ATMEL DFU DRIVER

Slightly off topic question. Open link in a new tab. The avr-gcc compiler has the necessary headers to write your own bootloader code, which would allow me to achieve exactly what I needed, but since the chip I was using ATmega32u4 already had a stock bootloader, I wanted to use it instead. This project consists of one header file and one source file and it includes wrapper functions which allow to access the flash and fuse-bit programming functions in the stock bootloader on some of the Atmel’s USB-enabled AVR chips. No search term specified. You can download the files from my github repository. While developing my mechanical keyboard project, the GH60, I came across the need to program the flash memory during runtime.

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Microchip® Advanced Software Framework

Search or use up and down arrow keys to select an item. Unfortunately, I couldn’t find any libraries to use the functions it provided, so I decided to write my own. It also provides a convenient function which writes a whole page to the flash memory. The meaning of arguments should be self-explanatory.

Except for that, you can disable the bootloader by disabling the HWBE fuse bit or even remove the bootloader code completely while programming via SPI. Your email address will not be published.

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You can download the files from my github repository. No search term specified.

Why I wrote it While developing my mechanical keyboard project, the GH60, I came across the need to program the flash memory during runtime.

What it is This project consists of one header file and one source file armel it includes wrapper functions which allow to access the flash and fuse-bit programming functions in the stock bootloader on some of the Atmel’s USB-enabled AVR chips.

ASF Source Code Documentation

Hi Alex, normally the atmega32u4 will run the bootloader only when reset while the HWB is low. Leave a Reply Cancel reply Your email address will not be published.

Using The library provides static inlines for all the bootloader’s functions: Open link in a new tab. Slightly off topic question. The first one performs a jump to the bootloader section and gets the chip into DFU mode and the second one writes a whole flash page at address addr with provided data.

This project consists of one header file and one source file and ffu includes wrapper functions which allow to access the flash and fuse-bit programming functions in the stock bootloader on some of the Atmel’s USB-enabled AVR chips. If you have succesfully run the code on any of those devices or made modifications which allowed it to run, please let me know in the comments.

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Check out the original articlewhere I describe how it works.

Atmel DFU Bootloader ABI wrapper | komar’s techblog

While developing my mechanical keyboard project, the GH60, I came across the need to program the flash memory during runtime. So you can connect HWB to ground through a switch and then you can run the bootloader if you press this button, hold it and then reset probably by pressing another button.

The avr-gcc compiler has the necessary headers to write your own bootloader code, which would allow me to achieve exactly what I needed, but since the chip I was using ATmega32u4 already had a stock bootloader, I wanted to use it instead.