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spi_flash: added programming guide for ESP-IDF vs ESP-ROM flash driver

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Armando
2023-03-03 15:23:32 +08:00
parent d35b6dd852
commit 75629ee6a8
6 changed files with 75 additions and 1 deletions
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docs/en/api-guides/performance/ram-usage.rst
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@@ -134,7 +134,7 @@ The following options will reduce IRAM usage of some ESP-IDF features:
- Enable :ref:`CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH`. Provided these functions are not (incorrectly) used from ISRs, this option is safe to enable in all configurations.
- Enable :ref:`CONFIG_RINGBUF_PLACE_ISR_FUNCTIONS_INTO_FLASH`. This option is not safe to use if the ISR ringbuf functions are used from an IRAM interrupt context, e.g. if :ref:`CONFIG_UART_ISR_IN_IRAM` is enabled. For the IDF drivers where this is the case you will get an error at run-time when installing the driver in question.
:SOC_WIFI_SUPPORTED: - Disable Wi-Fi options :ref:`CONFIG_ESP_WIFI_IRAM_OPT` and/or :ref:`CONFIG_ESP_WIFI_RX_IRAM_OPT`. Disabling these options will free available IRAM at the cost of Wi-Fi performance.
:esp32c3 or esp32s3: - :ref:`CONFIG_SPI_FLASH_ROM_IMPL` enabling this option will free some IRAM but will mean that esp_flash bugfixes and new flash chip support is not available.
:CONFIG_ESP_ROM_HAS_SPI_FLASH: - :ref:`CONFIG_SPI_FLASH_ROM_IMPL` enabling this option will free some IRAM but will mean that esp_flash bugfixes and new flash chip support is not available, see :doc:`/api-reference/peripherals/spi_flash/spi_flash_idf_vs_rom` for details.
:esp32: - :ref:`CONFIG_SPI_FLASH_ROM_DRIVER_PATCH` disabling this option will free some IRAM but is only available in some flash configurations (see the configuration item help text).
:esp32: - If the application uses PSRAM and is based on ESP32 rev. 3 (ECO3), setting :ref:`CONFIG_ESP32_REV_MIN` to ``3`` will disable PSRAM bug workarounds, saving ~10kB or more of IRAM.
- Disabling :ref:`CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR` prevents posting ``esp_event`` events from :ref:`iram-safe-interrupt-handlers` but will save some IRAM.