Avrdude is a program that is used to update or read the flash and EEPROM memories of Atmel AVR microcontrollers on FreeBSD Unix. It supports the Atmel serial programming protocol using the PC's parallel port and can upload either a raw binary file or an Intel Hex format file.
For more technical users, rather than using the Arduino IDE, they may want to program the Trinket directly with AVR-GCC as the compiler, vi/emacs as their editor and AVRdude as the uploader. That's easy to do! Target the Attiny85 as the chip used in avr-gcc, with F_CPU at 8MHz using the internal oscillator. To use avrdude a minor change must be made to to avrdude.conf. To figure out where the avrdude.conf is, open up a command window (windows: cmd, mac: Terminal, linux: rxvt etc) and type in avrdude -v. Programming in a Blink example For more details on using avdude and avr-gcc, you'll need to read a detailed tutorial or book on those subjects.
However, you can do a basic test by uploading the following HEX file, which will blink the #1 LED once a second on and off. (Its a bit chunky as blink.hex's go as it has all the Arduino IDE stuff in there too.
![Avrdude Programming Software Avrdude Programming Software](https://blog.junaid.site/images/electronics/eclipse-avr/eclipse-avr-avrdude-programmer-configuration.png)
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If you wrote it in straight-C it would be like 100 bytes) - if you want to see the source code for this, it's basically the Arduino file->examples->basics->blink demo with 1 as the LED pin. And uploading it with the command avrdude -c usbtiny -p attiny85 -U flash:w:trinketblink.hex or, if that's giving errors, avrdude -c usbtiny -p attiny85 -D -U flash:w:trinketblink.hex (note the extra -D) As before, type out the command, then press the reset button to start the bootloader and once the red LED is pulsing, hit return When uploading, you will see a lot of avrdude: 8 retries during SPI command and similar warnings. Because of the way the ATtiny85 works, there's a small delay when writing the new program to flash, and during that delay, it cannot save the data and also send USB data at the same time. This causes the USB reply to avrdude to be delayed and avrdude to spit out the retry alert. You have been successfully subscribed to the Notification List for this product and will therefore receive an e-mail from us when it is back in stock! For security reasons, an e-mail has been sent to you acknowledging your subscription.
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