_ENDPT0 + setup.wIndex * 4)) |= 0x02;
- // TODO: do we need to clear the data toggle here?
- goto send;
-
- case 0x0680: // GET_DESCRIPTOR
- case 0x0681:
- #ifdef UART_DEBUG
- print("desc:");
- printHex( setup.wValue );
- print( NL );
- #endif
- for ( list = usb_descriptor_list; 1; list++ )
- {
- if ( list->addr == NULL )
- break;
- if ( setup.wValue == list->wValue && setup.wIndex == list->wIndex )
- {
- data = list->addr;
- if ( (setup.wValue >> 8) == 3 )
- {
- // for string descriptors, use the descriptor's
- // length field, allowing runtime configured
- // length.
- datalen = *(list->addr);
- }
- else
- {
- datalen = list->length;
- }
-
- // XXX Power negotiation hack -HaaTa
- // Some devices such as the Apple Ipad do not support bMaxPower greater than 100 mA
- // However, there is no provision in the basic USB 2.0 stack for power negotiation
- // To get around this:
- // * Attempt to set bMaxPower to 500 mA first
- // * If more than 100 ms passes since retrieving a Get Configuration Descriptor
- // (Descriptor with bMaxPower in it)
- // * Change usb_bMaxPower to 50 (100 mA)
- // * Restart the USB init process
- // According to notes online, it says that some Apple devices can only do 20 mA
- // However, in my testing this hasn't been the case
- // (you can also draw as much current as you want if you just lie in the descriptor :P)
- // If this becomes an issue we can use this hack a second time to negotiate down to 20 mA
- // (which should be fine for just the mcu)
- if ( setup.wValue == 0x0200 && setup.wIndex == 0x0 )
- {
- power_neg_delay = 1;
- power_neg_time = systick_millis_count;
- }
-
- #if UART_DEBUG
- print("Desc found, ");
- printHex32( (uint32_t)data );
- print(",");
- printHex( datalen );
- print(",");
- printHex_op( data[0], 2 );
- printHex_op( data[1], 2 );
- printHex_op( data[2], 2 );
- printHex_op( data[3], 2 );
- printHex_op( data[4], 2 );
- printHex_op( data[5], 2 );
- print( NL );
- #endif
- goto send;
- }
- }
- #ifdef UART_DEBUG
- print( "desc: not found" NL );
- #endif
- endpoint0_stall();
- return;
-
- #if enableVirtualSerialPort_define == 1
- case 0x2221: // CDC_SET_CONTROL_LINE_STATE
- usb_cdc_line_rtsdtr = setup.wValue;
- //info_print("set control line state");
- goto send;
-
- case 0x21A1: // CDC_GET_LINE_CODING
- data = (uint8_t*)&usb_cdc_line_coding;
- datalen = sizeof( usb_cdc_line_coding );
- goto send;
-
- case 0x2021: // CDC_SET_LINE_CODING
- // ZLP Reply
- // Settings are applied in PID=OUT
- goto send;
- #endif
-
- case 0x0921: // HID SET_REPORT
- // ZLP Reply
- // Settings are applied in PID=OUT
-
- #ifdef UART_DEBUG
- print("report_type(");
- printHex( setup.wValue >> 8 );
- print(")report_id(");
- printHex( setup.wValue & 0xFF );
- print(")interface(");
- printHex( setup.wIndex );
- print(")len(");
- printHex( setup.wLength );
- print(")");
- print( NL );
- #endif
-
- // Interface
- switch ( setup.wIndex & 0xFF )
- {
- // Keyboard Interface
- case KEYBOARD_INTERFACE:
- break;
- // NKRO Keyboard Interface
- case NKRO_KEYBOARD_INTERFACE:
- break;
- default:
- warn_msg("Unknown interface - ");
- printHex( setup.wIndex );
- print( NL );
- endpoint0_stall();
- return;
- }
-
- goto send;
-
- case 0x01A1: // HID GET_REPORT
- #ifdef UART_DEBUG
- print("GET_REPORT - ");
- printHex( setup.wIndex );
- print(NL);
- #endif
- // Search through descriptors returning necessary info
- for ( list = usb_descriptor_list; 1; list++ )
- {
- if ( list->addr == NULL )
- break;
- if ( list->wValue != 0x2200 )
- continue;
- if ( setup.wIndex == list->wIndex )
- {
- data = list->addr;
- datalen = list->length;
- goto send;
- }
- }
- endpoint0_stall();
- return;
-
- case 0x0A21: // HID SET_IDLE
- #ifdef UART_DEBUG
- print("SET_IDLE - ");
- printHex( setup.wValue );
- print(" - ");
- printHex( setup.wValue >> 8 );
- print(NL);
- #endif
- USBKeys_Idle_Config = (setup.wValue >> 8);
- USBKeys_Idle_Expiry = 0;
- goto send;
-
- case 0x02A1: // HID GET_IDLE
- #ifdef UART_DEBUG
- print("SET_IDLE - ");
- printHex( setup.wValue );
- print(" - ");
- printHex( USBKeys_Idle_Config );
- print(NL);
- #endif
- reply_buffer[0] = USBKeys_Idle_Config;
- data = reply_buffer;
- datalen = 1;
- goto send;
-
-
- case 0x0B21: // HID SET_PROTOCOL
- #ifdef UART_DEBUG
- print("SET_PROTOCOL - ");
- printHex( setup.wValue );
- print(" - ");
- printHex( setup.wValue & 0xFF );
- print(NL);
- #endif
- USBKeys_Protocol = setup.wValue & 0xFF; // 0 - Boot Mode, 1 - NKRO Mode
-
- // Force Boot Mode if defined by KLL
- if ( USBProtocol_define == 0 )
- {
- USBKeys_Protocol = USBProtocol_define;
- }
- goto send;
-
- case 0x03A1: /// HID GET_PROTOCOL
- #ifdef UART_DEBUG
- print("GET_PROTOCOL - ");
- printHex( setup.wValue );
- print(" - ");
- printHex( USBKeys_Protocol );
- print(NL);
- #endif
- reply_buffer[0] = USBKeys_Protocol;
- data = reply_buffer;
- datalen = 1;
- goto send;
-
- // case 0xC940:
- default:
- #ifdef UART_DEBUG_UNKNOWN
- print("UNKNOWN: ");
- printInt32( systick_millis_count - USBInit_TimeStart );
- print(" ms");
- print(NL);
- #endif
- endpoint0_stall();
- return;
- }
-
- send:
- #ifdef UART_DEBUG
- print("setup send ");
- printHex32( (uint32_t)data );
- print(",");
- for ( uint8_t c = 0; c < datalen; c++ )
- {
- printHex( data[c] );
- print(" ");
- }
- print(",");
- printHex( datalen );
- print( NL );
- #endif
-
- if ( datalen > setup.wLength )
- datalen = setup.wLength;
-
- size = datalen;
- if ( size > EP0_SIZE )
- size = EP0_SIZE;
-
- endpoint0_transmit( data, size );
- data += size;
- datalen -= size;
-
- // See if transmit has finished
- if ( datalen == 0 && size < EP0_SIZE )
- return;
-
- size = datalen;
- if ( size > EP0_SIZE )
- size = EP0_SIZE;
- endpoint0_transmit( data, size );
- data += size;
- datalen -= size;
-
- // See if transmit has finished
- if ( datalen == 0 && size < EP0_SIZE )
- return;
-
- // Save rest of transfer for later? XXX
- ep0_tx_ptr = data;
- ep0_tx_len = datalen;
- }
-
-
- //A bulk endpoint's toggle sequence is initialized to DATA0 when the endpoint
- //experiences any configuration event (configuration events are explained in
- //Sections 9.1.1.5 and 9.4.5).
-
- //Configuring a device or changing an alternate setting causes all of the status
- //and configuration values associated with endpoints in the affected interfaces
- //to be set to their default values. This includes setting the data toggle of
- //any endpoint using data toggles to the value DATA0.
-
- // For endpoints using data toggle, regardless of whether an endpoint has the
- // Halt feature set, a ClearFeature(ENDPOINT_HALT) request always results in the
- // data toggle being reinitialized to DATA0.
-
- static void usb_control( uint32_t stat )
- {
- #ifdef UART_DEBUG
- print("CONTROL - ");
- #endif
- bdt_t *b;
- uint32_t pid, size;
- uint8_t *buf;
- const uint8_t *data;
-
- b = stat2bufferdescriptor( stat );
- pid = BDT_PID( b->desc );
- buf = b->addr;
- #ifdef UART_DEBUG
- print("pid:");
- printHex(pid);
- print(", count:");
- printHex32(b->desc);
- print(" - ");
- #endif
-
- switch ( pid )
- {
- case 0x0D: // Setup received from host
- // grab the 8 byte setup info
- setup.word1 = *(uint32_t *)(buf);
- setup.word2 = *(uint32_t *)(buf + 4);
-
- // give the buffer back
- b->desc = BDT_DESC( EP0_SIZE, DATA1 );
- //table[index(0, RX, EVEN)].desc = BDT_DESC(EP0_SIZE, 1);
- //table[index(0, RX, ODD)].desc = BDT_DESC(EP0_SIZE, 1);
-
- // clear any leftover pending IN transactions
- ep0_tx_ptr = NULL;
- if ( ep0_tx_data_toggle )
- {
- }
- //if (table[index(0, TX, EVEN)].desc & 0x80) {
- //serial_print("leftover tx even\n");
- //}
- //if (table[index(0, TX, ODD)].desc & 0x80) {
- //serial_print("leftover tx odd\n");
- //}
- table[index(0, TX, EVEN)].desc = 0;
- table[index(0, TX, ODD)].desc = 0;
-
- // first IN after Setup is always DATA1
- ep0_tx_data_toggle = 1;
-
- #ifdef UART_DEBUG_UNKNOWN
- printHex( stat );
- print(" PID=SETUP wRequestAndType:");
- printHex(setup.wRequestAndType);
- print(", wValue:");
- printHex(setup.wValue);
- print(", wIndex:");
- printHex(setup.wIndex);
- print(", len:");
- printHex(setup.wLength);
- print(" -- ");
- printHex32(setup.word1);
- print(" ");
- printHex32(setup.word2);
- print(": ");
- printInt32( systick_millis_count - USBInit_TimeStart );
- print(" ms");
- print(NL);
- #endif
-
- // actually "do" the setup request
- usb_setup();
- // unfreeze the USB, now that we're ready
- USB0_CTL = USB_CTL_USBENSOFEN; // clear TXSUSPENDTOKENBUSY bit
- break;
-
- case 0x01: // OUT transaction received from host
- case 0x02:
- #ifdef UART_DEBUG_UNKNOWN
- printHex( stat );
- print(" PID=OUT wRequestAndType:");
- printHex(setup.wRequestAndType);
- print(", wValue:");
- printHex(setup.wValue);
- print(", wIndex:");
- printHex(setup.wIndex);
- print(", len:");
- printHex(setup.wLength);
- print(" -- ");
- printHex32(setup.word1);
- print(" ");
- printHex32(setup.word2);
- print(": ");
- printInt32( systick_millis_count - USBInit_TimeStart );
- print(" ms");
- print(NL);
- #endif
-
- // CDC Interface
- #if enableVirtualSerialPort_define == 1
- // CDC_SET_LINE_CODING - PID=OUT
- // XXX - Getting lots of NAKs in Linux
- if ( setup.wRequestAndType == 0x2021 )
- {
- // Copy over new line coding
- memcpy( (void*)&usb_cdc_line_coding, buf, 7 );
-
- #ifdef UART_DEBUG
- // - Unused, but for the readers info -
- print("dwDTERate(");
- printInt32( usb_cdc_line_coding.dwDTERate );
- print(")bCharFormat(");
- printHex( usb_cdc_line_coding.bCharFormat );
- print(")bParityType(");
- printHex( usb_cdc_line_coding.bParityType );
- print(")bDataBits(");
- printHex( usb_cdc_line_coding.bDataBits );
- print(")");
- print( NL );
- #endif
-
- // XXX ZLP causes timeout/delay, why? -HaaTa
- //endpoint0_transmit( NULL, 0 );
- }
- #endif
-
- // Keyboard HID SET_REPORT - PID=OUT
- #if enableKeyboard_define == 1
- // XXX - Getting lots of NAKs in Linux
- if ( setup.wRequestAndType == 0x0921 && setup.wValue & 0x200 )
- {
- #ifdef UART_DEBUG
- print("report_type(");
- printHex( setup.wValue >> 8 );
- print(")report_id(");
- printHex( setup.wValue & 0xFF );
- print(")interface(");
- printHex( setup.wIndex );
- print(")len(");
- printHex( setup.wLength );
- print(")[");
-
- for ( size_t len = 0; len < setup.wLength; len++ )
- {
- printHex( buf[ len ] );
- print(" ");
- }
- print("]");
- print( NL );
- #endif
-
- // Interface
- switch ( setup.wIndex & 0xFF )
- {
- // Keyboard Interface
- case KEYBOARD_INTERFACE:
- USBKeys_LEDs = buf[0];
- break;
- // NKRO Keyboard Interface
- case NKRO_KEYBOARD_INTERFACE:
- // Already set with the control sequence
- // Only use 2nd byte, first byte is the report id
- USBKeys_LEDs = buf[1];
- break;
- default:
- warn_msg("Unknown interface - ");
- printHex( setup.wIndex );
- print( NL );
- break;
- }
-
- // XXX ZLP causes timeout/delay, why? -HaaTa
- //endpoint0_transmit( NULL, 0 );
- }
- #endif
-
- // give the buffer back
- b->desc = BDT_DESC( EP0_SIZE, DATA1 );
- break;
-
- case 0x09: // IN transaction completed to host
- data = ep0_tx_ptr;
-
- #ifdef UART_DEBUG_UNKNOWN
- printHex( stat );
- print(" PID=IN wRequestAndType:");
- printHex(setup.wRequestAndType);
- print(", wValue:");
- printHex(setup.wValue);
- print(", wIndex:");
- printHex(setup.wIndex);
- print(", len:");
- printHex(setup.wLength);
- print(" -- ");
- printHex32(setup.word1);
- print(" ");
- printHex32(setup.word2);
- print(": ");
- printInt32( systick_millis_count - USBInit_TimeStart );
- print(" ms");
- if ( data ) print(" DATA ");
- print(NL);
- #endif
-
- // send remaining data, if any...
- if ( data )
- {
- size = ep0_tx_len;
- if (size > EP0_SIZE)
- {
- size = EP0_SIZE;
- }
- endpoint0_transmit( data, size );
- data += size;
- ep0_tx_len -= size;
- ep0_tx_ptr = (ep0_tx_len > 0 || size == EP0_SIZE) ? data : NULL;
- }
-
- if ( setup.bRequest == 5 && setup.bmRequestType == 0 )
- {
- setup.bRequest = 0;
- #ifdef UART_DEBUG
- print("set address: ");
- printHex(setup.wValue);
- print(NL);
- #endif
- USB0_ADDR = setup.wValue;
- }
-
- // CDC_SET_LINE_CODING - PID=IN
- #if enableVirtualSerialPort_define == 1
- if ( setup.wRequestAndType == 0x2021 )
- {
- // XXX ZLP causes timeout/delay, why? -HaaTa
- //endpoint0_transmit( NULL, 0 );
- }
- #endif
-
- // Keyboard HID SET_REPORT - PID=IN
- #if enableKeyboard_define == 1
- // XXX - Getting lots of NAKs in Linux
- if ( setup.wRequestAndType == 0x0921 && setup.wValue & 0x200 )
- {
- // XXX ZLP causes timeout/delay, why? -HaaTa
- //endpoint0_transmit( NULL, 0 );
- }
- #endif
-
- break;
-
- default:
- #ifdef UART_DEBUG_UNKNOWN
- print("PID=unknown: ");
- printHex(pid);
- print(": ");
- printInt32( systick_millis_count - USBInit_TimeStart );
- print(" ms");
- print(NL);
- #endif
- break;
- }
- USB0_CTL = USB_CTL_USBENSOFEN; // clear TXSUSPENDTOKENBUSY bit
- }
-
- usb_packet_t *usb_rx( uint32_t endpoint )
- {
- //print("USB RX");
- usb_packet_t *ret;
- endpoint--;
-
- // Make sure this is a valid endpoint
- if ( endpoint >= NUM_ENDPOINTS )
- {
- return NULL;
- }
-
- __disable_irq();
-
- // Receive packet, check pointer
- ret = rx_first[endpoint];
- if ( ret )
- {
- rx_first[ endpoint ] = ret->next;
- usb_rx_byte_count_data[ endpoint ] -= ret->len;
- }
-
- __enable_irq();
-
- //serial_print("rx, epidx=");
- //serial_phex(endpoint);
- //serial_print(", packet=");
- //serial_phex32(ret);
- //serial_print("\n");
- return ret;
- }
-
- static uint32_t usb_queue_byte_count( const usb_packet_t *p )
- {
- uint32_t count=0;
-
- __disable_irq();
- for ( ; p; p = p->next )
- {
- count += p->len;
- }
- __enable_irq();
- return count;
- }
-
- uint32_t usb_tx_byte_count( uint32_t endpoint )
- {
- endpoint--;
- if ( endpoint >= NUM_ENDPOINTS )
- return 0;
- return usb_queue_byte_count( tx_first[ endpoint ] );
- }
-
- uint32_t usb_tx_packet_count( uint32_t endpoint )
- {
- const usb_packet_t *p;
- uint32_t count=0;
-
- endpoint--;
- if ( endpoint >= NUM_ENDPOINTS )
- return 0;
- __disable_irq();
- for ( p = tx_first[ endpoint ]; p; p = p->next )
- count++;
- __enable_irq();
- return count;
- }
-
-
- // Called from usb_free, but only when usb_rx_memory_needed > 0, indicating
- // receive endpoints are starving for memory. The intention is to give
- // endpoints needing receive memory priority over the user's code, which is
- // likely calling usb_malloc to obtain memory for transmitting. When the
- // user is creating data very quickly, their consumption could starve reception
- // without this prioritization. The packet buffer (input) is assigned to the
- // first endpoint needing memory.
- //
- void usb_rx_memory( usb_packet_t *packet )
- {
- //print("USB RX MEMORY");
- unsigned int i;
- const uint8_t *cfg;
-
- cfg = usb_endpoint_config_table;
- //serial_print("rx_mem:");
- __disable_irq();
- for ( i = 1; i <= NUM_ENDPOINTS; i++ )
- {
- if ( *cfg++ & USB_ENDPT_EPRXEN )
- {
- if ( table[ index( i, RX, EVEN ) ].desc == 0 )
- {
- table[ index( i, RX, EVEN ) ].addr = packet->buf;
- table[ index( i, RX, EVEN ) ].desc = BDT_DESC( 64, 0 );
- usb_rx_memory_needed--;
- __enable_irq();
- //serial_phex(i);
- //serial_print(",even\n");
- return;
- }
- if ( table[ index( i, RX, ODD ) ].desc == 0 )
- {
- table[ index( i, RX, ODD ) ].addr = packet->buf;
- table[ index( i, RX, ODD ) ].desc = BDT_DESC( 64, 1 );
- usb_rx_memory_needed--;
- __enable_irq();
- //serial_phex(i);
- //serial_print(",odd\n");
- return;
- }
- }
- }
- __enable_irq();
- // we should never reach this point. If we get here, it means
- // usb_rx_memory_needed was set greater than zero, but no memory
- // was actually needed.
- usb_rx_memory_needed = 0;
- usb_free( packet );
- return;
- }
-
- // Call whenever there's an action that may wake the host device
- void usb_resume()
- {
- // If we have been sleeping, try to wake up host
- if ( usb_dev_sleep && usb_configured() )
- {
- #if enableUSBResume_define == 1
- #if enableVirtualSerialPort_define != 1
- info_print("Attempting to resume the host");
- #endif
- // Force wake-up for 10 ms
- // According to the USB Spec a device must hold resume for at least 1 ms but no more than 15 ms
- USB0_CTL |= USB_CTL_RESUME;
- delay(10);
- USB0_CTL &= ~(USB_CTL_RESUME);
- delay(50); // Wait for at least 50 ms to make sure the bus is clear
- usb_dev_sleep = 0; // Make sure we don't call this again, may crash system
- #else
- warn_print("Host Resume Disabled");
- #endif
- }
-
- }
-
- void usb_tx( uint32_t endpoint, usb_packet_t *packet )
- {
- // Update expiry counter
- USBKeys_Idle_Expiry = systick_millis_count;
-
- // Since we are transmitting data, USB will be brought out of sleep/suspend
- // if it's in that state
- // Use the currently set descriptor value
- Output_update_usb_current( *usb_bMaxPower * 2 );
-
- bdt_t *b = &table[ index( endpoint, TX, EVEN ) ];
- uint8_t next;
-
- endpoint--;
- if ( endpoint >= NUM_ENDPOINTS )
- return;
- __disable_irq();
- //serial_print("txstate=");
- //serial_phex(tx_state[ endpoint ]);
- //serial_print("\n");
- switch ( tx_state[ endpoint ] )
- {
- case TX_STATE_BOTH_FREE_EVEN_FIRST:
- next = TX_STATE_ODD_FREE;
- break;
- case TX_STATE_BOTH_FREE_ODD_FIRST:
- b++;
- next = TX_STATE_EVEN_FREE;
- break;
- case TX_STATE_EVEN_FREE:
- next = TX_STATE_NONE_FREE_ODD_FIRST;
- break;
- case TX_STATE_ODD_FREE:
- b++;
- next = TX_STATE_NONE_FREE_EVEN_FIRST;
- break;
- default:
- if (tx_first[ endpoint ] == NULL)
- {
- tx_first[ endpoint ] = packet;
- }
- else
- {
- tx_last[ endpoint ]->next = packet;
- }
- tx_last[ endpoint ] = packet;
- __enable_irq();
- return;
- }
-
- tx_state[ endpoint ] = next;
- b->addr = packet->buf;
- b->desc = BDT_DESC( packet->len, ((uint32_t)b & 8) ? DATA1 : DATA0 );
- __enable_irq();
- }
-
-
- void usb_device_reload()
- {
- // MCHCK
- // Kiibohd mk20dx256vlh7
- #if defined(_mk20dx128vlf5_) || defined(_mk20dx256vlh7_)
- // Copies variable into the VBAT register, must be identical to the variable in the bootloader to jump to the bootloader flash mode
- for ( int pos = 0; pos < sizeof(sys_reset_to_loader_magic); pos++ )
- (&VBAT)[ pos ] = sys_reset_to_loader_magic[ pos ];
- SOFTWARE_RESET();
-
- // Teensy 3.0 and 3.1
- #else
- asm volatile("bkpt");
- #endif
- }
-
-
- void usb_isr()
- {
- uint8_t status, stat, t;
-
- restart:
- status = USB0_ISTAT;
- /*
- print(" ISR(");
- printHex( status );
- print(") ");
- */
-
- if ( (status & USB_INTEN_SOFTOKEN /* 04 */ ) )
- {
- if ( usb_configuration )
- {
- t = usb_reboot_timer;
- if ( t )
- {
- usb_reboot_timer = --t;
- if ( !t )
- usb_device_reload();
- }
-
- // CDC Interface
- #if enableVirtualSerialPort_define == 1
- t = usb_cdc_transmit_flush_timer;
- if ( t )
- {
- usb_cdc_transmit_flush_timer = --t;
- if ( t == 0 )
- usb_serial_flush_callback();
- }
- #endif
-
- }
- USB0_ISTAT = USB_INTEN_SOFTOKEN;
- }
-
- if ( (status & USB_ISTAT_TOKDNE /* 08 */ ) )
- {
- uint8_t endpoint;
- stat = USB0_STAT;
- //serial_print("token: ep=");
- //serial_phex(stat >> 4);
- //serial_print(stat & 0x08 ? ",tx" : ",rx");
- //serial_print(stat & 0x04 ? ",odd\n" : ",even\n");
- endpoint = stat >> 4;
- if ( endpoint == 0 )
- {
- usb_control( stat );
- }
- else
- {
- bdt_t *b = stat2bufferdescriptor(stat);
- usb_packet_t *packet = (usb_packet_t *)((uint8_t *)(b->addr) - 8);
- #if 0
- serial_print("ep:");
- serial_phex(endpoint);
- serial_print(", pid:");
- serial_phex(BDT_PID(b->desc));
- serial_print(((uint32_t)b & 8) ? ", odd" : ", even");
- serial_print(", count:");
- serial_phex(b->desc >> 16);
- serial_print("\n");
- #endif
- endpoint--; // endpoint is index to zero-based arrays
-
- if ( stat & 0x08 )
- { // transmit
- usb_free( packet );
- packet = tx_first[ endpoint ];
- if ( packet )
- {
- //serial_print("tx packet\n");
- tx_first[endpoint] = packet->next;
- b->addr = packet->buf;
- switch ( tx_state[ endpoint ] )
- {
- case TX_STATE_BOTH_FREE_EVEN_FIRST:
- tx_state[ endpoint ] = TX_STATE_ODD_FREE;
- break;
- case TX_STATE_BOTH_FREE_ODD_FIRST:
- tx_state[ endpoint ] = TX_STATE_EVEN_FREE;
- break;
- case TX_STATE_EVEN_FREE:
- tx_state[ endpoint ] = TX_STATE_NONE_FREE_ODD_FIRST;
- break;
- case TX_STATE_ODD_FREE:
- tx_state[ endpoint ] = TX_STATE_NONE_FREE_EVEN_FIRST;
- break;
- default:
- break;
- }
- b->desc = BDT_DESC( packet->len, ((uint32_t)b & 8) ? DATA1 : DATA0 );
- } else {
- //serial_print("tx no packet\n");
- switch ( tx_state[ endpoint ] )
- {
- case TX_STATE_BOTH_FREE_EVEN_FIRST:
- case TX_STATE_BOTH_FREE_ODD_FIRST:
- break;
- case TX_STATE_EVEN_FREE:
- tx_state[ endpoint ] = TX_STATE_BOTH_FREE_EVEN_FIRST;
- break;
- case TX_STATE_ODD_FREE:
- tx_state[ endpoint ] = TX_STATE_BOTH_FREE_ODD_FIRST;
- break;
- default:
- tx_state[ endpoint ] = ((uint32_t)b & 8)
- ? TX_STATE_ODD_FREE
- : TX_STATE_EVEN_FREE;
- break;
- }
- }
- }
- else
- { // receive
- packet->len = b->desc >> 16;
- if ( packet->len > 0 )
- {
- packet->index = 0;
- packet->next = NULL;
- if ( rx_first[ endpoint ] == NULL )
- {
- //serial_print("rx 1st, epidx=");
- //serial_phex(endpoint);
- //serial_print(", packet=");
- //serial_phex32((uint32_t)packet);
- //serial_print("\n");
- rx_first[ endpoint ] = packet;
- }
- else
- {
- //serial_print("rx Nth, epidx=");
- //serial_phex(endpoint);
- //serial_print(", packet=");
- //serial_phex32((uint32_t)packet);
- //serial_print("\n");
- rx_last[ endpoint ]->next = packet;
- }
- rx_last[ endpoint ] = packet;
- usb_rx_byte_count_data[ endpoint ] += packet->len;
- // TODO: implement a per-endpoint maximum # of allocated packets
- // so a flood of incoming data on 1 endpoint doesn't starve
- // the others if the user isn't reading it regularly
- packet = usb_malloc();
- if ( packet )
- {
- b->addr = packet->buf;
- b->desc = BDT_DESC( 64, ((uint32_t)b & 8) ? DATA1 : DATA0 );
- }
- else
- {
- //serial_print("starving ");
- //serial_phex(endpoint + 1);
- //serial_print(((uint32_t)b & 8) ? ",odd\n" : ",even\n");
- b->desc = 0;
- usb_rx_memory_needed++;
- }
- }
- else
- {
- b->desc = BDT_DESC( 64, ((uint32_t)b & 8) ? DATA1 : DATA0 );
- }
- }
-
-
-
-
- }
- USB0_ISTAT = USB_ISTAT_TOKDNE;
- goto restart;
- }
-
-
- if ( status & USB_ISTAT_USBRST /* 01 */ )
- {
- //serial_print("reset\n");
-
- // initialize BDT toggle bits
- USB0_CTL = USB_CTL_ODDRST;
- ep0_tx_bdt_bank = 0;
-
- // set up buffers to receive Setup and OUT packets
- table[index( 0, RX, EVEN ) ].desc = BDT_DESC( EP0_SIZE, 0 );
- table[index( 0, RX, EVEN ) ].addr = ep0_rx0_buf;
- table[index( 0, RX, ODD ) ].desc = BDT_DESC( EP0_SIZE, 0 );
- table[index( 0, RX, ODD ) ].addr = ep0_rx1_buf;
- table[index( 0, TX, EVEN ) ].desc = 0;
- table[index( 0, TX, ODD ) ].desc = 0;
-
- // activate endpoint 0
- USB0_ENDPT0 = USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
-
- // clear all ending interrupts
- USB0_ERRSTAT = 0xFF;
- USB0_ISTAT = 0xFF;
-
- // set the address to zero during enumeration
- USB0_ADDR = 0;
-
- // enable other interrupts
- USB0_ERREN = 0xFF;
- USB0_INTEN = USB_INTEN_TOKDNEEN |
- USB_INTEN_SOFTOKEN |
- USB_INTEN_STALLEN |
- USB_INTEN_ERROREN |
- USB_INTEN_USBRSTEN |
- USB_INTEN_RESUMEEN |
- USB_INTEN_SLEEPEN;
-
- // is this necessary?
- USB0_CTL = USB_CTL_USBENSOFEN;
- return;
- }
-
-
- if ( (status & USB_ISTAT_STALL /* 80 */ ) )
- {
- //serial_print("stall:\n");
- USB0_ENDPT0 = USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
- USB0_ISTAT = USB_ISTAT_STALL;
- }
- if ( (status & USB_ISTAT_ERROR /* 02 */ ) )
- {
- uint8_t err = USB0_ERRSTAT;
- USB0_ERRSTAT = err;
- //serial_print("err:");
- //serial_phex(err);
- //serial_print("\n");
- USB0_ISTAT = USB_ISTAT_ERROR;
- }
-
- // USB Host signalling device to enter 'sleep' state
- // The USB Module triggers this interrupt when it detects the bus has been idle for 3 ms
- if ( (status & USB_ISTAT_SLEEP /* 10 */ ) )
- {
- #if enableUSBSuspend_define == 1
- // Can cause issues with the virtual serial port
- #if enableVirtualSerialPort_define != 1
- info_print("Host has requested USB sleep/suspend state");
- #endif
- Output_update_usb_current( 100 ); // Set to 100 mA
- usb_dev_sleep = 1;
- #else
- info_print("USB Suspend Detected - Firmware USB Suspend Disabled");
- #endif
- USB0_ISTAT |= USB_ISTAT_SLEEP;
- }
-
- // On USB Resume, unset the usb_dev_sleep so we don't keep sending resume signals
- if ( (status & USB_ISTAT_RESUME /* 20 */ ) )
- {
- // Can cause issues with the virtual serial port
- #if enableVirtualSerialPort_define != 1
- info_print("Host has woken-up/resumed from sleep/suspend state");
- #endif
- Output_update_usb_current( *usb_bMaxPower * 2 );
- usb_dev_sleep = 0;
- USB0_ISTAT |= USB_ISTAT_RESUME;
- }
- }
-
-
-
- uint8_t usb_init()
- {
- #ifdef UART_DEBUG
- print("USB INIT"NL);
- #endif
-
- USBInit_TimeStart = systick_millis_count;
- USBInit_Ticks = 0;
-
- // XXX Set wTotalLength here instead of using defines
- // Simplifies defines considerably
- usb_set_config_descriptor_size();
-
- #if defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) || defined(_mk20dx256vlh7_)
- // Write the unique id to the USB Descriptor memory location
- // It's split up into 4 32 bit registers
- // 1) Read out register
- // 2) Convert to UTF-16-LE
- // 3) Write to USB Descriptor Memory (space is pre-allocated)
- extern struct usb_string_descriptor_struct usb_string_serial_number_default;
- hex32ToStr16( SIM_UIDH, &(usb_string_serial_number_default.wString[0]), 8 );
- hex32ToStr16( SIM_UIDMH, &(usb_string_serial_number_default.wString[8]), 8 );
- hex32ToStr16( SIM_UIDML, &(usb_string_serial_number_default.wString[16]), 8 );
- hex32ToStr16( SIM_UIDL, &(usb_string_serial_number_default.wString[24]), 8 );
- #endif
-
- // Clear out endpoints table
- for ( int i = 0; i <= NUM_ENDPOINTS * 4; i++ )
- {
- table[i].desc = 0;
- table[i].addr = 0;
- }
-
- // this basically follows the flowchart in the Kinetis
- // Quick Reference User Guide, Rev. 1, 03/2012, page 141
-
- // assume 48 MHz clock already running
- // SIM - enable clock
- SIM_SCGC4 |= SIM_SCGC4_USBOTG;
-
- // reset USB module
- USB0_USBTRC0 = USB_USBTRC_USBRESET;
- while ( (USB0_USBTRC0 & USB_USBTRC_USBRESET) != 0 ); // wait for reset to end
-
- // set desc table base addr
- USB0_BDTPAGE1 = ((uint32_t)table) >> 8;
- USB0_BDTPAGE2 = ((uint32_t)table) >> 16;
- USB0_BDTPAGE3 = ((uint32_t)table) >> 24;
-
- // clear all ISR flags
- USB0_ISTAT = 0xFF;
- USB0_ERRSTAT = 0xFF;
- USB0_OTGISTAT = 0xFF;
-
- USB0_USBTRC0 |= 0x40; // undocumented bit
-
- // enable USB
- USB0_CTL = USB_CTL_USBENSOFEN;
- USB0_USBCTRL = 0;
-
- // enable reset interrupt
- USB0_INTEN = USB_INTEN_USBRSTEN;
-
- // enable interrupt in NVIC...
- NVIC_SET_PRIORITY( IRQ_USBOTG, 112 );
- NVIC_ENABLE_IRQ( IRQ_USBOTG );
-
- // enable d+ pullup
- USB0_CONTROL = USB_CONTROL_DPPULLUPNONOTG;
-
- // Do not check for power negotiation delay until Get Configuration Descriptor
- power_neg_delay = 0;
-
- // During initialization host isn't sleeping
- usb_dev_sleep = 0;
-
- return 1;
- }
-
- // return 0 if the USB is not configured, or the configuration
- // number selected by the HOST
- uint8_t usb_configured()
- {
- return usb_configuration;
- }
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