The bootloader will patch itself into the reset vector of the user program. Therefore, special care has to be taken not to overwrite the bootloader if the user program uses the self programming features.

The bootloader resides in the same memory as the user program, since the ATtiny series does not support a protected bootloader section. Please invoke the command line tool with 'micronucleus -help' for a list of available options. Please use the Zadig driver installer as provided in the /windows_driver_installer folder. Windows 10: Installing unsigned drivers became more difficult in Windows 10. Linux and OS X do not require custom drivers. Clean Micronucleus devices without uploaded userprogram will not time out and allow sufficient time for proper driver installation. Windows machines will need to install the libusb drivers found in the /windows_drivers folder. If no communication is initiated by the host machine within a given time, the bootloader will time out and enter the user program, if one is present.įor proper timing, the command line tool should to be started on the host computer before the bootloader is invoked.

In its usual configuration it is invoked at device reset and will identify to the host computer. The bootloader allows uploading of new firmware via USB.

The last release of the V1.x can be found here: The V2.0 upload tool is backwards compatible to the V1.X tool, though.

Many robustness improvements, such as compatibility to USB hubs andĭue to the many changes, also the upload tool had to be updated.

Far jmp also allows using ATtinies with more than 8kb flash.

Interrupt free V-USB: no patching of the user program INT-vector anymore.

Support for the entire ATtiny family instead of only ATtiny85.

The V2.0 release is a complete rewrite of the firmware and offers significant improvements over V1.x: To the authors knowledge this is, by far, the smallest USB bootloader for AVR ATtiny Micronucleus is a bootloader designed for AVR ATtiny microcontrollers with a minimal usb interface, cross platform libusb-based program upload tool, and a strong emphasis on bootloader compactness.

Zadig for windows 10