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Use PSRAM to reduce heap usage percentage on ESP32 with PSRAM #8891

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Merged
thebentern merged 5 commits into from
Dec 10, 2025
Merged

Use PSRAM to reduce heap usage percentage on ESP32 with PSRAM #8891

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5e0ecf9
Use PSRAM for malloc > 256bytes to get more heap memory
samm-git Dec 7, 2025
a59a0e2
Use dynamic allocator on boards with PSRAM to free more heap
samm-git Dec 7, 2025
58c5724
Apply suggestion from @Copilot
thebentern Dec 7, 2025
c25e73f
Move heap_caps_malloc_extmem_enable() to the top of the init
samm-git Dec 8, 2025
1bba9b4
Update src/main.cpp
samm-git Dec 8, 2025
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5 changes: 5 additions & 0 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -439,6 +439,11 @@ void setup()

LOG_INFO("\n\n//\\ E S H T /\\ S T / C\n");

#if defined(ARCH_ESP32) && defined(BOARD_HAS_PSRAM)
// use PSRAM for malloc calls > 256 bytes
heap_caps_malloc_extmem_enable(256);
#endif

#if defined(DEBUG_MUTE) && defined(DEBUG_PORT)
DEBUG_PORT.printf("\r\n\r\n//\\ E S H T /\\ S T / C\r\n");
DEBUG_PORT.printf("Version %s for %s from %s\r\n", optstr(APP_VERSION), optstr(APP_ENV), optstr(APP_REPO));
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4 changes: 2 additions & 2 deletions src/mesh/Router.cpp
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Expand Up @@ -37,8 +37,8 @@

static MemoryDynamic<meshtastic_MeshPacket> dynamicPool;
Allocator<meshtastic_MeshPacket> &packetPool = dynamicPool;
#elif defined(ARCH_STM32WL)
// On STM32 there isn't enough heap left over for the rest of the firmware if we allocate this statically.
#elif defined(ARCH_STM32WL) || defined(BOARD_HAS_PSRAM)
// On STM32 and boards with PSRAM, there isn't enough heap left over for the rest of the firmware if we allocate this statically.
// For now, make it dynamic again.
#define MAX_PACKETS \
(MAX_RX_TOPHONE + MAX_RX_FROMRADIO + 2 * MAX_TX_QUEUE + \
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