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[adc] Place ADC oneshot control functions in IRAM for cache safety (#15717)

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This commit is contained in:
J. Nick Koston
2026-04-13 13:59:32 -10:00
committed by GitHub
parent 8cdffef82a
commit 73c972a604
2 changed files with 38 additions and 1 deletions
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15
esphome/components/adc/sensor.py
View File

@@ -2,7 +2,11 @@ import logging
import esphome.codegen as cg
from esphome.components import sensor, voltage_sampler
from esphome.components.esp32 import get_esp32_variant, include_builtin_idf_component
from esphome.components.esp32 import (
get_esp32_variant,
include_builtin_idf_component,
require_adc_oneshot_iram,
)
from esphome.components.nrf52.const import AIN_TO_GPIO, EXTRA_ADC
from esphome.components.zephyr import (
zephyr_add_overlay,
@@ -24,6 +28,7 @@ from esphome.const import (
PlatformFramework,
)
from esphome.core import CORE
from esphome.types import ConfigType
from . import (
ATTENUATION_MODES,
@@ -65,6 +70,13 @@ def validate_config(config):
return config
def _require_adc_iram(config: ConfigType) -> ConfigType:
"""Register ADC oneshot IRAM requirement during config validation."""
if CORE.is_esp32:
require_adc_oneshot_iram()
return config
ADCSensor = adc_ns.class_(
"ADCSensor", sensor.Sensor, cg.PollingComponent, voltage_sampler.VoltageSampler
)
@@ -95,6 +107,7 @@ CONFIG_SCHEMA = cv.All(
)
.extend(cv.polling_component_schema("60s")),
validate_config,
_require_adc_iram,
)
CONF_ADC_CHANNEL_ID = "adc_channel_id"

24
esphome/components/esp32/__init__.py
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_ADC_ONESHOT_IN_IRAM = "adc_oneshot_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_ADC_ONESHOT_IRAM_REQUIRED = "adc_oneshot_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_adc_oneshot_iram() -> None:
"""Mark that ADC oneshot IRAM safety is required by a component.
Call this from components that use the ADC oneshot driver. When flash cache is
disabled (e.g., during NVS writes by WiFi, BLE, Zigbee, or power management),
the ADC oneshot read function must be in IRAM to avoid crashes.
This sets CONFIG_ADC_ONESHOT_CTRL_FUNC_IN_IRAM.
"""
CORE.data[KEY_ESP32][KEY_ADC_ONESHOT_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_ADC_ONESHOT_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 ADC oneshot control functions in IRAM for cache safety
# When flash cache is disabled (during NVS writes by WiFi, BLE, Zigbee, Thread,
# power management, etc.), ADC reads will crash if these functions are in flash.
# Components using ADC call require_adc_oneshot_iram() to force this.
if (
CORE.data[KEY_ESP32].get(KEY_ADC_ONESHOT_IRAM_REQUIRED, False)
or advanced[CONF_ADC_ONESHOT_IN_IRAM]
):
add_idf_sdkconfig_option("CONFIG_ADC_ONESHOT_CTRL_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):