adding save and battery voltage reading

main/CMakeLists.txt

@@ -1,4 +1,4 @@
-idf_component_register(SRCS "bt_app.c" "system.c" "bubble.c" "keypad.c" "main.c"
+idf_component_register(SRCS "battery.c" "bt_app.c" "system.c" "bubble.c" "keypad.c" "main.c"
                             "gui.c"
                             "lsm6dsv.c"
                     INCLUDE_DIRS "."

main/battery.c

@@ -0,0 +1,204 @@
+#include "battery.h"
+#include "system.h"
+#include "gpio.h"
+#include "esp_log.h"
+#include "esp_adc/adc_oneshot.h"
+#include "esp_adc/adc_cali.h"
+#include "esp_adc/adc_cali_scheme.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static const char *TAG = "battery";
+
+static adc_oneshot_unit_handle_t adc1_handle = NULL;
+static adc_cali_handle_t adc1_cali_handle = NULL;
+static bool adc_calibration_enabled = false;
+
+// ADC Calibration initialization
+static bool adc_calibration_init(adc_unit_t unit, adc_channel_t channel, adc_atten_t atten, adc_cali_handle_t *out_handle)
+{
+    adc_cali_handle_t handle = NULL;
+    esp_err_t ret = ESP_FAIL;
+    bool calibrated = false;
+
+#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
+    if (!calibrated) {
+        ESP_LOGI(TAG, "Calibration scheme: Curve Fitting");
+        adc_cali_curve_fitting_config_t cali_config = {
+            .unit_id = unit,
+            .chan = channel,
+            .atten = atten,
+            .bitwidth = BATTERY_ADC_WIDTH,
+        };
+        ret = adc_cali_create_scheme_curve_fitting(&cali_config, &handle);
+        if (ret == ESP_OK) {
+            calibrated = true;
+        }
+    }
+#endif
+
+#if ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
+    if (!calibrated) {
+        ESP_LOGI(TAG, "Calibration scheme: Line Fitting");
+        adc_cali_line_fitting_config_t cali_config = {
+            .unit_id = unit,
+            .atten = atten,
+            .bitwidth = BATTERY_ADC_WIDTH,
+        };
+        ret = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
+        if (ret == ESP_OK) {
+            calibrated = true;
+        }
+    }
+#endif
+
+    *out_handle = handle;
+    if (ret == ESP_OK) {
+        ESP_LOGI(TAG, "ADC calibration successful");
+    } else {
+        ESP_LOGW(TAG, "ADC calibration failed: %s", esp_err_to_name(ret));
+    }
+    return calibrated;
+}
+
+esp_err_t battery_init(void)
+{
+    esp_err_t ret;
+
+    // Configure ADC1 oneshot mode
+    adc_oneshot_unit_init_cfg_t init_config = {
+        .unit_id = ADC_UNIT_1,
+    };
+    ret = adc_oneshot_new_unit(&init_config, &adc1_handle);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to initialize ADC unit: %s", esp_err_to_name(ret));
+        return ret;
+    }
+
+    // Configure ADC channel
+    adc_oneshot_chan_cfg_t config = {
+        .bitwidth = BATTERY_ADC_WIDTH,
+        .atten = BATTERY_ADC_ATTEN,
+    };
+    ret = adc_oneshot_config_channel(adc1_handle, BATTERY_ADC_CHANNEL, &config);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to configure ADC channel: %s", esp_err_to_name(ret));
+        return ret;
+    }
+
+    // Initialize calibration
+    adc_calibration_enabled = adc_calibration_init(ADC_UNIT_1, BATTERY_ADC_CHANNEL,
+                                                    BATTERY_ADC_ATTEN, &adc1_cali_handle);
+
+    ESP_LOGI(TAG, "Battery monitoring initialized on GPIO34 (ADC1_CH6)");
+    return ESP_OK;
+}
+
+int battery_read_raw(void)
+{
+    int adc_raw = 0;
+    esp_err_t ret = adc_oneshot_read(adc1_handle, BATTERY_ADC_CHANNEL, &adc_raw);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to read ADC: %s", esp_err_to_name(ret));
+        return -1;
+    }
+    return adc_raw;
+}
+
+int battery_read_voltage_mv(void)
+{
+    int voltage_mv = 0;
+    int adc_sum = 0;
+    int valid_samples = 0;
+
+    // Take multiple samples and average
+    for (int i = 0; i < BATTERY_SAMPLES; i++) {
+        int adc_raw = battery_read_raw();
+        if (adc_raw >= 0) {
+            adc_sum += adc_raw;
+            valid_samples++;
+        }
+        vTaskDelay(pdMS_TO_TICKS(1)); // Small delay between samples
+    }
+
+    if (valid_samples == 0) {
+        ESP_LOGE(TAG, "No valid ADC samples");
+        return -1;
+    }
+
+    int adc_avg = adc_sum / valid_samples;
+
+    // Convert to voltage using calibration if available
+    if (adc_calibration_enabled) {
+        esp_err_t ret = adc_cali_raw_to_voltage(adc1_cali_handle, adc_avg, &voltage_mv);
+        if (ret != ESP_OK) {
+            ESP_LOGW(TAG, "Calibration conversion failed, using raw calculation");
+            adc_calibration_enabled = false; // Disable for future reads
+        }
+    }
+
+    // Fallback to manual calculation if calibration not available
+    if (!adc_calibration_enabled) {
+        // Simple linear conversion for 12-bit ADC with 12dB attenuation
+        // Approximate range: 0-3300mV for 0-4095 raw values
+        voltage_mv = (adc_avg * 3300) / 4095;
+    }
+
+    // Apply voltage divider ratio to get actual battery voltage
+    voltage_mv = (int)(voltage_mv * BATTERY_VOLTAGE_DIVIDER_RATIO);
+
+    return voltage_mv;
+}
+
+int battery_get_percentage(void)
+{
+    int voltage_mv = battery_read_voltage_mv();
+
+    if (voltage_mv < 0) {
+        return -1;
+    }
+
+    // Clamp to min/max range
+    if (voltage_mv >= BATTERY_VOLTAGE_MAX) {
+        return 100;
+    }
+    if (voltage_mv <= BATTERY_VOLTAGE_MIN) {
+        return 0;
+    }
+
+    // Linear interpolation between min and max
+    int percentage = ((voltage_mv - BATTERY_VOLTAGE_MIN) * 100) /
+                     (BATTERY_VOLTAGE_MAX - BATTERY_VOLTAGE_MIN);
+
+    return percentage;
+}
+
+// Battery monitoring task
+static void battery_monitoring_task(void *pvParameters)
+{
+    ESP_LOGI(TAG, "Battery monitoring task started");
+
+    while (1) {
+        int voltage_mv = battery_read_voltage_mv();
+        int percentage = battery_get_percentage();
+
+        if (voltage_mv >= 0 && percentage >= 0) {
+            // Update system state with battery info
+            system_setBatteryVoltage(voltage_mv);
+            system_setBatteryPercentage(percentage);
+
+            ESP_LOGI(TAG, "Battery: %d mV (%d%%)", voltage_mv, percentage);
+        } else {
+            ESP_LOGW(TAG, "Failed to read battery voltage");
+        }
+
+        // Read battery every 30 seconds
+        vTaskDelay(pdMS_TO_TICKS(30000));
+    }
+}
+
+void battery_start_monitoring_task(void)
+{
+    xTaskCreate(battery_monitoring_task, "battery_task", 3072, NULL, 5, NULL);
+    ESP_LOGI(TAG, "Battery monitoring task created");
+}

main/battery.h

@@ -0,0 +1,56 @@
+#ifndef BATTERY_H
+#define BATTERY_H
+
+#include <stdint.h>
+#include "esp_err.h"
+
+// Battery monitoring configuration
+#define BATTERY_ADC_CHANNEL     ADC_CHANNEL_6   // GPIO34 (ADC1_CH6)
+#define BATTERY_ADC_ATTEN       ADC_ATTEN_DB_12 // Full range ~3.9V (0-3300mV with attenuation)
+#define BATTERY_ADC_WIDTH       ADC_WIDTH_BIT_12 // 12-bit resolution (0-4095)
+
+// Battery voltage calculation constants
+// Adjust these based on your voltage divider circuit
+#define BATTERY_VOLTAGE_DIVIDER_RATIO   2.0f    // Example: R1=R2, adjust for your circuit
+#define BATTERY_SAMPLES                 16      // Number of samples to average
+
+// Battery percentage thresholds (in millivolts at battery)
+#define BATTERY_VOLTAGE_MAX     4200    // Fully charged Li-Ion
+#define BATTERY_VOLTAGE_MIN     3000    // Empty Li-Ion (cutoff)
+
+/**
+ * @brief Initialize battery monitoring ADC
+ *
+ * @return esp_err_t ESP_OK on success
+ */
+esp_err_t battery_init(void);
+
+/**
+ * @brief Read raw ADC value from battery pin
+ *
+ * @return int Raw ADC value (0-4095)
+ */
+int battery_read_raw(void);
+
+/**
+ * @brief Read battery voltage in millivolts (averaged)
+ *
+ * @return int Battery voltage in mV
+ */
+int battery_read_voltage_mv(void);
+
+/**
+ * @brief Get battery percentage (0-100)
+ *
+ * @return int Battery percentage
+ */
+int battery_get_percentage(void);
+
+/**
+ * @brief Start battery monitoring task
+ *
+ * This task periodically reads battery voltage and updates system state
+ */
+void battery_start_monitoring_task(void);
+
+#endif // BATTERY_H

main/gui.c

@@ -1396,6 +1396,10 @@ static lv_obj_t* create_volume_page(void) {
 static void show_volume_control(void) {
     ESP_LOGI(TAG, "Showing volume control");
 
+    // Load saved volume from system
+    _current_volume = system_getVolume();
+    ESP_LOGI(TAG, "Loaded volume from system: %d", _current_volume);
+
     lv_obj_t* menu = create_menu_container();
     if (!menu) {
         ESP_LOGE(TAG, "Failed to create menu container for volume control");
@@ -1452,6 +1456,17 @@ static bool menu_stack_is_empty(void) {
 static void menu_go_back(void) {
     ESP_LOGI(TAG, "Menu go back requested");
 
+    // Save volume if exiting from volume page
+    if (_currentPage == _volume_page) {
+        system_setVolume(_current_volume);
+        esp_err_t ret = system_saveVolume();
+        if (ret == ESP_OK) {
+            ESP_LOGI(TAG, "Volume %d saved when exiting volume menu", _current_volume);
+        } else {
+            ESP_LOGE(TAG, "Failed to save volume: %s", esp_err_to_name(ret));
+        }
+    }
+
     if (menu_stack_is_empty()) {
         ESP_LOGI(TAG, "Menu stack empty, returning to bubble mode");
         _mode = GUI_BUBBLE;
@@ -1497,6 +1512,7 @@ static void update_volume_display(int volume) {
         UNLOCK();
 
         _current_volume = volume;
+        system_setVolume(volume);  // Update system state in real-time
         ESP_LOGI(TAG, "Volume display updated to %d%%", volume);
     }
 }

main/main.c

@@ -28,6 +28,7 @@
 #include "gpio.h"
 #include "keypad.h"
 #include "system.h"
+#include "battery.h"
 
 
 
@@ -313,6 +314,11 @@ void app_main(void)
     bt_app_init();
     print_heap_info("POST_BLUETOOTH");
 
+    // Initialize battery monitoring
+    ESP_ERROR_CHECK(battery_init());
+    battery_start_monitoring_task();
+    print_heap_info("POST_BATTERY");
+
     gpio_set_level(PIN_NUM_LED_0, 1);
             gpio_set_level(PIN_NUM_LED_1, 1);
             gpio_set_level(PIN_NUM_LED_2, 1);

main/system.c

@@ -13,6 +13,8 @@ static EventManager_t _eventManager;
 static QueueHandle_t _nvsRequestQueue;
 static const char* NVS_NAMESPACE = "bt_devices";
 static const char* NVS_KEY_COUNT = "count";
+static const char* NVS_NAMESPACE_SETTINGS = "settings";
+static const char* NVS_KEY_VOLUME = "volume";
 
 static esp_err_t nvs_load_devices_internal(paired_device_t *devices, size_t *count);
 static esp_err_t nvs_save_devices_internal(const paired_device_t *devices, size_t count);
@@ -24,6 +26,9 @@ void system_init(void)
     _systemState.pairedDeviceCount = 0;
     _systemState.isCharging = false;
     _systemState.swapLR = false;
+    _systemState.volume = 50;  // Default volume
+    _systemState.batteryVoltage_mv = 0;
+    _systemState.batteryPercentage = 0;
 
 	_systemEvent = xEventGroupCreate();
 
@@ -31,6 +36,9 @@ void system_init(void)
     _eventManager.mutex = xSemaphoreCreateMutex();
 
     system_initNvsService();
+
+    // Load saved volume from NVS
+    system_loadVolume();
 }
 
 int system_getPrimaryAxis(void)
@@ -75,6 +83,38 @@ bool system_getChargeStatus(void)
     return charging;
 }
 
+void system_setBatteryVoltage(int voltage_mv)
+{
+    xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
+    _systemState.batteryVoltage_mv = voltage_mv;
+    xSemaphoreGive(_eventManager.mutex);
+}
+
+int system_getBatteryVoltage(void)
+{
+    int voltage;
+    xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
+    voltage = _systemState.batteryVoltage_mv;
+    xSemaphoreGive(_eventManager.mutex);
+    return voltage;
+}
+
+void system_setBatteryPercentage(int percentage)
+{
+    xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
+    _systemState.batteryPercentage = percentage;
+    xSemaphoreGive(_eventManager.mutex);
+}
+
+int system_getBatteryPercentage(void)
+{
+    int percentage;
+    xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
+    percentage = _systemState.batteryPercentage;
+    xSemaphoreGive(_eventManager.mutex);
+    return percentage;
+}
+
 void system_setSwapLR(bool swap)
 {
     xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
@@ -257,6 +297,85 @@ void system_requestVolumeDown(void) {
     system_notifyAll(EM_EVENT_VOLUME_DOWN);
 }
 
+void system_setVolume(int volume) {
+    if (volume < 0) volume = 0;
+    if (volume > 100) volume = 100;
+
+    xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
+    _systemState.volume = volume;
+    xSemaphoreGive(_eventManager.mutex);
+
+    ESP_LOGI("system", "Volume set to %d", volume);
+}
+
+int system_getVolume(void) {
+    int volume;
+    xSemaphoreTake(_eventManager.mutex, portMAX_DELAY);
+    volume = _systemState.volume;
+    xSemaphoreGive(_eventManager.mutex);
+    return volume;
+}
+
+esp_err_t system_saveVolume(void) {
+    nvs_handle_t nvs_handle;
+    esp_err_t ret;
+
+    int volume = system_getVolume();
+
+    ret = nvs_open(NVS_NAMESPACE_SETTINGS, NVS_READWRITE, &nvs_handle);
+    if (ret != ESP_OK) {
+        ESP_LOGE("system", "Failed to open NVS namespace for volume write: %s", esp_err_to_name(ret));
+        return ret;
+    }
+
+    ret = nvs_set_i32(nvs_handle, NVS_KEY_VOLUME, volume);
+    if (ret != ESP_OK) {
+        ESP_LOGE("system", "Failed to write volume to NVS: %s", esp_err_to_name(ret));
+        nvs_close(nvs_handle);
+        return ret;
+    }
+
+    ret = nvs_commit(nvs_handle);
+    nvs_close(nvs_handle);
+
+    if (ret == ESP_OK) {
+        ESP_LOGI("system", "Volume %d saved to NVS", volume);
+    } else {
+        ESP_LOGE("system", "Failed to commit volume to NVS: %s", esp_err_to_name(ret));
+    }
+
+    return ret;
+}
+
+esp_err_t system_loadVolume(void) {
+    nvs_handle_t nvs_handle;
+    esp_err_t ret;
+    int32_t volume = 50;  // Default value
+
+    ret = nvs_open(NVS_NAMESPACE_SETTINGS, NVS_READONLY, &nvs_handle);
+    if (ret != ESP_OK) {
+        ESP_LOGI("system", "No saved volume found, using default: %d", volume);
+        system_setVolume(volume);
+        return ESP_OK;  // Not an error, just means no saved value
+    }
+
+    ret = nvs_get_i32(nvs_handle, NVS_KEY_VOLUME, &volume);
+    nvs_close(nvs_handle);
+
+    if (ret == ESP_OK) {
+        ESP_LOGI("system", "Loaded volume from NVS: %d", volume);
+        system_setVolume(volume);
+    } else if (ret == ESP_ERR_NVS_NOT_FOUND) {
+        ESP_LOGI("system", "No saved volume found, using default: %d", volume);
+        system_setVolume(volume);
+        ret = ESP_OK;  // Not an error
+    } else {
+        ESP_LOGE("system", "Failed to read volume from NVS: %s", esp_err_to_name(ret));
+    }
+
+    return ret;
+}
+
 void system_initNvsService(void) {
     _nvsRequestQueue = xQueueCreate(10, sizeof(nvs_request_t));
     if (_nvsRequestQueue == NULL) {

main/system.h

@@ -58,6 +58,13 @@ typedef struct SystemState_s
     // Swap L/R audio channels
     bool swapLR;
 
+    // Volume setting (0-100)
+    int volume;
+
+    // Battery monitoring
+    int batteryVoltage_mv;
+    int batteryPercentage;
+
 } SystemState_t;
 
 
@@ -93,6 +100,11 @@ float system_getAngle(void);
 void system_setChargeStatus(bool charging);
 bool system_getChargeStatus(void);
 
+void system_setBatteryVoltage(int voltage_mv);
+int system_getBatteryVoltage(void);
+void system_setBatteryPercentage(int percentage);
+int system_getBatteryPercentage(void);
+
 void system_setSwapLR(bool swap);
 bool system_getSwapLR(void);
 void system_toggleSwapLR(void);
@@ -118,6 +130,10 @@ int system_getBtDeviceIndex(void);
 // Volume control functions
 void system_requestVolumeUp(void);
 void system_requestVolumeDown(void);
+void system_setVolume(int volume);
+int system_getVolume(void);
+esp_err_t system_saveVolume(void);
+esp_err_t system_loadVolume(void);
 
 // NVS Service
 typedef enum {