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rp2: Add support for PSRAM with auto-detection.

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Performs a best-effort attempt to detect attached PSRAM, configure it and
*add* it to the MicroPython heap.  If PSRAM is not present, should fall
back to use internal RAM.

Introduce two new port/board defines:
- MICROPY_HW_ENABLE_PSRAM to enable PSRAM.
- MICROPY_HW_PSRAM_CS_PIN to define the chip-select pin (required).

Changes are:
- ports/rp2/rp2_psram.[ch]: Add new PSRAM module.
- ports/rp2/main.c: Add optional PSRAM support.
- ports/rp2/CMakeLists.txt: Include rp2_psram.c.
- ports/rp2/mpconfigport.h: Add MICROPY_HW_ENABLE_PSRAM.
- ports/rp2/modmachine.c: Reconfigure PSRAM on freq change.

Co-authored-by: Kirk Benell <kirk.benell@sparkfun.com>
Co-authored-by: Mike Bell <mike@mercuna.com>
Signed-off-by: Phil Howard <phil@gadgetoid.com>
This commit is contained in:
Phil Howard
2024-08-06 19:49:40 +01:00
committed by Damien George
parent 9e9be83fd6
commit 11f057dd9a
6 changed files with 270 additions and 0 deletions
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4
ports/rp2/mpconfigport.h
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@@ -81,6 +81,10 @@
#define MICROPY_CONFIG_ROM_LEVEL (MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES)
#endif
#ifndef MICROPY_HW_ENABLE_PSRAM
#define MICROPY_HW_ENABLE_PSRAM (0)
#endif
// Memory allocation policies
#define MICROPY_GC_STACK_ENTRY_TYPE uint16_t
#define MICROPY_ALLOC_PATH_MAX (128)