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<section id="avr-system-emulator">
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<span id="id1"></span><h1>AVR System emulator<a class="headerlink" href="#avr-system-emulator" title="Link to this heading"></a></h1>
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<p>Use the executable <code class="docutils literal notranslate"><span class="pre">qemu-system-avr</span></code> to emulate a AVR 8 bit based machine.
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These can have one of the following cores: avr1, avr2, avr25, avr3, avr31,
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avr35, avr4, avr5, avr51, avr6, avrtiny, xmega2, xmega3, xmega4, xmega5,
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xmega6 and xmega7.</p>
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<p>As for now it supports few Arduino boards for educational and testing purposes.
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These boards use a ATmega controller, which model is limited to USART & 16-bit
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timer devices, enough to run FreeRTOS based applications (like
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<a class="reference external" href="https://github.com/seharris/qemu-avr-tests/blob/master/free-rtos/Demo/AVR_ATMega2560_GCC/demo.elf">https://github.com/seharris/qemu-avr-tests/blob/master/free-rtos/Demo/AVR_ATMega2560_GCC/demo.elf</a>
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).</p>
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<p>Following are examples of possible usages, assuming demo.elf is compiled for
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AVR cpu</p>
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<ul>
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<li><p>Continuous non interrupted execution:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">avr</span> <span class="o">-</span><span class="n">machine</span> <span class="n">mega2560</span> <span class="o">-</span><span class="n">bios</span> <span class="n">demo</span><span class="o">.</span><span class="n">elf</span>
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</pre></div>
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</div>
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</li>
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<li><p>Continuous non interrupted execution with serial output into telnet window:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">avr</span> <span class="o">-</span><span class="n">M</span> <span class="n">mega2560</span> <span class="o">-</span><span class="n">bios</span> <span class="n">demo</span><span class="o">.</span><span class="n">elf</span> <span class="o">-</span><span class="n">nographic</span> \
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<span class="o">-</span><span class="n">serial</span> <span class="n">tcp</span><span class="p">::</span><span class="mi">5678</span><span class="p">,</span><span class="n">server</span><span class="o">=</span><span class="n">on</span><span class="p">,</span><span class="n">wait</span><span class="o">=</span><span class="n">off</span>
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</pre></div>
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</div>
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<p>and then in another shell:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">telnet</span> <span class="n">localhost</span> <span class="mi">5678</span>
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</pre></div>
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</div>
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</li>
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<li><p>Debugging with GDB debugger:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">avr</span> <span class="o">-</span><span class="n">machine</span> <span class="n">mega2560</span> <span class="o">-</span><span class="n">bios</span> <span class="n">demo</span><span class="o">.</span><span class="n">elf</span> <span class="o">-</span><span class="n">s</span> <span class="o">-</span><span class="n">S</span>
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</pre></div>
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</div>
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<p>and then in another shell:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">avr</span><span class="o">-</span><span class="n">gdb</span> <span class="n">demo</span><span class="o">.</span><span class="n">elf</span>
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</pre></div>
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</div>
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<p>and then within GDB shell:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">target</span> <span class="n">remote</span> <span class="p">:</span><span class="mi">1234</span>
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</pre></div>
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</div>
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</li>
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<li><p>Print out executed instructions (that have not been translated by the JIT
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compiler yet):</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">avr</span> <span class="o">-</span><span class="n">machine</span> <span class="n">mega2560</span> <span class="o">-</span><span class="n">bios</span> <span class="n">demo</span><span class="o">.</span><span class="n">elf</span> <span class="o">-</span><span class="n">d</span> <span class="n">in_asm</span>
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</pre></div>
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</div>
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