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doc: update the memory types and startup docs

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Angus Gratton
2021-03-02 16:00:10 +11:00
parent 2e98a5d796
commit 492b061cbc
9 changed files with 239 additions and 120 deletions
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docs/en/api-reference/system/mem_alloc.rst
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@@ -92,6 +92,10 @@ DMA-Capable Memory
Use the ``MALLOC_CAP_DMA`` flag to allocate memory which is suitable for use with hardware DMA engines (for example SPI and I2S). This capability flag excludes any external PSRAM.
.. only SOC_SPIRAM_SUPPORTED and not esp32::
The EDMA hardware feature allows DMA buffers to be placed in external PSRAM, but there may be additional alignment constraints. Consult the {IDF_TARGET_NAME} Technical Reference Manual for details. To allocate a DMA-capable external memory buffer, use the ``MALLOC_CAP_SPIRAM`` capabilities flag together with :cpp:func:`heap_caps_aligned_alloc` with the necessary alignment specified.
.. _32-bit accessible memory:
32-Bit Accessible Memory