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[esp32] Add option to disable libc locks in IRAM, saving ~1.3KB RAM (#10930)

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
J. Nick Koston
2025-10-15 09:34:14 -10:00
committed by GitHub
parent 5510ece6ac
commit 2b3e7f38d2
3 changed files with 12 additions and 0 deletions
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10
esphome/components/esp32/__init__.py
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@@ -544,6 +544,7 @@ CONF_ENABLE_LWIP_MDNS_QUERIES = "enable_lwip_mdns_queries"
CONF_ENABLE_LWIP_BRIDGE_INTERFACE = "enable_lwip_bridge_interface" CONF_ENABLE_LWIP_BRIDGE_INTERFACE = "enable_lwip_bridge_interface"
CONF_ENABLE_LWIP_TCPIP_CORE_LOCKING = "enable_lwip_tcpip_core_locking" CONF_ENABLE_LWIP_TCPIP_CORE_LOCKING = "enable_lwip_tcpip_core_locking"
CONF_ENABLE_LWIP_CHECK_THREAD_SAFETY = "enable_lwip_check_thread_safety" CONF_ENABLE_LWIP_CHECK_THREAD_SAFETY = "enable_lwip_check_thread_safety"
CONF_DISABLE_LIBC_LOCKS_IN_IRAM = "disable_libc_locks_in_iram"
def _validate_idf_component(config: ConfigType) -> ConfigType: def _validate_idf_component(config: ConfigType) -> ConfigType:
@@ -606,6 +607,9 @@ FRAMEWORK_SCHEMA = cv.All(
cv.Optional( cv.Optional(
CONF_ENABLE_LWIP_CHECK_THREAD_SAFETY, default=True CONF_ENABLE_LWIP_CHECK_THREAD_SAFETY, default=True
): cv.boolean, ): cv.boolean,
cv.Optional(
CONF_DISABLE_LIBC_LOCKS_IN_IRAM, default=True
): cv.boolean,
cv.Optional(CONF_EXECUTE_FROM_PSRAM): cv.boolean, cv.Optional(CONF_EXECUTE_FROM_PSRAM): cv.boolean,
} }
), ),
@@ -864,6 +868,12 @@ async def to_code(config):
if advanced.get(CONF_ENABLE_LWIP_CHECK_THREAD_SAFETY, True): if advanced.get(CONF_ENABLE_LWIP_CHECK_THREAD_SAFETY, True):
add_idf_sdkconfig_option("CONFIG_LWIP_CHECK_THREAD_SAFETY", True) add_idf_sdkconfig_option("CONFIG_LWIP_CHECK_THREAD_SAFETY", True)
# Disable placing libc locks in IRAM to save RAM
# This is safe for ESPHome since no IRAM ISRs (interrupts that run while cache is disabled)
# use libc lock APIs. Saves approximately 1.3KB (1,356 bytes) of IRAM.
if advanced.get(CONF_DISABLE_LIBC_LOCKS_IN_IRAM, True):
add_idf_sdkconfig_option("CONFIG_LIBC_LOCKS_PLACE_IN_IRAM", False)
cg.add_platformio_option("board_build.partitions", "partitions.csv") cg.add_platformio_option("board_build.partitions", "partitions.csv")
if CONF_PARTITIONS in config: if CONF_PARTITIONS in config:
add_extra_build_file( add_extra_build_file(

1
tests/components/esp32/test.esp32-idf.yaml
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@@ -5,6 +5,7 @@ esp32:
advanced: advanced:
enable_lwip_mdns_queries: true enable_lwip_mdns_queries: true
enable_lwip_bridge_interface: true enable_lwip_bridge_interface: true
disable_libc_locks_in_iram: false # Test explicit opt-out of RAM optimization
wifi: wifi:
ssid: MySSID ssid: MySSID

1
tests/components/esp32/test.esp32-s3-idf.yaml
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@@ -4,6 +4,7 @@ esp32:
type: esp-idf type: esp-idf
advanced: advanced:
execute_from_psram: true execute_from_psram: true
disable_libc_locks_in_iram: true # Test default RAM optimization enabled
psram: psram:
mode: octal mode: octal