Driver Usb Downloader Atmega8

Driver usb downloader atmega8 0

AVRUSBBoot - USB bootloader for Atmel AVR controllers AVRUSBBoot is a bootloader for the Atmel AVR controllers. It uses afirmware-only USB driver to transfer binary data from the PC to theflash of the controller. Once the AVR is flashed with the bootloader,no other ISP programmer is needed; then the microcontroller can be reprogrammed overUSB. Features. Software works under multiple platforms. Linux, Mac OS X and Windows are tested.

Tested with ATMega8-16. No special USB controllers or smd components are needed. Bootloader fits into 1024 word bootloader blockHardwareBasically AVRUSBBoot can be used with all circuits which are supported by the AVR USB driver.To switch between the bootloader and the application, an aditional jumper is necessary.Here is an example (Here the levels on the data lines are 5V which doesn't meet theUSB specification! The supply voltage should be regulated to 3,3V - 3,6V): Firmware and adaptationThe firmware has to be adapted to your hardware.

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All necessary changes hasto be done in the following two files:. bootloaderconfig.h: Define the condition when the bootloader should be started, e.g. Ifa special pin is put to ground with a jumper, and the initialisation of the hardware. usbconfig.h: Define the used data line pins. You have to adapt USBCFGIOPORT,USBCFGDMINUSBIT and USBCFGDPLUSBIT to your hardware. The rest should be leftunchanged.Compile the firmware.

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You need avr-gcc, avr-binutils and avr-libc:$ cd firmware$ makeThe bootloader firmware has to be written to the controller with a ISP programmer.Once the bootloader is flashed, you don't need a programmer and you can download thebinary data over USB. Don't forget to set the fuses for the external clock source whenflashing the bootloader for the first time!SoftwareA C tool for downloading hex files is provided.To compile the program, you need libusb.$ cd software$ makeWhen the device is connected andthe bootloader is started (set the jumper before connecting the device), hex files canbe written to the flash of the microcontroller:$./avrusbboot test.hex Download(128 kB) LinksFirmware-only AVR USB driverlibusbLibUsb-Win32.

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