The relevant parameters in the boards.txt specs will have low_fuses, high_fuses, and extended_fuses in their names. This article covers making a variant of an existing board where only the fuses have been changed. You can safely add new boards here if you go through a somewhat cumbersome process involving a few additional files. If you make additions here, the IDE may overwrite them or you might corrupt the ability for the IDE to successfully add/remove/update boards. This area is designed to be managed by the IDE. It's my understanding that you can add your custom board descriptions in these areas, but the prevailing advice is not to. If you have added additional boards using the IDE, you are likely to find additional folders for their architectures under /your-Arduino-profile-folder/packages or its subfolders. It might be a copy of the boards.txt that shipped with the installation bundle, or it might have been subsequently updated by the IDE. The boards.txt here is one that the Aurdino IDE actually uses. The Arduino profile folder on Linux systems is /home//.arduino15. You can see the path to your profile folder towards the end of the Preferences dialog box. Rather it's where global application configuration information is stored. your-Arduino-profile-folder/packages/arduino/hardware/avr/ You will find another boards.txt file if you look in Those that apply to a specific version are prefixed with. ![]() ![]() Bootloader parameters that apply to all Pro Minis are prefixed with pro.bootloader. The syntax here is a little more elaborate because the Pro and Pro Mini come in different flavors: they have been made with both ATmega328P and ATmega168 micros, and in 5V/16MHz and 3.3V/8MHz versions. If you do some more searching, you'll find an entry for You can see hexadecimal entries for the low bits, high bits, and extended bits along with the lock and unlock bits. Knowing this, you can probably make at least partial sense of some of the parameters. These are all parameters that describe the specifics of the Arduino/Genuino Uno board. When you open this boards.txt file in a text editor, look for the line:įollowing that are a number of lines starting with uno. This is not where you will add descriptions for your custom board or existing board with modified fuse settings, but it's good place to look to begin to grok the syntax. This file has board descriptions written in a syntax the IDE understands for default boards Arduino supported at the time the package was released. path-where-you-installed-arduino/hardware/arduino/avr It may not be very relevant to other micro families.Ī board.txt file is included in the Arduino package you installed. ![]() However, what I cover should be adaptable to other Arduinos that use other ATmega processors. In this article, I will investigate using fuses to configure a 3.3V/8MHz Pro Mini to set a brown-out detection level that is different from what the standard 3.3V/8MHz Pro Mini uses because this happens to be the use case that has driven me to learn about this. However, you can gain finer-grained control over your project by setting the micro's fuses yourself. Programming fuses can be scary because if you don't do it right, you can brick the micro. Another layer is the so-called fuses inside an ATmega microcontroller.įuses are programmable nonvolatile registers that are used to configure things like what the clock source and rate for the microcontroller is, whether brown-out detection is enabled, whether you're using a bootloader and if so how much flash will be reserved for a bootloader. Programming your device with the code you want to execute, whether with a bootloader or directly with a programmer, is one layer of programming your device.
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