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| <div class="section" id="flash"> |
| <h1>flash<a class="headerlink" href="#flash" title="Permalink to this headline">¶</a></h1> |
| <p>The flash driver subsystem is a work in progress which aims at |
| supporting common external SPI/I2C flash/eeprom memory chips. This is |
| equivalent to what Linux calls <code class="docutils literal notranslate"><span class="pre">MTD</span></code> for |
| <code class="docutils literal notranslate"><span class="pre">Memory</span> <span class="pre">Technology</span> <span class="pre">Devices</span></code>.</p> |
| <p>At the moment the only <code class="docutils literal notranslate"><span class="pre">flash</span></code> device that is already supported is the |
| AT45DBxxx SPI flash family with the <code class="docutils literal notranslate"><span class="pre">at45db</span></code> driver.</p> |
| <p>The flash driver aims for full compatibility with the <code class="docutils literal notranslate"><span class="pre">hal_flash</span></code> API, |
| which means initialization and usage can be performed by any <code class="docutils literal notranslate"><span class="pre">fs</span></code> that |
| supports the <code class="docutils literal notranslate"><span class="pre">hal_flash</span></code> interface.</p> |
| <div class="section" id="initialization"> |
| <h2>Initialization<a class="headerlink" href="#initialization" title="Permalink to this headline">¶</a></h2> |
| <p>To be compatible with the standard <code class="docutils literal notranslate"><span class="pre">hal_flash</span></code> interface, the |
| <code class="docutils literal notranslate"><span class="pre">at45db</span></code> driver embeds a <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">hal_flash</span></code> to its own |
| <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">at45db_dev</span></code>. The whole <code class="docutils literal notranslate"><span class="pre">at45db_dev</span></code> struct is shown below.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">at45db_dev</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="n">hal</span><span class="p">;</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_spi_settings</span><span class="w"> </span><span class="o">*</span><span class="n">settings</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">spi_num</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">spi_cfg</span><span class="p">;</span><span class="w"> </span><span class="cm">/** Low-level MCU SPI config */</span> |
| <span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">ss_pin</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">baudrate</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">uint16_t</span><span class="w"> </span><span class="n">page_size</span><span class="p">;</span><span class="w"> </span><span class="cm">/** Page size to be used, valid: 512 and 528 */</span> |
| <span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">disable_auto_erase</span><span class="p">;</span><span class="w"> </span><span class="cm">/** Reads and writes auto-erase by default */</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| <p>To ease with initialization a helper function <code class="docutils literal notranslate"><span class="pre">at45db_default_config</span></code> |
| was added. It returns an already initialized <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">at45db_dev</span></code> |
| leaving the user with just having to provide the SPI related config.</p> |
| <p>To initialize the device, pass the <code class="docutils literal notranslate"><span class="pre">at45db_dev</span></code> struct to |
| <code class="docutils literal notranslate"><span class="pre">at45db_init</span></code>.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="nf">at45db_init</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span><span class="n">dev</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>For low-level access to the device the following functions are provided:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="nf">at45db_read</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span><span class="n">dev</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">addr</span><span class="p">,</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">buf</span><span class="p">,</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">len</span><span class="p">);</span> |
| <span class="kt">int</span><span class="w"> </span><span class="nf">at45db_write</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span><span class="n">dev</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">addr</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">buf</span><span class="p">,</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">len</span><span class="p">);</span> |
| <span class="kt">int</span><span class="w"> </span><span class="nf">at45db_erase_sector</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span><span class="n">dev</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">sector_address</span><span class="p">);</span> |
| <span class="kt">int</span><span class="w"> </span><span class="nf">at45db_sector_info</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span><span class="n">dev</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">idx</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="o">*</span><span class="n">address</span><span class="p">,</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="o">*</span><span class="n">sz</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>Also, <code class="docutils literal notranslate"><span class="pre">nffs</span></code> is able to run on the device due to the fact that |
| standard <code class="docutils literal notranslate"><span class="pre">hal_flash</span></code> interface compatibility is provided. Due to |
| current limitations of <code class="docutils literal notranslate"><span class="pre">nffs</span></code>, it can only run on <code class="docutils literal notranslate"><span class="pre">at45db</span></code> if the |
| internal flash of the MCU is not being used.</p> |
| </div> |
| <div class="section" id="dependencies"> |
| <h2>Dependencies<a class="headerlink" href="#dependencies" title="Permalink to this headline">¶</a></h2> |
| <p>To include the <code class="docutils literal notranslate"><span class="pre">at45db</span></code> driver on a project, just include it as a |
| dependency in your pkg.yml:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>pkg.deps: |
| - "@apache-mynewt-core/hw/drivers/flash/at45db" |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="header-file"> |
| <h2>Header file<a class="headerlink" href="#header-file" title="Permalink to this headline">¶</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">at45db</span></code> SPI flash follows the standard <code class="docutils literal notranslate"><span class="pre">hal_flash</span></code> interface |
| but requires that a special struct</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><at45db/at45db.h></span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example"> |
| <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> |
| <p>This following examples assume that the <code class="docutils literal notranslate"><span class="pre">at45db</span></code> is being used on a |
| STM32F4 MCU.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">SPI_SS_PIN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">MCU_GPIO_PORTA</span><span class="p">(</span><span class="mi">4</span><span class="p">);</span> |
| <span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">SPI_SCK_PIN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">MCU_GPIO_PORTA</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span> |
| <span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">SPI_MISO_PIN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">MCU_GPIO_PORTA</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span> |
| <span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">SPI_MOSI_PIN</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">MCU_GPIO_PORTA</span><span class="p">(</span><span class="mi">7</span><span class="p">);</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">stm32f4_hal_spi_cfg</span><span class="w"> </span><span class="n">spi_cfg</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">ss_pin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SPI_SS_PIN</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">sck_pin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SPI_SCK_PIN</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">miso_pin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SPI_MISO_PIN</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">mosi_pin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SPI_MOSI_PIN</span><span class="p">,</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">irq_prio</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">2</span> |
| <span class="p">};</span> |
| |
| <span class="k">struct</span><span class="w"> </span><span class="nc">at45db_dev</span><span class="w"> </span><span class="o">*</span><span class="n">my_at45db_dev</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">NULL</span><span class="p">;</span> |
| |
| <span class="n">my_at45db_dev</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">at45db_default_config</span><span class="p">();</span> |
| <span class="n">my_at45db_dev</span><span class="o">-></span><span class="n">spi_num</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> |
| <span class="n">my_at45db_dev</span><span class="o">-></span><span class="n">spi_cfg</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">&</span><span class="n">spi_cfg</span><span class="p">;</span> |
| <span class="n">my_at45db_dev</span><span class="o">-></span><span class="n">ss_pin</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">spi_cfg</span><span class="p">.</span><span class="n">ss_pin</span><span class="p">;</span> |
| |
| <span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">at45db_init</span><span class="p">((</span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="w"> </span><span class="n">my_at45db_dev</span><span class="p">);</span> |
| <span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* XXX: error handling */</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>The enable <code class="docutils literal notranslate"><span class="pre">nffs</span></code> to run on the <code class="docutils literal notranslate"><span class="pre">at45db</span></code>, the <code class="docutils literal notranslate"><span class="pre">flash_id</span></code> 0 needs |
| to map to provide a mapping from 0 to this struct.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">const</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hal_flash</span><span class="w"> </span><span class="o">*</span> |
| <span class="n">hal_bsp_flash_dev</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">id</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">id</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="p">{</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nb">NULL</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="o">&</span><span class="n">my_at45db_dev</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
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