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| <h4>Latest News:</h4> <a href="/download">Apache Mynewt 1.12.0, Apache NimBLE 1.7.0 </a> released (April 4, 2024) |
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| <h2 id="flash"><font color="#F2853F" style="font-size:24pt">flash</font></h2> |
| <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>MTD</code> for <code>Memory Technology Devices</code>.</p> |
| <p>At the moment the only <code>flash</code> device that is already supported is the |
| AT45DBxxx SPI flash family with the <code>at45db</code> driver.</p> |
| <p>The flash driver aims for full compatibility with the <code>hal_flash</code> API, |
| which means initialization and usage can be performed by any <code>fs</code> that |
| supports the <code>hal_flash</code> interface.</p> |
| <h4 id="initialization">Initialization</h4> |
| <p>To be compatible with the standard <code>hal_flash</code> interface, the <code>at45db</code> driver |
| embeds a <code>struct hal_flash</code> to its own <code>struct at45db_dev</code>. The whole <code>at45db_dev</code> |
| struct is shown below.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">struct</span> <span style="color: #3F6E75">at45db_dev</span> { |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">hal</span>; |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_spi_settings</span> <span style="color: #000000">*settings</span>; |
| <span style="color: #A90D91">int</span> <span style="color: #000000">spi_num</span>; |
| <span style="color: #A90D91">void</span> <span style="color: #000000">*spi_cfg</span>; <span style="color: #177500">/** Low-level MCU SPI config */</span> |
| <span style="color: #A90D91">int</span> <span style="color: #000000">ss_pin</span>; |
| <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">baudrate</span>; |
| <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">page_size</span>; <span style="color: #177500">/** Page size to be used, valid: 512 and 528 */</span> |
| <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">disable_auto_erase</span>; <span style="color: #177500">/** Reads and writes auto-erase by default */</span> |
| }; |
| </code></pre></div> |
| |
| <p>To ease with initialization a helper function <code>at45db_default_config</code> was added. |
| It returns an already initialized <code>struct at45db_dev</code> leaving the user with just |
| having to provide the SPI related config.</p> |
| <p>To initialize the device, pass the <code>at45db_dev</code> struct to <code>at45db_init</code>.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> <span style="color: #000000">at45db_init</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*dev</span>); |
| </code></pre></div> |
| |
| <p>For low-level access to the device the following functions are provided:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> <span style="color: #000000">at45db_read</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*dev</span>, <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">addr</span>, <span style="color: #A90D91">void</span> <span style="color: #000000">*buf</span>, |
| <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">len</span>); |
| <span style="color: #A90D91">int</span> <span style="color: #000000">at45db_write</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*dev</span>, <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">addr</span>, <span style="color: #A90D91">const</span> <span style="color: #A90D91">void</span> <span style="color: #000000">*buf</span>, |
| <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">len</span>); |
| <span style="color: #A90D91">int</span> <span style="color: #000000">at45db_erase_sector</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*dev</span>, <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">sector_address</span>); |
| <span style="color: #A90D91">int</span> <span style="color: #000000">at45db_sector_info</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*dev</span>, <span style="color: #A90D91">int</span> <span style="color: #000000">idx</span>, <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">*address</span>, |
| <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">*sz</span>); |
| </code></pre></div> |
| |
| <p>Also, <code>nffs</code> is able to run on the device due to the fact that standard <code>hal_flash</code> |
| interface compatibility is provided. Due to current limitations of <code>nffs</code>, it can |
| only run on <code>at45db</code> if the internal flash of the MCU is not being used.</p> |
| <h4 id="dependencies">Dependencies</h4> |
| <p>To include the <code>at45db</code> driver on a project, just include it as a dependency in your |
| pkg.yml:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.deps: |
| - hw/drivers/flash/at45db |
| </code></pre></div> |
| |
| <h4 id="header-file">Header file</h4> |
| <p>The <code>at45db</code> SPI flash follows the standard <code>hal_flash</code> interface but requires |
| that a special struct </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #633820">#include</span> <span style="color: #177500"><at45db/at45db.h></span> |
| </code></pre></div> |
| |
| <h4 id="example">Example</h4> |
| <p>This following examples assume that the <code>at45db</code> is being used on a STM32F4 MCU.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #A90D91">int</span> <span style="color: #000000">SPI_SS_PIN</span> <span style="color: #000000">=</span> <span style="color: #000000">MCU_GPIO_PORTA</span>(<span style="color: #1C01CE">4</span>); |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #A90D91">int</span> <span style="color: #000000">SPI_SCK_PIN</span> <span style="color: #000000">=</span> <span style="color: #000000">MCU_GPIO_PORTA</span>(<span style="color: #1C01CE">5</span>); |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #A90D91">int</span> <span style="color: #000000">SPI_MISO_PIN</span> <span style="color: #000000">=</span> <span style="color: #000000">MCU_GPIO_PORTA</span>(<span style="color: #1C01CE">6</span>); |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #A90D91">int</span> <span style="color: #000000">SPI_MOSI_PIN</span> <span style="color: #000000">=</span> <span style="color: #000000">MCU_GPIO_PORTA</span>(<span style="color: #1C01CE">7</span>); |
| |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">stm32f4_hal_spi_cfg</span> <span style="color: #000000">spi_cfg</span> <span style="color: #000000">=</span> { |
| .<span style="color: #000000">ss_pin</span> <span style="color: #000000">=</span> <span style="color: #000000">SPI_SS_PIN</span>, |
| .<span style="color: #000000">sck_pin</span> <span style="color: #000000">=</span> <span style="color: #000000">SPI_SCK_PIN</span>, |
| .<span style="color: #000000">miso_pin</span> <span style="color: #000000">=</span> <span style="color: #000000">SPI_MISO_PIN</span>, |
| .<span style="color: #000000">mosi_pin</span> <span style="color: #000000">=</span> <span style="color: #000000">SPI_MOSI_PIN</span>, |
| .<span style="color: #000000">irq_prio</span> <span style="color: #000000">=</span> <span style="color: #1C01CE">2</span> |
| }; |
| |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">at45db_dev</span> <span style="color: #000000">*my_at45db_dev</span> <span style="color: #000000">=</span> <span style="color: #A90D91">NULL</span>; |
| |
| <span style="color: #000000">my_at45db_dev</span> <span style="color: #000000">=</span> <span style="color: #000000">at45db_default_config</span>(); |
| <span style="color: #000000">my_at45db_dev->spi_num</span> <span style="color: #000000">=</span> <span style="color: #1C01CE">0</span>; |
| <span style="color: #000000">my_at45db_dev->spi_cfg</span> <span style="color: #000000">=</span> <span style="color: #000000">&spi_cfg</span>; |
| <span style="color: #000000">my_at45db_dev->ss_pin</span> <span style="color: #000000">=</span> <span style="color: #000000">spi_cfg</span>.<span style="color: #000000">ss_pin</span>; |
| |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">at45db_init</span>((<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*</span>) <span style="color: #000000">my_at45db_dev</span>); |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span>) { |
| <span style="color: #177500">/* XXX: error handling */</span> |
| } |
| </code></pre></div> |
| |
| <p>The enable <code>nffs</code> to run on the <code>at45db</code>, the <code>flash_id</code> 0 needs to map to |
| provide a mapping from 0 to this struct.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">hal_flash</span> <span style="color: #000000">*</span> |
| <span style="color: #000000">hal_bsp_flash_dev</span>(<span style="color: #A90D91">uint8_t</span> <span style="color: #000000">id</span>) |
| { |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">id</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) { |
| <span style="color: #A90D91">return</span> <span style="color: #A90D91">NULL</span>; |
| } |
| <span style="color: #A90D91">return</span> <span style="color: #000000">&my_at45db_dev</span>; |
| } |
| </code></pre></div> |
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