This a support USB interface avrbootloader source code also contains a complete end pc side and microcontroller code

avrusbbootloader
................\Changelog.txt
................\Readme.txt
................\bin
................\...\win-driver
................\...\..........\avrusbboot.inf
................\...\..........\libusb0.dll
................\...\..........\libusb0.sys
................\circuit
................\.......\avrusbboot_example.png
................\.......\avrusbboot_example.sch
................\firmware
................\........\Makefile
................\........\bootloaderconfig.h
................\........\checksize
................\........\main.c
................\........\usbconfig.h
................\........\usbdrv
................\........\......\Changelog.txt
................\........\......\License.txt
................\........\......\Readme.txt
................\........\......\USBID-License.txt
................\........\......\iarcompat.h
................\........\......\oddebug.c
................\........\......\oddebug.h
................\........\......\usbdrv.c
................\........\......\usbdrv.h
................\........\......\usbdrvasm.S
................\........\......\usbdrvasm.asm
................\software
................\........\Makefile
................\........\cbootloader.cpp
................\........\cbootloader.h
................\........\cflashmem.cpp
................\........\cflashmem.h
................\........\cpage.cpp
................\........\cpage.h
................\........\main.cpp

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