From d78496321e2a65208fe83d7ea93d7107914419b0 Mon Sep 17 00:00:00 2001 From: "J. Nick Koston" Date: Thu, 19 Feb 2026 11:41:00 -0600 Subject: [PATCH] [esp32_ble] Enable CONFIG_BT_RELEASE_IRAM on ESP32-C2 (#14109) Co-authored-by: Claude Opus 4.6 --- esphome/components/esp32_ble/__init__.py | 10 ++++++++++ tests/components/esp32_ble/test.esp32-c2-idf.yaml | 5 +++++ 2 files changed, 15 insertions(+) create mode 100644 tests/components/esp32_ble/test.esp32-c2-idf.yaml diff --git a/esphome/components/esp32_ble/__init__.py b/esphome/components/esp32_ble/__init__.py index dcc3ce71cf..d2020ada22 100644 --- a/esphome/components/esp32_ble/__init__.py +++ b/esphome/components/esp32_ble/__init__.py @@ -9,6 +9,7 @@ from esphome import automation import esphome.codegen as cg from esphome.components import socket from esphome.components.esp32 import add_idf_sdkconfig_option, const, get_esp32_variant +from esphome.components.esp32.const import VARIANT_ESP32C2 import esphome.config_validation as cv from esphome.const import ( CONF_ENABLE_ON_BOOT, @@ -387,6 +388,15 @@ def final_validation(config): f"Name '{name}' is too long, maximum length is {max_length} characters" ) + # ESP32-C2 has very limited RAM (~272KB). Without releasing BLE IRAM, + # esp_bt_controller_init fails with ESP_ERR_NO_MEM. + # CONFIG_BT_RELEASE_IRAM changes the memory layout so IRAM and DRAM share + # space more flexibly, giving the BT controller enough contiguous memory. + # This requires CONFIG_ESP_SYSTEM_PMP_IDRAM_SPLIT to be disabled. + if get_esp32_variant() == VARIANT_ESP32C2: + add_idf_sdkconfig_option("CONFIG_BT_RELEASE_IRAM", True) + add_idf_sdkconfig_option("CONFIG_ESP_SYSTEM_PMP_IDRAM_SPLIT", False) + # Set GATT Client/Server sdkconfig options based on which components are loaded full_config = fv.full_config.get() diff --git a/tests/components/esp32_ble/test.esp32-c2-idf.yaml b/tests/components/esp32_ble/test.esp32-c2-idf.yaml new file mode 100644 index 0000000000..f8defaf28f --- /dev/null +++ b/tests/components/esp32_ble/test.esp32-c2-idf.yaml @@ -0,0 +1,5 @@ +<<: !include common.yaml + +esp32_ble: + io_capability: keyboard_only + disable_bt_logs: false