diff --git a/.gitignore b/.gitignore
index 4010182..5e1d720 100644
--- a/.gitignore
+++ b/.gitignore
@@ -435,3 +435,10 @@ docs/specs/tone_plan_wav_assets/assets
 docs/wav_clean_8k/
 docs/wav_ptt_vintage_8k/
 
+# ESP-IDF
+/build/
+/sdkconfig
+/sdkconfig.old
+/dependencies.lock
+/managed_components/
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..073e01e
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.16)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(rtc_bl_phone)
diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
new file mode 100644
index 0000000..2de178d
--- /dev/null
+++ b/main/CMakeLists.txt
@@ -0,0 +1,5 @@
+idf_component_register(
+    SRCS "app_main.c"
+    INCLUDE_DIRS "."
+    REQUIRES nvs_flash
+)
diff --git a/main/app_main.c b/main/app_main.c
new file mode 100644
index 0000000..645fc74
--- /dev/null
+++ b/main/app_main.c
@@ -0,0 +1,15 @@
+#include "esp_log.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static const char *TAG = "rtc_phone";
+
+void app_main(void)
+{
+    ESP_LOGI(TAG, "RTC BL PHONE — socle ESP-IDF v5.4 (esp32 classique)");
+    ESP_LOGI(TAG, "boot OK — aucun driver chargé (Phase 1)");
+    while (true) {
+        ESP_LOGI(TAG, "heartbeat");
+        vTaskDelay(pdMS_TO_TICKS(5000));
+    }
+}