Sync

.vscode/launch.json

@@ -7,6 +7,13 @@
 			"name": "Launch firmware/build_nrf52840dk_debug",
 			"config": "${workspaceFolder}/firmware/build_nrf52840dk_debug",
 			"runToEntryPoint": "main"
+		},
+		{
+			"type": "nrf-connect",
+			"request": "launch",
+			"name": "Launch firmware/build_buzzy/firmware",
+			"config": "${workspaceFolder}/firmware/build_buzzy/firmware",
+			"runToEntryPoint": "main"
 		}
 	]
 }

.vscode/settings.json

@@ -8,6 +8,7 @@
     ],
     "cmake.sourceDirectory": "C:/Projekte/buzzer_2/firmware/libs/ble_mgmt",
     "nrf-connect.debugging.bindings": {
-        "${workspaceFolder}/firmware/build_nrf52840dk_debug": "Launch firmware/build_nrf52840dk_debug"
+        "${workspaceFolder}/firmware/build_nrf52840dk_debug": "Launch firmware/build_nrf52840dk_debug",
+        "${workspaceFolder}/firmware/build_buzzy/firmware": "Launch firmware/build_buzzy/firmware"
     }
 }

.vscode/tasks.json

@@ -0,0 +1,26 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "MAC RTT Streamer",
+            "type": "shell",
+            "command": "bash",
+            "args": [
+                "-c",
+                "while true; do nc localhost 19021; sleep 0.2; done"
+            ],
+            "presentation": {
+                "echo": false,
+                "reveal": "always",
+                "focus": false,
+                "panel": "shared",
+                "showReuseMessage": false,
+                "clear": true
+            },
+            "runOptions": {
+                "runOn": "folderOpen"
+            },
+            "problemMatcher": []
+        }
+    ]
+}

firmware/VERSION

@@ -1,6 +1,6 @@
 VERSION_MAJOR = 0
 VERSION_MINOR = 0
-PATCHLEVEL = 6
+PATCHLEVEL = 77
 VERSION_TWEAK = 0
 #if (IS_ENABLED(CONFIG_LOG))
 EXTRAVERSION = debug

firmware/boards/buzzy_nrf52840.conf

@@ -1,2 +1,2 @@
-# Keep SPI NOR page layout aligned with generated LittleFS block size (4KB).
+# Keep QSPI NOR page layout aligned with generated LittleFS block size (4KB).
-CONFIG_SPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096
+CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096

firmware/boards/iten/buzzy/buzzy-pinctrl.dtsi

@@ -18,47 +18,47 @@
 		};
 	};
 	
-	spi3_default: spi3_default {
+	// spi3_default: spi3_default {
-		group1 {
+	// 	group1 {
-			psels = <NRF_PSEL(SPIM_SCK, 0, 2)>,
+	// 		psels = <NRF_PSEL(SPIM_SCK, 0, 2)>,
-			<NRF_PSEL(SPIM_MOSI, 0, 29)>,
+	// 		<NRF_PSEL(SPIM_MOSI, 0, 29)>,
-			<NRF_PSEL(SPIM_MISO, 0, 30)>;
+	// 		<NRF_PSEL(SPIM_MISO, 0, 30)>;
-		};
+	// 	};
-	};
+	// };
 	
-	spi3_sleep: spi3_sleep {
+	// spi3_sleep: spi3_sleep {
-		group1 {
+	// 	group1 {
-			psels = <NRF_PSEL(SPIM_SCK, 0, 2)>,
+	// 		psels = <NRF_PSEL(SPIM_SCK, 0, 2)>,
-			<NRF_PSEL(SPIM_MOSI, 0, 29)>,
+	// 		<NRF_PSEL(SPIM_MOSI, 0, 29)>,
-			<NRF_PSEL(SPIM_MISO, 0, 30)>;
+	// 		<NRF_PSEL(SPIM_MISO, 0, 30)>;
-			low-power-enable;
+	// 		low-power-enable;
-		};
+	// 	};
-	};
+	// };
 	
 	/*
 	* Optional future QSPI pinctrl states (keep disabled for now).
 	* Use these when switching from &spi3 to &qspi in buzzy.dts.
 	*/
-	// qspi_default: qspi_default {
+	qspi_default: qspi_default {
-	// 	group1 {
+		group1 {
-	// 		psels = <NRF_PSEL(QSPI_SCK, 0, 2)>,
+			psels = <NRF_PSEL(QSPI_SCK, 0, 2)>,
-	// 		<NRF_PSEL(QSPI_CSN, 0, 5)>,
+			<NRF_PSEL(QSPI_CSN, 0, 5)>,
-	// 		<NRF_PSEL(QSPI_IO0, 0, 29)>,
+			<NRF_PSEL(QSPI_IO0, 0, 29)>,
-	// 		<NRF_PSEL(QSPI_IO1, 0, 30)>,
+			<NRF_PSEL(QSPI_IO1, 0, 30)>,
-	// 		<NRF_PSEL(QSPI_IO2, 0, 31)>,
+			<NRF_PSEL(QSPI_IO2, 0, 31)>,
-	// 		<NRF_PSEL(QSPI_IO3, 1, 13)>;
+			<NRF_PSEL(QSPI_IO3, 1, 13)>;
-	// 	};
+		};
-	// };
+	};
 	
-	// qspi_sleep: qspi_sleep {
+	qspi_sleep: qspi_sleep {
-	// 	group1 {
+		group1 {
-	// 		psels = <NRF_PSEL(QSPI_SCK, 0, 2)>,
+			psels = <NRF_PSEL(QSPI_SCK, 0, 2)>,
-	// 		<NRF_PSEL(QSPI_CSN, 0, 5)>,
+			<NRF_PSEL(QSPI_CSN, 0, 5)>,
-	// 		<NRF_PSEL(QSPI_IO0, 0, 29)>,
+			<NRF_PSEL(QSPI_IO0, 0, 29)>,
-	// 		<NRF_PSEL(QSPI_IO1, 0, 30)>,
+			<NRF_PSEL(QSPI_IO1, 0, 30)>,
-	// 		<NRF_PSEL(QSPI_IO2, 0, 31)>,
+			<NRF_PSEL(QSPI_IO2, 0, 31)>,
-	// 		<NRF_PSEL(QSPI_IO3, 1, 13)>;
+			<NRF_PSEL(QSPI_IO3, 1, 13)>;
-	// 		low-power-enable;
+			low-power-enable;
-	// 	};
+		};
-	// };
+	};
 };

firmware/boards/iten/buzzy/buzzy.dts

@@ -54,7 +54,7 @@
 	charger_status {
 		compatible = "gpio-keys";
 		chg_status: chg_status {
-			gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+			gpios = <&gpio0 13 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
 			label = "ETA6003_CHG_STATUS";
 		};
 	};
@@ -137,17 +137,52 @@
 *   SO/SIO1-> P0.30
 *   CS     -> P0.05
 */
-&spi3 {
+// &spi3 {
+// 	status = "okay";
+// 	pinctrl-0 = <&spi3_default>;
+// 	pinctrl-1 = <&spi3_sleep>;
+// 	pinctrl-names = "default", "sleep";
+// 	cs-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
+
+// 	mx25r64: flash@0 {
+// 		compatible = "jedec,spi-nor";
+// 		reg = <0>;
+// 		spi-max-frequency = <8000000>;
+// 		jedec-id = [c2 28 17];
+// 		size = <DT_SIZE_M(64)>;
+// 		has-dpd;
+// 		t-enter-dpd = <10000>;
+// 		t-exit-dpd = <35000>;
+
+// 		partitions {
+// 			compatible = "fixed-partitions";
+// 			#address-cells = <1>;
+// 			#size-cells = <1>;
+
+// 			ext_flash_lfs: partition@0 {
+// 				label = "ext-littlefs";
+// 				reg = <0x00000000 DT_SIZE_M(8)>;
+// 			};
+// 		};
+// 	};
+// };
+
+/*
+* Optional future QSPI variant (keep disabled for now):
+* - Disable &spi3 block above.
+* - Enable &qspi block below.
+* - Keep the same flash partition layout.
+*/
+&qspi {
 	status = "okay";
-	pinctrl-0 = <&spi3_default>;
+	pinctrl-0 = <&qspi_default>;
-	pinctrl-1 = <&spi3_sleep>;
+	pinctrl-1 = <&qspi_sleep>;
 	pinctrl-names = "default", "sleep";
-	cs-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
 	
 	mx25r64: flash@0 {
-		compatible = "jedec,spi-nor";
+		compatible = "nordic,qspi-nor";
 		reg = <0>;
-		spi-max-frequency = <8000000>;
+		sck-frequency = <32000000>;
 		jedec-id = [c2 28 17];
 		size = <DT_SIZE_M(64)>;
 		has-dpd;
@@ -167,47 +202,6 @@
 	};
 };
 
-/*
-* Optional future QSPI variant (keep disabled for now):
-* - Disable &spi3 block above.
-* - Enable &qspi block below.
-* - Keep the same flash partition layout.
-*/
-// &qspi {
-// 	status = "okay";
-// 	pinctrl-0 = <&qspi_default>;
-// 	pinctrl-1 = <&qspi_sleep>;
-// 	pinctrl-names = "default", "sleep";
-
-// 	mx25r64: flash@0 {
-// 		compatible = "nordic,qspi-nor";
-// 		reg = <0>;
-// 		jedec-id = [c2 28 17];
-// 		size = <DT_SIZE_M(64)>;
-// 		has-dpd;
-// 		t-enter-dpd = <10000>;
-// 		t-exit-dpd = <35000>;
-
-// 		/* Net mapping from hardware: *
-// 		* SCK=P0.02, CSN=P0.05, IO0=P0.29, IO1=P0.30, IO2=P0.31, IO3=P1.13
-// 		*/
-// 		sck-pin = <2>;
-// 		csn-pins = <5>;
-// 		io-pins = <29>, <30>, <31>, <45>;
-
-// 		partitions {
-// 			compatible = "fixed-partitions";
-// 			#address-cells = <1>;
-// 			#size-cells = <1>;
-
-// 			ext_flash_lfs: partition@0 {
-// 				label = "ext-littlefs";
-// 				reg = <0x00000000 DT_SIZE_M(8)>;
-// 			};
-// 		};
-// 	};
-// };
-
 
 &gpio0 {
 	status = "okay";

firmware/build_output.txt

@@ -0,0 +1,22 @@
+-- west build: making build dir /Users/edi/nrf_playground/buzzer_2/firmware/build pristine
+WARNING: This looks like a fresh build and BOARD is unknown; so it probably won't work. To fix, use --board=<your-board>.
+Note: to silence the above message, run 'west config build.board_warn false'
+-- west build: generating a build system
+Loading Zephyr module(s) (Zephyr base): sysbuild_default
+-- Found Python3: /opt/nordic/ncs/toolchains/322ac893fe/opt/python@3.12/bin/python3.12 (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter
+-- Cache files will be written to: /Users/edi/Library/Caches/zephyr
+-- Found west (found suitable version "1.4.0", minimum required is "0.14.0")
+CMake Error at /opt/nordic/ncs/v3.2.1/zephyr/cmake/modules/extensions.cmake:3518 (message):
+  BOARD is not being defined on the CMake command-line, in the environment or
+  by the app.
+Call Stack (most recent call first):
+  /opt/nordic/ncs/v3.2.1/zephyr/cmake/modules/boards.cmake:61 (zephyr_check_cache)
+  cmake/modules/sysbuild_default.cmake:15 (include)
+  /opt/nordic/ncs/v3.2.1/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:75 (include)
+  /opt/nordic/ncs/v3.2.1/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
+  /opt/nordic/ncs/v3.2.1/zephyr/share/sysbuild-package/cmake/SysbuildConfig.cmake:8 (include)
+  template/CMakeLists.txt:10 (find_package)
+
+
+-- Configuring incomplete, errors occurred!
+FATAL ERROR: command exited with status 1: /opt/homebrew/bin/cmake -DWEST_PYTHON=/opt/nordic/ncs/toolchains/322ac893fe/opt/python@3.12/bin/python3.12 -B/Users/edi/nrf_playground/buzzer_2/firmware/build -GNinja -S/opt/nordic/ncs/v3.2.1/zephyr/share/sysbuild -DAPP_DIR:PATH=/Users/edi/nrf_playground/buzzer_2/firmware

firmware/debug.conf

@@ -1,6 +1,6 @@
 ### Logging
 CONFIG_LOG=y
-CONFIG_LOG_MODE_IMMEDIATE=y
+#CONFIG_LOG_MODE_IMMEDIATE=y
 CONFIG_DEBUG=y
 
 CONFIG_DEBUG_OPTIMIZATIONS=y
@@ -8,16 +8,22 @@ CONFIG_DEBUG_OPTIMIZATIONS=y
 CONFIG_INIT_STACKS=y
 CONFIG_THREAD_STACK_INFO=y
 
-### Increase logging thread stack to prevent overflow when shell active
+### Lib logging levels
-CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=2048
+# CONFIG_BATT_MGMT_LOG_LEVEL_DBG=y
-CONFIG_LOG_BUFFER_SIZE=4096
+# CONFIG_BATT_MGMT_BLINK_INTERVAL_LOGGING=y
+# CONFIG_USB_MGMT_LOG_LEVEL_DBG=y
+CONFIG_BUZZ_PROTO_LOG_LEVEL_DBG=y
 
-### Bluetooth subsystem logging (reduced noise)
+### Bluetooth
+CONFIG_BLE_MGMT=y
 CONFIG_BT_LOG_LEVEL_WRN=y
 
+### Audio
+CONFIG_BUZZ_AUDIO=n
+
 ### Shell features shared by all debug variants
 CONFIG_SHELL=y
-CONFIG_SHELL_LOG_BACKEND=n
+CONFIG_SHELL_LOG_BACKEND=y
 CONFIG_FILE_SYSTEM_SHELL=y
 CONFIG_SHELL_STACK_SIZE=2048
 CONFIG_FILE_SYSTEM_SHELL_LS_SIZE=y

firmware/libs/CMakeLists.txt

@@ -5,3 +5,5 @@ add_subdirectory(ble_mgmt)
 add_subdirectory(buzz_proto)
 add_subdirectory(audio)
 add_subdirectory(event_mgmt)
+add_subdirectory(batt_mgmt)
+add_subdirectory(usb_mgmt)

firmware/libs/Kconfig

@@ -5,3 +5,5 @@ rsource "ble_mgmt/Kconfig"
 rsource "buzz_proto/Kconfig"
 rsource "audio/Kconfig"
 rsource "event_mgmt/Kconfig"
+rsource "batt_mgmt/Kconfig"
+rsource "usb_mgmt/Kconfig"

firmware/libs/audio/src/audio.c

@@ -89,6 +89,15 @@ static void audio_set_state(enum audio_thread_state_t new_state, const char *rea
 {
     enum audio_thread_state_t old_state = atomic_get(&thread_state);
 
+    if ((old_state == AUDIO_IDLE) && (new_state != AUDIO_IDLE))
+    {
+        event_mgmt_set_event(EVENT_MGMT_AUDIO_ACTIVE);
+    }
+    else if ((old_state != AUDIO_IDLE) && (new_state == AUDIO_IDLE))
+    {
+        event_mgmt_set_event(EVENT_MGMT_AUDIO_IDLE);
+    }
+
     if (old_state != new_state)
     {
         LOG_INF("Audio state %s -> %s (%s)",

firmware/libs/batt_mgmt/CMakeLists.txt

@@ -0,0 +1,5 @@
+if(CONFIG_BATT_MGMT)
+  zephyr_library()
+  zephyr_library_sources(src/batt_mgmt.c)
+  zephyr_include_directories(include)
+endif()

firmware/libs/batt_mgmt/Kconfig

@@ -0,0 +1,96 @@
+menuconfig BATT_MGMT
+    bool "Battery Management"
+    default y
+    select ADC
+    select EVENT_MGMT
+    select GPIO
+    select USB_MGMT
+    select NRFX_SAADC
+    help
+      Library for initializing and managing the battery subsystem.
+
+if BATT_MGMT
+    config BATT_MGMT_EMPTY_THRESHOLD
+        int "Battery Empty Voltage (mV)"
+        default 3400
+        help
+          Voltage threshold treated as empty battery level (0/5).
+
+    config BATT_MGMT_SHUTDOWN_THRESHOLD
+        int "Critical shutdown voltage (mV)"
+        default 3300
+        help
+          If measured battery voltage is less than or equal to this threshold,
+          the device will power off to protect the battery.
+
+    config BATT_MGMT_FULL_THRESHOLD
+        int "Battery Full Voltage (mV)"
+        default 3980
+        help
+          Set the voltage level (in millivolts) that represents a full battery. Default is 3980 mV.
+    
+    config BATT_MGMT_80P_THRESHOLD
+        int "Battery 80% Voltage (mV)"
+        default 3820
+        help
+          Set the voltage level (in millivolts) that represents 80% battery. Default is 3820 mV.
+    
+    config BATT_MGMT_50P_THRESHOLD
+        int "Battery 50% Voltage (mV)"
+        default 3720
+        help
+          Set the voltage level (in millivolts) that represents 50% battery. Default is 3720 mV.
+
+    config BATT_MGMT_20P_THRESHOLD
+        int "Battery 20% Voltage (mV)"
+        default 3620
+        help
+          Set the voltage level (in millivolts) that represents 20% battery. Default is 3620 mV.
+
+    config BATT_MGMT_CHG_BLINKING_WINDOW_MS
+        int "Charger blinking detection window (ms)"
+        default 700
+        help
+          Time window to detect charger pin blinking (state changes). If the pin state
+          changes within this window, it's considered blinking (error state).
+
+    config BATT_MGMT_STANDBY_MEASURE_INTERVAL_MIN
+        int "Standby measurement interval (minutes)"
+        default 360
+        help
+          Measurement interval while idle in standby (no charging, no BLE, no audio).
+
+    config BATT_MGMT_ACTIVE_MEASURE_INTERVAL_MIN
+        int "Active measurement interval (minutes)"
+        default 1
+        help
+          Measurement interval while charging or BLE connected.
+
+    config BATT_MGMT_AUDIO_COOLDOWN_SEC
+        int "Audio cooldown before next measure (seconds)"
+        default 60
+        help
+          Delay before restarting periodic battery measurement after audio playback ends.
+
+    config BATT_MGMT_MONITOR_THREAD_STACK_SIZE
+        int "Battery monitor thread stack size"
+        default 1024
+        help
+          Stack size for the USB-triggered charger status monitor thread.
+
+    config BATT_MGMT_MONITOR_THREAD_PRIORITY
+        int "Battery monitor thread priority"
+        default 7
+        help
+          Cooperative priority for the monitor thread (lower number = higher priority).
+
+    config BATT_MGMT_BLINK_INTERVAL_LOGGING
+        bool "Enable logging of charger pin blinking intervals"
+        default n
+        help
+          If enabled, logs the time intervals between charger pin state changes, which can help diagnose charger connection issues.
+
+    module = BATT_MGMT
+    module-str = batt_mgmt
+    source "subsys/logging/Kconfig.template.log_config"
+endif # BATT_MGMT

firmware/libs/batt_mgmt/include/batt_mgmt.h

@@ -0,0 +1,107 @@
+#ifndef BATT_MGMT_H
+#define BATT_MGMT_H
+
+#include <zephyr/types.h>
+#include <stdbool.h>
+
+#define BATT_MGMT_OVERSAMPLING_8X 8U
+#define BATT_MGMT_OVERSAMPLING_16X 16U
+
+typedef enum {
+	BATT_STATE_DISCHARGING = 0x00,
+	BATT_STATE_FULL= 0x01,
+	BATT_STATE_CHARGING = 0x02,
+	BATT_STATE_ERROR = 0x03,
+	BATT_STATE_UNKNOWN = 0x04,
+} batt_mgmt_state_t;
+
+typedef struct {
+	batt_mgmt_state_t state;
+	uint8_t level;
+	uint8_t percent;
+	int32_t voltage_mv;
+} batt_mgmt_info_t;
+
+/**
+ * @brief Measure battery VDDH voltage.
+ *
+ * @param oversampling Oversampling factor (BATT_MGMT_OVERSAMPLING_8X or BATT_MGMT_OVERSAMPLING_16X).
+ * @param vddh_mv Pointer to store the result in millivolts.
+ * @return 0 on success, negative errno on failure.
+ */
+int batt_mgmt_measure_vddh_mv(uint8_t oversampling, int32_t *vddh_mv);
+
+/**
+ * @brief Get display voltage in millivolts.
+ *
+ * Returns the voltage value intended for UI/protocol display. Currently this is
+ * the latest measured VDDH value cached by batt_mgmt.
+ *
+ * @param vddh_mv Pointer receiving display voltage in mV.
+ * @return 0 on success, negative errno on failure.
+ */
+int batt_mgmt_get_display_voltage_mv(int32_t *vddh_mv);
+
+/**
+ * @brief Get battery level bucket (0..4) from configured thresholds.
+ *
+ * Level mapping:
+ * - 0: below 20% threshold
+ * - 1: 20%..49%
+ * - 2: 50%..79%
+ * - 3: 80%..99%
+ * - 4: full and above
+ *
+ * @param level Pointer receiving level in range 0..4.
+ * @return 0 on success, negative errno on failure.
+ */
+int batt_mgmt_get_battery_level(uint8_t *level);
+
+/**
+ * @brief Get battery percentage (0-100) from configured voltage thresholds.
+ *
+ * Uses piecewise linear interpolation over:
+ * - EMPTY..20%
+ * - 20%..50%
+ * - 50%..80%
+ * - 80%..FULL
+ *
+ * @param percent Pointer receiving percentage in range 0..100.
+ * @return 0 on success, negative errno on failure.
+ */
+int batt_mgmt_get_battery_percent(uint8_t *percent);
+
+/**
+ * @brief Get raw charger status (GPIO level).
+ *
+ * Returns the current logic level of the charger status pin (typically from ETA6003).
+ * This is the **raw GPIO status**, not a processed state machine result.
+ *
+ * @return true if charger pin is high (e.g., battery is "charging"), false if low.
+ */
+bool batt_mgmt_get_charger_status(void);
+
+/**
+ * @brief Get processed battery state with blinking detection.
+ *
+ * Returns a derived state based on:
+ * - USB VBUS presence (from usb_mgmt)
+ * - Charger status GPIO level (from batt_mgmt_get_charger_status)
+ * - Blinking detection (state changes within CONFIG_BATT_MGMT_CHG_BLINKING_WINDOW_MS)
+ *
+ * Note: This differs from batt_mgmt_get_charger_status() which returns the **raw** GPIO level.
+ *
+ * @return Battery state enum (DISCHARGING, FULL, CHARGING, or ERROR if blinking detected).
+ */
+batt_mgmt_state_t batt_mgmt_get_battery_state(void);
+
+/**
+ * @brief Get all battery information in one call.
+ *
+ * @param info Pointer receiving state, level (0..4), percent (0..100), and voltage in mV.
+ * @return 0 on success, negative errno on failure.
+ */
+int batt_mgmt_get_info(batt_mgmt_info_t *info);
+
+#endif
+

firmware/libs/batt_mgmt/src/batt_mgmt.c

@@ -0,0 +1,591 @@
+#include <zephyr/device.h>
+#include <zephyr/drivers/adc.h>
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/init.h>
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include <nrfx_saadc.h>
+
+#include <errno.h>
+#include <stdbool.h>
+
+#include "batt_mgmt.h"
+#include "usb_mgmt.h"
+
+LOG_MODULE_REGISTER(batt_mgmt, CONFIG_BATT_MGMT_LOG_LEVEL);
+
+#define BATT_VDDH_DIVIDER_FACTOR 5
+
+#define BATT_VDDH_ADC_NODE DT_PATH(zephyr_user)
+static const struct adc_dt_spec batt_vddh_adc = ADC_DT_SPEC_GET_BY_NAME(BATT_VDDH_ADC_NODE, vddh);
+
+#define BATT_CHG_STATUS_NODE DT_ALIAS(chg_status)
+static const struct gpio_dt_spec batt_chg_status = GPIO_DT_SPEC_GET(BATT_CHG_STATUS_NODE, gpios);
+
+static bool batt_mgmt_ready;
+static int64_t batt_mgmt_last_chg_change_ms;
+static int64_t batt_mgmt_last_offset_calib_ms;
+static int32_t batt_mgmt_last_vddh_mv;
+static bool batt_mgmt_chg_interrupt_enabled;
+static K_THREAD_STACK_DEFINE(batt_monitor_stack, CONFIG_BATT_MGMT_MONITOR_THREAD_STACK_SIZE);
+static struct k_thread batt_monitor_thread_data;
+static struct k_sem batt_mgmt_saadc_calib_sem;
+static int batt_mgmt_saadc_calib_rc;
+
+static void batt_mgmt_saadc_calib_handler(nrfx_saadc_evt_t const *p_event)
+{
+	if ((p_event == NULL) || (p_event->type != NRFX_SAADC_EVT_CALIBRATEDONE))
+	{
+		batt_mgmt_saadc_calib_rc = -EIO;
+	}
+	else
+	{
+		batt_mgmt_saadc_calib_rc = 0;
+	}
+
+	k_sem_give(&batt_mgmt_saadc_calib_sem);
+}
+
+static int batt_mgmt_calibrate_offset_if_needed(bool force)
+{
+	int rc;
+	int64_t now_ms = k_uptime_get();
+	int64_t calib_interval_ms = (int64_t)CONFIG_BATT_MGMT_STANDBY_MEASURE_INTERVAL_MIN * 60 * 1000;
+
+	if (!force && (now_ms - batt_mgmt_last_offset_calib_ms < calib_interval_ms))
+	{
+		return 0;
+	}
+
+	while (k_sem_take(&batt_mgmt_saadc_calib_sem, K_NO_WAIT) == 0)
+	{
+	}
+
+	batt_mgmt_saadc_calib_rc = -EIO;
+	rc = nrfx_saadc_offset_calibrate(batt_mgmt_saadc_calib_handler);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	rc = k_sem_take(&batt_mgmt_saadc_calib_sem, K_MSEC(100));
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	if (batt_mgmt_saadc_calib_rc < 0)
+	{
+		return batt_mgmt_saadc_calib_rc;
+	}
+
+	batt_mgmt_last_offset_calib_ms = k_uptime_get();
+	return 0;
+}
+
+static int batt_mgmt_to_adc_oversampling(uint8_t oversampling, uint8_t *adc_oversampling)
+{
+	if (adc_oversampling == NULL)
+	{
+		return -EINVAL;
+	}
+
+	switch (oversampling)
+	{
+	case BATT_MGMT_OVERSAMPLING_8X:
+		*adc_oversampling = 3U;
+		return 0;
+	case BATT_MGMT_OVERSAMPLING_16X:
+		*adc_oversampling = 4U;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+int batt_mgmt_measure_vddh_mv(uint8_t oversampling, int32_t *vddh_mv)
+{
+	int rc;
+	uint8_t adc_oversampling;
+	int16_t raw_sample;
+	int32_t input_mv;
+	struct adc_sequence sequence = {
+		.buffer = &raw_sample,
+		.buffer_size = sizeof(raw_sample),
+	};
+
+	if (vddh_mv == NULL)
+	{
+		return -EINVAL;
+	}
+
+	if (!batt_mgmt_ready)
+	{
+		return -EAGAIN;
+	}
+
+	rc = batt_mgmt_calibrate_offset_if_needed(false);
+	if (rc < 0)
+	{
+		LOG_WRN("ADC offset calibration failed before measurement: %d", rc);
+	}
+
+	rc = batt_mgmt_to_adc_oversampling(oversampling, &adc_oversampling);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	rc = adc_sequence_init_dt(&batt_vddh_adc, &sequence);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	sequence.oversampling = adc_oversampling;
+
+	rc = adc_read_dt(&batt_vddh_adc, &sequence);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	input_mv = raw_sample;
+	rc = adc_raw_to_millivolts_dt(&batt_vddh_adc, &input_mv);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	*vddh_mv = input_mv * BATT_VDDH_DIVIDER_FACTOR;
+	batt_mgmt_last_vddh_mv = *vddh_mv;
+
+	LOG_DBG("Battery VDDH: %d mV (raw=%d, os=%ux)", *vddh_mv, raw_sample, oversampling);
+	return 0;
+}
+
+static int batt_mgmt_linear_percent(int32_t mv, int32_t lo_mv, int32_t hi_mv,
+									uint8_t lo_pct, uint8_t hi_pct, uint8_t *out_pct)
+{
+	int32_t num;
+	int32_t den;
+	int32_t pct;
+
+	if (out_pct == NULL)
+	{
+		return -EINVAL;
+	}
+
+	if (hi_mv <= lo_mv)
+	{
+		return -EINVAL;
+	}
+
+	if (mv <= lo_mv)
+	{
+		*out_pct = lo_pct;
+		return 0;
+	}
+
+	if (mv >= hi_mv)
+	{
+		*out_pct = hi_pct;
+		return 0;
+	}
+
+	num = (mv - lo_mv) * (int32_t)(hi_pct - lo_pct);
+	den = hi_mv - lo_mv;
+	pct = (int32_t)lo_pct + (num / den);
+
+	if (pct < 0)
+	{
+		pct = 0;
+	}
+	else if (pct > 100)
+	{
+		pct = 100;
+	}
+
+	*out_pct = (uint8_t)pct;
+	return 0;
+}
+
+int batt_mgmt_get_display_voltage_mv(int32_t *vddh_mv)
+{
+	int rc;
+
+	if (vddh_mv == NULL)
+	{
+		return -EINVAL;
+	}
+
+	if (!batt_mgmt_ready)
+	{
+		return -EAGAIN;
+	}
+
+	if (batt_mgmt_last_vddh_mv <= 0)
+	{
+		rc = batt_mgmt_measure_vddh_mv(BATT_MGMT_OVERSAMPLING_16X, &batt_mgmt_last_vddh_mv);
+		if (rc < 0)
+		{
+			return rc;
+		}
+	}
+
+	*vddh_mv = batt_mgmt_last_vddh_mv;
+	return 0;
+}
+
+int batt_mgmt_get_battery_level(uint8_t *level)
+{
+	int32_t mv;
+	int rc;
+
+	if (level == NULL)
+	{
+		return -EINVAL;
+	}
+
+	rc = batt_mgmt_get_display_voltage_mv(&mv);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	if (mv >= CONFIG_BATT_MGMT_FULL_THRESHOLD)
+	{
+		*level = 4U;
+	}
+	else if (mv >= CONFIG_BATT_MGMT_80P_THRESHOLD)
+	{
+		*level = 3U;
+	}
+	else if (mv >= CONFIG_BATT_MGMT_50P_THRESHOLD)
+	{
+		*level = 2U;
+	}
+	else if (mv >= CONFIG_BATT_MGMT_20P_THRESHOLD)
+	{
+		*level = 1U;
+	}
+	else
+	{
+		*level = 0U;
+	}
+
+	return 0;
+}
+
+int batt_mgmt_get_battery_percent(uint8_t *percent)
+{
+	int32_t mv;
+	int rc;
+
+	if (percent == NULL)
+	{
+		return -EINVAL;
+	}
+
+	rc = batt_mgmt_get_display_voltage_mv(&mv);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	if (mv <= CONFIG_BATT_MGMT_EMPTY_THRESHOLD)
+	{
+		*percent = 0;
+		return 0;
+	}
+
+	if (mv >= CONFIG_BATT_MGMT_FULL_THRESHOLD)
+	{
+		*percent = 100;
+		return 0;
+	}
+
+	if (mv < CONFIG_BATT_MGMT_20P_THRESHOLD)
+	{
+		return batt_mgmt_linear_percent(mv,
+								CONFIG_BATT_MGMT_EMPTY_THRESHOLD,
+								CONFIG_BATT_MGMT_20P_THRESHOLD,
+								0, 20, percent);
+	}
+
+	if (mv < CONFIG_BATT_MGMT_50P_THRESHOLD)
+	{
+		return batt_mgmt_linear_percent(mv,
+								CONFIG_BATT_MGMT_20P_THRESHOLD,
+								CONFIG_BATT_MGMT_50P_THRESHOLD,
+								20, 50, percent);
+	}
+
+	if (mv < CONFIG_BATT_MGMT_80P_THRESHOLD)
+	{
+		return batt_mgmt_linear_percent(mv,
+								CONFIG_BATT_MGMT_50P_THRESHOLD,
+								CONFIG_BATT_MGMT_80P_THRESHOLD,
+								50, 80, percent);
+	}
+
+	return batt_mgmt_linear_percent(mv,
+							CONFIG_BATT_MGMT_80P_THRESHOLD,
+							CONFIG_BATT_MGMT_FULL_THRESHOLD,
+							80, 100, percent);
+}
+
+static void batt_mgmt_chg_interrupt_handler(const struct device *dev,
+											struct gpio_callback *cb,
+											uint32_t pins)
+{
+	int64_t now_ms = k_uptime_get();
+	ARG_UNUSED(dev);
+	ARG_UNUSED(cb);
+	ARG_UNUSED(pins);
+
+#ifdef CONFIG_BATT_MGMT_BLINK_INTERVAL_LOGGING
+	int64_t delta_ms = now_ms - batt_mgmt_last_chg_change_ms;
+	LOG_DBG("CHG interrupt: delta=%lld ms", delta_ms);
+#endif
+
+	batt_mgmt_last_chg_change_ms = now_ms;
+}
+
+static int batt_mgmt_enable_chg_interrupt(void)
+{
+	int rc;
+	static struct gpio_callback batt_chg_cb;
+
+	if (batt_mgmt_chg_interrupt_enabled)
+	{
+		return 0;
+	}
+
+	if (!gpio_is_ready_dt(&batt_chg_status))
+	{
+		LOG_ERR("CHG GPIO device not ready");
+		return -ENODEV;
+	}
+
+	rc = gpio_pin_configure_dt(&batt_chg_status, GPIO_INPUT);
+	if (rc < 0)
+	{
+		LOG_ERR("Failed to configure CHG GPIO: %d", rc);
+		return rc;
+	}
+
+	gpio_init_callback(&batt_chg_cb, batt_mgmt_chg_interrupt_handler, BIT(batt_chg_status.pin));
+	rc = gpio_add_callback(batt_chg_status.port, &batt_chg_cb);
+	if (rc < 0)
+	{
+		LOG_ERR("Failed to add CHG callback: %d", rc);
+		return rc;
+	}
+
+	rc = gpio_pin_interrupt_configure_dt(&batt_chg_status, GPIO_INT_EDGE_BOTH);
+	if (rc < 0)
+	{
+		LOG_ERR("Failed to configure CHG interrupt: %d", rc);
+		return rc;
+	}
+
+	batt_mgmt_chg_interrupt_enabled = true;
+	batt_mgmt_last_chg_change_ms = k_uptime_get();
+	LOG_INF("CHG interrupt enabled");
+
+	return 0;
+}
+
+static int batt_mgmt_disable_chg_interrupt(void)
+{
+	int rc;
+
+	if (!batt_mgmt_chg_interrupt_enabled)
+	{
+		return 0;
+	}
+
+	rc = gpio_pin_interrupt_configure_dt(&batt_chg_status, GPIO_INT_DISABLE);
+	if (rc < 0)
+	{
+		LOG_WRN("Failed to disable CHG interrupt: %d", rc);
+		return rc;
+	}
+
+	rc = gpio_pin_configure(batt_chg_status.port, batt_chg_status.pin, GPIO_DISCONNECTED);
+	if (rc < 0)
+	{
+		LOG_WRN("Failed to disconnect CHG GPIO: %d", rc);
+		return rc;
+	}
+
+	batt_mgmt_chg_interrupt_enabled = false;
+	LOG_DBG("CHG interrupt disabled");
+
+	return 0;
+}
+
+bool batt_mgmt_get_charger_status(void)
+{
+	if (!batt_mgmt_chg_interrupt_enabled)
+	{
+		return false;
+	}
+
+	return gpio_pin_get_dt(&batt_chg_status);
+}
+
+batt_mgmt_state_t batt_mgmt_get_battery_state(void)
+{
+	int64_t now_ms = k_uptime_get();
+	int64_t delta_ms = now_ms - batt_mgmt_last_chg_change_ms;
+	bool chg_high = batt_mgmt_get_charger_status();
+	bool usb_present = usb_mgmt_is_vbus_present();
+
+	/* Blinking detection: state change within window */
+	if (delta_ms < CONFIG_BATT_MGMT_CHG_BLINKING_WINDOW_MS)
+	{
+		LOG_DBG("Blinking detected (delta=%lld ms)", delta_ms);
+		return BATT_STATE_ERROR;
+	}
+
+	/* Stable states */
+	if (chg_high)
+	{
+		return BATT_STATE_CHARGING;
+	}
+
+	if (usb_present)
+	{
+		return BATT_STATE_FULL;
+	}
+
+	return BATT_STATE_DISCHARGING;
+}
+
+int batt_mgmt_get_info(batt_mgmt_info_t *info)
+{
+	int rc;
+
+	if (info == NULL)
+	{
+		return -EINVAL;
+	}
+
+	rc = batt_mgmt_get_display_voltage_mv(&info->voltage_mv);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	rc = batt_mgmt_get_battery_level(&info->level);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	rc = batt_mgmt_get_battery_percent(&info->percent);
+	if (rc < 0)
+	{
+		return rc;
+	}
+
+	info->state = batt_mgmt_get_battery_state();
+	return 0;
+}
+
+static void batt_mgmt_monitor_thread(void *unused1, void *unused2, void *unused3)
+{
+	(void)unused1;
+	(void)unused2;
+	(void)unused3;
+
+	if (!usb_mgmt_wait_ready(K_SECONDS(2)))
+	{
+		LOG_WRN("usb_mgmt not ready after timeout; using current VBUS state");
+	}
+
+	/* Sync initial state in case VBUS was already present before this thread started. */
+	bool vbus_present = usb_mgmt_is_vbus_present();
+
+	if (vbus_present)
+	{
+		(void)batt_mgmt_enable_chg_interrupt();
+	}
+	else
+	{
+		(void)batt_mgmt_disable_chg_interrupt();
+	}
+
+	while (1)
+	{
+		uint32_t events = k_event_wait(&usb_mgmt_events,
+									   USB_MGMT_VBUS_CONNECTED | USB_MGMT_VBUS_DISCONNECTED,
+									   false, K_FOREVER);
+
+		if (events & USB_MGMT_VBUS_CONNECTED)
+		{
+			(void)batt_mgmt_enable_chg_interrupt();
+		}
+
+		if (events & USB_MGMT_VBUS_DISCONNECTED)
+		{
+			(void)batt_mgmt_disable_chg_interrupt();
+		}
+
+		k_event_clear(&usb_mgmt_events, USB_MGMT_VBUS_CONNECTED | USB_MGMT_VBUS_DISCONNECTED);
+	}
+}
+
+static int batt_mgmt_init(void)
+{
+	int32_t boot_vddh_mv;
+	int rc;
+
+	if (!adc_is_ready_dt(&batt_vddh_adc))
+	{
+		LOG_ERR("VDDH ADC device not ready");
+		return -ENODEV;
+	}
+
+	rc = adc_channel_setup_dt(&batt_vddh_adc);
+	if (rc < 0)
+	{
+		LOG_ERR("VDDH ADC channel setup failed: %d", rc);
+		return rc;
+	}
+
+	k_sem_init(&batt_mgmt_saadc_calib_sem, 0, 1);
+	batt_mgmt_last_offset_calib_ms = 0;
+
+	batt_mgmt_ready = true;
+
+	rc = batt_mgmt_calibrate_offset_if_needed(true);
+	if (rc < 0)
+	{
+		LOG_WRN("Initial ADC offset calibration failed: %d", rc);
+	}
+
+	rc = batt_mgmt_measure_vddh_mv(BATT_MGMT_OVERSAMPLING_16X, &boot_vddh_mv);
+	if (rc < 0)
+	{
+		LOG_WRN("Initial battery measurement failed: %d", rc);
+		return 0;
+	}
+
+	batt_mgmt_last_vddh_mv = boot_vddh_mv;
+	LOG_DBG("Initial battery VDDH: %d mV", boot_vddh_mv);
+
+	k_thread_create(&batt_monitor_thread_data,
+					batt_monitor_stack,
+					K_THREAD_STACK_SIZEOF(batt_monitor_stack),
+					batt_mgmt_monitor_thread,
+					NULL, NULL, NULL,
+					K_PRIO_COOP(CONFIG_BATT_MGMT_MONITOR_THREAD_PRIORITY),
+					0, K_NO_WAIT);
+
+	return 0;
+}
+
+SYS_INIT(batt_mgmt_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);

firmware/libs/ble_mgmt/Kconfig

@@ -10,7 +10,7 @@ menuconfig BLE_MGMT
 if BLE_MGMT
     config BLE_MGMT_DEFAULT_DEVICE_NAME
         string "Default Bluetooth device name"
-        default "Edis Buzzer"
+        default "Edis Buzzer 2.0"
         help
           Device name used when ble_mgmt_init() is called with a NULL name.
 

firmware/libs/ble_mgmt/src/ble_mgmt.c

@@ -10,6 +10,7 @@
 #include <zephyr/logging/log.h>
 
 #include "ble_mgmt.h"
+#include "event_mgmt.h"
 
 LOG_MODULE_REGISTER(ble_mgmt, CONFIG_BLE_MGMT_LOG_LEVEL);
 
@@ -239,6 +240,8 @@ static void connected(struct bt_conn *conn, uint8_t err)
     if (peer_count() < CONFIG_BT_MAX_CONN) {
         (void)start_advertising();
     }
+
+    event_mgmt_set_event(EVENT_MGMT_BLE_CONNECTED);
 }
 
 static void disconnected(struct bt_conn *conn, uint8_t reason)
@@ -252,6 +255,8 @@ static void disconnected(struct bt_conn *conn, uint8_t reason)
     if (peer_count() < CONFIG_BT_MAX_CONN) {
         (void)start_advertising();
     }
+
+    event_mgmt_set_event(EVENT_MGMT_BLE_DISCONNECTED);
 }
 
 BT_CONN_CB_DEFINE(conn_callbacks) = {

firmware/libs/buzz_proto/include/buzz_proto.h

@@ -36,6 +36,7 @@ enum buzz_data_type
     BUZZ_DATA_DEVICE_INFO = 0x02,
     BUZZ_DATA_FS_INFO = 0x03,
     BUZZ_DATA_FW_INFO = 0x04,
+    BUZZ_DATA_BATT_INFO = 0x05,
 
     BUZZ_DATA_FILE_GET = 0x20,
     BUZZ_DATA_FILE_PUT = 0x21,
@@ -122,6 +123,17 @@ struct __attribute__((packed)) buzz_resp_fw_info
     uint8_t kernel_version_length; /* Länge der Kernel-Versionszeichenkette */
     char data[];                   /* Variabler String ohne Null-Terminierung: [fw_version][kernel_version] */
 };
+
+/* Payload für die Batterie-Infos */
+struct __attribute__((packed)) buzz_resp_batt_info
+{
+    uint8_t data_type;      /* BUZZ_DATA_BATT_INFO */
+    uint8_t batt_status;    /* batt_mgmt_state_t */
+    uint8_t batt_level;     /* 0..4 */
+    uint8_t batt_percent;   /* 0..100 */
+    uint16_t batt_voltage_mv; /* Little Endian */
+};
+
 /* Payload für das Entfernen einer Datei */
 struct __attribute__((packed)) buzz_rm_file_payload
 {

firmware/libs/buzz_proto/src/buzz_proto.c

@@ -7,6 +7,7 @@
 #include <stdlib.h>
 
 #include "buzz_proto.h"
+#include "batt_mgmt.h"
 #include "fs_mgmt.h"
 #include "fw_mgmt.h"
 
@@ -293,6 +294,43 @@ static void handle_fw_info_request(struct buzz_frame_msg *msg)
     }
 }
 
+static void handle_batt_info_request(struct buzz_frame_msg *msg)
+{
+    struct buzz_proto_header *hdr = (struct buzz_proto_header *)msg->data_ptr;
+    struct buzz_resp_batt_info *resp_data = (struct buzz_resp_batt_info *)(msg->data_ptr + sizeof(*hdr));
+    batt_mgmt_info_t batt_info;
+    uint16_t voltage_mv = 0;
+    int rc = batt_mgmt_get_info(&batt_info);
+
+    if (rc < 0)
+    {
+        LOG_WRN("Failed to get battery info: %d", rc);
+        send_error_frame(msg, abs(rc));
+        return;
+    }
+
+    if (batt_info.voltage_mv > 0)
+    {
+        voltage_mv = (batt_info.voltage_mv > UINT16_MAX) ? UINT16_MAX : (uint16_t)batt_info.voltage_mv;
+    }
+
+    hdr->frame_type = BUZZ_FRAME_RESPONSE;
+    hdr->payload_length = sys_cpu_to_le16(sizeof(struct buzz_resp_batt_info));
+
+    resp_data->data_type = BUZZ_DATA_BATT_INFO;
+    resp_data->batt_status = (uint8_t)batt_info.state;
+    resp_data->batt_level = batt_info.level;
+    resp_data->batt_percent = batt_info.percent;
+    resp_data->batt_voltage_mv = sys_cpu_to_le16(voltage_mv);
+
+    if (msg->reply_cb)
+    {
+        msg->reply_cb(msg->data_ptr, sizeof(struct buzz_proto_header) + sizeof(struct buzz_resp_batt_info));
+    }
+    LOG_DBG("Battery Info sent: state=%u, level=%u, percent=%u, voltage=%u mV",
+            batt_info.state, batt_info.level, batt_info.percent, batt_info.voltage_mv);
+}
+
 static void handle_ls_request(struct buzz_frame_msg *msg)
 {
     struct buzz_proto_header *hdr = (struct buzz_proto_header *)msg->data_ptr;
@@ -698,6 +736,11 @@ static void handle_request(struct buzz_frame_msg *msg)
         handle_fw_info_request(msg);
         break;
 
+    case BUZZ_DATA_BATT_INFO:
+        LOG_DBG("Received BATT Info Request");
+        handle_batt_info_request(msg);
+        break;
+
     case BUZZ_DATA_FILE_GET:
         LOG_DBG("Received FILE_GET Request");
         handle_file_get_request(msg, false);

firmware/libs/event_mgmt/include/event_mgmt.h

@@ -7,6 +7,8 @@
 #define EVENT_MGMT_AUDIO_READY BIT(1)
 #define EVENT_MGMT_BLE_CONNECTED BIT(2)
 #define EVENT_MGMT_BLE_DISCONNECTED BIT(3)
+#define EVENT_MGMT_AUDIO_ACTIVE BIT(4)
+#define EVENT_MGMT_AUDIO_IDLE BIT(5)
 
 extern struct k_event event_mgmt_events;
 

firmware/libs/fs_mgmt/Kconfig

@@ -7,7 +7,7 @@ menuconfig FS_MGMT
     select FILE_SYSTEM_LITTLEFS
     select FILE_SYSTEM_MKFS
     select FLASH_PAGE_LAYOUT
-    select SPI_NOR if BOARD_BUZZY
+    select NORDIC_QSPI_NOR if BOARD_BUZZY
     select PM_OVERRIDE_EXTERNAL_DRIVER_CHECK if BOARD_BUZZY
     select NORDIC_QSPI_NOR if BOARD_NRF52840DK_NRF52840
     help

firmware/libs/settings_mgmt/Kconfig

@@ -2,6 +2,7 @@ menuconfig SETTINGS_MGMT
     bool "Settings Management"
     default y
     select SETTINGS
+    select SETTINGS_RUNTIME
     select ZMS
     help
       Library for initializing and managing the settings subsystem.

firmware/libs/settings_mgmt/src/settings_mgmt.c

@@ -27,7 +27,11 @@ LOG_MODULE_REGISTER(settings_mgmt, LOG_LEVEL_INF);
 
 /* The "Source of Truth" in RAM */
 struct app_settings_t app_cfg = {
-    .dev_name = "Edis Buzzer",
+#ifdef CONFIG_BLE_MGMT_DEFAULT_DEVICE_NAME
+    .dev_name = CONFIG_BLE_MGMT_DEFAULT_DEVICE_NAME,
+#else
+    .dev_name = CONFIG_BOARD, /* Default to board name if no explicit default set */
+#endif
     .vol = 100,               /* 0-100 % */
     .shuffle_mode = 0,
     .ble_timeout = 0xFFFFFFFF,

firmware/libs/usb_mgmt/CMakeLists.txt

@@ -0,0 +1,5 @@
+if(CONFIG_USB_MGMT)
+  zephyr_library()
+  zephyr_library_sources(src/usb_mgmt.c)
+  zephyr_include_directories(include)
+endif()

firmware/libs/usb_mgmt/Kconfig

@@ -0,0 +1,13 @@
+menuconfig USB_MGMT
+    bool "USB Management"
+    default y
+    select NRFX_POWER
+    help
+      Library for USB-related queries, e.g. VBUS presence detection
+      via the nRF52840 POWER peripheral.
+
+if USB_MGMT
+    module = USB_MGMT
+    module-str = usb_mgmt
+    source "subsys/logging/Kconfig.template.log_config"
+endif # USB_MGMT

firmware/libs/usb_mgmt/include/usb_mgmt.h

@@ -0,0 +1,30 @@
+#ifndef USB_MGMT_H
+#define USB_MGMT_H
+
+#include <stdbool.h>
+#include <zephyr/kernel.h>
+
+#define USB_MGMT_VBUS_CONNECTED BIT(0)
+#define USB_MGMT_VBUS_DISCONNECTED BIT(1)
+
+extern struct k_event usb_mgmt_events;
+
+/**
+ * @brief Wait until usb_mgmt has completed initialization.
+ *
+ * @param timeout Timeout for waiting.
+ *
+ * @retval true usb_mgmt is ready.
+ * @retval false timeout occurred.
+ */
+bool usb_mgmt_wait_ready(k_timeout_t timeout);
+
+/**
+ * @brief Returns true when VBUS (USB 5 V) is present.
+ *
+ * Reads the USBREGSTATUS.VBUSDETECT bit in the nRF52840 POWER peripheral.
+ * No USB stack needs to be enabled.
+ */
+bool usb_mgmt_is_vbus_present(void);
+
+#endif /* USB_MGMT_H */

firmware/libs/usb_mgmt/src/usb_mgmt.c

@@ -0,0 +1,65 @@
+#include <hal/nrf_power.h>
+#include <nrfx_power.h>
+#include <errno.h>
+#include <zephyr/logging/log.h>
+
+#include "usb_mgmt.h"
+
+LOG_MODULE_REGISTER(usb_mgmt, CONFIG_USB_MGMT_LOG_LEVEL);
+
+K_EVENT_DEFINE(usb_mgmt_events);
+K_SEM_DEFINE(usb_mgmt_ready_sem, 0, 1);
+
+static bool usb_mgmt_last_vbus_state;
+static bool usb_mgmt_ready;
+
+static void usb_mgmt_power_handler(nrfx_power_usb_evt_t event)
+{
+	bool is_present = (event == NRFX_POWER_USB_EVT_DETECTED);
+
+	LOG_INF("VBUS %s (event=%u)", is_present ? "connected" : "disconnected", event);
+
+	if (is_present != usb_mgmt_last_vbus_state) {
+		usb_mgmt_last_vbus_state = is_present;
+		k_event_post(&usb_mgmt_events,
+			     is_present ? USB_MGMT_VBUS_CONNECTED : USB_MGMT_VBUS_DISCONNECTED);
+	}
+}
+
+static int usb_mgmt_init(void)
+{
+	usb_mgmt_last_vbus_state = nrf_power_usbregstatus_vbusdet_get(NRF_POWER);
+	LOG_DBG("Boot VBUS state: %s", usb_mgmt_last_vbus_state ? "present" : "absent");
+	k_event_post(&usb_mgmt_events,
+		     usb_mgmt_last_vbus_state ? USB_MGMT_VBUS_CONNECTED : USB_MGMT_VBUS_DISCONNECTED);
+
+	nrfx_power_config_t config = { 0 };
+	nrfx_power_usbevt_config_t usb_config = {
+		.handler = usb_mgmt_power_handler,
+	};
+
+	nrfx_power_init(&config);
+	nrfx_power_usbevt_init(&usb_config);
+	nrfx_power_usbevt_enable();
+
+	usb_mgmt_ready = true;
+	k_sem_give(&usb_mgmt_ready_sem);
+
+	return 0;
+}
+
+SYS_INIT(usb_mgmt_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
+
+bool usb_mgmt_is_vbus_present(void)
+{
+	return usb_mgmt_last_vbus_state;
+}
+
+bool usb_mgmt_wait_ready(k_timeout_t timeout)
+{
+	if (usb_mgmt_ready) {
+		return true;
+	}
+
+	return k_sem_take(&usb_mgmt_ready_sem, timeout) == 0;
+}

firmware/output.txt

@@ -0,0 +1,2 @@
+ERROR: Build directory /Users/edi/nrf_playground/buzzer_2/firmware/build targets board buzzy/nrf52840, but board {self.args.board} was specified. (Clean the directory, use --pristine, or use --build-dir to specify a different one.)
+FATAL ERROR: refusing to proceed without --force due to above error

firmware/prj.conf

@@ -1,9 +1,3 @@
-### Bluetooth
-CONFIG_BLE_MGMT=y
-
-### Audio
-CONFIG_BUZZ_AUDIO=n
-
 ### Error handling
 CONFIG_HW_STACK_PROTECTION=y
 CONFIG_RESET_ON_FATAL_ERROR=y
@@ -11,6 +5,9 @@ CONFIG_RESET_ON_FATAL_ERROR=y
 ### Power management
 CONFIG_PM_DEVICE=y
 
+### Boot banner
+CONFIG_NCS_APPLICATION_BOOT_BANNER_STRING="Edis Buzzer"
+
 ### Stack
 CONFIG_MAIN_STACK_SIZE=2048
 CONFIG_BT_RX_STACK_SIZE=4096

firmware/rtt_script.jlink

@@ -0,0 +1,5 @@
+connect
+rtt start
+sleep 3000
+rtt stop
+exit

firmware/src/main.c

@@ -3,11 +3,29 @@
 #include <string.h>
 
 #include "buzz_proto.h"
+#include "settings_mgmt.h"
+#include "batt_mgmt.h"
 // #include "fw_mgmt.h"
 // #include "audio.h"
 
 LOG_MODULE_REGISTER(main);
 
+static const char *battery_state_to_str(batt_mgmt_state_t state)
+{
+    switch (state) {
+    case BATT_STATE_DISCHARGING:
+        return "discharging";
+    case BATT_STATE_FULL:
+        return "full";
+    case BATT_STATE_CHARGING:
+        return "charging";
+    case BATT_STATE_ERROR:
+        return "error";
+    default:
+        return "unknown";
+    }
+}
+
 #if IS_ENABLED(CONFIG_BLE_MGMT)
 #include "ble_mgmt.h"
 void ble_rx_cb(const uint8_t *data, uint16_t len)
@@ -48,24 +66,36 @@ void ble_rx_cb(const uint8_t *data, uint16_t len)
 
 int main(void)
 {
+
 #if IS_ENABLED(CONFIG_BLE_MGMT)
     /* BLE-Subsystem initialisieren und RX-Callback registrieren */
-    int rc = ble_mgmt_init(ble_rx_cb, CONFIG_BLE_MGMT_DEFAULT_DEVICE_NAME);
+    int rc = ble_mgmt_init(ble_rx_cb, app_cfg.dev_name);
     if (rc < 0) {
         LOG_ERR("Failed to initialize BLE management: %d", rc);
         return rc;
     }
-    LOG_WRN("After BLE init");
 #else
     LOG_WRN("BLE not enabled");
 #endif
 
-    LOG_WRN("Main park loop active");
+#if IS_ENABLED(CONFIG_LOG)
+#if IS_ENABLED(CONFIG_BATT_MGMT)
+    k_sleep(K_SECONDS(1));
+    batt_mgmt_info_t batt_info;
+    int batt_rc = batt_mgmt_get_info(&batt_info);
+    if (batt_rc == 0) {
+        LOG_INF("Battery after 1s: %d mV, %u%%, level=%u, state=%s (%d)",
+                batt_info.voltage_mv,
+                batt_info.percent,
+                batt_info.level,
+                battery_state_to_str(batt_info.state),
+                batt_info.state);
+    } else {
+        LOG_WRN("Battery info read failed: %d", batt_rc);
+    }
+#endif // CONFIG_BATT_MGMT
+#endif // CONFIG_LOG
     
-    // k_sleep(K_MSEC(500));
-    // LOG_INF("Playing test audio files...");
-    // audio_queue_play("/lfs/sys/update", false);
-    // audio_queue_play("/lfs/sys/confirm", false);
     for (;;) {
         int32_t rem_ms = k_sleep(K_FOREVER);
         LOG_WRN("main woke unexpectedly (remaining=%d ms)", rem_ms);

protocol.md

@@ -92,6 +92,7 @@ Das Protokoll ist so ausgelegt, dass es mit mindestens 100 Bytes auskommen sollt
 | `0x02` | `DEVICE_INFO` | aktiv | Device-Infos (Board, Revision, SOC, ID) |
 | `0x03` | `FS_INFO` | aktiv | Dateisystem- und Pfadinfos |
 | `0x04` | `FW_INFO` | aktiv | Info über Firmware-Status und -Version sowie Kernelversion |
+| `0x05` | `BATT_INFO` | aktiv | Info über die Batterie |
 | `0x20` | `FILE_GET` | aktiv | Datei vom Device streamen |
 | `0x21` | `FILE_PUT` | aktiv | Datei zum Device hochladen |
 | `0x22` | `TAGS_GET` | aktiv | nur Tag-Bereich streamen |
@@ -238,6 +239,7 @@ Request: keine Zusatzdaten
 Response:
 
 ```c
+uint8_t data_type;           /* 0x04 */
 uint8_t fw_status;           /* 0x00: Confirmed, 0x01: Pending, 0x02: Testing, 0xFF: Unbekannt */
 uint32_t slot1_size;         /* (LE) Grösse des Firmware Update Slots */
 uint8_t fw_version_len;      /* Länge des Firmware-Versionsstring */
@@ -247,6 +249,20 @@ uint8_t data[];              /* FW-Version und Kernelversion, ohne Nullterminier
 
 ***Hinweis:*** in der Aktuellen implementierung werden die Versionen auf 32 Zeichen limitiert.
 
+### `BATT_INFO` (`0x05`)
+
+Request: keine Zusatzdaten
+
+Response:
+
+```c
+uint8_t data_type;           /* 0x05 */
+uint8_t batt_status;         /* 0x00: Discharging, 0x01: Full, 0x02: Charging, 0x03: Error, 0x04: Unknown */
+uint8_t batt_level;          /* 0-4, Anzahl Striche für den Akku */
+uint8_t batt_percent;        /* Akku-Füllstand in Prozent */
+uint16_t batt_voltage_mv;    /* (LE) Batteriespannung in mV */
+```
+
 ### `LS` (`0x40`)
 
 Request-Payload:

webpage/src/components/DeviceInfo.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
   import FlashUsage from "./FlashUsage.svelte";
-  import { deviceInfo, fwInfo } from "../lib/store";
+  import { battInfo, deviceInfo, fwInfo } from "../lib/store";
-  import { FW_STATUS } from "../lib/protocol/constants";
+  import { BATT_STATUS, FW_STATUS } from "../lib/protocol/constants";
   import { tooltip } from "../lib/actions/tooltip";
   import {
     CheckCircleIcon,
@@ -13,6 +13,52 @@
     BatteryFullIcon,
     BatteryChargingIcon,
   } from "phosphor-svelte";
+
+  function clampBatteryLevel(level: number): number {
+    if (Number.isNaN(level)) return 0;
+    return Math.max(0, Math.min(4, Math.trunc(level)));
+  }
+
+  $: resolvedBattIcon = (() => {
+    if (!$battInfo) return BatteryEmptyIcon;
+    if ($battInfo.battStatus === BATT_STATUS.CHARGING) return BatteryChargingIcon;
+
+    switch (clampBatteryLevel($battInfo.battLevel)) {
+      case 0:
+        return BatteryEmptyIcon;
+      case 1:
+        return BatteryLowIcon;
+      case 2:
+        return BatteryMediumIcon;
+      case 3:
+        return BatteryHighIcon;
+      default:
+        return BatteryFullIcon;
+    }
+  })();
+
+  $: battStatusText = (() => {
+    if (!$battInfo) return "unbekannt";
+    switch ($battInfo.battStatus) {
+      case BATT_STATUS.DISCHARGING:
+        return "Entladen";
+      case BATT_STATUS.FULL:
+        return "Voll";
+      case BATT_STATUS.CHARGING:
+        return "Laden";
+      case BATT_STATUS.ERROR:
+        return "Fehler";
+      default:
+        return "Unbekannt";
+    }
+  })();
+
+  $: battIconClass =
+    $battInfo?.battStatus === BATT_STATUS.ERROR
+      ? "w-5 h-5 text-red-500"
+      : $battInfo?.battStatus === BATT_STATUS.CHARGING
+        ? "w-5 h-5 text-emerald-600"
+        : "w-5 h-5";
 </script>
 
 <div class="text-sm">
@@ -127,7 +173,14 @@
       <tr>
         <td class="key">Batterie</td>
         <td class="value flex items-center gap-2">
-          85% <BatteryChargingIcon weight="bold" class="w-5 h-5" /> 1200mAh
+          {#if $battInfo}
+            <span>{$battInfo.battPercent}%</span>
+            <svelte:component this={resolvedBattIcon} weight="bold" class={battIconClass} />
+            <span class="text-text-muted">{$battInfo.battVoltageMv} mV</span>
+            <span class="text-text-muted">({battStatusText})</span>
+          {:else}
+            unbekannt
+          {/if}
         </td>
       </tr>
       <tr>

webpage/src/lib/protocol/constants.ts

@@ -27,6 +27,7 @@ export const DATA = {
     DEVICE_INFO: 0x02,
     FS_INFO: 0x03,
     FW_INFO: 0x04,
+    BATT_INFO: 0x05,
 
     FILE_GET: 0x20,
     FILE_PUT: 0x21,
@@ -66,3 +67,11 @@ export const FW_STATUS = {
     TESTING: 0x02,
     UNKNOWN: 0xFF,
 }
+
+export const BATT_STATUS = {
+    DISCHARGING: 0x00,
+    FULL: 0x01,
+    CHARGING: 0x02,
+    ERROR: 0x03,
+    UNKNOWN: 0x04,
+};

webpage/src/lib/protocol/parser.ts

@@ -1,5 +1,5 @@
 import { FRAME, DATA, ZEPHYR_ERRORS } from './constants';
-import { protocolInfo, deviceInfo, fsInfo, transferStats, fwInfo, resetTransferStats, transferDetails } from '../store';
+import { protocolInfo, deviceInfo, fsInfo, transferStats, fwInfo, battInfo, resetTransferStats, transferDetails } from '../store';
 import { addToast } from '../toast';
 import { SETTINGS } from '../settings';
 import { crc32 } from './crc32';
@@ -84,6 +84,18 @@ export function parseIncomingFrame(view: DataView, sender: FrameSender) {
                     const fwVersion = new TextDecoder().decode(new Uint8Array(view.buffer, 11, fw_version_length));
                     const kernelVersion = new TextDecoder().decode(new Uint8Array(view.buffer, 11 + fw_version_length, kernel_version_length));
                     fwInfo.set({ fwStatus, slot1Size, fwVersion, kernelVersion });
+                    break;
+                case DATA.BATT_INFO:
+                    if (payloadLength < 6) {
+                        console.warn(`Invalid BATT_INFO payload length: ${payloadLength}`);
+                        break;
+                    }
+                    const battStatus = view.getUint8(4);
+                    const battLevel = view.getUint8(5);
+                    const battPercent = view.getUint8(6);
+                    const battVoltageMv = view.getUint16(7, true);
+                    battInfo.set({ battStatus, battLevel, battPercent, battVoltageMv });
+                    break;
             }
             break;
 
@@ -365,6 +377,17 @@ export function buildFWInfoRequest(): ArrayBuffer {
     return buffer;
 }
 
+export function buildBattInfoRequest(): ArrayBuffer {
+    const buffer = new ArrayBuffer(4);
+    const view = new DataView(buffer);
+
+    view.setUint8(0, FRAME.REQUEST);
+    view.setUint16(1, 1, true);
+    view.setUint8(3, DATA.BATT_INFO);
+
+    return buffer;
+}
+
 export function buildLSRequest(path: string): ArrayBuffer {
     const encoder = new TextEncoder();
     const pathBytes = encoder.encode(path);

webpage/src/lib/settings.ts

@@ -7,6 +7,7 @@ export const SETTINGS = {
     bluetooth: {
         connectionTimeoutMs: 3000, // Timeout für den Verbindungsaufbau
         appleMaxInflight: 15, // iOS erlaubt nur wenige unbestätigte Nachrichten, daher begrenzen wir die Anzahl der gleichzeitig gesendeten Frames
+      batteryPollIntervalMs: 60_000, // Intervall für periodische BATT_INFO-Abfragen
     },
     ui: {
         toastDurationMs: 5000,

webpage/src/lib/store.ts

@@ -53,6 +53,13 @@ export interface FwInfo {
     kernelVersion: string;
 }
 
+export interface BattInfo {
+    battStatus: number;
+    battLevel: number;
+    battPercent: number;
+    battVoltageMv: number;
+}
+
 export interface StorageUsage {
     totalBytes: number;
     freeBytes: number;
@@ -84,6 +91,7 @@ export const protocolInfo = writable<ProtocolInfo | null>(null);
 export const deviceInfo = writable<DeviceInfo | null>(null);
 export const fsInfo = writable<FsInfo | null>(null);
 export const fwInfo = writable<FwInfo | null>(null);
+export const battInfo = writable<BattInfo | null>(null);
 
 // Dateilisten
 export const buzzerAudioFiles = writable<BuzzerFile[]>([]);
@@ -277,6 +285,7 @@ export function resetRemote(): void {
     deviceInfo.set(null);
     fsInfo.set(null);
     fwInfo.set(null);
+    battInfo.set(null);
     activeDeviceId.set(null);
     buzzerAudioFiles.set([]);
     buzzerSysFiles.set([]);

webpage/src/lib/sync.ts

@@ -1,6 +1,6 @@
 import { get } from 'svelte/store';
 import { isConnected, deviceInfo, fsInfo, fwInfo, buzzerAudioFiles, buzzerSysFiles, isTransferingRemote, isFetchingLocal, storageUsage, localAudioFiles, transferStats } from './store';
-import { requestProtocolInfo, requestFSInfo, fetchDirectory, getFile, putFile, deleteRemoteFile, requestDeviceInfo, requestFWInfo } from './transport';
+import { requestProtocolInfo, requestFSInfo, fetchDirectory, getFile, putFile, deleteRemoteFile, requestDeviceInfo, requestFWInfo, requestBattInfo } from './transport';
 import type { BuzzerFile } from './types';
 import { addToast } from './toast';
 import { getLocalFiles, deleteLocalFile, getLocalFile } from './db';
@@ -28,6 +28,7 @@ export async function refreshRemote() {
         await requestProtocolInfo();
         await requestFSInfo();
         await requestFWInfo();
+        await requestBattInfo();
         await requestDeviceInfo();
 
         // Kurze Verzögerung für Store-Propagation

webpage/src/lib/transport.ts

@@ -1,4 +1,4 @@
-import { buildLSRequest, buildProtocolInfoRequest, buildDeviceInfoRequest, buildFSInfoRequest, buildFWInfoRequest, setLsResolver, buildFileGetRequest, setFileGetResolver, buildTagsGetRequest, uploadState } from './protocol/parser';
+import { buildLSRequest, buildProtocolInfoRequest, buildDeviceInfoRequest, buildFSInfoRequest, buildFWInfoRequest, buildBattInfoRequest, setLsResolver, buildFileGetRequest, setFileGetResolver, buildTagsGetRequest, uploadState } from './protocol/parser';
 import { crc32 } from './protocol/crc32';
 import { get } from 'svelte/store';
 import { protocolInfo, transferStats, } from './store';
@@ -10,9 +10,45 @@ const isMac = navigator.userAgent.includes('Macintosh') || navigator.userAgent.i
 const MAX_INFLIGHT = isMac ? SETTINGS.bluetooth.appleMaxInflight : Infinity;  // iOS erlaubt nur wenige unbestätigte Nachrichten
 
 console.log("Transport: Max Inflight Frames =", MAX_INFLIGHT);
+const BATT_POLL_INTERVAL_MS = Math.max(1_000, SETTINGS.bluetooth.batteryPollIntervalMs);
 
 export type FrameSender = (buffer: ArrayBuffer) => Promise<void>;
 let currentSender: FrameSender | null = null;
+let battPollTimer: ReturnType<typeof setInterval> | null = null;
+let isBattPollInFlight = false;
+
+function stopBattPolling() {
+    if (battPollTimer) {
+        clearInterval(battPollTimer);
+        battPollTimer = null;
+    }
+}
+
+function shouldSkipBattPoll(): boolean {
+    return isListing || isFileTransferring || uploadState.active;
+}
+
+async function pollBatteryInfo() {
+    if (!currentSender || isBattPollInFlight || shouldSkipBattPoll()) {
+        return;
+    }
+
+    isBattPollInFlight = true;
+    try {
+        await requestBattInfo();
+    } catch (error) {
+        console.debug("Periodic BATT_INFO request failed:", error);
+    } finally {
+        isBattPollInFlight = false;
+    }
+}
+
+function startBattPolling() {
+    stopBattPolling();
+    battPollTimer = setInterval(() => {
+        void pollBatteryInfo();
+    }, BATT_POLL_INTERVAL_MS);
+}
 
 export function registerTransport(sender: FrameSender | null) {
     currentSender = sender;
@@ -21,6 +57,7 @@ export function registerTransport(sender: FrameSender | null) {
 // NEU: Wird von bluetooth.ts oder serial.ts nach dem physischen Connect gerufen
 export async function handleTransportConnect(sender: FrameSender) {
     registerTransport(sender);
+    stopBattPolling();
 
     try {
         // Basis-Informationen zwingend vorab laden
@@ -28,9 +65,11 @@ export async function handleTransportConnect(sender: FrameSender) {
         await requestFSInfo();
         await requestDeviceInfo();
         await requestFWInfo();
+        await requestBattInfo();
 
         // Erst wenn diese Basisdaten da sind, wird die UI freigeschaltet
         isConnected.set(true);
+        startBattPolling();
     } catch (error) {
         console.error("Transport-Initialisierung fehlgeschlagen:", error);
         handleTransportDisconnect();
@@ -58,6 +97,10 @@ export async function requestFWInfo() {
     await sendFrame(buildFWInfoRequest());
 }
 
+export async function requestBattInfo() {
+    await sendFrame(buildBattInfoRequest());
+}
+
 let isListing = false;
 
 export async function fetchDirectory(path: string): Promise<any[]> {
@@ -85,6 +128,7 @@ export async function fetchDirectory(path: string): Promise<any[]> {
 }
 
 export function handleTransportDisconnect() {
+    stopBattPolling();
     registerTransport(null);
     resetRemote();
 }