Add ability to reserve psram #6667
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If I understand this correctly, this may be a benefit to the FrameBuffer code for the dot clock display. I ran into a likely related issue that since CircuitPython claims all the ESP32-s3’ s PSRAM, there is no PSRAM available for ESP-IDF allocations. I needed to initialize a big FrameBuffer for the dot clock display, usually allocated by the ESP-IDF RGB panel init function. To make it work, I chose to hack the ESP-IDF so that the RGB display init function can be called with a pre-allocated FrameBuffer (allocated from CircuitPython-land from the CP heap). My original plan was to request this capability to be added into the ESP-IDF. But perhaps this code will allow the the FrameBuffer to be allocated by the ESP-IDF functions without modifications to the ESP-IDF. (Note for posterity related to #6049 : This may overcome one ESP-IDF related issue for the RGB display. There is at at least one other change required to the ESP-IDF related to triggering the refresh from CircuitPython. There are other changes to the ESP-IDF related to the “bounce buffer” that were merged in the main branch but may not have yet been back ported to v4.4) jepler - special thanks for the ping. |
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One question: to preserve a display framebuffer when code.py finishes, Scott mentioned that the memory needs to be copied over somewhere else. Will this PR allow for that capability to move the FrameBuffer even if it’s allocated by the ESP-IDF? |
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The memory that is allocated by the esp-idf remains forever, even over resets of the interpreter. |
jepler
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.. the primary user of which will be the camera, since the framebuffers must be allocated via esp-idf allocation function and never from the gc heap. A board can have a default value, and the value can also be set in the /.env file using the key CIRCUITPY_RESERVED_PSRAM with the value being the reserved size in bytes. Co-authored-by: Dan Halbert <[email protected]>
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.. the primary user of which will be the camera, since the framebuffers must be allocated via esp-idf allocation function and never from the gc heap.
A board can have a default value, and the value can also be set in the /.env file using the key CIRCUITPY_RESERVED_PSRAM with the value being the reserved size in bytes.
This may also help with the allocation of memory for dot clock framebuffers, so giving @kmatch98 a ping.