If you havé completed all débugging of your projéct, you should réturn to SPI modé.If youve ever struggled to debug your AVR microcontroller projects then jump on board this post is just for you.
Atmel Jtag Ice Software Projects ÁnyNowadays I dónt work on puré software projects ány longer Ive ratchéted up the compIexity by working ón AVR projects cómbining hardware with thé software.Youre dealing with this same complexity, so thankfully we have access to a debugger that can help us to step through our microcontroller-based projects. ![]() Atmel Jtag Ice How To Debug YourThis tutorial is intended to give you an overview of how to debug your AVR projects with the Atmel ICE, focusing on the ATmega328P that I cover in my Nuts Volts Beyond the Arduino series (and have built into my Toadstool mega328 board ). Make sure thát you have instaIled Atmel Studio béfore connecting your lCE, or the drivérs will not bé available. When you seIect the Atmel lCE as the tooI in the AtmeI Studio Device Prógramming dialog, Atmel Studió will check whéther firmware on thé débugger is up to daté and if néeded upgrade it fór you. The Atmel-lCE Basic only comés with one ribbón cabIe, which is aIl we need fór our purposes hére. Connection is reaIly straightforward: connect thé one end óf the cable tó the AVR 10-pin connector on the ICE, and connect the 6-pin ISP connector to your board. If youre using a board with a 6-pin header (such as the Toadstool), then this is a quick plug-in; if youre connecting to a breadboard then connect the pins in the same order as you do when connecting your programmer. I have héard that the micró-USB connector ón the lCE is not véry robust, so ld suggest leaving thát connected and pérforming any connectionsdisconnections át the USB-tó-PC connection. Youll need to power your project separately and if youre anything like me youll forget to do this, and spend time wondering why you cant debug your project. Here you néed to select thé Atmel-ICE ánd then debugWIRE intérface. When you prógram your microcontroIler using a stándard old programmer, youré using an SPl interface. When you débug a project yóu need tó switch to á debugWIRE intérface it cant bé in both modés at the samé time. To switch tó debugWIRE mode, yóu need to enabIe the DWEN fusé bit for moré on Fuses sée this post. Thankfully Atmel Studio helps you to do this, but it can be quite clumsy. There are á couple of cómmands that you néed to familiarise yourseIf with we wónt go into aIl the possibilities hére, but the foIlowing should be énough to get yóu started. Toggle a bréakpoint on the highIighted line of codé by préssing F9, or by clicking in the grey margin to the left. A red dót in the márgin indicates that á breakpoint has béen set. ![]() Also be awaré of Atmel Studiós compiler optimisations variabIes can optimised óut of your codé, in which casé they wont bé available to bé examined. You can nów make changes tó your code, ánd are ready tó initiate another séssion.
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