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Code Issues Releases Wiki Activity

[esp32] Move heap functions to flash, saving ~6KB (#12862)

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This commit is contained in:
J. Nick Koston
2026-01-03 16:00:50 -10:00
committed by GitHub
parent 32562ca991
commit 5d384c77c5
1 changed files with 8 additions and 0 deletions
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8
esphome/components/esp32/__init__.py
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@@ -644,6 +644,7 @@ CONF_DISABLE_VFS_SUPPORT_SELECT = "disable_vfs_support_select"
CONF_DISABLE_VFS_SUPPORT_DIR = "disable_vfs_support_dir"
CONF_FREERTOS_IN_IRAM = "freertos_in_iram"
CONF_RINGBUF_IN_IRAM = "ringbuf_in_iram"
CONF_HEAP_IN_IRAM = "heap_in_iram"
CONF_LOOP_TASK_STACK_SIZE = "loop_task_stack_size"
# VFS requirement tracking
@@ -745,6 +746,7 @@ FRAMEWORK_SCHEMA = cv.Schema(
cv.Optional(CONF_DISABLE_VFS_SUPPORT_DIR, default=True): cv.boolean,
cv.Optional(CONF_FREERTOS_IN_IRAM, default=False): cv.boolean,
cv.Optional(CONF_RINGBUF_IN_IRAM, default=False): cv.boolean,
cv.Optional(CONF_HEAP_IN_IRAM, default=False): cv.boolean,
cv.Optional(CONF_EXECUTE_FROM_PSRAM, default=False): cv.boolean,
cv.Optional(CONF_LOOP_TASK_STACK_SIZE, default=8192): cv.int_range(
min=8192, max=32768
@@ -1090,6 +1092,12 @@ async def to_code(config):
# Place in flash to save IRAM (default)
add_idf_sdkconfig_option("CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH", True)
# Place heap functions into flash to save IRAM (~4-6KB savings)
# Safe as long as heap functions are not called from ISRs (which they shouldn't be)
# Users can set heap_in_iram: true as an escape hatch if needed
if not conf[CONF_ADVANCED][CONF_HEAP_IN_IRAM]:
add_idf_sdkconfig_option("CONFIG_HEAP_PLACE_FUNCTION_INTO_FLASH", True)
# Setup watchdog
add_idf_sdkconfig_option("CONFIG_ESP_TASK_WDT", True)
add_idf_sdkconfig_option("CONFIG_ESP_TASK_WDT_PANIC", True)