diff --git a/USBHost.h b/USBHost.h
index 9aa2b8e..9482b9e 100644
--- a/USBHost.h
+++ b/USBHost.h
@@ -32,9 +32,11 @@
 
 class USBHost;
 class USBDriver;
-typedef struct Device_struct    Device_t;
-typedef struct Pipe_struct      Pipe_t;
-typedef struct Transfer_struct  Transfer_t;
+class USBDriverTimer;
+typedef struct Device_struct       Device_t;
+typedef struct Pipe_struct         Pipe_t;
+typedef struct Transfer_struct     Transfer_t;
+//typedef struct DriverTimer_struct  DriverTimer_t;
 
 // setup_t holds the 8 byte USB SETUP packet data.
 // These unions & structs allow convenient access to
@@ -141,6 +143,7 @@ struct Transfer_struct {
 	uint32_t   unused;
 };
 
+
 /************************************************/
 /*  Main USB EHCI Controller                    */
 /************************************************/
@@ -227,6 +230,11 @@ protected:
 
 // All USB device drivers inherit from this base class.
 class USBDriver : public USBHost {
+public:
+	// TODO: user-level functions
+	// check if device is bound/active/online
+	// query vid, pid
+	// query string: manufacturer, product, serial number
 protected:
 	USBDriver() : next(NULL), device(NULL) {}
 	// Check if a driver wishes to claim a device or interface or group
@@ -248,6 +256,10 @@ protected:
 	// transfers and wishes to be notified when they complete.
 	virtual void control(const Transfer_t *transfer) { }
 
+	// When any of the USBDriverTimer objects a driver creates generates
+	// a timer event, this function is called.
+	virtual void timer(USBDriverTimer &whichTimer) { }
+
 	// When a device disconnects from the USB, this function is called.
 	// The driver must free all resources it allocated and update any
 	// internal state necessary to deal with the possibility of user
@@ -268,13 +280,24 @@ protected:
 	Device_t *device;
 
 	friend class USBHost;
-public:
-	// TODO: user-level functions
-	// check if device is bound/active/online
-	// query vid, pid
-	// query string: manufacturer, product, serial number
 };
 
+// Device drivers may create these timer objects to schedule a timer call
+class USBDriverTimer {
+public:
+	USBDriverTimer() { }
+	USBDriverTimer(USBDriver *d) : driver(d) { }
+	void init(USBDriver *d) { driver = d; };
+	void start(uint32_t microseconds);
+	void *pointer;
+	uint32_t integer;
+private:
+	USBDriver      *driver;
+	uint32_t       usec;
+	USBDriverTimer *next;
+	USBDriverTimer *prev;
+	friend class USBHost;
+};
 
 /************************************************/
 /*  USB Device Drivers                          */
@@ -295,6 +318,8 @@ protected:
 	void status_change(const Transfer_t *transfer);
 	void new_port_status(uint32_t port, uint32_t status);
 	void update_status();
+	USBDriverTimer mytimer;
+	USBDriverTimer othertimer;
 	setup_t setup;
 	uint8_t hub_desc[16];
 	uint8_t endpoint;
diff --git a/ehci.cpp b/ehci.cpp
index 5a1d0ec..e984923 100644
--- a/ehci.cpp
+++ b/ehci.cpp
@@ -43,6 +43,7 @@ static Transfer_t *async_followup_first=NULL;
 static Transfer_t *async_followup_last=NULL;
 static Transfer_t *periodic_followup_first=NULL;
 static Transfer_t *periodic_followup_last=NULL;
+static USBDriverTimer *active_timers=NULL;
 
 
 static void init_qTD(volatile Transfer_t *t, void *buf, uint32_t len,
@@ -172,7 +173,7 @@ void USBHost::begin()
 	// enable interrupts, after this point interruts to all the work
 	attachInterruptVector(IRQ_USBHS, isr);
 	NVIC_ENABLE_IRQ(IRQ_USBHS);
-	USBHS_USBINTR = USBHS_USBINTR_PCE | USBHS_USBINTR_TIE0;
+	USBHS_USBINTR = USBHS_USBINTR_PCE | USBHS_USBINTR_TIE0 | USBHS_USBINTR_TIE1;
 	USBHS_USBINTR |= USBHS_USBINTR_UEE | USBHS_USBINTR_SEE;
 	USBHS_USBINTR |= USBHS_USBINTR_AAE;
 	USBHS_USBINTR |= USBHS_USBINTR_UPIE | USBHS_USBINTR_UAIE;
@@ -306,8 +307,8 @@ void USBHost::isr()
 
 		}
 	}
-	if (stat & USBHS_USBSTS_TI0) { // timer 0
-		println("timer");
+	if (stat & USBHS_USBSTS_TI0) { // timer 0 - used for built-in port events
+		println("timer0");
 		if (port_state == PORT_STATE_DEBOUNCE) {
 			port_state = PORT_STATE_RESET;
 			USBHS_PORTSC1 |= USBHS_PORTSC_PR; // begin reset sequence
@@ -321,6 +322,34 @@ void USBHost::isr()
 			rootdev = new_Device(speed, 0, 0);
 		}
 	}
+	if (stat & USBHS_USBSTS_TI1) { // timer 1 - used for USBDriverTimer
+		println("timer1");
+	}
+}
+
+void USBDriverTimer::start(uint32_t microseconds)
+{
+	Serial.print("start_timer, usec = ");
+	Serial.print(usec);
+	Serial.print(", driver = ");
+	Serial.print((uint32_t)driver, HEX);
+	Serial.print(", this = ");
+	Serial.println((uint32_t)this, HEX);
+#if 1
+	if (!driver) return;
+	if (microseconds < 100) return; // minimum timer duration
+	if (active_timers == NULL) {
+		usec = microseconds;
+		next = NULL;
+		prev = NULL;
+		active_timers = this;
+		USBHS_GPTIMER1LD = microseconds - 1;
+		USBHS_GPTIMER1CTL = USBHS_GPTIMERCTL_RST | USBHS_GPTIMERCTL_RUN;
+		return;
+	}
+#endif
+	// TODO, add to active_timers list
+	//uint32_t remain = USBHS_GPTIMER1CTL & 0xFFFFFF;
 
 }
 
@@ -403,6 +432,7 @@ Pipe_t * USBHost::new_Pipe(Device_t *dev, uint32_t type, uint32_t endpoint,
 		// bulk
 	} else if (type == 3) {
 		// interrupt
+		//pipe->qh.token = 0x80000000; // TODO: OUT starts with DATA0 or DATA1?
 	}
 	pipe->qh.capabilities[0] = QH_capabilities1(15, c, maxlen, 0,
 		dtc, dev->speed, endpoint, 0, dev->address);
diff --git a/hub.cpp b/hub.cpp
index ad2d8a2..daf46b6 100644
--- a/hub.cpp
+++ b/hub.cpp
@@ -24,7 +24,7 @@
 #include <Arduino.h>
 #include "USBHost.h"
 
-USBHub::USBHub()
+USBHub::USBHub() : /* mytimer(this), */ othertimer(this)
 {
 	// TODO: free Device_t, Pipe_t & Transfer_t we will need
 	driver_ready_for_device(this);
@@ -37,6 +37,11 @@ bool USBHub::claim(Device_t *dev, int type, const uint8_t *descriptors, uint32_t
 
 	println("USBHub claim_device this=", (uint32_t)this, HEX);
 
+	// timer testing  TODO: remove this later
+	mytimer.init(this);
+	mytimer.start(99129);
+	othertimer.start(12345);
+
 	// check for HUB type
 	if (dev->bDeviceClass != 9 || dev->bDeviceSubClass != 0) return false;
 	// protocol must be 0=FS, 1=HS Single-TT, or 2=HS Multi-TT