Add short delays before detaching from the USB bus in the bootloaders (thanks to NicoHood).

Bootloaders/CDC/BootloaderCDC.h

@@ -43,6 +43,7 @@
 		#include <avr/eeprom.h>
 		#include <avr/power.h>
 		#include <avr/interrupt.h>
+		#include <util/delay.h>
 		#include <stdbool.h>
 
 		#include "Descriptors.h"

Bootloaders/DFU/BootloaderDFU.c

@@ -191,6 +191,9 @@ int main(void)
 	while (RunBootloader || WaitForExit)
 	  USB_USBTask();
 
+	/* Wait a short time to end all USB transactions and then disconnect */
+	_delay_us(1000);
+
 	/* Reset configured hardware back to their original states for the user application */
 	ResetHardware();
 

Bootloaders/HID/BootloaderHID.c

@@ -84,6 +84,9 @@ int main(void)
 	while (RunBootloader)
 	  USB_USBTask();
 
+	/* Wait a short time to end all USB transactions and then disconnect */
+	_delay_us(1000);
+
 	/* Disconnect from the host - USB interface will be reset later along with the AVR */
 	USB_Detach();
 

Bootloaders/HID/BootloaderHID.h

@@ -43,6 +43,7 @@
 		#include <avr/power.h>
 		#include <avr/interrupt.h>
 		#include <util/atomic.h>
+		#include <util/delay.h>
 		#include <stdbool.h>
 
 		#include "Descriptors.h"

Bootloaders/MassStorage/BootloaderMassStorage.c

@@ -169,6 +169,9 @@ int main(void)
 		USB_USBTask();
 	}
 
+	/* Wait a short time to end all USB transactions and then disconnect */
+	_delay_us(1000);
+
 	/* Disconnect from the host - USB interface will be reset later along with the AVR */
 	USB_Detach();
 

Bootloaders/MassStorage/BootloaderMassStorage.h

@@ -41,6 +41,7 @@
 		#include <avr/wdt.h>
 		#include <avr/power.h>
 		#include <avr/interrupt.h>
+		#include <util/delay.h>
 		#include <string.h>
 
 		#include "Descriptors.h"

Bootloaders/Printer/BootloaderPrinter.c

@@ -401,6 +401,9 @@ int main(void)
 		USB_USBTask();
 	}
 
+	/* Wait a short time to end all USB transactions and then disconnect */
+	_delay_us(1000);
+
 	/* Disconnect from the host - USB interface will be reset later along with the AVR */
 	USB_Detach();
 

Bootloaders/Printer/BootloaderPrinter.h

@@ -41,6 +41,7 @@
 		#include <avr/wdt.h>
 		#include <avr/power.h>
 		#include <avr/interrupt.h>
+		#include <util/delay.h>
 
 		#include "Descriptors.h"
 		#include "BootloaderAPI.h"