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| <div class="section" id="pin-wheel-modifications-to-blinky-on-stm32f3-discovery"> |
| <h1>Pin Wheel Modifications to “Blinky” on STM32F3 Discovery<a class="headerlink" href="#pin-wheel-modifications-to-blinky-on-stm32f3-discovery" title="Permalink to this headline">¶</a></h1> |
| <div class="section" id="objective"> |
| <h2>Objective<a class="headerlink" href="#objective" title="Permalink to this headline">¶</a></h2> |
| <p>Learn how to modify an existing app – the <a class="reference external" href="STM32F303.html">blinky</a> app |
| – to light all the LEDs on the STM32F3 Discovery board.</p> |
| </div> |
| <div class="section" id="what-you-need"> |
| <h2>What you need<a class="headerlink" href="#what-you-need" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><p>Discovery kit with STM32F303VC MCU</p></li> |
| <li><p>Laptop running Mac OSX.</p></li> |
| <li><p>It is assumed you have already installed and run the |
| <a class="reference external" href="STM32F303.html">blinky</a> app succesfully.</p></li> |
| </ul> |
| <p>Since you’ve already successfully created your blinky app project, |
| you’ll need to modify only one file, main.c, in order to get this app |
| working.</p> |
| <p>The main.c file resides in the apps/blinky/src directory in your project |
| folder so you can edit it with your favorite editor. You’ll make the |
| following changes:</p> |
| <p>Replace the line:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="n">g_led_pin</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>With the line:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="n">g_led_pins</span><span class="p">[</span><span class="mi">8</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="n">LED_BLINK_PIN_1</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_2</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_3</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_4</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_5</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_6</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_7</span><span class="p">,</span><span class="w"> </span><span class="n">LED_BLINK_PIN_8</span><span class="p">};</span> |
| </pre></div> |
| </div> |
| <p>So that you now have an array of all 8 LED Pins on the board.</p> |
| <p>Delete the line:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">g_led_pin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">LED_BLINK_PIN</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>And in its place, add the following lines to initialize all the |
| LED_PINS correctly:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="p">;</span> |
| <span class="k">for</span><span class="p">(</span><span class="n">x</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">8</span><span class="p">;</span><span class="w"> </span><span class="n">x</span><span class="o">++</span><span class="p">){</span> |
| <span class="w"> </span><span class="n">hal_gpio_init_out</span><span class="p">(</span><span class="n">g_led_pins</span><span class="p">[</span><span class="n">x</span><span class="p">],</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span> |
| <span class="p">}</span> |
| <span class="kt">int</span><span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>We’ll use that ‘p’ later. Next you’ll want to change the line:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">os_time_delay</span><span class="p">(</span><span class="mi">1000</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>to a shorter time in order to make it a little more interesting. A full |
| 1 second delay doesn’t look great, so try 100 for starters and then you |
| can adjust it to your liking.</p> |
| <p>Finally, change the line:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">hal_gpio_toggle</span><span class="p">(</span><span class="n">g_led_pin</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>to look like this:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">hal_gpio_toggle</span><span class="p">(</span><span class="n">g_led_pins</span><span class="p">[</span><span class="n">p</span><span class="o">++</span><span class="p">]);</span> |
| <span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">p</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">7</span><span class="p">)</span><span class="w"> </span><span class="o">?</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">p</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="build-the-target-and-executables-and-download-the-images"> |
| <h2>Build the target and executables and download the images<a class="headerlink" href="#build-the-target-and-executables-and-download-the-images" title="Permalink to this headline">¶</a></h2> |
| <p>Run the same commands you used on the blinky app to build and load this |
| one:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>newt<span class="w"> </span>create-image<span class="w"> </span>stmf3_blinky<span class="w"> </span><span class="m">1</span>.2.3 |
| <span class="go">App image successfully generated: ~/dev/myproj/bin/stmf3_blinky/apps/blinky/blinky.img</span> |
| <span class="go">Build manifest:~/dev/myproj/bin/stmf3_blinky/apps/blinky/manifest.json</span> |
| <span class="gp">$ </span>newt<span class="w"> </span>-v<span class="w"> </span>load<span class="w"> </span>stmf3_boot |
| <span class="gp">$ </span>newt<span class="w"> </span>-v<span class="w"> </span>load<span class="w"> </span>stmf3_blinky |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="watch-the-leds-go-round-and-round"> |
| <h2>Watch the LEDs go round and round<a class="headerlink" href="#watch-the-leds-go-round-and-round" title="Permalink to this headline">¶</a></h2> |
| <p>The colored LEDs should now all light up in succession, and once they’re |
| all lit, they should then go off in the same order. This should repeat |
| continuously.</p> |
| <p>If you see anything missing or want to send us feedback, please do so by |
| signing up for appropriate mailing lists on our <a class="reference external" href="../../community.html">Community |
| Page</a>.</p> |
| <p>Keep on hacking and blinking!</p> |
| </div> |
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