Make sure that USB_STREAM_TIMEOUT_MS is set in the MassStorageHost ClassDriver demo, so that slow devices don't time out the data pipe. Increase pipe timeout in both MassStorageHost demos to 5 seconds to account for the really slow devices.

Fix TeensyHID bootloader not properly shutting down the USB interface to trigger a disconnection on the host before resetting the AVR.

Bootloaders/TeensyHID/TeensyHID.c

@@ -52,8 +52,8 @@ int main(void)
 	while (RunBootloader)
 	  USB_USBTask();
 	
-	/* Wait 100ms to give the host time to register the disconnection */
+	/* Turn off the USB interface, disconnect from the host */
-	_delay_ms(100);
+	USB_ShutDown();
 
 	/* Enable the watchdog and force a timeout to reset the AVR */
 	wdt_enable(WDTO_250MS);

Demos/Host/ClassDriver/MassStorageHost/makefile

@@ -118,6 +118,7 @@ LUFA_PATH = ../../../..
 # LUFA library compile-time options
 LUFA_OPTS  = -D USB_HOST_ONLY
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
+LUFA_OPTS += -D USB_STREAM_TIMEOUT_MS=5000
 
 
 # List C source files here. (C dependencies are automatically generated.)

Demos/Host/LowLevel/MassStorageHost/makefile

@@ -119,7 +119,7 @@ LUFA_PATH = ../../../..
 LUFA_OPTS  = -D NO_STREAM_CALLBACKS
 LUFA_OPTS += -D USB_HOST_ONLY
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
-LUFA_OPTS += -D USB_STREAM_TIMEOUT_MS=2000
+LUFA_OPTS += -D USB_STREAM_TIMEOUT_MS=5000
 
 
 # List C source files here. (C dependencies are automatically generated.)

LUFA/ManPages/ChangeLog.txt

@@ -11,7 +11,8 @@
   *  <b>New:</b>
   *  - Added activity LED indicators to the AVRISP project to indicate when the device is busy processing a command
   *  - The USB target family and allowable USB mode tokens are now public and documented (USB_CAN_BE_*, USB_SERIES_*_AVR)
-  *  - Added new XPLAIN USB to Serial Bridge project (thanks to John Steggall for initial proof-of-concept)
+  *  - Added new XPLAIN USB to Serial Bridge project (thanks to John Steggall for initial proof-of-concept, David Prentice
+  *    and Peter Danneger for revised software USART code)
   *  - Added new RNDIS Ethernet Host LowLevel demo
   *  - Added new RNDIS Ethernet Host Class Driver
   *  - Added new RNDIS Ethernet Host ClassDriver demo

Projects/AVRISP/Lib/PDIProtocol.c

@@ -109,7 +109,10 @@ static void PDIProtocol_EnterXPROGMode(void)
 	
 	/* Must hold DATA line high for at least 90nS to enable PDI interface */
 	PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
-	_delay_us(1);
+	asm volatile ("NOP"::);
+	#if (F_CPU > 8000000)
+	asm volatile ("NOP"::);
+	#endif
 	
 	/* Toggle CLOCK line 16 times within 100uS of the original 90nS timeout to keep PDI interface enabled */
 	for (uint8_t i = 0; i < 16; i++)