52 lines
2 KiB
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52 lines
2 KiB
ReStructuredText
Over The Air Updates (OTA)
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==========================
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OTA Process Overview
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--------------------
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The OTA update mechanism allows a device to update itself based on data received while the normal firmware is running
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(for example, over WiFi or Bluetooth.)
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OTA requires configuring the :doc:`Partition Table <../../api-guides/partition-tables>` of the device with at least two "OTA app slot"
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partitions (ie `ota_0` and `ota_1`) and an "OTA Data Partition".
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The OTA operation functions write a new app firmware image to whichever OTA app slot is not currently being used for
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booting. Once the image is verified, the OTA Data partition is updated to specify that this image should be used for the
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next boot.
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.. _ota_data_partition:
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OTA Data Partition
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------------------
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An OTA data partition (type ``data``, subtype ``ota``) must be included in the :doc:`Partition Table <../../api-guides/partition-tables>`
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of any project which uses the OTA functions.
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For factory boot settings, the OTA data partition should contain no data (all bytes erased to 0xFF). In this case the
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esp-idf software bootloader will boot the factory app if it is present in the the partition table. If no factory app is
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included in the partition table, the first available OTA slot (usually ``ota_0``) is booted.
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After the first OTA update, the OTA data partition is updated to specify which OTA app slot partition should be booted next.
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The OTA data partition is two flash sectors (0x2000 bytes) in size, to prevent problems if there is a power failure
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while it is being written. Sectors are independently erased and written with matching data, and if they disagree a
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counter field is used to determine which sector was written more recently.
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See also
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--------
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* :doc:`Partition Table documentation <../../api-guides/partition-tables>`
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* :doc:`Lower-Level SPI Flash/Partition API <../storage/spi_flash>`
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Application Example
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-------------------
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End-to-end example of OTA firmware update workflow: :example:`system/ota`.
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API Reference
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-------------
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.. include:: /_build/inc/esp_ota_ops.inc
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