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| <li class="toctree-l3 current"><a class="current reference internal" href="#">STM32WL5</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="#supported-mcus">Supported MCUs</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="#peripheral-support">Peripheral Support</a><ul> |
| <li class="toctree-l5"><a class="reference internal" href="#pll">PLL</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#lse">LSE</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#hsi">HSI</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#msi">MSI</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#hse">HSE</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#rcc">RCC</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#syscfg">SYSCFG</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#gpio">GPIO</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#uart">UART</a></li> |
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| <li class="toctree-l5"><a class="reference internal" href="#exti">EXTI</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="#flash">FLASH</a></li> |
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| |
| <section id="stm32wl5"> |
| <h1>STM32WL5<a class="headerlink" href="#stm32wl5" title="Permalink to this headline"></a></h1> |
| <p>The STM32WL5 is a dual CPU (not core!) chip based on ARM Cortex-M4 and |
| Cortex-M0 with integrated sub-GHz radio for LoRa (G)FSK, (G)MSK and BPSK |
| modulations.</p> |
| <p>Only Cortex-M0 has access to radio peripheral. Pipe between CPUs exists |
| so that radio packets can be exchanged between CPUs. Chip was designed |
| so that Cortex-M0 cpu handles radio traffic while Cortex-M4 cpu handles |
| actions based on traffic received. All other peripherals are shared |
| (like uart, spi, i2c) and both CPUs can initiate them, but it’s required |
| to be done only by one of them.</p> |
| <section id="supported-mcus"> |
| <h2>Supported MCUs<a class="headerlink" href="#supported-mcus" title="Permalink to this headline"></a></h2> |
| <p>STM32WL5 has only two chips in family. STM32WL55 and STM32WL54. Only |
| difference between them is that STM32WL55 has support for LoRa while |
| Stm32WL54 does not.</p> |
| </section> |
| <section id="peripheral-support"> |
| <h2>Peripheral Support<a class="headerlink" href="#peripheral-support" title="Permalink to this headline"></a></h2> |
| <p>The following list indicates peripherals supported in NuttX:</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 12%" /> |
| <col style="width: 8%" /> |
| <col style="width: 80%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Peripheral</p></th> |
| <th class="head"><p>Support</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>IRQs</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>GPIO</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>EXTI</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>HSE</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>PLL</p></td> |
| <td><p>Yes</p></td> |
| <td><p>Tested @ 48MHz</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>HSI</p></td> |
| <td><p>Yes</p></td> |
| <td><p>Not tested</p></td> |
| </tr> |
| <tr class="row-even"><td><p>MSI</p></td> |
| <td><p>Yes</p></td> |
| <td><p>Not tested</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>LSE</p></td> |
| <td><p>Yes</p></td> |
| <td><p>Not tested</p></td> |
| </tr> |
| <tr class="row-even"><td><p>RCC</p></td> |
| <td><p>Yes</p></td> |
| <td><p>All registers defined, not all peripherals enabled</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>SYSCFG</p></td> |
| <td><p>Yes</p></td> |
| <td><p>All registers defined, GPIO EXTI works, remapping not tested</p></td> |
| </tr> |
| <tr class="row-even"><td><p>USART</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>LPUART</p></td> |
| <td><p>Yes</p></td> |
| <td><p>full speed with HSE works, low power mode with LSE not implemented</p></td> |
| </tr> |
| <tr class="row-even"><td><p>FLASH</p></td> |
| <td><p>Yes</p></td> |
| <td><p>Progmem implementation - mtd filesystems like smartfs or nxffs work</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>DMA</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>SRAM2</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>SPI</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>I2C</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>RTC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>Timers</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>PM</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>AES</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>RNG</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>CRC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>WWDG</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>IWDG</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>ADC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>DAC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>IPCC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p><a class="reference external" href="mailto:Radio%40CPU0">Radio<span>@</span>CPU0</a></p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <section id="pll"> |
| <h3>PLL<a class="headerlink" href="#pll" title="Permalink to this headline"></a></h3> |
| <p>PLL is a module that allows MCU to generate higher (or lower) clocks than |
| provided by the source. For example it can be used to drive system clock |
| with 48MHz when 8MHz HSE crystal is installed.</p> |
| </section> |
| <section id="lse"> |
| <h3>LSE<a class="headerlink" href="#lse" title="Permalink to this headline"></a></h3> |
| <p>Low speed external crystal. Can be used to clock RTC and/or independent |
| watchdog (IWDG). LSE is usually 32768Hz high precision crystal.</p> |
| </section> |
| <section id="hsi"> |
| <h3>HSI<a class="headerlink" href="#hsi" title="Permalink to this headline"></a></h3> |
| <p>High speed internal clock. Can be used as a source for sysclk and |
| internal buses (APB, AHB). This clock source is not as precise or |
| as stable as HSE, but it cuts down costs by avoiding external |
| hardware (crystal and capacitors) and is usually good enough if |
| operating temperatures are stable. It’s clock is fixed at 16MHz.</p> |
| </section> |
| <section id="msi"> |
| <h3>MSI<a class="headerlink" href="#msi" title="Permalink to this headline"></a></h3> |
| <p>Adjustable internal clock. Can be adjusted by software, but it’s |
| accuracy and stability is even lower than HSI.</p> |
| </section> |
| <section id="hse"> |
| <h3>HSE<a class="headerlink" href="#hse" title="Permalink to this headline"></a></h3> |
| <p>High speed external crystal. Can be used to clock sysclk and internal |
| buses (APB, AHB). External crystal is more precise and more stable |
| than HSI.</p> |
| </section> |
| <section id="rcc"> |
| <h3>RCC<a class="headerlink" href="#rcc" title="Permalink to this headline"></a></h3> |
| <p>Reset and clock control. Enables or disables specific peripherals.</p> |
| </section> |
| <section id="syscfg"> |
| <h3>SYSCFG<a class="headerlink" href="#syscfg" title="Permalink to this headline"></a></h3> |
| <p>System configuration controller. Can be used to remap memory or |
| manage GPIO multiplexer for EXTI.</p> |
| </section> |
| <section id="gpio"> |
| <h3>GPIO<a class="headerlink" href="#gpio" title="Permalink to this headline"></a></h3> |
| <p>Pins can be configured using <code class="xref c c-func docutils literal notranslate"><span class="pre">stm32wl5_configgpio()</span></code> function. Writing |
| to pins is done by <code class="xref c c-func docutils literal notranslate"><span class="pre">stm32wl5_gpiowrite()</span></code> function and reading is done |
| by <code class="xref c c-func docutils literal notranslate"><span class="pre">stm32wl5_gpioread()</span></code>.</p> |
| </section> |
| <section id="uart"> |
| <h3>UART<a class="headerlink" href="#uart" title="Permalink to this headline"></a></h3> |
| <p>Universal Asynchronous Receiver/Transmitter module. UART is initialized |
| automatically during MCU boot.</p> |
| </section> |
| <section id="ipcc"> |
| <h3>IPCC<a class="headerlink" href="#ipcc" title="Permalink to this headline"></a></h3> |
| <p>Inter-processor communication controller. IPCC is used to exchange data |
| between Cortex-M4 and Cortex-M0 CPUs.</p> |
| </section> |
| <section id="exti"> |
| <h3>EXTI<a class="headerlink" href="#exti" title="Permalink to this headline"></a></h3> |
| <p>Extended interrupts and event controller. Extends interrupts not provided |
| by NVIC. For example, there is only one interrupt for GPIO5..9 in NVIC, |
| but thanks to EXTI we can differentiate which GPIO caused interrupt. Such |
| interrupt first goes through EXTI and is then forwarded to main NVIC.</p> |
| <p>EXTI for gpio can be enabled via <cite>stm32wl5_gpiosetevent</cite> function.</p> |
| </section> |
| <section id="flash"> |
| <h3>FLASH<a class="headerlink" href="#flash" title="Permalink to this headline"></a></h3> |
| <p>Place where program code lives. Part of flash can also be used to create |
| small filesystems like nxffs or smartfs to hold persistent data between |
| reboots without the need of attaching external flash or mmc card. Since |
| flash has limited number of erases (writes) it’s best to hold there only |
| data that is no frequently updated (so, configuration is ok, logs are not).</p> |
| </section> |
| </section> |
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| <h2>Supported Boards<a class="headerlink" href="#supported-boards" title="Permalink to this headline"></a></h2> |
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