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| <h1 id="console">Console</h1> |
| <p>The console is an operating system window where users interact with the OS subsystems or a console |
| application. A user typically inputs text from a keyboard and reads the OS output text on a computer |
| monitor. The text are sent as a sequence of characters between the user and the OS. </p> |
| <p>Support is currently available for console access via the serial port on the hardware board.</p> |
| <h3 id="description">Description</h3> |
| <p>In the Mynewt OS, the console library comes in three versions:</p> |
| <ul> |
| <li>The <code>sys/console/full</code> package implements the complete console functionality and API.</li> |
| <li>The <code>sys/console/stub</code> package implements stubs for the API.</li> |
| <li>The <code>sys/console/minimal</code> package implements minimal console functionality of reading from and writing to console. It implements the <code>console_read()</code> and <code>console_write()</code> functions and stubs for all the other console functions.</li> |
| </ul> |
| <p>All the packages export the <code>console</code> API, and any package that uses the console API must list <code>console</code> as a requirement its <code>pkg.yml</code> file: </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.name: sys/shell |
| pkg.deps: |
| - kernel/os |
| - encoding/base64 |
| - time/datetime |
| - util/crc |
| pkg.req_apis: |
| - console |
| </code></pre></div> |
| |
| <p><br> |
| The project <code>pkg.yml</code> file also specifies the version of the console package to use.</p> |
| <p><br></p> |
| <h4 id="using-the-full-console-package">Using the Full Console Package</h4> |
| <p>A project that requires the full console capability must list the <code>sys/console/full</code> package as a dependency in its <code>pkg.yml</code> file.</p> |
| <p>An example is the <code>slinky</code> application. It requires the full console capability and has the following |
| <code>pkg.yml</code> file: </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.name: apps/slinky |
| pkg.deps: |
| - test/flash_test |
| - mgmt/imgmgr |
| - mgmt/newtmgr |
| - mgmt/newtmgr/transport/nmgr_shell |
| - kernel/os |
| - boot/bootutil |
| - sys/shell |
| - sys/console/full |
| ... |
| - sys/id |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="using-the-stub-console-package">Using the Stub Console Package</h4> |
| <p>A project that uses console stub API must list the <code>sys/console/stub</code> package as a dependency in its <code>pkg.yml</code> file.</p> |
| <p>Examples of when a project would use the console stubs might be:</p> |
| <ul> |
| <li>A project may not have a physical console (e.g. a UART port to connect a terminal to) |
| but may have a dependency on a package that has console capability. </li> |
| <li>A bootloader project where we want to keep the size of the image small. It includes |
| the <code>kernel/os</code> package that can print out messages on a console (e.g. if there is a hard fault). |
| However, we do not want to use any console I/O capability in this particular bootloader project to |
| keep the size small. </li> |
| </ul> |
| <p>The project would use the console stub API and has the following <code>pkg.yml</code> file: </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.name: apps/boot |
| pkg.deps: |
| - boot/bootutil |
| - kernel/os |
| - sys/console/stub |
| </code></pre></div> |
| |
| <p><br></p> |
| <h4 id="using-the-minimal-console-package">Using the Minimal Console Package</h4> |
| <p>There might be projects that need to read and write data on a serial connection but do not need the full console capability. An example might be a project that supports serial image upgrade but does not need full newtmgr capability. The project would use the console minimal API and has the following <code>pkg.yml</code> file: </p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.name: apps/boot |
| pkg.type: app |
| pkg.description: Boot loader application. |
| pkg.author: "Apache Mynewt <dev@mynewt.incubator.apache.org>" |
| pkg.homepage: "http://mynewt.apache.org/" |
| pkg.keywords: |
| - loader |
| |
| pkg.deps: |
| - boot/bootutil |
| - kernel/os |
| - sys/console/stub |
| |
| pkg.deps.BOOT_SERIAL.OVERWRITE: |
| - sys/console/minimal |
| - boot/boot_serial |
| </code></pre></div> |
| |
| <p><br> |
| Console has 2 modes for transmit; <em>blocking mode</em> and <em>non-blocking mode</em>. Usually the <em>non-blocking mode</em> is the |
| active one; the output buffer is drained by getting TX completion interrupts from hardware, and more data is added |
| based on these interrupts.</p> |
| <p><em>Blocking mode</em> is used when we don't want TX completion interrupts. It is used when system crashes, and we still |
| want to output info related to that crash.</p> |
| <p>Console, by default, echoes everything it receives back. Terminal programs expect this, and is a way for the user to |
| know that the console is connected and responsive. Whether echoing happens or not can be controlled programmatically.</p> |
| <p>The Console also has a prompt that is configurable. It is off by default but can be turned on programmatically. The |
| prompt character can also be changed by the user.</p> |
| <h3 id="data-structures">Data structures</h3> |
| <p>N/A</p> |
| <h3 id="list-of-functions">List of Functions</h3> |
| <p>The functions available in console are:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Function</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a href="../console_blocking_mode/">console_blocking_mode</a></td> |
| <td>Calls the <code>console_blocking_tx</code> function to flush the buffered console output (transmit) queue.</td> |
| </tr> |
| <tr> |
| <td><a href="../console_echo/">console_echo</a></td> |
| <td>Controls whether echoing is on or off for the console.</td> |
| </tr> |
| <tr> |
| <td><a href="../console_init/">console_init</a></td> |
| <td>Initialize the console.</td> |
| </tr> |
| <tr> |
| <td><a href="../console_is_init/">console_is_init</a></td> |
| <td>Returns whether console has been initialized or not.</td> |
| </tr> |
| <tr> |
| <td><a href="../console_printf/">console_printf</a></td> |
| <td>Writes a formatted message instead of raw output to the console.</td> |
| </tr> |
| <tr> |
| <td><a href="../console_read/">console_read</a></td> |
| <td>Copies up the to given number of bytes to the input string.</td> |
| </tr> |
| <tr> |
| <td><a href="../console_write/">console_write</a></td> |
| <td>Queues characters to console display over serial port.</td> |
| </tr> |
| </tbody> |
| </table> |
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