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Step 7 prep: enable the 32 MB PSRAM

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CONFIG_SPIRAM=y (hex mode, 200 MHz; 250 MHz needs chip rev >= 3).
malloc() places blocks above 16 KB in PSRAM, 32 KB internal RAM stays
reserved, DMA buffers remain internal. Needed for HLS segment buffers,
cspot and decoders.
Verified on board: psram_free 33,551,300 bytes, internal heap 463 KB,
PTP locked, AES67 stream unchanged (1000/s, no gaps, tone within 1 LSB).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ben Nicholson
2026-09-25 14:27:04 +10:00
parent 1961c7fe13
commit 2a7ab7922d
1 changed files with 4 additions and 0 deletions
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sdkconfig.defaults
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@@ -24,3 +24,7 @@ CONFIG_ETH_TRANSMIT_MUTEX=y
# use 7, leaving ~3 for web clients (httpd allows 7): a browser's keep-alive connections then # use 7, leaving ~3 for web clients (httpd allows 7): a browser's keep-alive connections then
# starve new requests. 16 = 7 others + 7 web clients + OTA self-test client + 1 spare. # starve new requests. 16 = 7 others + 7 web clients + OTA self-test client + 1 spare.
CONFIG_LWIP_MAX_SOCKETS=16 CONFIG_LWIP_MAX_SOCKETS=16
# 32 MB PSRAM in the P4 package (hex mode, 200 MHz; 250 MHz needs rev >= 3). Needed for step 7:
# HLS segment buffers, cspot, decoders. malloc() puts blocks >16 KB in PSRAM; DMA buffers stay internal.
CONFIG_SPIRAM=y