![]() ![]() ![]() Breaking down the above command the -p option specifies the type of AVR we are programming, the -c specifies the type of programmer, the -P specifies the way the programmer is connected to the computer and the -U specifies the operation to be performed. To test that everything is working correctly lets read the device signature bytes using the following command.Īvrdude -p at90usb162 -c avrisp2 -P usb -U signature:r:signature.txt:hĪvrdude sometimes takes a moment to complete when it does the result of the above command should be a text file, "signature.txt", containing three hexadecimal values corresponding to the signature bytes of your AVR chip. Next we'll untar, configure, and compile as follows. At the time of writing the latest version is 5.10. First you will need to get the source code for avrdude. There are a couple pieces of software that will drive the mkII in Linux we'll be using AVRDude for this tutorial. Now that we have the hardware hooked up it's time to setup the software to drive the mkII. The mkII will *not* supply power to your AVR and if you don't power it separately programming the device will fail. You will also need a second USB cable or 9v power supply to power your development board. Once you have your mkII, Adapter, and board attach the mkII to the board and then to your computer via a USB cable. If you have a board, like our AT90USB162 board, with a 2x5 header you will need to buy an adapter to connect the 2x3 connector on the mkII with your board. There are two types of ISP header commonly used on AVR boards, 2x3 and 2x5. There are a huge variety of programmers that support AVR microcontrollers for purposes of this tutorial we will discuss Atmel's AVR ISP mkII programmer. In order to read and write these bytes you need to use an In Circuit Programmer or "ISP" for short. AVR microcontrollers in addition to having flash memory (where your program is stored) and EEPROM (where your data is stored) also have between one and four configuration bytes as well as a three device signature bytes. Loading code via USB is convenient, on the other hand there are a number of things that can't be done via USB and the dfu-programmer software. So far in our tutorials on setting up and programming the AT90USB162 development board we've taken advantage of the built-in loader via USB and dfu-programmer. ![]()
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