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USB Programming with Microcontroller. Be sure to check out the dfu-programmer documentation before forging ahead with programming over USB. Since resonators have 0. The point is that once the bootloader is loaded, the uC firmware can be upgrade in the field using just a USB cable. I have a working copy of the makefile at the bottom of my page. LUFA defines and flags:

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The final lines pull in the other LUFA libraries and tools, including the core drivers and microcontroller programming tools. LUFA avvr32 on a modular approach to this software, and comprises the following parts at a high level: This is where the USB hardware comes in. What if we want to program the board again after this?

Navigation menu Personal tools Log in. The traces on this chip are much too small to solder individually.

The following command does this and clears the lock bits in flash memory:.

Window only problem is that one would still need an ISP programmer to flash the bootloader on the chip for the first time. For the board to appear as a USB device, it must use the USB protocol to be detected by and communicate with the computer. Start developing Compilers, programmers, debuggers, code configurators, analog design tools and more. This just temporarily enters the bootloader.


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You might want to delete the versionnumber in the filename in order to make it work with existing Makefiles too. Want less hassle adding authentication and encryption capabilities to your design? To run the uploaded program, one can just do dfu-programmer target reset or pull out the board and plug it back in.

Find a product Looking for a part or a development tool? We offer a variety of ways to find the solution you need. On the other hand, microcontrollers with hardware USB support offload the necessary computations to dedicated circuitry. The project var32 are arranged as follows.

Finally, the two most interesting parts.


The finished board is below: However, this requires the fuse to be un-programmed afterward. The usage is obviously the same as the linux-version of it.

The datasheet shows some unspecified resistors here, and I discovered the reason by asking this Electronics StackExchange question.

This is where the microcontroller pin-out is defined, and the function definitions for the interface can be found. Stanley Lio, May 31,4: This serves two purposes.

The driver is included in the FLIP installation directory: If you find that USB comms is not working, use these directions: Note also the impedance matching signaling resistors, and the capacitors paired with the crystal, the values of which I borrowed from the Uno rev.


This turns out to be incorrect, and in fact the DFU bootloader would not be able to communicate over USB to the computer if this was the case.

LUFA FLIP-compatible DFU Bootloader – stanleylio

I strongly recommend this as a workflow! At this point, the programming appears to be successful, but the LED is not blinking and the device still shows up with the DFU driver. A bootloader program is not very much dffu from a normal application, except that it is placed somewhere in the flash other than 0x usually near the end of the flash address. We need some way to re-activate the bootloader to program the board.

Note that the schematic called for 22pF capacitors between the crystal terminals and ground, and 22 Ohm resistors on the signaling pins. From various datasheets and other examples, I have found several things to be aware of when designing these circuits: It will stays in bootloader mode until next reset.