61 lines
1.9 KiB
ReStructuredText
61 lines
1.9 KiB
ReStructuredText
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.. _xt_wdt_sample:
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Espressif XT WDT Sample
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#######################
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Overview
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********
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This sample shows how to work with XTAL32K Watchdog Timer (XT WDT) peripheral.
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To properly run this sample, you need to have a board with an external 32.728 Hz
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crystal oscillator connected to the XTAL_32K_P and XTAL_32K_N pins.
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The app will ask for the crystal removal to simulate a crystal failure and trigger
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the XT WDT interrupt. Internally the hardware switch the RTC SLOW clock source from
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ESP32_RTC_SLOW_CLK_SRC_XTAL32K to ESP32_RTC_SLOW_CLK_SRC_RC_SLOW (136 KHz for C3 and S3 /
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9 KHz for S2).
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Supported SoCs
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**************
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The following SoCs supports the XT WDT peripheral:
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* ESP32-C3
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* ESP32-S2
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* ESP32-S3
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Building and Running
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********************
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Make sure you have your board connected over USB port and the external crystal is connected
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to pins XTAL_32K_P and XTAL_32K_N.
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.. code-block:: console
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west build -p -b esp32s3_devkitm/esp32s3/procpu samples/boards/esp32/xt_wdt
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west flash
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If using another supported Espressif board, replace the argument in the above
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command with a proper board name (e.g., `esp32s2_saola`).
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Sample Output
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=============
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To check output of this sample, run ``west espressif monitor`` or any other serial
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console program (e.g., minicom, putty, screen, etc).
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This example uses ``west espressif monitor``, which automatically detects the serial
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port at ``/dev/ttyUSB0``:
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.. code-block:: console
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$ west espressif monitor
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.. code-block:: console
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*** Booting Zephyr OS build v3.6.0-3896-gb4a7f061524f ***
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[00:00:01.287,000] <inf> xt_wdt_sample: XT WDT Sample on esp32s3_devkitm/esp32s3/procpu
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[00:00:01.287,000] <inf> xt_wdt_sample: Current RTC SLOW clock rate: 32768 Hz
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[00:00:01.287,000] <inf> xt_wdt_sample: Remove the external 32K crystal to trigger the watchdog
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XT WDT callback
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[00:00:03.554,000] <inf> xt_wdt_sample: Current RTC SLOW clock rate: 136000 Hz
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