ports: Make new ports/ sub-directory and move all ports there.

This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.

1 files changed, 0 insertions, 980 deletions

diff --git a/teensy/core/usb_dev.c b/teensy/core/usb_dev.c
deleted file mode 100644
index 6cf85d3fd..000000000
--- a/teensy/core/usb_dev.c
+++ /dev/null
@@ -1,980 +0,0 @@
-/* Teensyduino Core Library
- * http://www.pjrc.com/teensy/
- * Copyright (c) 2013 PJRC.COM, LLC.
- *
- * 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.
- */
-
-#if F_CPU >= 20000000
-
-#include "mk20dx128.h"
-//#include "HardwareSerial.h"
-#include "usb_dev.h"
-#include "usb_mem.h"
-
-// buffer descriptor table
-
-typedef struct {
-	uint32_t desc;
-	void * addr;
-} bdt_t;
-
-__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];
-#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 BDT_PID(n)	(((n) >> 2) & 15)
-
-#define BDT_DESC(count, data)	(BDT_OWN | BDT_DTS \
-				| ((data) ? BDT_DATA1 : BDT_DATA0) \
-				| ((count) << 16))
-
-#define TX   1
-#define RX   0
-#define ODD  1
-#define EVEN 0
-#define DATA0 0
-#define DATA1 1
-#define index(endpoint, tx, odd) (((endpoint) << 2) | ((tx) << 1) | (odd))
-#define stat2bufferdescriptor(stat) (table + ((stat) >> 2))
-
-
-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;
-
-
-#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
-
-// 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 void endpoint0_stall(void)
-{
-	USB0_ENDPT0 = USB_ENDPT_EPSTALL | USB_ENDPT_EPRXEN | USB_ENDPT_EPTXEN | USB_ENDPT_EPHSHK;
-}
-
-
-static void endpoint0_transmit(const void *data, uint32_t len)
-{
-#if 0
-	serial_print("tx0:");
-	serial_phex32((uint32_t)data);
-	serial_print(",");
-	serial_phex16(len);
-	serial_print(ep0_tx_bdt_bank ? ", odd" : ", even");
-	serial_print(ep0_tx_data_toggle ? ", d1\n" : ", d0\n");
-#endif
-	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;
-}
-
-static uint8_t reply_buffer[8];
-
-static void usb_setup(void)
-{
-	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;
-
-	switch (setup.wRequestAndType) {
-	  case 0x0500: // SET_ADDRESS
-		break;
-	  case 0x0900: // SET_CONFIGURATION
-		//serial_print("configure\n");
-		usb_configuration = setup.wValue;
-		reg = &USB0_ENDPT1;
-		cfg = usb_endpoint_config_table;
-		// 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;
-		}
-		break;
-	  case 0x0880: // GET_CONFIGURATION
-		reply_buffer[0] = usb_configuration;
-		datalen = 1;
-		data = reply_buffer;
-		break;
-	  case 0x0080: // GET_STATUS (device)
-		reply_buffer[0] = 0;
-		reply_buffer[1] = 0;
-		datalen = 2;
-		data = reply_buffer;
-		break;
-	  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;
-		break;
-	  case 0x0102: // CLEAR_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?
-		break;
-	  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?
-		break;
-	  case 0x0680: // GET_DESCRIPTOR
-	  case 0x0681:
-		//serial_print("desc:");
-		//serial_phex16(setup.wValue);
-		//serial_print("\n");
-		for (list = usb_descriptor_list; 1; list++) {
-			if (list->addr == NULL) break;
-			//if (setup.wValue == list->wValue &&
-			//(setup.wIndex == list->wIndex) || ((setup.wValue >> 8) == 3)) {
-			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;
-				}
-#if 0
-				serial_print("Desc found, ");
-				serial_phex32((uint32_t)data);
-				serial_print(",");
-				serial_phex16(datalen);
-				serial_print(",");
-				serial_phex(data[0]);
-				serial_phex(data[1]);
-				serial_phex(data[2]);
-				serial_phex(data[3]);
-				serial_phex(data[4]);
-				serial_phex(data[5]);
-				serial_print("\n");
-#endif
-				goto send;
-			}
-		}
-		//serial_print("desc: not found\n");
-		endpoint0_stall();
-		return;
-#if defined(CDC_STATUS_INTERFACE)
-	  case 0x2221: // CDC_SET_CONTROL_LINE_STATE
-		usb_cdc_line_rtsdtr = setup.wValue;
-		//serial_print("set control line state\n");
-		break;
-	  case 0x2321: // CDC_SEND_BREAK
-		break;
-	  case 0x2021: // CDC_SET_LINE_CODING
-		//serial_print("set coding, waiting...\n");
-		return;
-#endif
-
-// TODO: this does not work... why?
-#if defined(SEREMU_INTERFACE) || defined(KEYBOARD_INTERFACE)
-	  case 0x0921: // HID SET_REPORT
-		//serial_print(":)\n");
-		return;
-	  case 0x0A21: // HID SET_IDLE
-		break;
-	  // case 0xC940:
-#endif
-	  default:
-		endpoint0_stall();
-		return;
-	}
-	send:
-	//serial_print("setup send ");
-	//serial_phex32(data);
-	//serial_print(",");
-	//serial_phex16(datalen);
-	//serial_print("\n");
-
-	if (datalen > setup.wLength) datalen = setup.wLength;
-	size = datalen;
-	if (size > EP0_SIZE) size = EP0_SIZE;
-	endpoint0_transmit(data, size);
-	data += size;
-	datalen -= size;
-	if (datalen == 0 && size < EP0_SIZE) return;
-
-	size = datalen;
-	if (size > EP0_SIZE) size = EP0_SIZE;
-	endpoint0_transmit(data, size);
-	data += size;
-	datalen -= size;
-	if (datalen == 0 && size < EP0_SIZE) return;
-
-	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.
-
-
-
-// #define stat2bufferdescriptor(stat) (table + ((stat) >> 2))
-
-static void usb_control(uint32_t stat)
-{
-	bdt_t *b;
-	uint32_t pid, size;
-	uint8_t *buf;
-	const uint8_t *data;
-
-	b = stat2bufferdescriptor(stat);
-	pid = BDT_PID(b->desc);
-	//count = b->desc >> 16;
-	buf = b->addr;
-	//serial_print("pid:");
-	//serial_phex(pid);
-	//serial_print(", count:");
-	//serial_phex(count);
-	//serial_print("\n");
-
-	switch (pid) {
-	case 0x0D: // Setup received from host
-		//serial_print("PID=Setup\n");
-		//if (count != 8) ; // panic?
-		// 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;
-
-#if 0
-		serial_print("bmRequestType:");
-		serial_phex(setup.bmRequestType);
-		serial_print(", bRequest:");
-		serial_phex(setup.bRequest);
-		serial_print(", wValue:");
-		serial_phex16(setup.wValue);
-		serial_print(", wIndex:");
-		serial_phex16(setup.wIndex);
-		serial_print(", len:");
-		serial_phex16(setup.wLength);
-		serial_print("\n");
-#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:
-		//serial_print("PID=OUT\n");
-#ifdef CDC_STATUS_INTERFACE
-		if (setup.wRequestAndType == 0x2021 /*CDC_SET_LINE_CODING*/) {
-			int i;
-			uint8_t *dst = (uint8_t *)usb_cdc_line_coding;
-			//serial_print("set line coding ");
-			for (i=0; i<7; i++) {
-				//serial_phex(*buf);
-				*dst++ = *buf++;
-			}
-			//serial_phex32(usb_cdc_line_coding[0]);
-			//serial_print("\n");
-			if (usb_cdc_line_coding[0] == 134) usb_reboot_timer = 15;
-			endpoint0_transmit(NULL, 0);
-		}
-#endif
-#ifdef KEYBOARD_INTERFACE
-		if (setup.word1 == 0x02000921 && setup.word2 == ((1<<16)|KEYBOARD_INTERFACE)) {
-			keyboard_leds = buf[0];
-			endpoint0_transmit(NULL, 0);
-		}
-#endif
-#ifdef SEREMU_INTERFACE
-		if (setup.word1 == 0x03000921 && setup.word2 == ((4<<16)|SEREMU_INTERFACE)
-		  && buf[0] == 0xA9 && buf[1] == 0x45 && buf[2] == 0xC2 && buf[3] == 0x6B) {
-			usb_reboot_timer = 5;
-			endpoint0_transmit(NULL, 0);
-		}
-#endif
-		// give the buffer back
-		b->desc = BDT_DESC(EP0_SIZE, DATA1);
-		break;
-
-	case 0x09: // IN transaction completed to host
-		//serial_print("PID=IN:");
-		//serial_phex(stat);
-		//serial_print("\n");
-
-		// send remaining data, if any...
-		data = ep0_tx_ptr;
-		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;
-			//serial_print("set address: ");
-			//serial_phex16(setup.wValue);
-			//serial_print("\n");
-			USB0_ADDR = setup.wValue;
-		}
-
-		break;
-	//default:
-		//serial_print("PID=unknown:");
-		//serial_phex(pid);
-		//serial_print("\n");
-	}
-	USB0_CTL = USB_CTL_USBENSOFEN; // clear TXSUSPENDTOKENBUSY bit
-}
-
-
-
-
-
-
-usb_packet_t *usb_rx(uint32_t endpoint)
-{
-	usb_packet_t *ret;
-	endpoint--;
-	if (endpoint >= NUM_ENDPOINTS) return NULL;
-	__disable_irq();
-	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;
-}
-
-// TODO: make this an inline function...
-/*
-uint32_t usb_rx_byte_count(uint32_t endpoint)
-{
-	endpoint--;
-	if (endpoint >= NUM_ENDPOINTS) return 0;
-	return usb_rx_byte_count_data[endpoint];
-	//return usb_queue_byte_count(rx_first[endpoint]);
-}
-*/
-
-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)
-{
-	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;
-}
-
-//#define index(endpoint, tx, odd) (((endpoint) << 2) | ((tx) << 1) | (odd))
-//#define stat2bufferdescriptor(stat) (table + ((stat) >> 2))
-
-void usb_tx(uint32_t endpoint, usb_packet_t *packet)
-{
-	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 _reboot_Teensyduino_(void)
-{
-	// TODO: initialize R0 with a code....
-	__asm__ volatile("bkpt");
-}
-
-
-
-void usb_isr(void)
-{
-	uint8_t status, stat, t;
-
-	//serial_print("isr");
-	//status = USB0_ISTAT;
-	//serial_phex(status);
-	//serial_print("\n");
-	restart:
-	status = USB0_ISTAT;
-
-	if ((status & USB_INTEN_SOFTOKEN /* 04 */ )) {
-		if (usb_configuration) {
-			t = usb_reboot_timer;
-			if (t) {
-				usb_reboot_timer = --t;
-				if (!t) _reboot_Teensyduino_();
-			}
-#ifdef CDC_DATA_INTERFACE
-			t = usb_cdc_transmit_flush_timer;
-			if (t) {
-				usb_cdc_transmit_flush_timer = --t;
-				if (t == 0) usb_serial_flush_callback();
-			}
-#endif
-#ifdef SEREMU_INTERFACE
-			t = usb_seremu_transmit_flush_timer;
-			if (t) {
-				usb_seremu_transmit_flush_timer = --t;
-				if (t == 0) usb_seremu_flush_callback();
-			}
-#endif
-#ifdef MIDI_INTERFACE
-                        usb_midi_flush_output();
-#endif
-#ifdef FLIGHTSIM_INTERFACE
-			usb_flightsim_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_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;
-	}
-
-	if ((status & USB_ISTAT_SLEEP /* 10 */ )) {
-		//serial_print("sleep\n");
-		USB0_ISTAT = USB_ISTAT_SLEEP;
-	}
-
-}
-
-
-
-void usb_init(void)
-{
-	int i;
-
-	//serial_begin(BAUD2DIV(115200));
-	//serial_print("usb_init\n");
-
-	usb_init_serialnumber();
-
-	for (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;
-}
-
-
-#else // F_CPU < 20 MHz
-
-void usb_init(void)
-{
-}
-
-#endif // F_CPU >= 20 MHz