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[remote_receiver] Place RMT receive functions in IRAM for cache safety

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When flash cache is disabled during background flash operations (NVS
writes by WiFi, BLE, Zigbee, Thread, power management, etc.), the RMT
receive function will crash if it is in flash. This places the RMT
receive functions in IRAM by setting CONFIG_RMT_RECV_FUNC_IN_IRAM
when the remote_receiver component is used.

Adds require_rmt_recv_iram() helper and rmt_recv_in_iram advanced
config option.
This commit is contained in:
J. Nick Koston
2026-04-13 11:04:21 -10:00
parent b85a7ef317
commit e706bdbadd
2 changed files with 25 additions and 0 deletions
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esphome/components/esp32/__init__.py
+24
View File
@@ -1058,6 +1058,7 @@ CONF_DISABLE_MBEDTLS_PEER_CERT = "disable_mbedtls_peer_cert"
CONF_DISABLE_MBEDTLS_PKCS7 = "disable_mbedtls_pkcs7"
CONF_DISABLE_REGI2C_IN_IRAM = "disable_regi2c_in_iram"
CONF_DISABLE_FATFS = "disable_fatfs"
CONF_RMT_RECV_IN_IRAM = "rmt_recv_in_iram"
# VFS requirement tracking
# Components that need VFS features can call require_vfs_*() functions
@@ -1071,6 +1072,7 @@ KEY_MBEDTLS_PEER_CERT_REQUIRED = "mbedtls_peer_cert_required"
KEY_MBEDTLS_PKCS7_REQUIRED = "mbedtls_pkcs7_required"
KEY_FATFS_REQUIRED = "fatfs_required"
KEY_MBEDTLS_SHA512_REQUIRED = "mbedtls_sha512_required"
KEY_RMT_RECV_IRAM_REQUIRED = "rmt_recv_iram_required"
def require_vfs_select() -> None:
@@ -1168,6 +1170,17 @@ def require_fatfs() -> None:
CORE.data[KEY_ESP32][KEY_FATFS_REQUIRED] = True
def require_rmt_recv_iram() -> None:
"""Mark that RMT receive IRAM safety is required by a component.
Call this from components that use the RMT receive driver. When flash cache is
disabled (e.g., during NVS writes by WiFi, BLE, Zigbee, or power management),
the RMT receive function must be in IRAM to avoid crashes.
This sets CONFIG_RMT_RECV_FUNC_IN_IRAM.
"""
CORE.data[KEY_ESP32][KEY_RMT_RECV_IRAM_REQUIRED] = True
def _parse_idf_component(value: str) -> ConfigType:
"""Parse IDF component shorthand syntax like 'owner/component^version'"""
# Match operator followed by version-like string (digit or *)
@@ -1268,6 +1281,7 @@ FRAMEWORK_SCHEMA = cv.Schema(
cv.Optional(CONF_DISABLE_MBEDTLS_PEER_CERT, default=True): cv.boolean,
cv.Optional(CONF_DISABLE_MBEDTLS_PKCS7, default=True): cv.boolean,
cv.Optional(CONF_DISABLE_REGI2C_IN_IRAM, default=True): cv.boolean,
cv.Optional(CONF_RMT_RECV_IN_IRAM, default=False): cv.boolean,
cv.Optional(CONF_DISABLE_FATFS, default=True): cv.boolean,
}
),
@@ -2068,6 +2082,16 @@ async def to_code(config):
if advanced[CONF_DISABLE_REGI2C_IN_IRAM]:
add_idf_sdkconfig_option("CONFIG_ESP_REGI2C_CTRL_FUNC_IN_IRAM", False)
# Place RMT receive functions in IRAM for cache safety
# When flash cache is disabled (during NVS writes by WiFi, BLE, Zigbee, Thread,
# power management, etc.), RMT receive will crash if these functions are in flash.
# Components using RMT receive call require_rmt_recv_iram() to force this.
if (
CORE.data[KEY_ESP32].get(KEY_RMT_RECV_IRAM_REQUIRED, False)
or advanced[CONF_RMT_RECV_IN_IRAM]
):
add_idf_sdkconfig_option("CONFIG_RMT_RECV_FUNC_IN_IRAM", True)
# Disable FATFS support
# Components that need FATFS (SD card, etc.) can call require_fatfs()
if CORE.data[KEY_ESP32].get(KEY_FATFS_REQUIRED, False):
esphome/components/remote_receiver/__init__.py
+1
View File
@@ -201,6 +201,7 @@ async def to_code(config):
if CORE.is_esp32 and esp32.get_esp32_variant() not in esp32_rmt.VARIANTS_NO_RMT:
# Re-enable ESP-IDF's RMT driver (excluded by default to save compile time)
esp32.include_builtin_idf_component("esp_driver_rmt")
esp32.require_rmt_recv_iram()
var = cg.new_Pvariable(config[CONF_ID], pin)
cg.add(var.set_rmt_symbols(config[CONF_RMT_SYMBOLS]))